Google Git
Sign in
pigweed / third_party / github / h2o / picotls / refs/heads/main / . / lib / fusion.c
blob: 35fe5795c8335be8038abc578d0a6dcb5c089493 [file] [log] [blame]
/*
* This source file is licensed under the Apache License 2.0 *and* the MIT
* License. Please agree to *both* of the licensing terms!
*
*
* `transformH` function is a derivative work of OpenSSL. The original work
* is covered by the following license:
*
* Copyright 2013-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*
*
* All other work, including modifications to the `transformH` function is
* covered by the following MIT license:
*
* Copyright (c) 2020-2022 Fastly, Kazuho Oku
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <immintrin.h>
#include <tmmintrin.h>
#include <nmmintrin.h>
#include <wmmintrin.h>
#include "picotls.h"
#include "picotls/fusion.h"
#if defined(__clang__)
#if __has_feature(address_sanitizer)
#define NO_SANITIZE_ADDRESS __attribute__((no_sanitize("address")))
#endif
#elif __SANITIZE_ADDRESS__ /* gcc */
#define NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
#endif
#ifndef NO_SANITIZE_ADDRESS
#define NO_SANITIZE_ADDRESS
#endif
#ifdef _WINDOWS
#define aligned_alloc(a, s) _aligned_malloc((s), (a))
#define aligned_free(p) _aligned_free(p)
#else
#define aligned_free(p) free(p)
#endif
struct ptls_fusion_aesgcm_context {
ptls_fusion_aesecb_context_t ecb;
size_t capacity;
size_t ghash_cnt;
};
struct ptls_fusion_aesgcm_context128 {
struct ptls_fusion_aesgcm_context super;
struct ptls_fusion_aesgcm_ghash_precompute128 {
__m128i H;
__m128i r;
} ghash[0];
};
struct ptls_fusion_aesgcm_context256 {
struct ptls_fusion_aesgcm_context super;
union ptls_fusion_aesgcm_ghash_precompute256 {
struct {
__m128i H[2];
__m128i r[2];
};
struct {
__m256i Hx2;
__m256i rx2;
};
} ghash[0];
};
struct ctr_context {
ptls_cipher_context_t super;
ptls_fusion_aesecb_context_t fusion;
__m128i bits;
uint8_t is_ready;
};
struct aesgcm_context {
ptls_aead_context_t super;
ptls_fusion_aesgcm_context_t *aesgcm;
/**
* retains the static IV in the upper 96 bits (in little endian)
*/
__m128i static_iv;
};
static const uint64_t poly_[2] __attribute__((aligned(16))) = {1, 0xc200000000000000};
#define poly (*(__m128i *)poly_)
static const uint8_t byteswap_[32] __attribute__((aligned(32))) = {15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0};
#define byteswap128 (*(__m128i *)byteswap_)
#define byteswap256 (*(__m256i *)byteswap_)
static const uint8_t one_[16] __attribute__((aligned(16))) = {1};
#define one8 (*(__m128i *)one_)
static const uint8_t incr128x2_[32] __attribute__((aligned(32))) = {2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2};
#define incr128x2 (*(__m256i *)incr128x2_)
/* This function is covered by the Apache License and the MIT License. The origin is crypto/modes/asm/ghash-x86_64.pl of openssl
* at commit 33388b4. */
static __m128i transformH(__m128i H)
{
// # <<1 twist
// pshufd \$0b11111111,$Hkey,$T2 # broadcast uppermost dword
__m128i t2 = _mm_shuffle_epi32(H, 0xff);
// movdqa $Hkey,$T1
__m128i t1 = H;
// psllq \$1,$Hkey
H = _mm_slli_epi64(H, 1);
// pxor $T3,$T3 #
__m128i t3 = _mm_setzero_si128();
// psrlq \$63,$T1
t1 = _mm_srli_epi64(t1, 63);
// pcmpgtd $T2,$T3 # broadcast carry bit
t3 = _mm_cmplt_epi32(t2, t3);
// pslldq \$8,$T1
t1 = _mm_slli_si128(t1, 8);
// por $T1,$Hkey # H<<=1
H = _mm_or_si128(t1, H);
// # magic reduction
// pand .L0x1c2_polynomial(%rip),$T3
t3 = _mm_and_si128(t3, poly);
// pxor $T3,$Hkey # if(carry) H^=0x1c2_polynomial
H = _mm_xor_si128(t3, H);
return H;
}
// end of Apache License code
static __m128i gfmul(__m128i x, __m128i y)
{
__m128i lo = _mm_clmulepi64_si128(x, y, 0x00);
__m128i hi = _mm_clmulepi64_si128(x, y, 0x11);
__m128i a = _mm_shuffle_epi32(x, 78);
__m128i b = _mm_shuffle_epi32(y, 78);
a = _mm_xor_si128(a, x);
b = _mm_xor_si128(b, y);
a = _mm_clmulepi64_si128(a, b, 0x00);
a = _mm_xor_si128(a, lo);
a = _mm_xor_si128(a, hi);
b = _mm_slli_si128(a, 8);
a = _mm_srli_si128(a, 8);
lo = _mm_xor_si128(lo, b);
hi = _mm_xor_si128(hi, a);
// from https://crypto.stanford.edu/RealWorldCrypto/slides/gueron.pdf
__m128i t = _mm_clmulepi64_si128(lo, poly, 0x10);
lo = _mm_shuffle_epi32(lo, 78);
lo = _mm_xor_si128(lo, t);
t = _mm_clmulepi64_si128(lo, poly, 0x10);
lo = _mm_shuffle_epi32(lo, 78);
lo = _mm_xor_si128(lo, t);
return _mm_xor_si128(hi, lo);
}
static inline __m128i gfmul_do_reduce(__m128i hi, __m128i lo, __m128i mid)
{
mid = _mm_xor_si128(mid, hi);
mid = _mm_xor_si128(mid, lo);
lo = _mm_xor_si128(lo, _mm_slli_si128(mid, 8));
hi = _mm_xor_si128(hi, _mm_srli_si128(mid, 8));
/* fast reduction, using https://crypto.stanford.edu/RealWorldCrypto/slides/gueron.pdf */
__m128i r = _mm_clmulepi64_si128(lo, poly, 0x10);
lo = _mm_shuffle_epi32(lo, 78);
lo = _mm_xor_si128(lo, r);
r = _mm_clmulepi64_si128(lo, poly, 0x10);
lo = _mm_shuffle_epi32(lo, 78);
lo = _mm_xor_si128(lo, r);
lo = _mm_xor_si128(hi, lo);
return lo;
}
struct ptls_fusion_gfmul_state128 {
__m128i hi, lo, mid;
};
#if defined(__GNUC__) && !defined(__clang__)
static inline __m128i xor128(__m128i x, __m128i y)
{
__m128i ret;
__asm__("vpxor %2, %1, %0" : "=x"(ret) : "x"(x), "xm"(y));
return ret;
}
#else
#define xor128 _mm_xor_si128
#endif
static inline void gfmul_do_step128(struct ptls_fusion_gfmul_state128 *gstate, __m128i X,
struct ptls_fusion_aesgcm_ghash_precompute128 *precompute)
{
__m128i t1 = _mm_clmulepi64_si128(precompute->H, X, 0x00);
__m128i t2 = _mm_clmulepi64_si128(precompute->H, X, 0x11);
__m128i t3 = _mm_shuffle_epi32(X, 78);
t3 = _mm_xor_si128(t3, X);
t3 = _mm_clmulepi64_si128(precompute->r, t3, 0x00);
gstate->lo = xor128(gstate->lo, t1);
gstate->hi = xor128(gstate->hi, t2);
gstate->mid = xor128(gstate->mid, t3);
}
#undef xor128
static inline void gfmul_firststep128(struct ptls_fusion_gfmul_state128 *gstate, __m128i X,
struct ptls_fusion_aesgcm_ghash_precompute128 *precompute)
{
X = _mm_shuffle_epi8(X, byteswap128);
X = _mm_xor_si128(gstate->lo, X);
gstate->lo = _mm_setzero_si128();
gstate->hi = _mm_setzero_si128();
gstate->mid = _mm_setzero_si128();
gfmul_do_step128(gstate, X, precompute);
}
static inline void gfmul_nextstep128(struct ptls_fusion_gfmul_state128 *gstate, __m128i X,
struct ptls_fusion_aesgcm_ghash_precompute128 *precompute)
{
X = _mm_shuffle_epi8(X, byteswap128);
gfmul_do_step128(gstate, X, precompute);
}
static inline void gfmul_reduce128(struct ptls_fusion_gfmul_state128 *gstate)
{
gstate->lo = gfmul_do_reduce(gstate->hi, gstate->lo, gstate->mid);
}
static inline __m128i gfmul_get_tag128(struct ptls_fusion_gfmul_state128 *gstate, __m128i ek0)
{
__m128i tag = _mm_shuffle_epi8(gstate->lo, byteswap128);
tag = _mm_xor_si128(tag, ek0);
return tag;
}
struct ptls_fusion_gfmul_state256 {
__m256i hi, lo, mid;
};
static inline void gfmul_do_step256(struct ptls_fusion_gfmul_state256 *gstate, __m256i X,
union ptls_fusion_aesgcm_ghash_precompute256 *precompute)
{
__m256i t = _mm256_clmulepi64_epi128(precompute->Hx2, X, 0x00);
gstate->lo = _mm256_xor_si256(gstate->lo, t);
t = _mm256_clmulepi64_epi128(precompute->Hx2, X, 0x11);
gstate->hi = _mm256_xor_si256(gstate->hi, t);
t = _mm256_shuffle_epi32(X, 78);
t = _mm256_xor_si256(t, X);
t = _mm256_clmulepi64_epi128(precompute->rx2, t, 0x00);
gstate->mid = _mm256_xor_si256(gstate->mid, t);
}
static inline void gfmul_firststep256(struct ptls_fusion_gfmul_state256 *gstate, __m256i X, int half,
union ptls_fusion_aesgcm_ghash_precompute256 *precompute)
{
X = _mm256_shuffle_epi8(X, byteswap256);
X = _mm256_xor_si256(gstate->lo, X);
if (half)
X = _mm256_permute2f128_si256(X, X, 0x08);
gstate->lo = _mm256_setzero_si256();
gstate->hi = _mm256_setzero_si256();
gstate->mid = _mm256_setzero_si256();
gfmul_do_step256(gstate, X, precompute);
}
static inline void gfmul_nextstep256(struct ptls_fusion_gfmul_state256 *gstate, __m256i X,
union ptls_fusion_aesgcm_ghash_precompute256 *precompute)
{
X = _mm256_shuffle_epi8(X, byteswap256);
gfmul_do_step256(gstate, X, precompute);
}
static inline void gfmul_reduce256(struct ptls_fusion_gfmul_state256 *gstate)
{
#define XOR_256TO128(y) _mm_xor_si128(_mm256_castsi256_si128(y), _mm256_extractf128_si256((y), 1))
__m128i hi = XOR_256TO128(gstate->hi);
__m128i lo = XOR_256TO128(gstate->lo);
__m128i mid = XOR_256TO128(gstate->mid);
#undef XOR_256TO128
lo = gfmul_do_reduce(hi, lo, mid);
gstate->lo = _mm256_castsi128_si256(lo);
}
static inline __m128i gfmul_get_tag256(struct ptls_fusion_gfmul_state256 *gstate, __m128i ek0)
{
__m128i tag = _mm_shuffle_epi8(_mm256_castsi256_si128(gstate->lo), byteswap128);
tag = _mm_xor_si128(tag, ek0);
return tag;
}
static inline __m128i aesecb_encrypt(ptls_fusion_aesecb_context_t *ctx, __m128i v)
{
#define ROUNDKEY(i) (ctx->aesni256 ? _mm256_castsi256_si128(ctx->keys.m256[i]) : ctx->keys.m128[i])
v = _mm_xor_si128(v, ROUNDKEY(0));
for (size_t i = 1; i < ctx->rounds; ++i)
v = _mm_aesenc_si128(v, ROUNDKEY(i));
v = _mm_aesenclast_si128(v, ROUNDKEY(ctx->rounds));
return v;
#undef ROUNDKEY
}
// 32-bytes of 0xff followed by 31-bytes of 0x00
static const uint8_t loadn_mask[63] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static const uint8_t loadn_shuffle[31] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, // first 16 bytes map to byte offsets
0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80}; // latter 15 bytes map to zero
NO_SANITIZE_ADDRESS
static inline __m128i loadn_end_of_page(const void *p, size_t l)
{
uintptr_t shift = (uintptr_t)p & 15;
__m128i pattern = _mm_loadu_si128((const __m128i *)(loadn_shuffle + shift));
return _mm_shuffle_epi8(_mm_load_si128((const __m128i *)((uintptr_t)p - shift)), pattern);
}
NO_SANITIZE_ADDRESS
static inline __m128i loadn128(const void *p, size_t l)
{
__m128i v, mask = _mm_loadu_si128((__m128i *)(loadn_mask + 32 - l));
uintptr_t mod4k = (uintptr_t)p % 4096;
if (PTLS_LIKELY(mod4k <= 4096 - 16) || mod4k + l > 4096) {
v = _mm_loadu_si128(p);
} else {
v = loadn_end_of_page(p, l);
}
v = _mm_and_si128(v, mask);
return v;
}
NO_SANITIZE_ADDRESS
static inline __m256i loadn256(const void *p, size_t l)
{
__m256i v, mask = _mm256_loadu_si256((__m256i *)(loadn_mask + 32 - l));
uintptr_t mod4k = (uintptr_t)p % 4096;
if (PTLS_LIKELY(mod4k < 4096 - 32) || mod4k + l > 4096) {
v = _mm256_loadu_si256(p);
} else if (l > 16) {
__m128i first16 = _mm_loadu_si128(p), second16 = loadn128((uint8_t *)p + 16, l - 16);
v = _mm256_permute2f128_si256(_mm256_castsi128_si256(first16), _mm256_castsi128_si256(second16), 0x20);
} else if (l == 16) {
v = _mm256_castsi128_si256(_mm_loadu_si128(p));
} else {
v = _mm256_castsi128_si256(loadn_end_of_page(p, l));
}
v = _mm256_and_si256(v, mask);
return v;
}
static inline void storen128(void *_p, size_t l, __m128i v)
{
uint8_t buf[16], *p = _p;
*(__m128i *)buf = v;
for (size_t i = 0; i != l; ++i)
p[i] = buf[i];
}
void ptls_fusion_aesgcm_encrypt(ptls_fusion_aesgcm_context_t *_ctx, void *output, const void *input, size_t inlen, __m128i ctr,
const void *_aad, size_t aadlen, ptls_aead_supplementary_encryption_t *supp)
{
/* init the bits (we can always run in full), but use the last slot for calculating ek0, if possible */
#define AESECB6_INIT() \
do { \
ctr = _mm_add_epi64(ctr, one8); \
bits0 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits1 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits2 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits3 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits4 = _mm_shuffle_epi8(ctr, byteswap128); \
if (PTLS_LIKELY(srclen > 16 * 5)) { \
ctr = _mm_add_epi64(ctr, one8); \
bits5 = _mm_shuffle_epi8(ctr, byteswap128); \
} else { \
if ((state & STATE_EK0_BEEN_FED) == 0) { \
bits5 = ek0; \
state |= STATE_EK0_BEEN_FED; \
} \
if ((state & STATE_SUPP_USED) != 0 && srclen <= 16 * 4 && (const __m128i *)supp->input + 1 <= dst_ghash) { \
bits4 = _mm_loadu_si128(supp->input); \
bits4keys = ((struct ctr_context *)supp->ctx)->fusion.keys.m128; \
state |= STATE_SUPP_IN_PROCESS; \
} \
} \
__m128i k = ctx->super.ecb.keys.m128[0]; \
bits0 = _mm_xor_si128(bits0, k); \
bits1 = _mm_xor_si128(bits1, k); \
bits2 = _mm_xor_si128(bits2, k); \
bits3 = _mm_xor_si128(bits3, k); \
bits4 = _mm_xor_si128(bits4, bits4keys[0]); \
bits5 = _mm_xor_si128(bits5, k); \
} while (0)
/* aes block update */
#define AESECB6_UPDATE(i) \
do { \
__m128i k = ctx->super.ecb.keys.m128[i]; \
bits0 = _mm_aesenc_si128(bits0, k); \
bits1 = _mm_aesenc_si128(bits1, k); \
bits2 = _mm_aesenc_si128(bits2, k); \
bits3 = _mm_aesenc_si128(bits3, k); \
bits4 = _mm_aesenc_si128(bits4, bits4keys[i]); \
bits5 = _mm_aesenc_si128(bits5, k); \
} while (0)
/* aesenclast */
#define AESECB6_FINAL(i) \
do { \
__m128i k = ctx->super.ecb.keys.m128[i]; \
bits0 = _mm_aesenclast_si128(bits0, k); \
bits1 = _mm_aesenclast_si128(bits1, k); \
bits2 = _mm_aesenclast_si128(bits2, k); \
bits3 = _mm_aesenclast_si128(bits3, k); \
bits4 = _mm_aesenclast_si128(bits4, bits4keys[i]); \
bits5 = _mm_aesenclast_si128(bits5, k); \
} while (0)
struct ptls_fusion_aesgcm_context128 *ctx = (void *)_ctx;
__m128i ek0, bits0, bits1, bits2, bits3, bits4, bits5 = _mm_setzero_si128();
const __m128i *bits4keys = ctx->super.ecb.keys.m128; /* is changed to supp->ctx.keys when calcurating suppout */
struct ptls_fusion_gfmul_state128 gstate = {0};
__m128i gdatabuf[6];
__m128i ac = _mm_shuffle_epi8(_mm_set_epi32(0, (int)aadlen * 8, 0, (int)inlen * 8), byteswap128);
// src and dst are updated after the chunk is processed
const __m128i *src = input;
__m128i *dst = output;
size_t srclen = inlen;
// aad and src_ghash are updated before the chunk is processed (i.e., when the pointers are fed indo the processor)
const __m128i *aad = _aad, *dst_ghash = dst;
size_t dst_ghashlen = srclen;
struct ptls_fusion_aesgcm_ghash_precompute128 *ghash_precompute = ctx->ghash + (aadlen + 15) / 16 + (srclen + 15) / 16 + 1;
#define STATE_EK0_BEEN_FED 0x3
#define STATE_EK0_INCOMPLETE 0x2
#define STATE_EK0_READY() ((state & STATE_EK0_BEEN_FED) == 0x1)
#define STATE_SUPP_USED 0x4
#define STATE_SUPP_IN_PROCESS 0x8
int32_t state = supp != NULL ? STATE_SUPP_USED : 0;
/* build counter */
ctr = _mm_insert_epi32(ctr, 1, 0);
ek0 = _mm_shuffle_epi8(ctr, byteswap128);
/* start preparing AES */
AESECB6_INIT();
AESECB6_UPDATE(1);
/* build first ghash data (only AAD can be fed at this point, as this would be calculated alongside the first AES block) */
const __m128i *gdata = gdatabuf; // points to the elements fed into GHASH
size_t gdata_cnt = 0;
if (PTLS_LIKELY(aadlen != 0)) {
while (gdata_cnt < 6) {
if (PTLS_LIKELY(aadlen < 16)) {
if (aadlen != 0) {
gdatabuf[gdata_cnt++] = loadn128(aad, aadlen);
aadlen = 0;
}
goto MainLoop;
}
gdatabuf[gdata_cnt++] = _mm_loadu_si128(aad++);
aadlen -= 16;
}
}
/* the main loop */
MainLoop:
while (1) {
/* run AES and multiplication in parallel */
size_t i;
for (i = 2; i < gdata_cnt + 2; ++i) {
AESECB6_UPDATE(i);
gfmul_nextstep128(&gstate, _mm_loadu_si128(gdata++), --ghash_precompute);
}
for (; i < ctx->super.ecb.rounds; ++i)
AESECB6_UPDATE(i);
AESECB6_FINAL(i);
/* apply the bit stream to src and write to dest */
if (PTLS_LIKELY(srclen >= 6 * 16)) {
#define APPLY(i) _mm_storeu_si128(dst + i, _mm_xor_si128(_mm_loadu_si128(src + i), bits##i))
APPLY(0);
APPLY(1);
APPLY(2);
APPLY(3);
APPLY(4);
APPLY(5);
#undef APPLY
dst += 6;
src += 6;
srclen -= 6 * 16;
} else {
if ((state & STATE_EK0_BEEN_FED) == STATE_EK0_BEEN_FED) {
ek0 = bits5;
state &= ~STATE_EK0_INCOMPLETE;
}
if ((state & STATE_SUPP_IN_PROCESS) != 0) {
_mm_storeu_si128((__m128i *)supp->output, bits4);
state &= ~(STATE_SUPP_USED | STATE_SUPP_IN_PROCESS);
}
if (srclen != 0) {
#define APPLY(i) \
do { \
if (PTLS_LIKELY(srclen >= 16)) { \
_mm_storeu_si128(dst++, _mm_xor_si128(_mm_loadu_si128(src++), bits##i)); \
srclen -= 16; \
} else if (PTLS_LIKELY(srclen != 0)) { \
bits0 = bits##i; \
goto ApplyRemainder; \
} else { \
goto ApplyEnd; \
} \
} while (0)
APPLY(0);
APPLY(1);
APPLY(2);
APPLY(3);
APPLY(4);
APPLY(5);
#undef APPLY
goto ApplyEnd;
ApplyRemainder:
storen128(dst, srclen, _mm_xor_si128(loadn128(src, srclen), bits0));
dst = (__m128i *)((uint8_t *)dst + srclen);
srclen = 0;
ApplyEnd:;
}
}
/* next block AES starts here */
AESECB6_INIT();
AESECB6_UPDATE(1);
/* setup gdata */
if (PTLS_UNLIKELY(aadlen != 0)) {
gdata_cnt = 0;
while (gdata_cnt < 6) {
if (aadlen < 16) {
if (aadlen != 0) {
gdatabuf[gdata_cnt++] = loadn128(aad, aadlen);
aadlen = 0;
}
goto GdataFillDST;
}
gdatabuf[gdata_cnt++] = _mm_loadu_si128(aad++);
aadlen -= 16;
}
gdata = gdatabuf;
} else if (PTLS_LIKELY(dst_ghashlen >= 6 * 16)) {
gdata = dst_ghash;
gdata_cnt = 6;
dst_ghash += 6;
dst_ghashlen -= 96;
} else {
gdata_cnt = 0;
GdataFillDST:
while (gdata_cnt < 6) {
if (dst_ghashlen < 16) {
if (dst_ghashlen != 0) {
gdatabuf[gdata_cnt++] = loadn128(dst_ghash, dst_ghashlen);
dst_ghashlen = 0;
}
if (gdata_cnt < 6)
goto Finish;
break;
}
gdatabuf[gdata_cnt++] = _mm_loadu_si128(dst_ghash++);
dst_ghashlen -= 16;
}
gdata = gdatabuf;
}
}
Finish:
gdatabuf[gdata_cnt++] = ac;
/* We have complete set of data to be fed into GHASH. Let's finish the remaining calculation.
* Note that by now, all AES operations for payload encryption and ek0 are complete. This is is because it is necessary for GCM
* to process at least the same amount of data (i.e. payload-blocks + AC), and because AES is at least one 96-byte block ahead.
*/
assert(STATE_EK0_READY());
for (size_t i = 0; i < gdata_cnt; ++i)
gfmul_nextstep128(&gstate, gdatabuf[i], --ghash_precompute);
gfmul_reduce128(&gstate);
_mm_storeu_si128(dst, gfmul_get_tag128(&gstate, ek0));
/* Finish the calculation of supplemental vector. Done at the very last, because the sample might cover the GCM tag. */
if ((state & STATE_SUPP_USED) != 0) {
size_t i;
if ((state & STATE_SUPP_IN_PROCESS) == 0) {
bits4keys = ((struct ctr_context *)supp->ctx)->fusion.keys.m128;
bits4 = _mm_xor_si128(_mm_loadu_si128(supp->input), bits4keys[0]);
i = 1;
} else {
i = 2;
}
do {
bits4 = _mm_aesenc_si128(bits4, bits4keys[i++]);
} while (i != ctx->super.ecb.rounds);
bits4 = _mm_aesenclast_si128(bits4, bits4keys[i]);
_mm_storeu_si128((__m128i *)supp->output, bits4);
}
#undef AESECB6_INIT
#undef AESECB6_UPDATE
#undef AESECB6_FINAL
#undef STATE_EK0_BEEN_FOUND
#undef STATE_EK0_READY
#undef STATE_SUPP_IN_PROCESS
}
int ptls_fusion_aesgcm_decrypt(ptls_fusion_aesgcm_context_t *_ctx, void *output, const void *input, size_t inlen, __m128i ctr,
const void *_aad, size_t aadlen, const void *tag)
{
struct ptls_fusion_aesgcm_context128 *ctx = (void *)_ctx;
__m128i ek0 = _mm_setzero_si128(), bits0, bits1 = _mm_setzero_si128(), bits2 = _mm_setzero_si128(), bits3 = _mm_setzero_si128(),
bits4 = _mm_setzero_si128(), bits5 = _mm_setzero_si128();
struct ptls_fusion_gfmul_state128 gstate = {0};
__m128i gdatabuf[6];
__m128i ac = _mm_shuffle_epi8(_mm_set_epi32(0, (int)aadlen * 8, 0, (int)inlen * 8), byteswap128);
struct ptls_fusion_aesgcm_ghash_precompute128 *ghash_precompute = ctx->ghash + (aadlen + 15) / 16 + (inlen + 15) / 16 + 1;
const __m128i *gdata; // points to the elements fed into GHASH
size_t gdata_cnt;
const __m128i *src_ghash = input, *src_aes = input, *aad = _aad;
__m128i *dst = output;
size_t nondata_aes_cnt = 0, src_ghashlen = inlen, src_aeslen = inlen;
/* schedule ek0 and suppkey */
ctr = _mm_add_epi64(ctr, one8);
bits0 = _mm_xor_si128(_mm_shuffle_epi8(ctr, byteswap128), ctx->super.ecb.keys.m128[0]);
++nondata_aes_cnt;
#define STATE_IS_FIRST_RUN 0x1
#define STATE_GHASH_HAS_MORE 0x2
int state = STATE_IS_FIRST_RUN | STATE_GHASH_HAS_MORE;
/* the main loop */
while (1) {
/* setup gdata */
if (PTLS_UNLIKELY(aadlen != 0)) {
gdata = gdatabuf;
gdata_cnt = 0;
while (gdata_cnt < 6) {
if (aadlen < 16) {
if (aadlen != 0) {
gdatabuf[gdata_cnt++] = loadn128(aad, aadlen);
aadlen = 0;
++nondata_aes_cnt;
}
goto GdataFillSrc;
}
gdatabuf[gdata_cnt++] = _mm_loadu_si128(aad++);
aadlen -= 16;
++nondata_aes_cnt;
}
} else if (PTLS_LIKELY(src_ghashlen >= 6 * 16)) {
gdata = src_ghash;
gdata_cnt = 6;
src_ghash += 6;
src_ghashlen -= 6 * 16;
} else {
gdata = gdatabuf;
gdata_cnt = 0;
GdataFillSrc:
while (gdata_cnt < 6) {
if (src_ghashlen < 16) {
if (src_ghashlen != 0) {
gdatabuf[gdata_cnt++] = loadn128(src_ghash, src_ghashlen);
src_ghash = (__m128i *)((uint8_t *)src_ghash + src_ghashlen);
src_ghashlen = 0;
}
if (gdata_cnt < 6 && (state & STATE_GHASH_HAS_MORE) != 0) {
gdatabuf[gdata_cnt++] = ac;
state &= ~STATE_GHASH_HAS_MORE;
}
break;
}
gdatabuf[gdata_cnt++] = _mm_loadu_si128(src_ghash++);
src_ghashlen -= 16;
}
}
/* setup aes bits */
if (PTLS_LIKELY(nondata_aes_cnt == 0))
goto InitAllBits;
switch (nondata_aes_cnt) {
#define INIT_BITS(n, keys) \
case n: \
ctr = _mm_add_epi64(ctr, one8); \
bits##n = _mm_xor_si128(_mm_shuffle_epi8(ctr, byteswap128), keys.m128[0]);
InitAllBits:
INIT_BITS(0, ctx->super.ecb.keys);
INIT_BITS(1, ctx->super.ecb.keys);
INIT_BITS(2, ctx->super.ecb.keys);
INIT_BITS(3, ctx->super.ecb.keys);
INIT_BITS(4, ctx->super.ecb.keys);
INIT_BITS(5, ctx->super.ecb.keys);
#undef INIT_BITS
}
{ /* run aes and ghash */
#define AESECB6_UPDATE(i) \
do { \
__m128i k = ctx->super.ecb.keys.m128[i]; \
bits0 = _mm_aesenc_si128(bits0, k); \
bits1 = _mm_aesenc_si128(bits1, k); \
bits2 = _mm_aesenc_si128(bits2, k); \
bits3 = _mm_aesenc_si128(bits3, k); \
bits4 = _mm_aesenc_si128(bits4, k); \
bits5 = _mm_aesenc_si128(bits5, k); \
} while (0)
size_t aesi;
for (aesi = 1; aesi <= gdata_cnt; ++aesi) {
AESECB6_UPDATE(aesi);
gfmul_nextstep128(&gstate, _mm_loadu_si128(gdata++), --ghash_precompute);
}
for (; aesi < ctx->super.ecb.rounds; ++aesi)
AESECB6_UPDATE(aesi);
__m128i k = ctx->super.ecb.keys.m128[aesi];
bits0 = _mm_aesenclast_si128(bits0, k);
bits1 = _mm_aesenclast_si128(bits1, k);
bits2 = _mm_aesenclast_si128(bits2, k);
bits3 = _mm_aesenclast_si128(bits3, k);
bits4 = _mm_aesenclast_si128(bits4, k);
bits5 = _mm_aesenclast_si128(bits5, k);
#undef AESECB6_UPDATE
}
/* apply aes bits */
if (PTLS_LIKELY(nondata_aes_cnt == 0 && src_aeslen >= 6 * 16)) {
#define APPLY(i) _mm_storeu_si128(dst + i, _mm_xor_si128(_mm_loadu_si128(src_aes + i), bits##i))
APPLY(0);
APPLY(1);
APPLY(2);
APPLY(3);
APPLY(4);
APPLY(5);
#undef APPLY
dst += 6;
src_aes += 6;
src_aeslen -= 6 * 16;
} else {
if ((state & STATE_IS_FIRST_RUN) != 0) {
ek0 = bits0;
state &= ~STATE_IS_FIRST_RUN;
}
switch (nondata_aes_cnt) {
#define APPLY(i) \
case i: \
if (PTLS_LIKELY(src_aeslen > 16)) { \
_mm_storeu_si128(dst++, _mm_xor_si128(_mm_loadu_si128(src_aes++), bits##i)); \
src_aeslen -= 16; \
} else { \
bits0 = bits##i; \
goto Finish; \
}
APPLY(0);
APPLY(1);
APPLY(2);
APPLY(3);
APPLY(4);
APPLY(5);
#undef APPLY
}
nondata_aes_cnt = 0;
}
}
Finish:
if (src_aeslen == 16) {
_mm_storeu_si128(dst, _mm_xor_si128(_mm_loadu_si128(src_aes), bits0));
} else if (src_aeslen != 0) {
storen128(dst, src_aeslen, _mm_xor_si128(loadn128(src_aes, src_aeslen), bits0));
}
assert((state & STATE_IS_FIRST_RUN) == 0);
/* the only case where AES operation is complete and GHASH is not is when the application of AC is remaining */
if ((state & STATE_GHASH_HAS_MORE) != 0) {
assert(ghash_precompute - 1 == ctx->ghash);
gfmul_nextstep128(&gstate, ac, --ghash_precompute);
}
gfmul_reduce128(&gstate);
__m128i calctag = gfmul_get_tag128(&gstate, ek0);
return _mm_movemask_epi8(_mm_cmpeq_epi8(calctag, _mm_loadu_si128(tag))) == 0xffff;
#undef STATE_IS_FIRST_RUN
#undef STATE_GHASH_HAS_MORE
}
static __m128i expand_key(__m128i key, __m128i temp)
{
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
key = _mm_xor_si128(key, temp);
return key;
}
void ptls_fusion_aesecb_init(ptls_fusion_aesecb_context_t *ctx, int is_enc, const void *key, size_t key_size, int aesni256)
{
assert(is_enc && "decryption is not supported (yet)");
size_t i = 0;
switch (key_size) {
case 16: /* AES128 */
ctx->rounds = 10;
break;
case 32: /* AES256 */
ctx->rounds = 14;
break;
default:
assert(!"invalid key size; AES128 / AES256 are supported");
break;
}
ctx->aesni256 = aesni256;
/* load and expand keys using keys.m128 */
ctx->keys.m128[i++] = _mm_loadu_si128((__m128i *)key);
if (key_size == 32)
ctx->keys.m128[i++] = _mm_loadu_si128((__m128i *)key + 1);
while (1) {
#define EXPAND(R) \
{ \
ctx->keys.m128[i] = \
expand_key(ctx->keys.m128[i - key_size / 16], \
_mm_shuffle_epi32(_mm_aeskeygenassist_si128(ctx->keys.m128[i - 1], R), _MM_SHUFFLE(3, 3, 3, 3))); \
if (i == ctx->rounds) \
break; \
++i; \
if (key_size > 24) { \
ctx->keys.m128[i] = \
expand_key(ctx->keys.m128[i - key_size / 16], \
_mm_shuffle_epi32(_mm_aeskeygenassist_si128(ctx->keys.m128[i - 1], R), _MM_SHUFFLE(2, 2, 2, 2))); \
++i; \
} \
}
EXPAND(0x1);
EXPAND(0x2);
EXPAND(0x4);
EXPAND(0x8);
EXPAND(0x10);
EXPAND(0x20);
EXPAND(0x40);
EXPAND(0x80);
EXPAND(0x1b);
EXPAND(0x36);
#undef EXPAND
}
/* convert to keys.m256 if aesni256 is used */
if (ctx->aesni256) {
size_t i = ctx->rounds;
do {
ctx->keys.m256[i] = _mm256_broadcastsi128_si256(ctx->keys.m128[i]);
} while (i-- != 0);
}
}
void ptls_fusion_aesecb_dispose(ptls_fusion_aesecb_context_t *ctx)
{
ptls_clear_memory(ctx, sizeof(*ctx));
}
void ptls_fusion_aesecb_encrypt(ptls_fusion_aesecb_context_t *ctx, void *dst, const void *src)
{
__m128i v = _mm_loadu_si128(src);
v = aesecb_encrypt(ctx, v);
_mm_storeu_si128(dst, v);
}
/**
* returns the number of ghash entries that is required to handle an AEAD block of given size
*/
static size_t aesgcm_calc_ghash_cnt(size_t capacity)
{
// round-up by block size, add to handle worst split of the size between AAD and payload, plus context to hash AC
return (capacity + 15) / 16 + 2;
}
static void setup_one_ghash_entry(ptls_fusion_aesgcm_context_t *ctx)
{
__m128i *H, *r, *Hprev, H0;
if (ctx->ecb.aesni256) {
struct ptls_fusion_aesgcm_context256 *ctx256 = (void *)ctx;
#define GET_SLOT(i, mem) (&ctx256->ghash[(i) / 2].mem[(i) % 2 == 0])
H = GET_SLOT(ctx->ghash_cnt, H);
r = GET_SLOT(ctx->ghash_cnt, r);
Hprev = ctx->ghash_cnt == 0 ? NULL : GET_SLOT(ctx->ghash_cnt - 1, H);
#undef GET_SLOT
H0 = ctx256->ghash[0].H[1];
} else {
struct ptls_fusion_aesgcm_context128 *ctx128 = (void *)ctx;
H = &ctx128->ghash[ctx->ghash_cnt].H;
r = &ctx128->ghash[ctx->ghash_cnt].r;
Hprev = ctx->ghash_cnt == 0 ? NULL : &ctx128->ghash[ctx->ghash_cnt - 1].H;
H0 = ctx128->ghash[0].H;
}
if (Hprev != NULL)
*H = gfmul(*Hprev, H0);
*r = _mm_shuffle_epi32(*H, 78);
*r = _mm_xor_si128(*r, *H);
++ctx->ghash_cnt;
}
static size_t calc_aesgcm_context_size(size_t *ghash_cnt, int aesni256)
{
size_t sz;
if (aesni256) {
if (*ghash_cnt % 2 != 0)
++*ghash_cnt;
sz = offsetof(struct ptls_fusion_aesgcm_context256, ghash) +
sizeof(union ptls_fusion_aesgcm_ghash_precompute256) * *ghash_cnt / 2;
} else {
sz = offsetof(struct ptls_fusion_aesgcm_context128, ghash) +
sizeof(struct ptls_fusion_aesgcm_ghash_precompute128) * *ghash_cnt;
}
return sz;
}
static ptls_fusion_aesgcm_context_t *new_aesgcm(const void *key, size_t key_size, size_t capacity, int aesni256)
{
ptls_fusion_aesgcm_context_t *ctx;
size_t ghash_cnt = aesgcm_calc_ghash_cnt(capacity), ctx_size = calc_aesgcm_context_size(&ghash_cnt, aesni256);
if ((ctx = aligned_alloc(32, ctx_size)) == NULL)
return NULL;
ptls_fusion_aesecb_init(&ctx->ecb, 1, key, key_size, aesni256);
ctx->capacity = capacity;
__m128i H0 = aesecb_encrypt(&ctx->ecb, _mm_setzero_si128());
H0 = _mm_shuffle_epi8(H0, byteswap128);
H0 = transformH(H0);
if (ctx->ecb.aesni256) {
((struct ptls_fusion_aesgcm_context256 *)ctx)->ghash[0].H[1] = H0;
} else {
((struct ptls_fusion_aesgcm_context128 *)ctx)->ghash[0].H = H0;
}
ctx->ghash_cnt = 0;
while (ctx->ghash_cnt < ghash_cnt)
setup_one_ghash_entry(ctx);
return ctx;
}
ptls_fusion_aesgcm_context_t *ptls_fusion_aesgcm_new(const void *key, size_t key_size, size_t capacity)
{
return new_aesgcm(key, key_size, capacity, 0);
}
ptls_fusion_aesgcm_context_t *ptls_fusion_aesgcm_set_capacity(ptls_fusion_aesgcm_context_t *ctx, size_t capacity)
{
size_t new_ghash_cnt = aesgcm_calc_ghash_cnt(capacity);
if (new_ghash_cnt <= ctx->ghash_cnt)
return ctx;
size_t new_ctx_size = calc_aesgcm_context_size(&new_ghash_cnt, ctx->ecb.aesni256),
old_ctx_size = calc_aesgcm_context_size(&ctx->ghash_cnt, ctx->ecb.aesni256);
ptls_fusion_aesgcm_context_t *newp;
if ((newp = aligned_alloc(32, new_ctx_size)) == NULL)
return NULL;
memcpy(newp, ctx, old_ctx_size);
ptls_clear_memory(ctx, old_ctx_size);
aligned_free(ctx);
ctx = newp;
ctx->capacity = capacity;
while (ctx->ghash_cnt < new_ghash_cnt)
setup_one_ghash_entry(ctx);
return ctx;
}
void ptls_fusion_aesgcm_free(ptls_fusion_aesgcm_context_t *ctx)
{
ptls_clear_memory(ctx, calc_aesgcm_context_size(&ctx->ghash_cnt, ctx->ecb.aesni256));
/* skip ptls_fusion_aesecb_dispose, based on the knowledge that it does not allocate memory elsewhere */
aligned_free(ctx);
}
static void ctr_dispose(ptls_cipher_context_t *_ctx)
{
struct ctr_context *ctx = (struct ctr_context *)_ctx;
ptls_fusion_aesecb_dispose(&ctx->fusion);
_mm_storeu_si128(&ctx->bits, _mm_setzero_si128());
}
static void ctr_init(ptls_cipher_context_t *_ctx, const void *iv)
{
struct ctr_context *ctx = (struct ctr_context *)_ctx;
_mm_storeu_si128(&ctx->bits, aesecb_encrypt(&ctx->fusion, _mm_loadu_si128(iv)));
ctx->is_ready = 1;
}
static void ctr_transform(ptls_cipher_context_t *_ctx, void *output, const void *input, size_t len)
{
struct ctr_context *ctx = (struct ctr_context *)_ctx;
assert((ctx->is_ready && len <= 16) ||
!"CTR transfomation is supported only once per call to `init` and the maximum size is limited to 16 bytes");
ctx->is_ready = 0;
if (len < 16) {
storen128(output, len, _mm_xor_si128(_mm_loadu_si128(&ctx->bits), loadn128(input, len)));
} else {
_mm_storeu_si128(output, _mm_xor_si128(_mm_loadu_si128(&ctx->bits), _mm_loadu_si128(input)));
}
}
static int aesctr_setup(ptls_cipher_context_t *_ctx, int is_enc, const void *key, size_t key_size)
{
struct ctr_context *ctx = (struct ctr_context *)_ctx;
ctx->super.do_dispose = ctr_dispose;
ctx->super.do_init = ctr_init;
ctx->super.do_transform = ctr_transform;
ptls_fusion_aesecb_init(&ctx->fusion, 1, key, key_size, 0 /* probably we do not need aesni256 for CTR? */);
ctx->is_ready = 0;
return 0;
}
static int aes128ctr_setup(ptls_cipher_context_t *ctx, int is_enc, const void *key)
{
return aesctr_setup(ctx, is_enc, key, PTLS_AES128_KEY_SIZE);
}
static int aes256ctr_setup(ptls_cipher_context_t *ctx, int is_enc, const void *key)
{
return aesctr_setup(ctx, is_enc, key, PTLS_AES256_KEY_SIZE);
}
static void aesgcm_dispose_crypto(ptls_aead_context_t *_ctx)
{
struct aesgcm_context *ctx = (struct aesgcm_context *)_ctx;
ptls_fusion_aesgcm_free(ctx->aesgcm);
}
static void aead_do_encrypt_init(ptls_aead_context_t *_ctx, uint64_t seq, const void *aad, size_t aadlen)
{
assert(!"FIXME");
}
static size_t aead_do_encrypt_update(ptls_aead_context_t *_ctx, void *output, const void *input, size_t inlen)
{
assert(!"FIXME");
return SIZE_MAX;
}
static size_t aead_do_encrypt_final(ptls_aead_context_t *_ctx, void *_output)
{
assert(!"FIXME");
return SIZE_MAX;
}
static inline __m128i calc_counter(struct aesgcm_context *ctx, uint64_t seq)
{
__m128i ctr = _mm_setzero_si128();
ctr = _mm_insert_epi64(ctr, seq, 0);
ctr = _mm_slli_si128(ctr, 4);
ctr = _mm_xor_si128(ctx->static_iv, ctr);
return ctr;
}
void aead_do_encrypt(struct st_ptls_aead_context_t *_ctx, void *output, const void *input, size_t inlen, uint64_t seq,
const void *aad, size_t aadlen, ptls_aead_supplementary_encryption_t *supp)
{
struct aesgcm_context *ctx = (void *)_ctx;
if (inlen + aadlen > ctx->aesgcm->capacity)
ctx->aesgcm = ptls_fusion_aesgcm_set_capacity(ctx->aesgcm, inlen + aadlen);
ptls_fusion_aesgcm_encrypt(ctx->aesgcm, output, input, inlen, calc_counter(ctx, seq), aad, aadlen, supp);
}
static void aead_do_encrypt_v(struct st_ptls_aead_context_t *ctx, void *output, ptls_iovec_t *input, size_t incnt, uint64_t seq,
const void *aad, size_t aadlen)
{
assert(!"FIXME");
}
static size_t aead_do_decrypt(ptls_aead_context_t *_ctx, void *output, const void *input, size_t inlen, uint64_t seq,
const void *aad, size_t aadlen)
{
struct aesgcm_context *ctx = (void *)_ctx;
if (inlen < 16)
return SIZE_MAX;
size_t enclen = inlen - 16;
if (enclen + aadlen > ctx->aesgcm->capacity)
ctx->aesgcm = ptls_fusion_aesgcm_set_capacity(ctx->aesgcm, enclen + aadlen);
if (!ptls_fusion_aesgcm_decrypt(ctx->aesgcm, output, input, enclen, calc_counter(ctx, seq), aad, aadlen,
(const uint8_t *)input + enclen))
return SIZE_MAX;
return enclen;
}
static inline void aesgcm_get_iv(ptls_aead_context_t *_ctx, void *iv)
{
struct aesgcm_context *ctx = (struct aesgcm_context *)_ctx;
__m128i m128 = _mm_shuffle_epi8(ctx->static_iv, byteswap128);
storen128(iv, PTLS_AESGCM_IV_SIZE, m128);
}
static inline void aesgcm_set_iv(ptls_aead_context_t *_ctx, const void *iv)
{
struct aesgcm_context *ctx = (struct aesgcm_context *)_ctx;
ctx->static_iv = loadn128(iv, PTLS_AESGCM_IV_SIZE);
ctx->static_iv = _mm_shuffle_epi8(ctx->static_iv, byteswap128);
}
static int aesgcm_setup(ptls_aead_context_t *_ctx, int is_enc, const void *key, const void *iv, size_t key_size)
{
struct aesgcm_context *ctx = (struct aesgcm_context *)_ctx;
ctx->static_iv = loadn128(iv, PTLS_AESGCM_IV_SIZE);
ctx->static_iv = _mm_shuffle_epi8(ctx->static_iv, byteswap128);
if (key == NULL)
return 0;
ctx->super.dispose_crypto = aesgcm_dispose_crypto;
ctx->super.do_get_iv = aesgcm_get_iv;
ctx->super.do_set_iv = aesgcm_set_iv;
ctx->super.do_encrypt_init = aead_do_encrypt_init;
ctx->super.do_encrypt_update = aead_do_encrypt_update;
ctx->super.do_encrypt_final = aead_do_encrypt_final;
ctx->super.do_encrypt = aead_do_encrypt;
ctx->super.do_encrypt_v = aead_do_encrypt_v;
ctx->super.do_decrypt = aead_do_decrypt;
ctx->aesgcm = new_aesgcm(key, key_size, 1500 /* assume ordinary packet size */, 0 /* no support for aesni256 yet */);
return 0;
}
static int aes128gcm_setup(ptls_aead_context_t *ctx, int is_enc, const void *key, const void *iv)
{
return aesgcm_setup(ctx, is_enc, key, iv, PTLS_AES128_KEY_SIZE);
}
static int aes256gcm_setup(ptls_aead_context_t *ctx, int is_enc, const void *key, const void *iv)
{
return aesgcm_setup(ctx, is_enc, key, iv, PTLS_AES256_KEY_SIZE);
}
int ptls_fusion_can_aesni256 = 0;
ptls_cipher_algorithm_t ptls_fusion_aes128ctr = {"AES128-CTR",
PTLS_AES128_KEY_SIZE,
1, // block size
PTLS_AES_IV_SIZE,
sizeof(struct ctr_context),
aes128ctr_setup};
ptls_cipher_algorithm_t ptls_fusion_aes256ctr = {"AES256-CTR",
PTLS_AES256_KEY_SIZE,
1, // block size
PTLS_AES_IV_SIZE,
sizeof(struct ctr_context),
aes256ctr_setup};
ptls_aead_algorithm_t ptls_fusion_aes128gcm = {"AES128-GCM",
PTLS_AESGCM_CONFIDENTIALITY_LIMIT,
PTLS_AESGCM_INTEGRITY_LIMIT,
&ptls_fusion_aes128ctr,
NULL, // &ptls_fusion_aes128ecb,
PTLS_AES128_KEY_SIZE,
PTLS_AESGCM_IV_SIZE,
PTLS_AESGCM_TAG_SIZE,
{0}, // while it may work, no reason to support TLS/1.2
0,
0,
sizeof(struct aesgcm_context),
aes128gcm_setup};
ptls_aead_algorithm_t ptls_fusion_aes256gcm = {"AES256-GCM",
PTLS_AESGCM_CONFIDENTIALITY_LIMIT,
PTLS_AESGCM_INTEGRITY_LIMIT,
&ptls_fusion_aes256ctr,
NULL, // &ptls_fusion_aes256ecb,
PTLS_AES256_KEY_SIZE,
PTLS_AESGCM_IV_SIZE,
PTLS_AESGCM_TAG_SIZE,
{0}, // while it may work, no reason to support TLS/1.2
0,
0,
sizeof(struct aesgcm_context),
aes256gcm_setup};
static inline size_t calc_total_length(ptls_iovec_t *input, size_t incnt)
{
size_t totlen = 0;
for (size_t i = 0; i < incnt; ++i)
totlen += input[i].len;
return totlen;
}
static inline void reduce_aad128(struct ptls_fusion_gfmul_state128 *gstate, struct ptls_fusion_aesgcm_ghash_precompute128 *ghash,
const void *_aad, size_t aadlen)
{
struct ptls_fusion_aesgcm_ghash_precompute128 *ghash_precompute;
const uint8_t *aad = _aad;
while (PTLS_UNLIKELY(aadlen >= 6 * 16)) {
ghash_precompute = ghash + 6;
gfmul_firststep128(gstate, _mm_loadu_si128((void *)aad), --ghash_precompute);
aad += 16;
aadlen -= 16;
for (int i = 1; i < 6; ++i) {
gfmul_nextstep128(gstate, _mm_loadu_si128((void *)aad), --ghash_precompute);
aad += 16;
aadlen -= 16;
}
gfmul_reduce128(gstate);
}
if (PTLS_LIKELY(aadlen != 0)) {
ghash_precompute = ghash + (aadlen + 15) / 16;
if (PTLS_UNLIKELY(aadlen >= 16)) {
gfmul_firststep128(gstate, _mm_loadu_si128((void *)aad), --ghash_precompute);
aad += 16;
aadlen -= 16;
while (aadlen >= 16) {
gfmul_nextstep128(gstate, _mm_loadu_si128((void *)aad), --ghash_precompute);
aad += 16;
aadlen -= 16;
}
if (PTLS_LIKELY(aadlen != 0))
gfmul_nextstep128(gstate, loadn128(aad, aadlen), --ghash_precompute);
} else {
gfmul_firststep128(gstate, loadn128(aad, aadlen), --ghash_precompute);
}
assert(ghash == ghash_precompute);
gfmul_reduce128(gstate);
}
}
NO_SANITIZE_ADDRESS
static inline uint8_t *load_preceding_unaligned(uint8_t *encbuf, uint8_t **output)
{
uint8_t *encp;
if ((encp = encbuf + ((uintptr_t)*output & 63)) != encbuf) {
_mm256_store_si256((void *)encbuf, _mm256_load_si256((void *)(*output - (encp - encbuf))));
_mm256_store_si256((void *)(encbuf + 32), _mm256_load_si256((void *)(*output - (encp - encbuf) + 32)));
*output -= encp - encbuf;
}
return encp;
}
NO_SANITIZE_ADDRESS
static inline void write_remaining_bytes(uint8_t *dst, const uint8_t *src, const uint8_t *end)
{
/* Write in 64-byte chunks, using NT store instructions. Last partial block, if any, is written to cache, as that cache line
* would likely be read when the next TLS record is being built. */
for (; end - src >= 64; dst += 64, src += 64) {
_mm256_stream_si256((void *)dst, _mm256_load_si256((void *)src));
_mm256_stream_si256((void *)(dst + 32), _mm256_load_si256((void *)(src + 32)));
}
_mm_sfence(); /* weakly ordered writes have to be synced before being passed to NIC */
if (src != end) {
for (; end - src >= 16; dst += 16, src += 16)
_mm_store_si128((void *)dst, _mm_load_si128((void *)src));
if (src != end)
storen128((void *)dst, end - src, loadn128((void *)src, end - src));
}
}
NO_SANITIZE_ADDRESS
static void non_temporal_encrypt_v128(struct st_ptls_aead_context_t *_ctx, void *_output, ptls_iovec_t *input, size_t incnt,
uint64_t seq, const void *aad, size_t aadlen)
{
/* init the bits (we can always run in full), but use the last slot for calculating ek0, if possible */
#define AESECB6_INIT() \
do { \
ctr = _mm_add_epi64(ctr, one8); \
bits0 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits1 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits2 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits3 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits4 = _mm_shuffle_epi8(ctr, byteswap128); \
if (PTLS_LIKELY(srclen > 16 * 5) || src_vecleft != 0) { \
ctr = _mm_add_epi64(ctr, one8); \
bits5 = _mm_shuffle_epi8(ctr, byteswap128); \
} else { \
bits5 = ek0; \
state |= STATE_EK0_READY; \
} \
__m128i k = ctx->super.ecb.keys.m128[0]; \
bits0 = _mm_xor_si128(bits0, k); \
bits1 = _mm_xor_si128(bits1, k); \
bits2 = _mm_xor_si128(bits2, k); \
bits3 = _mm_xor_si128(bits3, k); \
bits4 = _mm_xor_si128(bits4, k); \
bits5 = _mm_xor_si128(bits5, k); \
} while (0)
/* aes block update */
#define AESECB6_UPDATE(i) \
do { \
__m128i k = ctx->super.ecb.keys.m128[i]; \
bits0 = _mm_aesenc_si128(bits0, k); \
bits1 = _mm_aesenc_si128(bits1, k); \
bits2 = _mm_aesenc_si128(bits2, k); \
bits3 = _mm_aesenc_si128(bits3, k); \
bits4 = _mm_aesenc_si128(bits4, k); \
bits5 = _mm_aesenc_si128(bits5, k); \
} while (0)
/* aesenclast */
#define AESECB6_FINAL(i) \
do { \
__m128i k = ctx->super.ecb.keys.m128[i]; \
bits0 = _mm_aesenclast_si128(bits0, k); \
bits1 = _mm_aesenclast_si128(bits1, k); \
bits2 = _mm_aesenclast_si128(bits2, k); \
bits3 = _mm_aesenclast_si128(bits3, k); \
bits4 = _mm_aesenclast_si128(bits4, k); \
bits5 = _mm_aesenclast_si128(bits5, k); \
} while (0)
struct aesgcm_context *agctx = (void *)_ctx;
uint8_t *output = _output;
#define STATE_EK0_READY 0x1
#define STATE_COPY_128B 0x2
int32_t state = 0;
/* Bytes are written here first then written using NT store instructions, 64 bytes at a time. */
uint8_t encbuf[32 * 6] __attribute__((aligned(32))), *encp;
/* `encbuf` should be large enough to store up to 63-bytes of unaligned bytes, 6 16-byte AES blocks, plus AEAD tag that is
* append to the ciphertext before writing the bytes to main memory using NT store instructions. */
PTLS_BUILD_ASSERT(sizeof(encbuf) >= 64 + 6 * 16 + 16);
/* load unaligned data within same cache line preceding `output`, adjusting pointers accordingly */
encp = load_preceding_unaligned(encbuf, &output);
/* First write would be 128 bytes (32+6*16), if encbuf contains no less than 32 bytes already. */
if (encp - encbuf >= 32)
state |= STATE_COPY_128B;
/* setup ctr, retain Ek(0), len(A) | len(C) to be fed into GCM */
__m128i ctr = calc_counter(agctx, seq);
ctr = _mm_insert_epi32(ctr, 1, 0);
__m128i ek0 = _mm_shuffle_epi8(ctr, byteswap128);
__m128i ac = _mm_shuffle_epi8(_mm_set_epi32(0, (int)aadlen * 8, 0, (int)calc_total_length(input, incnt) * 8), byteswap128);
struct ptls_fusion_aesgcm_context128 *ctx = (void *)agctx->aesgcm;
__m128i bits0, bits1, bits2, bits3, bits4, bits5 = _mm_setzero_si128();
struct ptls_fusion_gfmul_state128 gstate = {0};
/* find the first non-empty vec */
const uint8_t *src = NULL;
size_t srclen = 0, src_vecleft = incnt;
while (srclen == 0 && src_vecleft != 0) {
src = (void *)input[0].base;
srclen = input[0].len;
++input;
--src_vecleft;
}
/* Prepare first 6 blocks of bit stream, at the same time calculating ghash of AAD. */
AESECB6_INIT();
AESECB6_UPDATE(1);
AESECB6_UPDATE(2);
reduce_aad128(&gstate, ctx->ghash, aad, aadlen);
for (size_t i = 3; i < ctx->super.ecb.rounds; ++i)
AESECB6_UPDATE(i);
AESECB6_FINAL(ctx->super.ecb.rounds);
/* Main loop. This loop:
* 1. using current keystream (bits0..bits5), xors a up to 6 * 16 bytes and writes to encbuf,
* 2. then if there is no more data to be encrypted, exit the loop, otherwise,
* 3. calculate ghash of the blocks being written to encbuf,
* 4. calculate next 6 * 16 bytes of keystream,
* 5. writes encbuf in 64-byte blocks
* When exitting the loop, `remaining_ghash_from` represents the offset within `encbuf` from where ghash remains to be
* calculated. */
size_t remaining_ghash_from = encp - encbuf;
if (srclen != 0) {
while (1) {
/* apply the bit stream to input, writing to encbuf */
if (PTLS_LIKELY(srclen >= 6 * 16)) {
#define APPLY(i) _mm_storeu_si128((void *)(encp + i * 16), _mm_xor_si128(_mm_loadu_si128((void *)(src + i * 16)), bits##i))
APPLY(0);
APPLY(1);
APPLY(2);
APPLY(3);
APPLY(4);
APPLY(5);
#undef APPLY
encp += 6 * 16;
src += 6 * 16;
srclen -= 6 * 16;
if (PTLS_UNLIKELY(srclen == 0)) {
if (src_vecleft == 0) {
remaining_ghash_from = (encp - encbuf) - 96;
break;
}
src = (void *)input[0].base;
srclen = input[0].len;
++input;
--src_vecleft;
}
} else {
/* slow path, load at most 6 * 16 bytes to encbuf then encrypt in-place */
size_t bytes_copied = 0;
do {
if (srclen >= 16 && bytes_copied < 5 * 16) {
_mm_storeu_si128((void *)(encp + bytes_copied), _mm_loadu_si128((void *)src));
bytes_copied += 16;
src += 16;
srclen -= 16;
} else {
encp[bytes_copied++] = *src++;
--srclen;
}
if (PTLS_UNLIKELY(srclen == 0)) {
do {
if (src_vecleft == 0)
break;
src = (void *)input[0].base;
srclen = input[0].len;
++input;
--src_vecleft;
} while (srclen == 0);
if (srclen == 0)
break;
}
} while (bytes_copied < 6 * 16);
#define APPLY(i) _mm_storeu_si128((void *)(encp + i * 16), _mm_xor_si128(_mm_loadu_si128((void *)(encp + i * 16)), bits##i))
APPLY(0);
APPLY(1);
APPLY(2);
APPLY(3);
APPLY(4);
APPLY(5);
#undef APPLY
encp += bytes_copied;
if (PTLS_UNLIKELY(srclen == 0)) {
/* Calculate amonut of data left to be ghashed, as well as zero-clearing the remainedr of partial block, as it
* will be fed into ghash. */
remaining_ghash_from = (encp - encbuf) - bytes_copied;
if ((bytes_copied & 15) != 0)
_mm_storeu_si128((void *)encp, _mm_setzero_si128());
break;
}
}
/* Next 96-byte block starts here. Run AES and ghash in while writing output using non-temporal stores in 64-byte
* blocks. */
AESECB6_INIT();
struct ptls_fusion_aesgcm_ghash_precompute128 *ghash_precompute = ctx->ghash + 6;
gfmul_firststep128(&gstate, _mm_loadu_si128((void *)(encp - 6 * 16)), --ghash_precompute);
AESECB6_UPDATE(1);
gfmul_nextstep128(&gstate, _mm_loadu_si128((void *)(encp - 5 * 16)), --ghash_precompute);
AESECB6_UPDATE(2);
gfmul_nextstep128(&gstate, _mm_loadu_si128((void *)(encp - 4 * 16)), --ghash_precompute);
AESECB6_UPDATE(3);
_mm256_stream_si256((void *)output, _mm256_load_si256((void *)encbuf));
_mm256_stream_si256((void *)(output + 32), _mm256_load_si256((void *)(encbuf + 32)));
AESECB6_UPDATE(4);
gfmul_nextstep128(&gstate, _mm_loadu_si128((void *)(encp - 3 * 16)), --ghash_precompute);
AESECB6_UPDATE(5);
gfmul_nextstep128(&gstate, _mm_loadu_si128((void *)(encp - 2 * 16)), --ghash_precompute);
AESECB6_UPDATE(6);
gfmul_nextstep128(&gstate, _mm_loadu_si128((void *)(encp - 1 * 16)), --ghash_precompute);
AESECB6_UPDATE(7);
if ((state & STATE_COPY_128B) != 0) {
_mm256_stream_si256((void *)(output + 64), _mm256_load_si256((void *)(encbuf + 64)));
_mm256_stream_si256((void *)(output + 96), _mm256_load_si256((void *)(encbuf + 96)));
output += 128;
encp -= 128;
AESECB6_UPDATE(8);
_mm256_store_si256((void *)encbuf, _mm256_load_si256((void *)(encbuf + 128)));
_mm256_store_si256((void *)(encbuf + 32), _mm256_load_si256((void *)(encbuf + 160)));
} else {
output += 64;
encp -= 64;
_mm256_store_si256((void *)encbuf, _mm256_load_si256((void *)(encbuf + 64)));
_mm256_store_si256((void *)(encbuf + 32), _mm256_load_si256((void *)(encbuf + 96)));
AESECB6_UPDATE(8);
}
state ^= STATE_COPY_128B;
AESECB6_UPDATE(9);
if (PTLS_UNLIKELY(ctx->super.ecb.rounds != 10)) {
for (size_t i = 10; PTLS_LIKELY(i < ctx->super.ecb.rounds); ++i)
AESECB6_UPDATE(i);
}
assert(ctx->ghash == ghash_precompute);
gfmul_reduce128(&gstate);
AESECB6_FINAL(ctx->super.ecb.rounds);
}
}
/* Now, All the encrypted bits are built in encbuf. Calculate AEAD tag and append to encbuf. */
{ /* Run ghash against the remaining bytes, after appending `ac` (i.e., len(A) | len(C)). At this point, we might be ghashing 7
* blocks at once. */
size_t ac_off = remaining_ghash_from + ((encp - encbuf) - remaining_ghash_from + 15) / 16 * 16;
_mm_storeu_si128((void *)(encbuf + ac_off), ac);
size_t blocks = ((encp - encbuf) - remaining_ghash_from + 15) / 16 + 1; /* round up, +1 for AC */
assert(blocks <= 7);
struct ptls_fusion_aesgcm_ghash_precompute128 *ghash_precompute = ctx->ghash + blocks;
gfmul_firststep128(&gstate, _mm_loadu_si128((void *)(encbuf + remaining_ghash_from)), --ghash_precompute);
remaining_ghash_from += 16;
while (ghash_precompute != ctx->ghash) {
gfmul_nextstep128(&gstate, _mm_loadu_si128((void *)(encbuf + remaining_ghash_from)), --ghash_precompute);
remaining_ghash_from += 16;
}
gfmul_reduce128(&gstate);
}
/* Calculate EK0, if in the unlikely case on not been done yet. When encoding in full size (16K), EK0 will be ready. */
if (PTLS_UNLIKELY((state & STATE_EK0_READY) == 0)) {
bits5 = _mm_xor_si128(ek0, ctx->super.ecb.keys.m128[0]);
for (size_t i = 1; i < ctx->super.ecb.rounds; ++i)
bits5 = _mm_aesenc_si128(bits5, ctx->super.ecb.keys.m128[i]);
bits5 = _mm_aesenclast_si128(bits5, ctx->super.ecb.keys.m128[ctx->super.ecb.rounds]);
}
/* append tag to encbuf */
_mm_storeu_si128((void *)encp, gfmul_get_tag128(&gstate, bits5));
encp += 16;
/* write remaining bytes */
write_remaining_bytes(output, encbuf, encp);
#undef AESECB6_INIT
#undef AESECB6_UPDATE
#undef AESECB6_FINAL
#undef STATE_EK0_READY
#undef STATE_COPY_128B
}
static size_t non_temporal_decrypt128(ptls_aead_context_t *_ctx, void *_output, const void *_input, size_t inlen, uint64_t seq,
const void *aad, size_t aadlen)
{
/* Bail out if the input is too short, or remove tag from range. */
if (inlen < 16)
return SIZE_MAX;
inlen -= 16;
size_t textlen = inlen;
/* init the bits (we can always run in full), but use the last slot for calculating ek0, if possible */
#define AESECB6_INIT() \
do { \
ctr = _mm_add_epi64(ctr, one8); \
bits0 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits1 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits2 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits3 = _mm_shuffle_epi8(ctr, byteswap128); \
ctr = _mm_add_epi64(ctr, one8); \
bits4 = _mm_shuffle_epi8(ctr, byteswap128); \
if (PTLS_LIKELY(inlen > 16 * 5)) { \
ctr = _mm_add_epi64(ctr, one8); \
bits5 = _mm_shuffle_epi8(ctr, byteswap128); \
} else { \
bits5 = ek0; \
state |= STATE_EK0_READY; \
} \
__m128i k = ctx->super.ecb.keys.m128[0]; \
bits0 = _mm_xor_si128(bits0, k); \
bits1 = _mm_xor_si128(bits1, k); \
bits2 = _mm_xor_si128(bits2, k); \
bits3 = _mm_xor_si128(bits3, k); \
bits4 = _mm_xor_si128(bits4, k); \
bits5 = _mm_xor_si128(bits5, k); \
} while (0)
/* aes block update */
#define AESECB6_UPDATE(i) \
do { \
__m128i k = ctx->super.ecb.keys.m128[i]; \
bits0 = _mm_aesenc_si128(bits0, k); \
bits1 = _mm_aesenc_si128(bits1, k); \
bits2 = _mm_aesenc_si128(bits2, k); \
bits3 = _mm_aesenc_si128(bits3, k); \
bits4 = _mm_aesenc_si128(bits4, k); \
bits5 = _mm_aesenc_si128(bits5, k); \
} while (0)
/* aesenclast */
#define AESECB6_FINAL(i) \
do { \
__m128i k = ctx->super.ecb.keys.m128[i]; \
bits0 = _mm_aesenclast_si128(bits0, k); \
bits1 = _mm_aesenclast_si128(bits1, k); \
bits2 = _mm_aesenclast_si128(bits2, k); \
bits3 = _mm_aesenclast_si128(bits3, k); \
bits4 = _mm_aesenclast_si128(bits4, k); \
bits5 = _mm_aesenclast_si128(bits5, k); \
} while (0)
struct aesgcm_context *agctx = (void *)_ctx;
uint8_t *output = _output;
const uint8_t *input = _input;
#define STATE_EK0_READY 0x1
int32_t state = 0;
/* setup ctr, retain Ek(0), len(A) | len(C) to be fed into GCM */
__m128i ctr = calc_counter(agctx, seq);
ctr = _mm_insert_epi32(ctr, 1, 0);
__m128i ek0 = _mm_shuffle_epi8(ctr, byteswap128);
__m128i ac = _mm_shuffle_epi8(_mm_set_epi32(0, (int)aadlen * 8, 0, (int)inlen * 8), byteswap128);
struct ptls_fusion_aesgcm_context128 *ctx = (void *)agctx->aesgcm;
__m128i bits0, bits1, bits2, bits3, bits4, bits5 = _mm_setzero_si128();
struct ptls_fusion_gfmul_state128 gstate = {0};
/* Prepare first 6 blocks of bit stream, at the same time calculating ghash of AAD. */
AESECB6_INIT();
AESECB6_UPDATE(1);
AESECB6_UPDATE(2);
reduce_aad128(&gstate, ctx->ghash, aad, aadlen);
for (size_t i = 3; i < ctx->super.ecb.rounds; ++i)
AESECB6_UPDATE(i);
AESECB6_FINAL(ctx->super.ecb.rounds);
/* Main loop. Operate in full blocks (6 * 16 bytes). */
while (PTLS_LIKELY(inlen >= 6 * 16)) {
#define DECRYPT(i) _mm_storeu_si128((void *)(output + i * 16), _mm_xor_si128(bits##i, _mm_loadu_si128((void *)(input + i * 16))))
DECRYPT(0);
DECRYPT(1);
DECRYPT(2);
DECRYPT(3);
DECRYPT(4);
DECRYPT(5);
#undef DECRYPT
#define GFMUL_NEXT(i) gfmul_nextstep128(&gstate, _mm_loadu_si128((void *)(input + i * 16)), ctx->ghash + 5 - i)
AESECB6_INIT();
AESECB6_UPDATE(1);
AESECB6_UPDATE(2);
AESECB6_UPDATE(3);
gfmul_firststep128(&gstate, _mm_loadu_si128((void *)input), ctx->ghash + 5);
AESECB6_UPDATE(4);
GFMUL_NEXT(1);
AESECB6_UPDATE(5);
GFMUL_NEXT(2);
AESECB6_UPDATE(6);
GFMUL_NEXT(3);
AESECB6_UPDATE(7);
GFMUL_NEXT(4);
AESECB6_UPDATE(8);
GFMUL_NEXT(5);
AESECB6_UPDATE(9);
gfmul_reduce128(&gstate);
if (PTLS_UNLIKELY(ctx->super.ecb.rounds != 10)) {
size_t i = 10;
do {
AESECB6_UPDATE(i);
} while (++i < ctx->super.ecb.rounds);
}
AESECB6_FINAL(ctx->super.ecb.rounds);
output += 6 * 16;
input += 6 * 16;
inlen -= 6 * 16;
#undef GFMUL_NEXT
}
/* Decrypt the remainder as well as finishing GHASH calculation. */
if (inlen != 0) {
struct ptls_fusion_aesgcm_ghash_precompute128 *ghash_precompute = ctx->ghash + (inlen + 15) / 16 + 1;
#define ONEBLOCK(i) \
do { \
if (inlen != 0) { \
__m128i b = inlen >= 16 ? _mm_loadu_si128((void *)input) : loadn128(input, inlen); \
if (i == 0) { \
gfmul_firststep128(&gstate, b, --ghash_precompute); \
} else { \
gfmul_nextstep128(&gstate, b, --ghash_precompute); \
} \
b = _mm_xor_si128(b, bits##i); \
if (inlen >= 16) { \
_mm_storeu_si128((void *)output, b); \
output += 16; \
input += 16; \
inlen -= 16; \
} else { \
storen128(output, inlen, b); \
output += inlen; \
input += inlen; \
inlen = 0; \
} \
} \
} while (0)
ONEBLOCK(0);
ONEBLOCK(1);
ONEBLOCK(2);
ONEBLOCK(3);
ONEBLOCK(4);
ONEBLOCK(5);
#undef ONEBLOCK
gfmul_nextstep128(&gstate, ac, --ghash_precompute);
assert(ghash_precompute == ctx->ghash);
} else {
gfmul_firststep128(&gstate, ac, ctx->ghash);
}
gfmul_reduce128(&gstate);
/* Calculate EK0 if not yet available in bits5. */
if ((state & STATE_EK0_READY) == 0) {
bits5 = _mm_xor_si128(ek0, ctx->super.ecb.keys.m128[0]);
for (size_t i = 1; i < ctx->super.ecb.rounds; ++i)
bits5 = _mm_aesenc_si128(bits5, ctx->super.ecb.keys.m128[i]);
bits5 = _mm_aesenclast_si128(bits5, ctx->super.ecb.keys.m128[ctx->super.ecb.rounds]);
}
/* Calculate GCM tag and compare. */
__m128i calctag = gfmul_get_tag128(&gstate, bits5);
__m128i recvtag = _mm_loadu_si128((void *)input);
if (_mm_movemask_epi8(_mm_cmpeq_epi8(calctag, recvtag)) != 0xffff)
return SIZE_MAX;
return textlen;
#undef AESECB6_INIT
#undef AESECB6_UPDATE
#undef AESECB6_FINAL
#undef STATE_EK0_READY
}
NO_SANITIZE_ADDRESS
static void non_temporal_encrypt_v256(struct st_ptls_aead_context_t *_ctx, void *_output, ptls_iovec_t *input, size_t incnt,
uint64_t seq, const void *_aad, size_t aadlen)
{
/* init the bits (we can always run in full), but use the last slot for calculating ek0, if possible */
#define AESECB6_INIT() \
do { \
ctr = _mm256_add_epi64(ctr, incr128x2); \
bits0 = _mm256_shuffle_epi8(ctr, byteswap256); \
ctr = _mm256_add_epi64(ctr, incr128x2); \
bits1 = _mm256_shuffle_epi8(ctr, byteswap256); \
ctr = _mm256_add_epi64(ctr, incr128x2); \
bits2 = _mm256_shuffle_epi8(ctr, byteswap256); \
ctr = _mm256_add_epi64(ctr, incr128x2); \
bits3 = _mm256_shuffle_epi8(ctr, byteswap256); \
ctr = _mm256_add_epi64(ctr, incr128x2); \
bits4 = _mm256_shuffle_epi8(ctr, byteswap256); \
ctr = _mm256_add_epi64(ctr, incr128x2); \
bits5 = _mm256_shuffle_epi8(ctr, byteswap256); \
if (PTLS_UNLIKELY(srclen <= 32 * 6 - 16) && src_vecleft == 0) { \
bits5 = _mm256_permute2f128_si256(bits5, ac_ek0, 0x30); \
state |= STATE_EK0_READY; \
} \
__m256i k = ctx->super.ecb.keys.m256[0]; \
bits0 = _mm256_xor_si256(bits0, k); \
bits1 = _mm256_xor_si256(bits1, k); \
bits2 = _mm256_xor_si256(bits2, k); \
bits3 = _mm256_xor_si256(bits3, k); \
bits4 = _mm256_xor_si256(bits4, k); \
bits5 = _mm256_xor_si256(bits5, k); \
} while (0)
/* aes block update */
#define AESECB6_UPDATE(i) \
do { \
__m256i k = ctx->super.ecb.keys.m256[i]; \
bits0 = _mm256_aesenc_epi128(bits0, k); \
bits1 = _mm256_aesenc_epi128(bits1, k); \
bits2 = _mm256_aesenc_epi128(bits2, k); \
bits3 = _mm256_aesenc_epi128(bits3, k); \
bits4 = _mm256_aesenc_epi128(bits4, k); \
bits5 = _mm256_aesenc_epi128(bits5, k); \
} while (0)
/* aesenclast */
#define AESECB6_FINAL(i) \
do { \
__m256i k = ctx->super.ecb.keys.m256[i]; \
bits0 = _mm256_aesenclast_epi128(bits0, k); \
bits1 = _mm256_aesenclast_epi128(bits1, k); \
bits2 = _mm256_aesenclast_epi128(bits2, k); \
bits3 = _mm256_aesenclast_epi128(bits3, k); \
bits4 = _mm256_aesenclast_epi128(bits4, k); \
bits5 = _mm256_aesenclast_epi128(bits5, k); \
} while (0)
struct aesgcm_context *agctx = (void *)_ctx;
uint8_t *output = _output;
const uint8_t *aad = _aad;
#define STATE_EK0_READY 0x1
int32_t state = 0;
/* Bytes are written here first then written using NT store instructions, 64 bytes at a time. */
uint8_t encbuf[32 * 9] __attribute__((aligned(32))), *encp;
/* `encbuf` should be large enough to store up to 63-bytes of unaligned bytes, 6 16-byte AES blocks, plus AEAD tag that is
* append to the ciphertext before writing the bytes to main memory using NT store instructions. */
PTLS_BUILD_ASSERT(sizeof(encbuf) >= 64 + 6 * 32 + 16);
/* load unaligned data within same cache line preceding `output`, adjusting pointers accordingly */
encp = load_preceding_unaligned(encbuf, &output);
/* setup ctr, retaining Ek(0), len(A) | len(C) to be fed into GCM */
__m256i ctr = _mm256_broadcastsi128_si256(calc_counter(agctx, seq));
ctr = _mm256_insert_epi32(ctr, 1, 4);
__m256i ac_ek0 = _mm256_permute2f128_si256(
/* first half: ac */
_mm256_castsi128_si256(
_mm_shuffle_epi8(_mm_set_epi32(0, (int)aadlen * 8, 0, (int)calc_total_length(input, incnt) * 8), byteswap128)),
/* second half: ek0 */
_mm256_shuffle_epi8(ctr, byteswap256), 0x30);
struct ptls_fusion_aesgcm_context256 *ctx = (void *)agctx->aesgcm;
__m256i bits0, bits1, bits2, bits3, bits4, bits5 = _mm256_setzero_si256();
struct ptls_fusion_gfmul_state256 gstate = {0};
/* find the first non-empty vec */
const uint8_t *src = NULL;
size_t srclen = 0, src_vecleft = incnt;
while (srclen == 0 && src_vecleft != 0) {
src = (void *)input[0].base;
srclen = input[0].len;
++input;
--src_vecleft;
}
/* Prepare first 6 blocks of bit stream, at the same time calculating ghash of AAD. */
AESECB6_INIT();
AESECB6_UPDATE(1);
AESECB6_UPDATE(2);
if (PTLS_LIKELY(aadlen != 0)) {
union ptls_fusion_aesgcm_ghash_precompute256 *ghash_precompute;
while (PTLS_UNLIKELY(aadlen >= 6 * 32)) {
ghash_precompute = ctx->ghash + 6;
gfmul_firststep256(&gstate, _mm256_loadu_si256((void *)aad), 0, --ghash_precompute);
aad += 32;
aadlen -= 32;
for (int i = 1; i < 6; ++i) {
gfmul_nextstep256(&gstate, _mm256_loadu_si256((void *)aad), --ghash_precompute);
aad += 32;
aadlen -= 32;
}
gfmul_reduce256(&gstate);
}
if (PTLS_LIKELY(aadlen != 0)) {
ghash_precompute = ctx->ghash + (aadlen + 31) / 32;
if (PTLS_UNLIKELY(aadlen >= 32)) {
if (aadlen % 32 == 0 || aadlen % 32 > 16) {
gfmul_firststep256(&gstate, _mm256_loadu_si256((void *)aad), 0, --ghash_precompute);
aad += 32;
aadlen -= 32;
} else {
gfmul_firststep256(&gstate, _mm256_loadu_si256((void *)aad), 1, --ghash_precompute);
aad += 16;
aadlen -= 16;
}
while (aadlen >= 32) {
gfmul_nextstep256(&gstate, _mm256_loadu_si256((void *)aad), --ghash_precompute);
aad += 32;
aadlen -= 32;
}
if (PTLS_LIKELY(aadlen != 0)) {
assert(aadlen > 16);
gfmul_nextstep256(&gstate, loadn256(aad, aadlen), --ghash_precompute);
}
} else {
gfmul_firststep256(&gstate, loadn256(aad, aadlen), aadlen <= 16, --ghash_precompute);
}
assert(ctx->ghash == ghash_precompute);
gfmul_reduce256(&gstate);
}
}
for (size_t i = 3; i < ctx->super.ecb.rounds; ++i)
AESECB6_UPDATE(i);
AESECB6_FINAL(ctx->super.ecb.rounds);
/* Main loop. This loop:
* 1. using current keystream (bits0..bits5), xors a up to 6 * 16 bytes and writes to encbuf,
* 2. then if there is no more data to be encrypted, exit the loop, otherwise,
* 3. calculate ghash of the blocks being written to encbuf,
* 4. calculate next 6 * 16 bytes of keystream,
* 5. writes encbuf in 64-byte blocks
* When exitting the loop, `remaining_ghash_from` represents the offset within `encbuf` from where ghash remains to be
* calculated. */
size_t remaining_ghash_from = encp - encbuf;
if (srclen != 0) {
while (1) {
/* apply the bit stream to input, writing to encbuf */
if (PTLS_LIKELY(srclen >= 6 * 32)) {
#define APPLY(i) _mm256_storeu_si256((void *)(encp + i * 32), _mm256_xor_si256(_mm256_loadu_si256((void *)(src + i * 32)), bits##i))
APPLY(0);
APPLY(1);
APPLY(2);
APPLY(3);
APPLY(4);
APPLY(5);
#undef APPLY
encp += 6 * 32;
src += 6 * 32;
srclen -= 6 * 32;
if (PTLS_UNLIKELY(srclen == 0)) {
if (src_vecleft == 0) {
remaining_ghash_from = (encp - encbuf) - 6 * 32;
break;
}
src = (void *)input[0].base;
srclen = input[0].len;
++input;
--src_vecleft;
}
} else {
/* slow path, load at most 6 * 32 bytes to encbuf then encrypt in-place */
size_t bytes_copied = 0;
do {
if (srclen >= 32 && bytes_copied < 5 * 32) {
_mm256_storeu_si256((void *)(encp + bytes_copied), _mm256_loadu_si256((void *)src));
bytes_copied += 32;
src += 32;
srclen -= 32;
} else {
encp[bytes_copied++] = *src++;
--srclen;
}
if (PTLS_UNLIKELY(srclen == 0)) {
do {
if (src_vecleft == 0)
break;
src = (void *)input[0].base;
srclen = input[0].len;
++input;
--src_vecleft;
} while (srclen == 0);
if (srclen == 0)
break;
}
} while (bytes_copied < 6 * 32);
#define APPLY(i) \
_mm256_storeu_si256((void *)(encp + i * 32), _mm256_xor_si256(_mm256_loadu_si256((void *)(encp + i * 32)), bits##i))
APPLY(0);
APPLY(1);
APPLY(2);
APPLY(3);
APPLY(4);
APPLY(5);
#undef APPLY
encp += bytes_copied;
if (PTLS_UNLIKELY(srclen == 0)) {
/* Calculate amonut of data left to be ghashed, as well as zero-clearing the remainedr of partial block, as it
* will be fed into ghash. */
remaining_ghash_from = (encp - encbuf) - bytes_copied;
if ((bytes_copied & 15) != 0)
_mm_storeu_si128((void *)encp, _mm_setzero_si128());
break;
}
}
/* Next 96-byte block starts here. Run AES and ghash in parallel while writing output using non-temporal store
* instructions. */
AESECB6_INIT();
union ptls_fusion_aesgcm_ghash_precompute256 *ghash_precompute = ctx->ghash + 6;
gfmul_firststep256(&gstate, _mm256_loadu_si256((void *)(encp - 6 * 32)), 0, --ghash_precompute);
AESECB6_UPDATE(1);
gfmul_nextstep256(&gstate, _mm256_loadu_si256((void *)(encp - 5 * 32)), --ghash_precompute);
AESECB6_UPDATE(2);
gfmul_nextstep256(&gstate, _mm256_loadu_si256((void *)(encp - 4 * 32)), --ghash_precompute);
AESECB6_UPDATE(3);
gfmul_nextstep256(&gstate, _mm256_loadu_si256((void *)(encp - 3 * 32)), --ghash_precompute);
AESECB6_UPDATE(4);
_mm256_stream_si256((void *)output, _mm256_load_si256((void *)encbuf));
_mm256_stream_si256((void *)(output + 32), _mm256_load_si256((void *)(encbuf + 32)));
_mm256_stream_si256((void *)(output + 64), _mm256_load_si256((void *)(encbuf + 64)));
_mm256_stream_si256((void *)(output + 96), _mm256_load_si256((void *)(encbuf + 96)));
_mm256_stream_si256((void *)(output + 128), _mm256_load_si256((void *)(encbuf + 128)));
_mm256_stream_si256((void *)(output + 160), _mm256_load_si256((void *)(encbuf + 160)));
AESECB6_UPDATE(5);
gfmul_nextstep256(&gstate, _mm256_loadu_si256((void *)(encp - 2 * 32)), --ghash_precompute);
AESECB6_UPDATE(6);
gfmul_nextstep256(&gstate, _mm256_loadu_si256((void *)(encp - 1 * 32)), --ghash_precompute);
output += 192;
encp -= 192;
AESECB6_UPDATE(7);
_mm256_store_si256((void *)encbuf, _mm256_load_si256((void *)(encbuf + 192)));
AESECB6_UPDATE(8);
_mm256_store_si256((void *)(encbuf + 32), _mm256_load_si256((void *)(encbuf + 224)));
AESECB6_UPDATE(9);
if (PTLS_UNLIKELY(ctx->super.ecb.rounds != 10)) {
for (size_t i = 10; PTLS_LIKELY(i < ctx->super.ecb.rounds); ++i)
AESECB6_UPDATE(i);
}
assert(ctx->ghash == ghash_precompute);
gfmul_reduce256(&gstate);
AESECB6_FINAL(ctx->super.ecb.rounds);
}
}
/* Now, All the encrypted bits are built in encbuf. Calculate AEAD tag and append to encbuf. */
{ /* Run ghash against the remaining bytes, after appending `ac` (i.e., len(A) | len(C)). At this point, we might be ghashing 7
* blocks at once. */
size_t ac_off = remaining_ghash_from + ((encp - encbuf) - remaining_ghash_from + 15) / 16 * 16;
_mm_storeu_si128((void *)(encbuf + ac_off), _mm256_castsi256_si128(ac_ek0));
size_t blocks = ((encp - encbuf) - remaining_ghash_from + 15) / 16 + 1; /* round up, +1 for AC */
assert(blocks <= 13);
union ptls_fusion_aesgcm_ghash_precompute256 *ghash_precompute = ctx->ghash + blocks / 2;
if (blocks % 2 != 0) {
gfmul_firststep256(&gstate, _mm256_loadu_si256((void *)(encbuf + remaining_ghash_from)), 1, ghash_precompute);
remaining_ghash_from += 16;
} else {
gfmul_firststep256(&gstate, _mm256_loadu_si256((void *)(encbuf + remaining_ghash_from)), 0, --ghash_precompute);
remaining_ghash_from += 32;
}
while (ghash_precompute != ctx->ghash) {
gfmul_nextstep256(&gstate, _mm256_loadu_si256((void *)(encbuf + remaining_ghash_from)), --ghash_precompute);
remaining_ghash_from += 32;
}
gfmul_reduce256(&gstate);
}
/* Calculate EK0, if in the unlikely case on not been done yet. When encoding in full size (16K), EK0 will be ready. */
if (PTLS_UNLIKELY((state & STATE_EK0_READY) == 0)) {
bits5 = ac_ek0;
bits5 = _mm256_xor_si256(bits5, ctx->super.ecb.keys.m256[0]);
for (size_t i = 1; i < ctx->super.ecb.rounds; ++i)
bits5 = _mm256_aesenc_epi128(bits5, ctx->super.ecb.keys.m256[i]);
bits5 = _mm256_aesenclast_epi128(bits5, ctx->super.ecb.keys.m256[ctx->super.ecb.rounds]);
}
/* append tag to encbuf */
_mm_storeu_si128((void *)encp,
gfmul_get_tag256(&gstate, _mm256_castsi256_si128(_mm256_permute2f128_si256(bits5, bits5, 0x11))));
encp += 16;
/* write remaining bytes */
write_remaining_bytes(output, encbuf, encp);
}
static int non_temporal_setup(ptls_aead_context_t *_ctx, int is_enc, const void *key, const void *iv, size_t key_size)
{
struct aesgcm_context *ctx = (struct aesgcm_context *)_ctx;
int aesni256 = is_enc && ptls_fusion_can_aesni256;
ctx->static_iv = loadn128(iv, PTLS_AESGCM_IV_SIZE);
ctx->static_iv = _mm_shuffle_epi8(ctx->static_iv, byteswap128);
if (key == NULL)
return 0;
ctx->super.dispose_crypto = aesgcm_dispose_crypto;
ctx->super.do_get_iv = aesgcm_get_iv;
ctx->super.do_set_iv = aesgcm_set_iv;
ctx->super.do_encrypt_init = NULL;
ctx->super.do_encrypt_update = NULL;
ctx->super.do_encrypt_final = NULL;
if (is_enc) {
ctx->super.do_encrypt = ptls_aead__do_encrypt;
ctx->super.do_encrypt_v = aesni256 ? non_temporal_encrypt_v256 : non_temporal_encrypt_v128;
ctx->super.do_decrypt = NULL;
} else {
assert(!aesni256);
ctx->super.do_encrypt = NULL;
ctx->super.do_encrypt_v = NULL;
ctx->super.do_decrypt = non_temporal_decrypt128;
}
ctx->aesgcm =
new_aesgcm(key, key_size,
7 * (ptls_fusion_can_aesni256 ? 32 : 16), // 6 blocks at once, plus len(A) | len(C) that we might append
aesni256);
return 0;
}
static int non_temporal_aes128gcm_setup(ptls_aead_context_t *ctx, int is_enc, const void *key, const void *iv)
{
return non_temporal_setup(ctx, is_enc, key, iv, PTLS_AES128_KEY_SIZE);
}
static int non_temporal_aes256gcm_setup(ptls_aead_context_t *ctx, int is_enc, const void *key, const void *iv)
{
return non_temporal_setup(ctx, is_enc, key, iv, PTLS_AES256_KEY_SIZE);
}
ptls_aead_algorithm_t ptls_non_temporal_aes128gcm = {"AES128-GCM",
PTLS_AESGCM_CONFIDENTIALITY_LIMIT,
PTLS_AESGCM_INTEGRITY_LIMIT,
&ptls_fusion_aes128ctr,
NULL, // &ptls_fusion_aes128ecb,
PTLS_AES128_KEY_SIZE,
PTLS_AESGCM_IV_SIZE,
PTLS_AESGCM_TAG_SIZE,
{PTLS_TLS12_AESGCM_FIXED_IV_SIZE, PTLS_TLS12_AESGCM_RECORD_IV_SIZE},
1,
PTLS_X86_CACHE_LINE_ALIGN_BITS,
sizeof(struct aesgcm_context),
non_temporal_aes128gcm_setup};
ptls_aead_algorithm_t ptls_non_temporal_aes256gcm = {"AES256-GCM",
PTLS_AESGCM_CONFIDENTIALITY_LIMIT,
PTLS_AESGCM_INTEGRITY_LIMIT,
&ptls_fusion_aes256ctr,
NULL, // &ptls_fusion_aes128ecb,
PTLS_AES256_KEY_SIZE,
PTLS_AESGCM_IV_SIZE,
PTLS_AESGCM_TAG_SIZE,
{PTLS_TLS12_AESGCM_FIXED_IV_SIZE, PTLS_TLS12_AESGCM_RECORD_IV_SIZE},
1,
PTLS_X86_CACHE_LINE_ALIGN_BITS,
sizeof(struct aesgcm_context),
non_temporal_aes256gcm_setup};
#ifdef _WINDOWS
/**
* ptls_fusion_is_supported_by_cpu:
* Check that the CPU has extended instructions for PCMUL, AES and AVX2.
* This test assumes that the CPU is following the x86/x64 architecture.
* A slightly more refined test could check that the cpu_info spells out
* "genuineIntel" or "authenticAMD", but would fail in presence of
* little known CPU brands or some VM */
int ptls_fusion_is_supported_by_cpu(void)
{
uint32_t cpu_info[4];
uint32_t nb_ids;
int is_supported = 0;
__cpuid(cpu_info, 0);
nb_ids = cpu_info[0];
if (nb_ids >= 7) {
uint32_t leaf1_ecx;
__cpuid(cpu_info, 1);
leaf1_ecx = cpu_info[2];
if (/* PCLMUL */ (leaf1_ecx & (1 << 5)) != 0 && /* AES */ (leaf1_ecx & (1 << 25)) != 0) {
uint32_t leaf7_ebx, leaf7_ecx;
__cpuid(cpu_info, 7);
leaf7_ebx = cpu_info[1];
leaf7_ecx = cpu_info[2];
is_supported = /* AVX2 */ (leaf7_ebx & (1 << 5)) != 0;
/* enable 256-bit mode if possible */
if (is_supported && (leaf7_ecx & 0x600) != 0 && !ptls_fusion_can_aesni256)
ptls_fusion_can_aesni256 = 1;
}
}
return is_supported;
}
#else
int ptls_fusion_is_supported_by_cpu(void)
{
unsigned leaf1_ecx, leaf7_ebx, leaf7_ecx;
{ /* GCC-specific code to obtain CPU features */
unsigned leaf_cnt;
__asm__("cpuid" : "=a"(leaf_cnt) : "a"(0) : "ebx", "ecx", "edx");
if (leaf_cnt < 7)
return 0;
__asm__("cpuid" : "=c"(leaf1_ecx) : "a"(1) : "ebx", "edx");
__asm__("cpuid" : "=b"(leaf7_ebx), "=c"(leaf7_ecx) : "a"(7), "c"(0) : "edx");
}
/* AVX2 */
if ((leaf7_ebx & (1 << 5)) == 0)
return 0;
/* AES */
if ((leaf1_ecx & (1 << 25)) == 0)
return 0;
/* PCLMUL */
if ((leaf1_ecx & (1 << 1)) == 0)
return 0;
/* enable 256-bit mode if possible */
if ((leaf7_ecx & 0x600) != 0 && !ptls_fusion_can_aesni256)
ptls_fusion_can_aesni256 = 1;
return 1;
}
#endif