dll/3rdparty/mbedtls/aesni.c

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