aesni.c

00001 /*
00002  *  AES-NI support functions
00003  *
00004  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
00005  *  SPDX-License-Identifier: Apache-2.0
00006  *
00007  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
00008  *  not use this file except in compliance with the License.
00009  *  You may obtain a copy of the License at
00010  *
00011  *  http://www.apache.org/licenses/LICENSE-2.0
00012  *
00013  *  Unless required by applicable law or agreed to in writing, software
00014  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00015  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00016  *  See the License for the specific language governing permissions and
00017  *  limitations under the License.
00018  *
00019  *  This file is part of mbed TLS (https://tls.mbed.org)
00020  */
00021 
00022 /*
00023  * [AES-WP] http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set
00024  * [CLMUL-WP] http://software.intel.com/en-us/articles/intel-carry-less-multiplication-instruction-and-its-usage-for-computing-the-gcm-mode/
00025  */
00026 
00027 #if !defined(MBEDTLS_CONFIG_FILE)
00028 #include "mbedtls/config.h"
00029 #else
00030 #include MBEDTLS_CONFIG_FILE
00031 #endif
00032 
00033 #if defined(MBEDTLS_AESNI_C)
00034 
00035 #include "mbedtls/aesni.h"
00036 
00037 #include <string.h>
00038 
00039 #ifndef asm
00040 #define asm __asm
00041 #endif
00042 
00043 #if defined(MBEDTLS_HAVE_X86_64)
00044 
00045 /*
00046  * AES-NI support detection routine
00047  */
00048 int mbedtls_aesni_has_support( unsigned int what )
00049 {
00050     static int done = 0;
00051     static unsigned int c = 0;
00052 
00053     if( ! done )
00054     {
00055         asm( "movl  $1, %%eax   \n\t"
00056              "cpuid             \n\t"
00057              : "=c" (c)
00058              :
00059              : "eax", "ebx", "edx" );
00060         done = 1;
00061     }
00062 
00063     return( ( c & what ) != 0 );
00064 }
00065 
00066 /*
00067  * Binutils needs to be at least 2.19 to support AES-NI instructions.
00068  * Unfortunately, a lot of users have a lower version now (2014-04).
00069  * Emit bytecode directly in order to support "old" version of gas.
00070  *
00071  * Opcodes from the Intel architecture reference manual, vol. 3.
00072  * We always use registers, so we don't need prefixes for memory operands.
00073  * Operand macros are in gas order (src, dst) as opposed to Intel order
00074  * (dst, src) in order to blend better into the surrounding assembly code.
00075  */
00076 #define AESDEC      ".byte 0x66,0x0F,0x38,0xDE,"
00077 #define AESDECLAST  ".byte 0x66,0x0F,0x38,0xDF,"
00078 #define AESENC      ".byte 0x66,0x0F,0x38,0xDC,"
00079 #define AESENCLAST  ".byte 0x66,0x0F,0x38,0xDD,"
00080 #define AESIMC      ".byte 0x66,0x0F,0x38,0xDB,"
00081 #define AESKEYGENA  ".byte 0x66,0x0F,0x3A,0xDF,"
00082 #define PCLMULQDQ   ".byte 0x66,0x0F,0x3A,0x44,"
00083 
00084 #define xmm0_xmm0   "0xC0"
00085 #define xmm0_xmm1   "0xC8"
00086 #define xmm0_xmm2   "0xD0"
00087 #define xmm0_xmm3   "0xD8"
00088 #define xmm0_xmm4   "0xE0"
00089 #define xmm1_xmm0   "0xC1"
00090 #define xmm1_xmm2   "0xD1"
00091 
00092 /*
00093  * AES-NI AES-ECB block en(de)cryption
00094  */
00095 int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx,
00096                      int mode,
00097                      const unsigned char input[16],
00098                      unsigned char output[16] )
00099 {
00100     asm( "movdqu    (%3), %%xmm0    \n\t" // load input
00101          "movdqu    (%1), %%xmm1    \n\t" // load round key 0
00102          "pxor      %%xmm1, %%xmm0  \n\t" // round 0
00103          "addq      $16, %1         \n\t" // point to next round key
00104          "subl      $1, %0          \n\t" // normal rounds = nr - 1
00105          "test      %2, %2          \n\t" // mode?
00106          "jz        2f              \n\t" // 0 = decrypt
00107 
00108          "1:                        \n\t" // encryption loop
00109          "movdqu    (%1), %%xmm1    \n\t" // load round key
00110          AESENC     xmm1_xmm0      "\n\t" // do round
00111          "addq      $16, %1         \n\t" // point to next round key
00112          "subl      $1, %0          \n\t" // loop
00113          "jnz       1b              \n\t"
00114          "movdqu    (%1), %%xmm1    \n\t" // load round key
00115          AESENCLAST xmm1_xmm0      "\n\t" // last round
00116          "jmp       3f              \n\t"
00117 
00118          "2:                        \n\t" // decryption loop
00119          "movdqu    (%1), %%xmm1    \n\t"
00120          AESDEC     xmm1_xmm0      "\n\t" // do round
00121          "addq      $16, %1         \n\t"
00122          "subl      $1, %0          \n\t"
00123          "jnz       2b              \n\t"
00124          "movdqu    (%1), %%xmm1    \n\t" // load round key
00125          AESDECLAST xmm1_xmm0      "\n\t" // last round
00126 
00127          "3:                        \n\t"
00128          "movdqu    %%xmm0, (%4)    \n\t" // export output
00129          :
00130          : "r" (ctx->nr ), "r" (ctx->rk ), "r" (mode), "r" (input), "r" (output)
00131          : "memory", "cc", "xmm0", "xmm1" );
00132 
00133 
00134     return( 0 );
00135 }
00136 
00137 /*
00138  * GCM multiplication: c = a times b in GF(2^128)
00139  * Based on [CLMUL-WP] algorithms 1 (with equation 27) and 5.
00140  */
00141 void mbedtls_aesni_gcm_mult( unsigned char c[16],
00142                      const unsigned char a[16],
00143                      const unsigned char b[16] )
00144 {
00145     unsigned char aa[16], bb[16], cc[16];
00146     size_t i;
00147 
00148     /* The inputs are in big-endian order, so byte-reverse them */
00149     for( i = 0; i < 16; i++ )
00150     {
00151         aa[i] = a[15 - i];
00152         bb[i] = b[15 - i];
00153     }
00154 
00155     asm( "movdqu (%0), %%xmm0               \n\t" // a1:a0
00156          "movdqu (%1), %%xmm1               \n\t" // b1:b0
00157 
00158          /*
00159           * Caryless multiplication xmm2:xmm1 = xmm0 * xmm1
00160           * using [CLMUL-WP] algorithm 1 (p. 13).
00161           */
00162          "movdqa %%xmm1, %%xmm2             \n\t" // copy of b1:b0
00163          "movdqa %%xmm1, %%xmm3             \n\t" // same
00164          "movdqa %%xmm1, %%xmm4             \n\t" // same
00165          PCLMULQDQ xmm0_xmm1 ",0x00         \n\t" // a0*b0 = c1:c0
00166          PCLMULQDQ xmm0_xmm2 ",0x11         \n\t" // a1*b1 = d1:d0
00167          PCLMULQDQ xmm0_xmm3 ",0x10         \n\t" // a0*b1 = e1:e0
00168          PCLMULQDQ xmm0_xmm4 ",0x01         \n\t" // a1*b0 = f1:f0
00169          "pxor %%xmm3, %%xmm4               \n\t" // e1+f1:e0+f0
00170          "movdqa %%xmm4, %%xmm3             \n\t" // same
00171          "psrldq $8, %%xmm4                 \n\t" // 0:e1+f1
00172          "pslldq $8, %%xmm3                 \n\t" // e0+f0:0
00173          "pxor %%xmm4, %%xmm2               \n\t" // d1:d0+e1+f1
00174          "pxor %%xmm3, %%xmm1               \n\t" // c1+e0+f1:c0
00175 
00176          /*
00177           * Now shift the result one bit to the left,
00178           * taking advantage of [CLMUL-WP] eq 27 (p. 20)
00179           */
00180          "movdqa %%xmm1, %%xmm3             \n\t" // r1:r0
00181          "movdqa %%xmm2, %%xmm4             \n\t" // r3:r2
00182          "psllq $1, %%xmm1                  \n\t" // r1<<1:r0<<1
00183          "psllq $1, %%xmm2                  \n\t" // r3<<1:r2<<1
00184          "psrlq $63, %%xmm3                 \n\t" // r1>>63:r0>>63
00185          "psrlq $63, %%xmm4                 \n\t" // r3>>63:r2>>63
00186          "movdqa %%xmm3, %%xmm5             \n\t" // r1>>63:r0>>63
00187          "pslldq $8, %%xmm3                 \n\t" // r0>>63:0
00188          "pslldq $8, %%xmm4                 \n\t" // r2>>63:0
00189          "psrldq $8, %%xmm5                 \n\t" // 0:r1>>63
00190          "por %%xmm3, %%xmm1                \n\t" // r1<<1|r0>>63:r0<<1
00191          "por %%xmm4, %%xmm2                \n\t" // r3<<1|r2>>62:r2<<1
00192          "por %%xmm5, %%xmm2                \n\t" // r3<<1|r2>>62:r2<<1|r1>>63
00193 
00194          /*
00195           * Now reduce modulo the GCM polynomial x^128 + x^7 + x^2 + x + 1
00196           * using [CLMUL-WP] algorithm 5 (p. 20).
00197           * Currently xmm2:xmm1 holds x3:x2:x1:x0 (already shifted).
00198           */
00199          /* Step 2 (1) */
00200          "movdqa %%xmm1, %%xmm3             \n\t" // x1:x0
00201          "movdqa %%xmm1, %%xmm4             \n\t" // same
00202          "movdqa %%xmm1, %%xmm5             \n\t" // same
00203          "psllq $63, %%xmm3                 \n\t" // x1<<63:x0<<63 = stuff:a
00204          "psllq $62, %%xmm4                 \n\t" // x1<<62:x0<<62 = stuff:b
00205          "psllq $57, %%xmm5                 \n\t" // x1<<57:x0<<57 = stuff:c
00206 
00207          /* Step 2 (2) */
00208          "pxor %%xmm4, %%xmm3               \n\t" // stuff:a+b
00209          "pxor %%xmm5, %%xmm3               \n\t" // stuff:a+b+c
00210          "pslldq $8, %%xmm3                 \n\t" // a+b+c:0
00211          "pxor %%xmm3, %%xmm1               \n\t" // x1+a+b+c:x0 = d:x0
00212 
00213          /* Steps 3 and 4 */
00214          "movdqa %%xmm1,%%xmm0              \n\t" // d:x0
00215          "movdqa %%xmm1,%%xmm4              \n\t" // same
00216          "movdqa %%xmm1,%%xmm5              \n\t" // same
00217          "psrlq $1, %%xmm0                  \n\t" // e1:x0>>1 = e1:e0'
00218          "psrlq $2, %%xmm4                  \n\t" // f1:x0>>2 = f1:f0'
00219          "psrlq $7, %%xmm5                  \n\t" // g1:x0>>7 = g1:g0'
00220          "pxor %%xmm4, %%xmm0               \n\t" // e1+f1:e0'+f0'
00221          "pxor %%xmm5, %%xmm0               \n\t" // e1+f1+g1:e0'+f0'+g0'
00222          // e0'+f0'+g0' is almost e0+f0+g0, ex\tcept for some missing
00223          // bits carried from d. Now get those\t bits back in.
00224          "movdqa %%xmm1,%%xmm3              \n\t" // d:x0
00225          "movdqa %%xmm1,%%xmm4              \n\t" // same
00226          "movdqa %%xmm1,%%xmm5              \n\t" // same
00227          "psllq $63, %%xmm3                 \n\t" // d<<63:stuff
00228          "psllq $62, %%xmm4                 \n\t" // d<<62:stuff
00229          "psllq $57, %%xmm5                 \n\t" // d<<57:stuff
00230          "pxor %%xmm4, %%xmm3               \n\t" // d<<63+d<<62:stuff
00231          "pxor %%xmm5, %%xmm3               \n\t" // missing bits of d:stuff
00232          "psrldq $8, %%xmm3                 \n\t" // 0:missing bits of d
00233          "pxor %%xmm3, %%xmm0               \n\t" // e1+f1+g1:e0+f0+g0
00234          "pxor %%xmm1, %%xmm0               \n\t" // h1:h0
00235          "pxor %%xmm2, %%xmm0               \n\t" // x3+h1:x2+h0
00236 
00237          "movdqu %%xmm0, (%2)               \n\t" // done
00238          :
00239          : "r" (aa), "r" (bb), "r" (cc)
00240          : "memory", "cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5" );
00241 
00242     /* Now byte-reverse the outputs */
00243     for( i = 0; i < 16; i++ )
00244         c[i] = cc[15 - i];
00245 
00246     return;
00247 }
00248 
00249 /*
00250  * Compute decryption round keys from encryption round keys
00251  */
00252 void mbedtls_aesni_inverse_key( unsigned char *invkey,
00253                         const unsigned char *fwdkey, int nr )
00254 {
00255     unsigned char *ik = invkey;
00256     const unsigned char *fk = fwdkey + 16 * nr;
00257 
00258     memcpy( ik, fk, 16 );
00259 
00260     for( fk -= 16, ik += 16; fk > fwdkey; fk -= 16, ik += 16 )
00261         asm( "movdqu (%0), %%xmm0       \n\t"
00262              AESIMC  xmm0_xmm0         "\n\t"
00263              "movdqu %%xmm0, (%1)       \n\t"
00264              :
00265              : "r" (fk), "r" (ik)
00266              : "memory", "xmm0" );
00267 
00268     memcpy( ik, fk, 16 );
00269 }
00270 
00271 /*
00272  * Key expansion, 128-bit case
00273  */
00274 static void aesni_setkey_enc_128( unsigned char *rk,
00275                                   const unsigned char *key )
00276 {
00277     asm( "movdqu (%1), %%xmm0               \n\t" // copy the original key
00278          "movdqu %%xmm0, (%0)               \n\t" // as round key 0
00279          "jmp 2f                            \n\t" // skip auxiliary routine
00280 
00281          /*
00282           * Finish generating the next round key.
00283           *
00284           * On entry xmm0 is r3:r2:r1:r0 and xmm1 is X:stuff:stuff:stuff
00285           * with X = rot( sub( r3 ) ) ^ RCON.
00286           *
00287           * On exit, xmm0 is r7:r6:r5:r4
00288           * with r4 = X + r0, r5 = r4 + r1, r6 = r5 + r2, r7 = r6 + r3
00289           * and those are written to the round key buffer.
00290           */
00291          "1:                                \n\t"
00292          "pshufd $0xff, %%xmm1, %%xmm1      \n\t" // X:X:X:X
00293          "pxor %%xmm0, %%xmm1               \n\t" // X+r3:X+r2:X+r1:r4
00294          "pslldq $4, %%xmm0                 \n\t" // r2:r1:r0:0
00295          "pxor %%xmm0, %%xmm1               \n\t" // X+r3+r2:X+r2+r1:r5:r4
00296          "pslldq $4, %%xmm0                 \n\t" // etc
00297          "pxor %%xmm0, %%xmm1               \n\t"
00298          "pslldq $4, %%xmm0                 \n\t"
00299          "pxor %%xmm1, %%xmm0               \n\t" // update xmm0 for next time!
00300          "add $16, %0                       \n\t" // point to next round key
00301          "movdqu %%xmm0, (%0)               \n\t" // write it
00302          "ret                               \n\t"
00303 
00304          /* Main "loop" */
00305          "2:                                \n\t"
00306          AESKEYGENA xmm0_xmm1 ",0x01        \n\tcall 1b \n\t"
00307          AESKEYGENA xmm0_xmm1 ",0x02        \n\tcall 1b \n\t"
00308          AESKEYGENA xmm0_xmm1 ",0x04        \n\tcall 1b \n\t"
00309          AESKEYGENA xmm0_xmm1 ",0x08        \n\tcall 1b \n\t"
00310          AESKEYGENA xmm0_xmm1 ",0x10        \n\tcall 1b \n\t"
00311          AESKEYGENA xmm0_xmm1 ",0x20        \n\tcall 1b \n\t"
00312          AESKEYGENA xmm0_xmm1 ",0x40        \n\tcall 1b \n\t"
00313          AESKEYGENA xmm0_xmm1 ",0x80        \n\tcall 1b \n\t"
00314          AESKEYGENA xmm0_xmm1 ",0x1B        \n\tcall 1b \n\t"
00315          AESKEYGENA xmm0_xmm1 ",0x36        \n\tcall 1b \n\t"
00316          :
00317          : "r" (rk), "r" (key)
00318          : "memory", "cc", "0" );
00319 }
00320 
00321 /*
00322  * Key expansion, 192-bit case
00323  */
00324 static void aesni_setkey_enc_192( unsigned char *rk,
00325                                   const unsigned char *key )
00326 {
00327     asm( "movdqu (%1), %%xmm0   \n\t" // copy original round key
00328          "movdqu %%xmm0, (%0)   \n\t"
00329          "add $16, %0           \n\t"
00330          "movq 16(%1), %%xmm1   \n\t"
00331          "movq %%xmm1, (%0)     \n\t"
00332          "add $8, %0            \n\t"
00333          "jmp 2f                \n\t" // skip auxiliary routine
00334 
00335          /*
00336           * Finish generating the next 6 quarter-keys.
00337           *
00338           * On entry xmm0 is r3:r2:r1:r0, xmm1 is stuff:stuff:r5:r4
00339           * and xmm2 is stuff:stuff:X:stuff with X = rot( sub( r3 ) ) ^ RCON.
00340           *
00341           * On exit, xmm0 is r9:r8:r7:r6 and xmm1 is stuff:stuff:r11:r10
00342           * and those are written to the round key buffer.
00343           */
00344          "1:                            \n\t"
00345          "pshufd $0x55, %%xmm2, %%xmm2  \n\t" // X:X:X:X
00346          "pxor %%xmm0, %%xmm2           \n\t" // X+r3:X+r2:X+r1:r4
00347          "pslldq $4, %%xmm0             \n\t" // etc
00348          "pxor %%xmm0, %%xmm2           \n\t"
00349          "pslldq $4, %%xmm0             \n\t"
00350          "pxor %%xmm0, %%xmm2           \n\t"
00351          "pslldq $4, %%xmm0             \n\t"
00352          "pxor %%xmm2, %%xmm0           \n\t" // update xmm0 = r9:r8:r7:r6
00353          "movdqu %%xmm0, (%0)           \n\t"
00354          "add $16, %0                   \n\t"
00355          "pshufd $0xff, %%xmm0, %%xmm2  \n\t" // r9:r9:r9:r9
00356          "pxor %%xmm1, %%xmm2           \n\t" // stuff:stuff:r9+r5:r10
00357          "pslldq $4, %%xmm1             \n\t" // r2:r1:r0:0
00358          "pxor %%xmm2, %%xmm1           \n\t" // xmm1 = stuff:stuff:r11:r10
00359          "movq %%xmm1, (%0)             \n\t"
00360          "add $8, %0                    \n\t"
00361          "ret                           \n\t"
00362 
00363          "2:                            \n\t"
00364          AESKEYGENA xmm1_xmm2 ",0x01    \n\tcall 1b \n\t"
00365          AESKEYGENA xmm1_xmm2 ",0x02    \n\tcall 1b \n\t"
00366          AESKEYGENA xmm1_xmm2 ",0x04    \n\tcall 1b \n\t"
00367          AESKEYGENA xmm1_xmm2 ",0x08    \n\tcall 1b \n\t"
00368          AESKEYGENA xmm1_xmm2 ",0x10    \n\tcall 1b \n\t"
00369          AESKEYGENA xmm1_xmm2 ",0x20    \n\tcall 1b \n\t"
00370          AESKEYGENA xmm1_xmm2 ",0x40    \n\tcall 1b \n\t"
00371          AESKEYGENA xmm1_xmm2 ",0x80    \n\tcall 1b \n\t"
00372 
00373          :
00374          : "r" (rk), "r" (key)
00375          : "memory", "cc", "0" );
00376 }
00377 
00378 /*
00379  * Key expansion, 256-bit case
00380  */
00381 static void aesni_setkey_enc_256( unsigned char *rk,
00382                                   const unsigned char *key )
00383 {
00384     asm( "movdqu (%1), %%xmm0           \n\t"
00385          "movdqu %%xmm0, (%0)           \n\t"
00386          "add $16, %0                   \n\t"
00387          "movdqu 16(%1), %%xmm1         \n\t"
00388          "movdqu %%xmm1, (%0)           \n\t"
00389          "jmp 2f                        \n\t" // skip auxiliary routine
00390 
00391          /*
00392           * Finish generating the next two round keys.
00393           *
00394           * On entry xmm0 is r3:r2:r1:r0, xmm1 is r7:r6:r5:r4 and
00395           * xmm2 is X:stuff:stuff:stuff with X = rot( sub( r7 )) ^ RCON
00396           *
00397           * On exit, xmm0 is r11:r10:r9:r8 and xmm1 is r15:r14:r13:r12
00398           * and those have been written to the output buffer.
00399           */
00400          "1:                                \n\t"
00401          "pshufd $0xff, %%xmm2, %%xmm2      \n\t"
00402          "pxor %%xmm0, %%xmm2               \n\t"
00403          "pslldq $4, %%xmm0                 \n\t"
00404          "pxor %%xmm0, %%xmm2               \n\t"
00405          "pslldq $4, %%xmm0                 \n\t"
00406          "pxor %%xmm0, %%xmm2               \n\t"
00407          "pslldq $4, %%xmm0                 \n\t"
00408          "pxor %%xmm2, %%xmm0               \n\t"
00409          "add $16, %0                       \n\t"
00410          "movdqu %%xmm0, (%0)               \n\t"
00411 
00412          /* Set xmm2 to stuff:Y:stuff:stuff with Y = subword( r11 )
00413           * and proceed to generate next round key from there */
00414          AESKEYGENA xmm0_xmm2 ",0x00        \n\t"
00415          "pshufd $0xaa, %%xmm2, %%xmm2      \n\t"
00416          "pxor %%xmm1, %%xmm2               \n\t"
00417          "pslldq $4, %%xmm1                 \n\t"
00418          "pxor %%xmm1, %%xmm2               \n\t"
00419          "pslldq $4, %%xmm1                 \n\t"
00420          "pxor %%xmm1, %%xmm2               \n\t"
00421          "pslldq $4, %%xmm1                 \n\t"
00422          "pxor %%xmm2, %%xmm1               \n\t"
00423          "add $16, %0                       \n\t"
00424          "movdqu %%xmm1, (%0)               \n\t"
00425          "ret                               \n\t"
00426 
00427          /*
00428           * Main "loop" - Generating one more key than necessary,
00429           * see definition of mbedtls_aes_context.buf
00430           */
00431          "2:                                \n\t"
00432          AESKEYGENA xmm1_xmm2 ",0x01        \n\tcall 1b \n\t"
00433          AESKEYGENA xmm1_xmm2 ",0x02        \n\tcall 1b \n\t"
00434          AESKEYGENA xmm1_xmm2 ",0x04        \n\tcall 1b \n\t"
00435          AESKEYGENA xmm1_xmm2 ",0x08        \n\tcall 1b \n\t"
00436          AESKEYGENA xmm1_xmm2 ",0x10        \n\tcall 1b \n\t"
00437          AESKEYGENA xmm1_xmm2 ",0x20        \n\tcall 1b \n\t"
00438          AESKEYGENA xmm1_xmm2 ",0x40        \n\tcall 1b \n\t"
00439          :
00440          : "r" (rk), "r" (key)
00441          : "memory", "cc", "0" );
00442 }
00443 
00444 /*
00445  * Key expansion, wrapper
00446  */
00447 int mbedtls_aesni_setkey_enc( unsigned char *rk,
00448                       const unsigned char *key,
00449                       size_t bits )
00450 {
00451     switch( bits )
00452     {
00453         case 128: aesni_setkey_enc_128( rk, key ); break;
00454         case 192: aesni_setkey_enc_192( rk, key ); break;
00455         case 256: aesni_setkey_enc_256( rk, key ); break;
00456         default : return( MBEDTLS_ERR_AES_INVALID_KEY_LENGTH );
00457     }
00458 
00459     return( 0 );
00460 }
00461 
00462 #endif /* MBEDTLS_HAVE_X86_64 */
00463 
00464 #endif /* MBEDTLS_AESNI_C */