| /* |
| * AES-NI support functions |
| * |
| * Copyright The Mbed TLS Contributors |
| * 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. |
| */ |
| |
| /* |
| * [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/ |
| */ |
| |
| #include "common.h" |
| |
| #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 "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 */ |
