[398] | 1 | /*
|
---|
| 2 | * AES-NI support functions
|
---|
| 3 | *
|
---|
| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
---|
| 5 | * SPDX-License-Identifier: Apache-2.0
|
---|
| 6 | *
|
---|
| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
|
---|
| 8 | * not use this file except in compliance with the License.
|
---|
| 9 | * You may obtain a copy of the License at
|
---|
| 10 | *
|
---|
| 11 | * http://www.apache.org/licenses/LICENSE-2.0
|
---|
| 12 | *
|
---|
| 13 | * Unless required by applicable law or agreed to in writing, software
|
---|
| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
---|
| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
---|
| 16 | * See the License for the specific language governing permissions and
|
---|
| 17 | * limitations under the License.
|
---|
| 18 | *
|
---|
| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
|
---|
| 20 | */
|
---|
| 21 |
|
---|
| 22 | /*
|
---|
| 23 | * [AES-WP] http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set
|
---|
| 24 | * [CLMUL-WP] http://software.intel.com/en-us/articles/intel-carry-less-multiplication-instruction-and-its-usage-for-computing-the-gcm-mode/
|
---|
| 25 | */
|
---|
| 26 |
|
---|
| 27 | #if !defined(MBEDTLS_CONFIG_FILE)
|
---|
| 28 | #include "mbedtls/config.h"
|
---|
| 29 | #else
|
---|
| 30 | #include MBEDTLS_CONFIG_FILE
|
---|
| 31 | #endif
|
---|
| 32 |
|
---|
| 33 | #if defined(MBEDTLS_AESNI_C)
|
---|
| 34 |
|
---|
| 35 | #if defined(__has_feature)
|
---|
| 36 | #if __has_feature(memory_sanitizer)
|
---|
| 37 | #warning "MBEDTLS_AESNI_C is known to cause spurious error reports with some memory sanitizers as they do not understand the assembly code."
|
---|
| 38 | #endif
|
---|
| 39 | #endif
|
---|
| 40 |
|
---|
| 41 | #include "mbedtls/aesni.h"
|
---|
| 42 |
|
---|
| 43 | #include <string.h>
|
---|
| 44 |
|
---|
| 45 | #ifndef asm
|
---|
| 46 | #define asm __asm
|
---|
| 47 | #endif
|
---|
| 48 |
|
---|
| 49 | #if defined(MBEDTLS_HAVE_X86_64)
|
---|
| 50 |
|
---|
| 51 | /*
|
---|
| 52 | * AES-NI support detection routine
|
---|
| 53 | */
|
---|
| 54 | int mbedtls_aesni_has_support( unsigned int what )
|
---|
| 55 | {
|
---|
| 56 | static int done = 0;
|
---|
| 57 | static unsigned int c = 0;
|
---|
| 58 |
|
---|
| 59 | if( ! done )
|
---|
| 60 | {
|
---|
| 61 | asm( "movl $1, %%eax \n\t"
|
---|
| 62 | "cpuid \n\t"
|
---|
| 63 | : "=c" (c)
|
---|
| 64 | :
|
---|
| 65 | : "eax", "ebx", "edx" );
|
---|
| 66 | done = 1;
|
---|
| 67 | }
|
---|
| 68 |
|
---|
| 69 | return( ( c & what ) != 0 );
|
---|
| 70 | }
|
---|
| 71 |
|
---|
| 72 | /*
|
---|
| 73 | * Binutils needs to be at least 2.19 to support AES-NI instructions.
|
---|
| 74 | * Unfortunately, a lot of users have a lower version now (2014-04).
|
---|
| 75 | * Emit bytecode directly in order to support "old" version of gas.
|
---|
| 76 | *
|
---|
| 77 | * Opcodes from the Intel architecture reference manual, vol. 3.
|
---|
| 78 | * We always use registers, so we don't need prefixes for memory operands.
|
---|
| 79 | * Operand macros are in gas order (src, dst) as opposed to Intel order
|
---|
| 80 | * (dst, src) in order to blend better into the surrounding assembly code.
|
---|
| 81 | */
|
---|
| 82 | #define AESDEC ".byte 0x66,0x0F,0x38,0xDE,"
|
---|
| 83 | #define AESDECLAST ".byte 0x66,0x0F,0x38,0xDF,"
|
---|
| 84 | #define AESENC ".byte 0x66,0x0F,0x38,0xDC,"
|
---|
| 85 | #define AESENCLAST ".byte 0x66,0x0F,0x38,0xDD,"
|
---|
| 86 | #define AESIMC ".byte 0x66,0x0F,0x38,0xDB,"
|
---|
| 87 | #define AESKEYGENA ".byte 0x66,0x0F,0x3A,0xDF,"
|
---|
| 88 | #define PCLMULQDQ ".byte 0x66,0x0F,0x3A,0x44,"
|
---|
| 89 |
|
---|
| 90 | #define xmm0_xmm0 "0xC0"
|
---|
| 91 | #define xmm0_xmm1 "0xC8"
|
---|
| 92 | #define xmm0_xmm2 "0xD0"
|
---|
| 93 | #define xmm0_xmm3 "0xD8"
|
---|
| 94 | #define xmm0_xmm4 "0xE0"
|
---|
| 95 | #define xmm1_xmm0 "0xC1"
|
---|
| 96 | #define xmm1_xmm2 "0xD1"
|
---|
| 97 |
|
---|
| 98 | /*
|
---|
| 99 | * AES-NI AES-ECB block en(de)cryption
|
---|
| 100 | */
|
---|
| 101 | int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx,
|
---|
| 102 | int mode,
|
---|
| 103 | const unsigned char input[16],
|
---|
| 104 | unsigned char output[16] )
|
---|
| 105 | {
|
---|
| 106 | asm( "movdqu (%3), %%xmm0 \n\t" // load input
|
---|
| 107 | "movdqu (%1), %%xmm1 \n\t" // load round key 0
|
---|
| 108 | "pxor %%xmm1, %%xmm0 \n\t" // round 0
|
---|
| 109 | "add $16, %1 \n\t" // point to next round key
|
---|
| 110 | "subl $1, %0 \n\t" // normal rounds = nr - 1
|
---|
| 111 | "test %2, %2 \n\t" // mode?
|
---|
| 112 | "jz 2f \n\t" // 0 = decrypt
|
---|
| 113 |
|
---|
| 114 | "1: \n\t" // encryption loop
|
---|
| 115 | "movdqu (%1), %%xmm1 \n\t" // load round key
|
---|
| 116 | AESENC xmm1_xmm0 "\n\t" // do round
|
---|
| 117 | "add $16, %1 \n\t" // point to next round key
|
---|
| 118 | "subl $1, %0 \n\t" // loop
|
---|
| 119 | "jnz 1b \n\t"
|
---|
| 120 | "movdqu (%1), %%xmm1 \n\t" // load round key
|
---|
| 121 | AESENCLAST xmm1_xmm0 "\n\t" // last round
|
---|
| 122 | "jmp 3f \n\t"
|
---|
| 123 |
|
---|
| 124 | "2: \n\t" // decryption loop
|
---|
| 125 | "movdqu (%1), %%xmm1 \n\t"
|
---|
| 126 | AESDEC xmm1_xmm0 "\n\t" // do round
|
---|
| 127 | "add $16, %1 \n\t"
|
---|
| 128 | "subl $1, %0 \n\t"
|
---|
| 129 | "jnz 2b \n\t"
|
---|
| 130 | "movdqu (%1), %%xmm1 \n\t" // load round key
|
---|
| 131 | AESDECLAST xmm1_xmm0 "\n\t" // last round
|
---|
| 132 |
|
---|
| 133 | "3: \n\t"
|
---|
| 134 | "movdqu %%xmm0, (%4) \n\t" // export output
|
---|
| 135 | :
|
---|
| 136 | : "r" (ctx->nr), "r" (ctx->rk), "r" (mode), "r" (input), "r" (output)
|
---|
| 137 | : "memory", "cc", "xmm0", "xmm1" );
|
---|
| 138 |
|
---|
| 139 |
|
---|
| 140 | return( 0 );
|
---|
| 141 | }
|
---|
| 142 |
|
---|
| 143 | /*
|
---|
| 144 | * GCM multiplication: c = a times b in GF(2^128)
|
---|
| 145 | * Based on [CLMUL-WP] algorithms 1 (with equation 27) and 5.
|
---|
| 146 | */
|
---|
| 147 | void mbedtls_aesni_gcm_mult( unsigned char c[16],
|
---|
| 148 | const unsigned char a[16],
|
---|
| 149 | const unsigned char b[16] )
|
---|
| 150 | {
|
---|
| 151 | unsigned char aa[16], bb[16], cc[16];
|
---|
| 152 | size_t i;
|
---|
| 153 |
|
---|
| 154 | /* The inputs are in big-endian order, so byte-reverse them */
|
---|
| 155 | for( i = 0; i < 16; i++ )
|
---|
| 156 | {
|
---|
| 157 | aa[i] = a[15 - i];
|
---|
| 158 | bb[i] = b[15 - i];
|
---|
| 159 | }
|
---|
| 160 |
|
---|
| 161 | asm( "movdqu (%0), %%xmm0 \n\t" // a1:a0
|
---|
| 162 | "movdqu (%1), %%xmm1 \n\t" // b1:b0
|
---|
| 163 |
|
---|
| 164 | /*
|
---|
| 165 | * Caryless multiplication xmm2:xmm1 = xmm0 * xmm1
|
---|
| 166 | * using [CLMUL-WP] algorithm 1 (p. 13).
|
---|
| 167 | */
|
---|
| 168 | "movdqa %%xmm1, %%xmm2 \n\t" // copy of b1:b0
|
---|
| 169 | "movdqa %%xmm1, %%xmm3 \n\t" // same
|
---|
| 170 | "movdqa %%xmm1, %%xmm4 \n\t" // same
|
---|
| 171 | PCLMULQDQ xmm0_xmm1 ",0x00 \n\t" // a0*b0 = c1:c0
|
---|
| 172 | PCLMULQDQ xmm0_xmm2 ",0x11 \n\t" // a1*b1 = d1:d0
|
---|
| 173 | PCLMULQDQ xmm0_xmm3 ",0x10 \n\t" // a0*b1 = e1:e0
|
---|
| 174 | PCLMULQDQ xmm0_xmm4 ",0x01 \n\t" // a1*b0 = f1:f0
|
---|
| 175 | "pxor %%xmm3, %%xmm4 \n\t" // e1+f1:e0+f0
|
---|
| 176 | "movdqa %%xmm4, %%xmm3 \n\t" // same
|
---|
| 177 | "psrldq $8, %%xmm4 \n\t" // 0:e1+f1
|
---|
| 178 | "pslldq $8, %%xmm3 \n\t" // e0+f0:0
|
---|
| 179 | "pxor %%xmm4, %%xmm2 \n\t" // d1:d0+e1+f1
|
---|
| 180 | "pxor %%xmm3, %%xmm1 \n\t" // c1+e0+f1:c0
|
---|
| 181 |
|
---|
| 182 | /*
|
---|
| 183 | * Now shift the result one bit to the left,
|
---|
| 184 | * taking advantage of [CLMUL-WP] eq 27 (p. 20)
|
---|
| 185 | */
|
---|
| 186 | "movdqa %%xmm1, %%xmm3 \n\t" // r1:r0
|
---|
| 187 | "movdqa %%xmm2, %%xmm4 \n\t" // r3:r2
|
---|
| 188 | "psllq $1, %%xmm1 \n\t" // r1<<1:r0<<1
|
---|
| 189 | "psllq $1, %%xmm2 \n\t" // r3<<1:r2<<1
|
---|
| 190 | "psrlq $63, %%xmm3 \n\t" // r1>>63:r0>>63
|
---|
| 191 | "psrlq $63, %%xmm4 \n\t" // r3>>63:r2>>63
|
---|
| 192 | "movdqa %%xmm3, %%xmm5 \n\t" // r1>>63:r0>>63
|
---|
| 193 | "pslldq $8, %%xmm3 \n\t" // r0>>63:0
|
---|
| 194 | "pslldq $8, %%xmm4 \n\t" // r2>>63:0
|
---|
| 195 | "psrldq $8, %%xmm5 \n\t" // 0:r1>>63
|
---|
| 196 | "por %%xmm3, %%xmm1 \n\t" // r1<<1|r0>>63:r0<<1
|
---|
| 197 | "por %%xmm4, %%xmm2 \n\t" // r3<<1|r2>>62:r2<<1
|
---|
| 198 | "por %%xmm5, %%xmm2 \n\t" // r3<<1|r2>>62:r2<<1|r1>>63
|
---|
| 199 |
|
---|
| 200 | /*
|
---|
| 201 | * Now reduce modulo the GCM polynomial x^128 + x^7 + x^2 + x + 1
|
---|
| 202 | * using [CLMUL-WP] algorithm 5 (p. 20).
|
---|
| 203 | * Currently xmm2:xmm1 holds x3:x2:x1:x0 (already shifted).
|
---|
| 204 | */
|
---|
| 205 | /* Step 2 (1) */
|
---|
| 206 | "movdqa %%xmm1, %%xmm3 \n\t" // x1:x0
|
---|
| 207 | "movdqa %%xmm1, %%xmm4 \n\t" // same
|
---|
| 208 | "movdqa %%xmm1, %%xmm5 \n\t" // same
|
---|
| 209 | "psllq $63, %%xmm3 \n\t" // x1<<63:x0<<63 = stuff:a
|
---|
| 210 | "psllq $62, %%xmm4 \n\t" // x1<<62:x0<<62 = stuff:b
|
---|
| 211 | "psllq $57, %%xmm5 \n\t" // x1<<57:x0<<57 = stuff:c
|
---|
| 212 |
|
---|
| 213 | /* Step 2 (2) */
|
---|
| 214 | "pxor %%xmm4, %%xmm3 \n\t" // stuff:a+b
|
---|
| 215 | "pxor %%xmm5, %%xmm3 \n\t" // stuff:a+b+c
|
---|
| 216 | "pslldq $8, %%xmm3 \n\t" // a+b+c:0
|
---|
| 217 | "pxor %%xmm3, %%xmm1 \n\t" // x1+a+b+c:x0 = d:x0
|
---|
| 218 |
|
---|
| 219 | /* Steps 3 and 4 */
|
---|
| 220 | "movdqa %%xmm1,%%xmm0 \n\t" // d:x0
|
---|
| 221 | "movdqa %%xmm1,%%xmm4 \n\t" // same
|
---|
| 222 | "movdqa %%xmm1,%%xmm5 \n\t" // same
|
---|
| 223 | "psrlq $1, %%xmm0 \n\t" // e1:x0>>1 = e1:e0'
|
---|
| 224 | "psrlq $2, %%xmm4 \n\t" // f1:x0>>2 = f1:f0'
|
---|
| 225 | "psrlq $7, %%xmm5 \n\t" // g1:x0>>7 = g1:g0'
|
---|
| 226 | "pxor %%xmm4, %%xmm0 \n\t" // e1+f1:e0'+f0'
|
---|
| 227 | "pxor %%xmm5, %%xmm0 \n\t" // e1+f1+g1:e0'+f0'+g0'
|
---|
| 228 | // e0'+f0'+g0' is almost e0+f0+g0, ex\tcept for some missing
|
---|
| 229 | // bits carried from d. Now get those\t bits back in.
|
---|
| 230 | "movdqa %%xmm1,%%xmm3 \n\t" // d:x0
|
---|
| 231 | "movdqa %%xmm1,%%xmm4 \n\t" // same
|
---|
| 232 | "movdqa %%xmm1,%%xmm5 \n\t" // same
|
---|
| 233 | "psllq $63, %%xmm3 \n\t" // d<<63:stuff
|
---|
| 234 | "psllq $62, %%xmm4 \n\t" // d<<62:stuff
|
---|
| 235 | "psllq $57, %%xmm5 \n\t" // d<<57:stuff
|
---|
| 236 | "pxor %%xmm4, %%xmm3 \n\t" // d<<63+d<<62:stuff
|
---|
| 237 | "pxor %%xmm5, %%xmm3 \n\t" // missing bits of d:stuff
|
---|
| 238 | "psrldq $8, %%xmm3 \n\t" // 0:missing bits of d
|
---|
| 239 | "pxor %%xmm3, %%xmm0 \n\t" // e1+f1+g1:e0+f0+g0
|
---|
| 240 | "pxor %%xmm1, %%xmm0 \n\t" // h1:h0
|
---|
| 241 | "pxor %%xmm2, %%xmm0 \n\t" // x3+h1:x2+h0
|
---|
| 242 |
|
---|
| 243 | "movdqu %%xmm0, (%2) \n\t" // done
|
---|
| 244 | :
|
---|
| 245 | : "r" (aa), "r" (bb), "r" (cc)
|
---|
| 246 | : "memory", "cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5" );
|
---|
| 247 |
|
---|
| 248 | /* Now byte-reverse the outputs */
|
---|
| 249 | for( i = 0; i < 16; i++ )
|
---|
| 250 | c[i] = cc[15 - i];
|
---|
| 251 |
|
---|
| 252 | return;
|
---|
| 253 | }
|
---|
| 254 |
|
---|
| 255 | /*
|
---|
| 256 | * Compute decryption round keys from encryption round keys
|
---|
| 257 | */
|
---|
| 258 | void mbedtls_aesni_inverse_key( unsigned char *invkey,
|
---|
| 259 | const unsigned char *fwdkey, int nr )
|
---|
| 260 | {
|
---|
| 261 | unsigned char *ik = invkey;
|
---|
| 262 | const unsigned char *fk = fwdkey + 16 * nr;
|
---|
| 263 |
|
---|
| 264 | memcpy( ik, fk, 16 );
|
---|
| 265 |
|
---|
| 266 | for( fk -= 16, ik += 16; fk > fwdkey; fk -= 16, ik += 16 )
|
---|
| 267 | asm( "movdqu (%0), %%xmm0 \n\t"
|
---|
| 268 | AESIMC xmm0_xmm0 "\n\t"
|
---|
| 269 | "movdqu %%xmm0, (%1) \n\t"
|
---|
| 270 | :
|
---|
| 271 | : "r" (fk), "r" (ik)
|
---|
| 272 | : "memory", "xmm0" );
|
---|
| 273 |
|
---|
| 274 | memcpy( ik, fk, 16 );
|
---|
| 275 | }
|
---|
| 276 |
|
---|
| 277 | /*
|
---|
| 278 | * Key expansion, 128-bit case
|
---|
| 279 | */
|
---|
| 280 | static void aesni_setkey_enc_128( unsigned char *rk,
|
---|
| 281 | const unsigned char *key )
|
---|
| 282 | {
|
---|
| 283 | asm( "movdqu (%1), %%xmm0 \n\t" // copy the original key
|
---|
| 284 | "movdqu %%xmm0, (%0) \n\t" // as round key 0
|
---|
| 285 | "jmp 2f \n\t" // skip auxiliary routine
|
---|
| 286 |
|
---|
| 287 | /*
|
---|
| 288 | * Finish generating the next round key.
|
---|
| 289 | *
|
---|
| 290 | * On entry xmm0 is r3:r2:r1:r0 and xmm1 is X:stuff:stuff:stuff
|
---|
| 291 | * with X = rot( sub( r3 ) ) ^ RCON.
|
---|
| 292 | *
|
---|
| 293 | * On exit, xmm0 is r7:r6:r5:r4
|
---|
| 294 | * with r4 = X + r0, r5 = r4 + r1, r6 = r5 + r2, r7 = r6 + r3
|
---|
| 295 | * and those are written to the round key buffer.
|
---|
| 296 | */
|
---|
| 297 | "1: \n\t"
|
---|
| 298 | "pshufd $0xff, %%xmm1, %%xmm1 \n\t" // X:X:X:X
|
---|
| 299 | "pxor %%xmm0, %%xmm1 \n\t" // X+r3:X+r2:X+r1:r4
|
---|
| 300 | "pslldq $4, %%xmm0 \n\t" // r2:r1:r0:0
|
---|
| 301 | "pxor %%xmm0, %%xmm1 \n\t" // X+r3+r2:X+r2+r1:r5:r4
|
---|
| 302 | "pslldq $4, %%xmm0 \n\t" // etc
|
---|
| 303 | "pxor %%xmm0, %%xmm1 \n\t"
|
---|
| 304 | "pslldq $4, %%xmm0 \n\t"
|
---|
| 305 | "pxor %%xmm1, %%xmm0 \n\t" // update xmm0 for next time!
|
---|
| 306 | "add $16, %0 \n\t" // point to next round key
|
---|
| 307 | "movdqu %%xmm0, (%0) \n\t" // write it
|
---|
| 308 | "ret \n\t"
|
---|
| 309 |
|
---|
| 310 | /* Main "loop" */
|
---|
| 311 | "2: \n\t"
|
---|
| 312 | AESKEYGENA xmm0_xmm1 ",0x01 \n\tcall 1b \n\t"
|
---|
| 313 | AESKEYGENA xmm0_xmm1 ",0x02 \n\tcall 1b \n\t"
|
---|
| 314 | AESKEYGENA xmm0_xmm1 ",0x04 \n\tcall 1b \n\t"
|
---|
| 315 | AESKEYGENA xmm0_xmm1 ",0x08 \n\tcall 1b \n\t"
|
---|
| 316 | AESKEYGENA xmm0_xmm1 ",0x10 \n\tcall 1b \n\t"
|
---|
| 317 | AESKEYGENA xmm0_xmm1 ",0x20 \n\tcall 1b \n\t"
|
---|
| 318 | AESKEYGENA xmm0_xmm1 ",0x40 \n\tcall 1b \n\t"
|
---|
| 319 | AESKEYGENA xmm0_xmm1 ",0x80 \n\tcall 1b \n\t"
|
---|
| 320 | AESKEYGENA xmm0_xmm1 ",0x1B \n\tcall 1b \n\t"
|
---|
| 321 | AESKEYGENA xmm0_xmm1 ",0x36 \n\tcall 1b \n\t"
|
---|
| 322 | :
|
---|
| 323 | : "r" (rk), "r" (key)
|
---|
| 324 | : "memory", "cc", "0" );
|
---|
| 325 | }
|
---|
| 326 |
|
---|
| 327 | /*
|
---|
| 328 | * Key expansion, 192-bit case
|
---|
| 329 | */
|
---|
| 330 | static void aesni_setkey_enc_192( unsigned char *rk,
|
---|
| 331 | const unsigned char *key )
|
---|
| 332 | {
|
---|
| 333 | asm( "movdqu (%1), %%xmm0 \n\t" // copy original round key
|
---|
| 334 | "movdqu %%xmm0, (%0) \n\t"
|
---|
| 335 | "add $16, %0 \n\t"
|
---|
| 336 | "movq 16(%1), %%xmm1 \n\t"
|
---|
| 337 | "movq %%xmm1, (%0) \n\t"
|
---|
| 338 | "add $8, %0 \n\t"
|
---|
| 339 | "jmp 2f \n\t" // skip auxiliary routine
|
---|
| 340 |
|
---|
| 341 | /*
|
---|
| 342 | * Finish generating the next 6 quarter-keys.
|
---|
| 343 | *
|
---|
| 344 | * On entry xmm0 is r3:r2:r1:r0, xmm1 is stuff:stuff:r5:r4
|
---|
| 345 | * and xmm2 is stuff:stuff:X:stuff with X = rot( sub( r3 ) ) ^ RCON.
|
---|
| 346 | *
|
---|
| 347 | * On exit, xmm0 is r9:r8:r7:r6 and xmm1 is stuff:stuff:r11:r10
|
---|
| 348 | * and those are written to the round key buffer.
|
---|
| 349 | */
|
---|
| 350 | "1: \n\t"
|
---|
| 351 | "pshufd $0x55, %%xmm2, %%xmm2 \n\t" // X:X:X:X
|
---|
| 352 | "pxor %%xmm0, %%xmm2 \n\t" // X+r3:X+r2:X+r1:r4
|
---|
| 353 | "pslldq $4, %%xmm0 \n\t" // etc
|
---|
| 354 | "pxor %%xmm0, %%xmm2 \n\t"
|
---|
| 355 | "pslldq $4, %%xmm0 \n\t"
|
---|
| 356 | "pxor %%xmm0, %%xmm2 \n\t"
|
---|
| 357 | "pslldq $4, %%xmm0 \n\t"
|
---|
| 358 | "pxor %%xmm2, %%xmm0 \n\t" // update xmm0 = r9:r8:r7:r6
|
---|
| 359 | "movdqu %%xmm0, (%0) \n\t"
|
---|
| 360 | "add $16, %0 \n\t"
|
---|
| 361 | "pshufd $0xff, %%xmm0, %%xmm2 \n\t" // r9:r9:r9:r9
|
---|
| 362 | "pxor %%xmm1, %%xmm2 \n\t" // stuff:stuff:r9+r5:r10
|
---|
| 363 | "pslldq $4, %%xmm1 \n\t" // r2:r1:r0:0
|
---|
| 364 | "pxor %%xmm2, %%xmm1 \n\t" // xmm1 = stuff:stuff:r11:r10
|
---|
| 365 | "movq %%xmm1, (%0) \n\t"
|
---|
| 366 | "add $8, %0 \n\t"
|
---|
| 367 | "ret \n\t"
|
---|
| 368 |
|
---|
| 369 | "2: \n\t"
|
---|
| 370 | AESKEYGENA xmm1_xmm2 ",0x01 \n\tcall 1b \n\t"
|
---|
| 371 | AESKEYGENA xmm1_xmm2 ",0x02 \n\tcall 1b \n\t"
|
---|
| 372 | AESKEYGENA xmm1_xmm2 ",0x04 \n\tcall 1b \n\t"
|
---|
| 373 | AESKEYGENA xmm1_xmm2 ",0x08 \n\tcall 1b \n\t"
|
---|
| 374 | AESKEYGENA xmm1_xmm2 ",0x10 \n\tcall 1b \n\t"
|
---|
| 375 | AESKEYGENA xmm1_xmm2 ",0x20 \n\tcall 1b \n\t"
|
---|
| 376 | AESKEYGENA xmm1_xmm2 ",0x40 \n\tcall 1b \n\t"
|
---|
| 377 | AESKEYGENA xmm1_xmm2 ",0x80 \n\tcall 1b \n\t"
|
---|
| 378 |
|
---|
| 379 | :
|
---|
| 380 | : "r" (rk), "r" (key)
|
---|
| 381 | : "memory", "cc", "0" );
|
---|
| 382 | }
|
---|
| 383 |
|
---|
| 384 | /*
|
---|
| 385 | * Key expansion, 256-bit case
|
---|
| 386 | */
|
---|
| 387 | static void aesni_setkey_enc_256( unsigned char *rk,
|
---|
| 388 | const unsigned char *key )
|
---|
| 389 | {
|
---|
| 390 | asm( "movdqu (%1), %%xmm0 \n\t"
|
---|
| 391 | "movdqu %%xmm0, (%0) \n\t"
|
---|
| 392 | "add $16, %0 \n\t"
|
---|
| 393 | "movdqu 16(%1), %%xmm1 \n\t"
|
---|
| 394 | "movdqu %%xmm1, (%0) \n\t"
|
---|
| 395 | "jmp 2f \n\t" // skip auxiliary routine
|
---|
| 396 |
|
---|
| 397 | /*
|
---|
| 398 | * Finish generating the next two round keys.
|
---|
| 399 | *
|
---|
| 400 | * On entry xmm0 is r3:r2:r1:r0, xmm1 is r7:r6:r5:r4 and
|
---|
| 401 | * xmm2 is X:stuff:stuff:stuff with X = rot( sub( r7 )) ^ RCON
|
---|
| 402 | *
|
---|
| 403 | * On exit, xmm0 is r11:r10:r9:r8 and xmm1 is r15:r14:r13:r12
|
---|
| 404 | * and those have been written to the output buffer.
|
---|
| 405 | */
|
---|
| 406 | "1: \n\t"
|
---|
| 407 | "pshufd $0xff, %%xmm2, %%xmm2 \n\t"
|
---|
| 408 | "pxor %%xmm0, %%xmm2 \n\t"
|
---|
| 409 | "pslldq $4, %%xmm0 \n\t"
|
---|
| 410 | "pxor %%xmm0, %%xmm2 \n\t"
|
---|
| 411 | "pslldq $4, %%xmm0 \n\t"
|
---|
| 412 | "pxor %%xmm0, %%xmm2 \n\t"
|
---|
| 413 | "pslldq $4, %%xmm0 \n\t"
|
---|
| 414 | "pxor %%xmm2, %%xmm0 \n\t"
|
---|
| 415 | "add $16, %0 \n\t"
|
---|
| 416 | "movdqu %%xmm0, (%0) \n\t"
|
---|
| 417 |
|
---|
| 418 | /* Set xmm2 to stuff:Y:stuff:stuff with Y = subword( r11 )
|
---|
| 419 | * and proceed to generate next round key from there */
|
---|
| 420 | AESKEYGENA xmm0_xmm2 ",0x00 \n\t"
|
---|
| 421 | "pshufd $0xaa, %%xmm2, %%xmm2 \n\t"
|
---|
| 422 | "pxor %%xmm1, %%xmm2 \n\t"
|
---|
| 423 | "pslldq $4, %%xmm1 \n\t"
|
---|
| 424 | "pxor %%xmm1, %%xmm2 \n\t"
|
---|
| 425 | "pslldq $4, %%xmm1 \n\t"
|
---|
| 426 | "pxor %%xmm1, %%xmm2 \n\t"
|
---|
| 427 | "pslldq $4, %%xmm1 \n\t"
|
---|
| 428 | "pxor %%xmm2, %%xmm1 \n\t"
|
---|
| 429 | "add $16, %0 \n\t"
|
---|
| 430 | "movdqu %%xmm1, (%0) \n\t"
|
---|
| 431 | "ret \n\t"
|
---|
| 432 |
|
---|
| 433 | /*
|
---|
| 434 | * Main "loop" - Generating one more key than necessary,
|
---|
| 435 | * see definition of mbedtls_aes_context.buf
|
---|
| 436 | */
|
---|
| 437 | "2: \n\t"
|
---|
| 438 | AESKEYGENA xmm1_xmm2 ",0x01 \n\tcall 1b \n\t"
|
---|
| 439 | AESKEYGENA xmm1_xmm2 ",0x02 \n\tcall 1b \n\t"
|
---|
| 440 | AESKEYGENA xmm1_xmm2 ",0x04 \n\tcall 1b \n\t"
|
---|
| 441 | AESKEYGENA xmm1_xmm2 ",0x08 \n\tcall 1b \n\t"
|
---|
| 442 | AESKEYGENA xmm1_xmm2 ",0x10 \n\tcall 1b \n\t"
|
---|
| 443 | AESKEYGENA xmm1_xmm2 ",0x20 \n\tcall 1b \n\t"
|
---|
| 444 | AESKEYGENA xmm1_xmm2 ",0x40 \n\tcall 1b \n\t"
|
---|
| 445 | :
|
---|
| 446 | : "r" (rk), "r" (key)
|
---|
| 447 | : "memory", "cc", "0" );
|
---|
| 448 | }
|
---|
| 449 |
|
---|
| 450 | /*
|
---|
| 451 | * Key expansion, wrapper
|
---|
| 452 | */
|
---|
| 453 | int mbedtls_aesni_setkey_enc( unsigned char *rk,
|
---|
| 454 | const unsigned char *key,
|
---|
| 455 | size_t bits )
|
---|
| 456 | {
|
---|
| 457 | switch( bits )
|
---|
| 458 | {
|
---|
| 459 | case 128: aesni_setkey_enc_128( rk, key ); break;
|
---|
| 460 | case 192: aesni_setkey_enc_192( rk, key ); break;
|
---|
| 461 | case 256: aesni_setkey_enc_256( rk, key ); break;
|
---|
| 462 | default : return( MBEDTLS_ERR_AES_INVALID_KEY_LENGTH );
|
---|
| 463 | }
|
---|
| 464 |
|
---|
| 465 | return( 0 );
|
---|
| 466 | }
|
---|
| 467 |
|
---|
| 468 | #endif /* MBEDTLS_HAVE_X86_64 */
|
---|
| 469 |
|
---|
| 470 | #endif /* MBEDTLS_AESNI_C */
|
---|