/* | |
* AES-NI support functions | |
* | |
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved | |
* SPDX-License-Identifier: Apache-2.0 | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); you may | |
* not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | |
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
* | |
* This file is part of mbed TLS (https://tls.mbed.org) | |
*/ | |
/* | |
* [AES-WP] http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set | |
* [CLMUL-WP] http://software.intel.com/en-us/articles/intel-carry-less-multiplication-instruction-and-its-usage-for-computing-the-gcm-mode/ | |
*/ | |
#if !defined(MBEDTLS_CONFIG_FILE) | |
#include "mbedtls/config.h" | |
#else | |
#include MBEDTLS_CONFIG_FILE | |
#endif | |
#if defined(MBEDTLS_AESNI_C) | |
#if defined(__has_feature) | |
#if __has_feature(memory_sanitizer) | |
#warning "MBEDTLS_AESNI_C is known to cause spurious error reports with some memory sanitizers as they do not understand the assembly code." | |
#endif | |
#endif | |
#include "mbedtls/aesni.h" | |
#include <string.h> | |
#ifndef asm | |
#define asm __asm | |
#endif | |
#if defined(MBEDTLS_HAVE_X86_64) | |
/* | |
* AES-NI support detection routine | |
*/ | |
int mbedtls_aesni_has_support( unsigned int what ) | |
{ | |
static int done = 0; | |
static unsigned int c = 0; | |
if( ! done ) | |
{ | |
asm( "movl $1, %%eax \n\t" | |
"cpuid \n\t" | |
: "=c" (c) | |
: | |
: "eax", "ebx", "edx" ); | |
done = 1; | |
} | |
return( ( c & what ) != 0 ); | |
} | |
/* | |
* Binutils needs to be at least 2.19 to support AES-NI instructions. | |
* Unfortunately, a lot of users have a lower version now (2014-04). | |
* Emit bytecode directly in order to support "old" version of gas. | |
* | |
* Opcodes from the Intel architecture reference manual, vol. 3. | |
* We always use registers, so we don't need prefixes for memory operands. | |
* Operand macros are in gas order (src, dst) as opposed to Intel order | |
* (dst, src) in order to blend better into the surrounding assembly code. | |
*/ | |
#define AESDEC ".byte 0x66,0x0F,0x38,0xDE," | |
#define AESDECLAST ".byte 0x66,0x0F,0x38,0xDF," | |
#define AESENC ".byte 0x66,0x0F,0x38,0xDC," | |
#define AESENCLAST ".byte 0x66,0x0F,0x38,0xDD," | |
#define AESIMC ".byte 0x66,0x0F,0x38,0xDB," | |
#define AESKEYGENA ".byte 0x66,0x0F,0x3A,0xDF," | |
#define PCLMULQDQ ".byte 0x66,0x0F,0x3A,0x44," | |
#define xmm0_xmm0 "0xC0" | |
#define xmm0_xmm1 "0xC8" | |
#define xmm0_xmm2 "0xD0" | |
#define xmm0_xmm3 "0xD8" | |
#define xmm0_xmm4 "0xE0" | |
#define xmm1_xmm0 "0xC1" | |
#define xmm1_xmm2 "0xD1" | |
/* | |
* AES-NI AES-ECB block en(de)cryption | |
*/ | |
int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx, | |
int mode, | |
const unsigned char input[16], | |
unsigned char output[16] ) | |
{ | |
asm( "movdqu (%3), %%xmm0 \n\t" // load input | |
"movdqu (%1), %%xmm1 \n\t" // load round key 0 | |
"pxor %%xmm1, %%xmm0 \n\t" // round 0 | |
"add $16, %1 \n\t" // point to next round key | |
"subl $1, %0 \n\t" // normal rounds = nr - 1 | |
"test %2, %2 \n\t" // mode? | |
"jz 2f \n\t" // 0 = decrypt | |
"1: \n\t" // encryption loop | |
"movdqu (%1), %%xmm1 \n\t" // load round key | |
AESENC xmm1_xmm0 "\n\t" // do round | |
"add $16, %1 \n\t" // point to next round key | |
"subl $1, %0 \n\t" // loop | |
"jnz 1b \n\t" | |
"movdqu (%1), %%xmm1 \n\t" // load round key | |
AESENCLAST xmm1_xmm0 "\n\t" // last round | |
"jmp 3f \n\t" | |
"2: \n\t" // decryption loop | |
"movdqu (%1), %%xmm1 \n\t" | |
AESDEC xmm1_xmm0 "\n\t" // do round | |
"add $16, %1 \n\t" | |
"subl $1, %0 \n\t" | |
"jnz 2b \n\t" | |
"movdqu (%1), %%xmm1 \n\t" // load round key | |
AESDECLAST xmm1_xmm0 "\n\t" // last round | |
"3: \n\t" | |
"movdqu %%xmm0, (%4) \n\t" // export output | |
: | |
: "r" (ctx->nr), "r" (ctx->rk), "r" (mode), "r" (input), "r" (output) | |
: "memory", "cc", "xmm0", "xmm1" ); | |
return( 0 ); | |
} | |
/* | |
* GCM multiplication: c = a times b in GF(2^128) | |
* Based on [CLMUL-WP] algorithms 1 (with equation 27) and 5. | |
*/ | |
void mbedtls_aesni_gcm_mult( unsigned char c[16], | |
const unsigned char a[16], | |
const unsigned char b[16] ) | |
{ | |
unsigned char aa[16], bb[16], cc[16]; | |
size_t i; | |
/* The inputs are in big-endian order, so byte-reverse them */ | |
for( i = 0; i < 16; i++ ) | |
{ | |
aa[i] = a[15 - i]; | |
bb[i] = b[15 - i]; | |
} | |
asm( "movdqu (%0), %%xmm0 \n\t" // a1:a0 | |
"movdqu (%1), %%xmm1 \n\t" // b1:b0 | |
/* | |
* Caryless multiplication xmm2:xmm1 = xmm0 * xmm1 | |
* using [CLMUL-WP] algorithm 1 (p. 13). | |
*/ | |
"movdqa %%xmm1, %%xmm2 \n\t" // copy of b1:b0 | |
"movdqa %%xmm1, %%xmm3 \n\t" // same | |
"movdqa %%xmm1, %%xmm4 \n\t" // same | |
PCLMULQDQ xmm0_xmm1 ",0x00 \n\t" // a0*b0 = c1:c0 | |
PCLMULQDQ xmm0_xmm2 ",0x11 \n\t" // a1*b1 = d1:d0 | |
PCLMULQDQ xmm0_xmm3 ",0x10 \n\t" // a0*b1 = e1:e0 | |
PCLMULQDQ xmm0_xmm4 ",0x01 \n\t" // a1*b0 = f1:f0 | |
"pxor %%xmm3, %%xmm4 \n\t" // e1+f1:e0+f0 | |
"movdqa %%xmm4, %%xmm3 \n\t" // same | |
"psrldq $8, %%xmm4 \n\t" // 0:e1+f1 | |
"pslldq $8, %%xmm3 \n\t" // e0+f0:0 | |
"pxor %%xmm4, %%xmm2 \n\t" // d1:d0+e1+f1 | |
"pxor %%xmm3, %%xmm1 \n\t" // c1+e0+f1:c0 | |
/* | |
* Now shift the result one bit to the left, | |
* taking advantage of [CLMUL-WP] eq 27 (p. 20) | |
*/ | |
"movdqa %%xmm1, %%xmm3 \n\t" // r1:r0 | |
"movdqa %%xmm2, %%xmm4 \n\t" // r3:r2 | |
"psllq $1, %%xmm1 \n\t" // r1<<1:r0<<1 | |
"psllq $1, %%xmm2 \n\t" // r3<<1:r2<<1 | |
"psrlq $63, %%xmm3 \n\t" // r1>>63:r0>>63 | |
"psrlq $63, %%xmm4 \n\t" // r3>>63:r2>>63 | |
"movdqa %%xmm3, %%xmm5 \n\t" // r1>>63:r0>>63 | |
"pslldq $8, %%xmm3 \n\t" // r0>>63:0 | |
"pslldq $8, %%xmm4 \n\t" // r2>>63:0 | |
"psrldq $8, %%xmm5 \n\t" // 0:r1>>63 | |
"por %%xmm3, %%xmm1 \n\t" // r1<<1|r0>>63:r0<<1 | |
"por %%xmm4, %%xmm2 \n\t" // r3<<1|r2>>62:r2<<1 | |
"por %%xmm5, %%xmm2 \n\t" // r3<<1|r2>>62:r2<<1|r1>>63 | |
/* | |
* Now reduce modulo the GCM polynomial x^128 + x^7 + x^2 + x + 1 | |
* using [CLMUL-WP] algorithm 5 (p. 20). | |
* Currently xmm2:xmm1 holds x3:x2:x1:x0 (already shifted). | |
*/ | |
/* Step 2 (1) */ | |
"movdqa %%xmm1, %%xmm3 \n\t" // x1:x0 | |
"movdqa %%xmm1, %%xmm4 \n\t" // same | |
"movdqa %%xmm1, %%xmm5 \n\t" // same | |
"psllq $63, %%xmm3 \n\t" // x1<<63:x0<<63 = stuff:a | |
"psllq $62, %%xmm4 \n\t" // x1<<62:x0<<62 = stuff:b | |
"psllq $57, %%xmm5 \n\t" // x1<<57:x0<<57 = stuff:c | |
/* Step 2 (2) */ | |
"pxor %%xmm4, %%xmm3 \n\t" // stuff:a+b | |
"pxor %%xmm5, %%xmm3 \n\t" // stuff:a+b+c | |
"pslldq $8, %%xmm3 \n\t" // a+b+c:0 | |
"pxor %%xmm3, %%xmm1 \n\t" // x1+a+b+c:x0 = d:x0 | |
/* Steps 3 and 4 */ | |
"movdqa %%xmm1,%%xmm0 \n\t" // d:x0 | |
"movdqa %%xmm1,%%xmm4 \n\t" // same | |
"movdqa %%xmm1,%%xmm5 \n\t" // same | |
"psrlq $1, %%xmm0 \n\t" // e1:x0>>1 = e1:e0' | |
"psrlq $2, %%xmm4 \n\t" // f1:x0>>2 = f1:f0' | |
"psrlq $7, %%xmm5 \n\t" // g1:x0>>7 = g1:g0' | |
"pxor %%xmm4, %%xmm0 \n\t" // e1+f1:e0'+f0' | |
"pxor %%xmm5, %%xmm0 \n\t" // e1+f1+g1:e0'+f0'+g0' | |
// e0'+f0'+g0' is almost e0+f0+g0, ex\tcept for some missing | |
// bits carried from d. Now get those\t bits back in. | |
"movdqa %%xmm1,%%xmm3 \n\t" // d:x0 | |
"movdqa %%xmm1,%%xmm4 \n\t" // same | |
"movdqa %%xmm1,%%xmm5 \n\t" // same | |
"psllq $63, %%xmm3 \n\t" // d<<63:stuff | |
"psllq $62, %%xmm4 \n\t" // d<<62:stuff | |
"psllq $57, %%xmm5 \n\t" // d<<57:stuff | |
"pxor %%xmm4, %%xmm3 \n\t" // d<<63+d<<62:stuff | |
"pxor %%xmm5, %%xmm3 \n\t" // missing bits of d:stuff | |
"psrldq $8, %%xmm3 \n\t" // 0:missing bits of d | |
"pxor %%xmm3, %%xmm0 \n\t" // e1+f1+g1:e0+f0+g0 | |
"pxor %%xmm1, %%xmm0 \n\t" // h1:h0 | |
"pxor %%xmm2, %%xmm0 \n\t" // x3+h1:x2+h0 | |
"movdqu %%xmm0, (%2) \n\t" // done | |
: | |
: "r" (aa), "r" (bb), "r" (cc) | |
: "memory", "cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5" ); | |
/* Now byte-reverse the outputs */ | |
for( i = 0; i < 16; i++ ) | |
c[i] = cc[15 - i]; | |
return; | |
} | |
/* | |
* Compute decryption round keys from encryption round keys | |
*/ | |
void mbedtls_aesni_inverse_key( unsigned char *invkey, | |
const unsigned char *fwdkey, int nr ) | |
{ | |
unsigned char *ik = invkey; | |
const unsigned char *fk = fwdkey + 16 * nr; | |
memcpy( ik, fk, 16 ); | |
for( fk -= 16, ik += 16; fk > fwdkey; fk -= 16, ik += 16 ) | |
asm( "movdqu (%0), %%xmm0 \n\t" | |
AESIMC xmm0_xmm0 "\n\t" | |
"movdqu %%xmm0, (%1) \n\t" | |
: | |
: "r" (fk), "r" (ik) | |
: "memory", "xmm0" ); | |
memcpy( ik, fk, 16 ); | |
} | |
/* | |
* Key expansion, 128-bit case | |
*/ | |
static void aesni_setkey_enc_128( unsigned char *rk, | |
const unsigned char *key ) | |
{ | |
asm( "movdqu (%1), %%xmm0 \n\t" // copy the original key | |
"movdqu %%xmm0, (%0) \n\t" // as round key 0 | |
"jmp 2f \n\t" // skip auxiliary routine | |
/* | |
* Finish generating the next round key. | |
* | |
* On entry xmm0 is r3:r2:r1:r0 and xmm1 is X:stuff:stuff:stuff | |
* with X = rot( sub( r3 ) ) ^ RCON. | |
* | |
* On exit, xmm0 is r7:r6:r5:r4 | |
* with r4 = X + r0, r5 = r4 + r1, r6 = r5 + r2, r7 = r6 + r3 | |
* and those are written to the round key buffer. | |
*/ | |
"1: \n\t" | |
"pshufd $0xff, %%xmm1, %%xmm1 \n\t" // X:X:X:X | |
"pxor %%xmm0, %%xmm1 \n\t" // X+r3:X+r2:X+r1:r4 | |
"pslldq $4, %%xmm0 \n\t" // r2:r1:r0:0 | |
"pxor %%xmm0, %%xmm1 \n\t" // X+r3+r2:X+r2+r1:r5:r4 | |
"pslldq $4, %%xmm0 \n\t" // etc | |
"pxor %%xmm0, %%xmm1 \n\t" | |
"pslldq $4, %%xmm0 \n\t" | |
"pxor %%xmm1, %%xmm0 \n\t" // update xmm0 for next time! | |
"add $16, %0 \n\t" // point to next round key | |
"movdqu %%xmm0, (%0) \n\t" // write it | |
"ret \n\t" | |
/* Main "loop" */ | |
"2: \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x01 \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x02 \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x04 \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x08 \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x10 \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x20 \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x40 \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x80 \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x1B \n\tcall 1b \n\t" | |
AESKEYGENA xmm0_xmm1 ",0x36 \n\tcall 1b \n\t" | |
: | |
: "r" (rk), "r" (key) | |
: "memory", "cc", "0" ); | |
} | |
/* | |
* Key expansion, 192-bit case | |
*/ | |
static void aesni_setkey_enc_192( unsigned char *rk, | |
const unsigned char *key ) | |
{ | |
asm( "movdqu (%1), %%xmm0 \n\t" // copy original round key | |
"movdqu %%xmm0, (%0) \n\t" | |
"add $16, %0 \n\t" | |
"movq 16(%1), %%xmm1 \n\t" | |
"movq %%xmm1, (%0) \n\t" | |
"add $8, %0 \n\t" | |
"jmp 2f \n\t" // skip auxiliary routine | |
/* | |
* Finish generating the next 6 quarter-keys. | |
* | |
* On entry xmm0 is r3:r2:r1:r0, xmm1 is stuff:stuff:r5:r4 | |
* and xmm2 is stuff:stuff:X:stuff with X = rot( sub( r3 ) ) ^ RCON. | |
* | |
* On exit, xmm0 is r9:r8:r7:r6 and xmm1 is stuff:stuff:r11:r10 | |
* and those are written to the round key buffer. | |
*/ | |
"1: \n\t" | |
"pshufd $0x55, %%xmm2, %%xmm2 \n\t" // X:X:X:X | |
"pxor %%xmm0, %%xmm2 \n\t" // X+r3:X+r2:X+r1:r4 | |
"pslldq $4, %%xmm0 \n\t" // etc | |
"pxor %%xmm0, %%xmm2 \n\t" | |
"pslldq $4, %%xmm0 \n\t" | |
"pxor %%xmm0, %%xmm2 \n\t" | |
"pslldq $4, %%xmm0 \n\t" | |
"pxor %%xmm2, %%xmm0 \n\t" // update xmm0 = r9:r8:r7:r6 | |
"movdqu %%xmm0, (%0) \n\t" | |
"add $16, %0 \n\t" | |
"pshufd $0xff, %%xmm0, %%xmm2 \n\t" // r9:r9:r9:r9 | |
"pxor %%xmm1, %%xmm2 \n\t" // stuff:stuff:r9+r5:r10 | |
"pslldq $4, %%xmm1 \n\t" // r2:r1:r0:0 | |
"pxor %%xmm2, %%xmm1 \n\t" // xmm1 = stuff:stuff:r11:r10 | |
"movq %%xmm1, (%0) \n\t" | |
"add $8, %0 \n\t" | |
"ret \n\t" | |
"2: \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x01 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x02 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x04 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x08 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x10 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x20 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x40 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x80 \n\tcall 1b \n\t" | |
: | |
: "r" (rk), "r" (key) | |
: "memory", "cc", "0" ); | |
} | |
/* | |
* Key expansion, 256-bit case | |
*/ | |
static void aesni_setkey_enc_256( unsigned char *rk, | |
const unsigned char *key ) | |
{ | |
asm( "movdqu (%1), %%xmm0 \n\t" | |
"movdqu %%xmm0, (%0) \n\t" | |
"add $16, %0 \n\t" | |
"movdqu 16(%1), %%xmm1 \n\t" | |
"movdqu %%xmm1, (%0) \n\t" | |
"jmp 2f \n\t" // skip auxiliary routine | |
/* | |
* Finish generating the next two round keys. | |
* | |
* On entry xmm0 is r3:r2:r1:r0, xmm1 is r7:r6:r5:r4 and | |
* xmm2 is X:stuff:stuff:stuff with X = rot( sub( r7 )) ^ RCON | |
* | |
* On exit, xmm0 is r11:r10:r9:r8 and xmm1 is r15:r14:r13:r12 | |
* and those have been written to the output buffer. | |
*/ | |
"1: \n\t" | |
"pshufd $0xff, %%xmm2, %%xmm2 \n\t" | |
"pxor %%xmm0, %%xmm2 \n\t" | |
"pslldq $4, %%xmm0 \n\t" | |
"pxor %%xmm0, %%xmm2 \n\t" | |
"pslldq $4, %%xmm0 \n\t" | |
"pxor %%xmm0, %%xmm2 \n\t" | |
"pslldq $4, %%xmm0 \n\t" | |
"pxor %%xmm2, %%xmm0 \n\t" | |
"add $16, %0 \n\t" | |
"movdqu %%xmm0, (%0) \n\t" | |
/* Set xmm2 to stuff:Y:stuff:stuff with Y = subword( r11 ) | |
* and proceed to generate next round key from there */ | |
AESKEYGENA xmm0_xmm2 ",0x00 \n\t" | |
"pshufd $0xaa, %%xmm2, %%xmm2 \n\t" | |
"pxor %%xmm1, %%xmm2 \n\t" | |
"pslldq $4, %%xmm1 \n\t" | |
"pxor %%xmm1, %%xmm2 \n\t" | |
"pslldq $4, %%xmm1 \n\t" | |
"pxor %%xmm1, %%xmm2 \n\t" | |
"pslldq $4, %%xmm1 \n\t" | |
"pxor %%xmm2, %%xmm1 \n\t" | |
"add $16, %0 \n\t" | |
"movdqu %%xmm1, (%0) \n\t" | |
"ret \n\t" | |
/* | |
* Main "loop" - Generating one more key than necessary, | |
* see definition of mbedtls_aes_context.buf | |
*/ | |
"2: \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x01 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x02 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x04 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x08 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x10 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x20 \n\tcall 1b \n\t" | |
AESKEYGENA xmm1_xmm2 ",0x40 \n\tcall 1b \n\t" | |
: | |
: "r" (rk), "r" (key) | |
: "memory", "cc", "0" ); | |
} | |
/* | |
* Key expansion, wrapper | |
*/ | |
int mbedtls_aesni_setkey_enc( unsigned char *rk, | |
const unsigned char *key, | |
size_t bits ) | |
{ | |
switch( bits ) | |
{ | |
case 128: aesni_setkey_enc_128( rk, key ); break; | |
case 192: aesni_setkey_enc_192( rk, key ); break; | |
case 256: aesni_setkey_enc_256( rk, key ); break; | |
default : return( MBEDTLS_ERR_AES_INVALID_KEY_LENGTH ); | |
} | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_HAVE_X86_64 */ | |
#endif /* MBEDTLS_AESNI_C */ |