434 lines
17 KiB
C
434 lines
17 KiB
C
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/*
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* AES-NI support functions
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*
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* Copyright (C) 2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* [AES-WP] http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set
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* [CLMUL-WP] http://software.intel.com/en-us/articles/intel-carry-less-multiplication-instruction-and-its-usage-for-computing-the-gcm-mode/
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_AESNI_C)
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#include "polarssl/aesni.h"
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#include <stdio.h>
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#if defined(POLARSSL_HAVE_X86_64)
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/*
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* AES-NI support detection routine
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*/
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int aesni_supports( unsigned int what )
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{
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static int done = 0;
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static unsigned int c = 0;
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if( ! done )
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{
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asm( "movl $1, %%eax \n"
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"cpuid \n"
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: "=c" (c)
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:
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: "eax", "ebx", "edx" );
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done = 1;
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}
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return( ( c & what ) != 0 );
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}
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/*
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* AES-NI AES-ECB block en(de)cryption
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*/
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int aesni_crypt_ecb( aes_context *ctx,
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int mode,
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const unsigned char input[16],
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unsigned char output[16] )
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{
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asm( "movdqu (%3), %%xmm0 \n" // load input
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"movdqu (%1), %%xmm1 \n" // load round key 0
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"pxor %%xmm1, %%xmm0 \n" // round 0
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"addq $16, %1 \n" // point to next round key
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"subl $1, %0 \n" // normal rounds = nr - 1
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"test %2, %2 \n" // mode?
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"jz 2f \n" // 0 = decrypt
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"1: \n" // encryption loop
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"movdqu (%1), %%xmm1 \n" // load round key
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"aesenc %%xmm1, %%xmm0 \n" // do round
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"addq $16, %1 \n" // point to next round key
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"subl $1, %0 \n" // loop
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"jnz 1b \n"
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"movdqu (%1), %%xmm1 \n" // load round key
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"aesenclast %%xmm1, %%xmm0 \n" // last round
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"jmp 3f \n"
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"2: \n" // decryption loop
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"movdqu (%1), %%xmm1 \n"
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"aesdec %%xmm1, %%xmm0 \n"
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"addq $16, %1 \n"
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"subl $1, %0 \n"
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"jnz 2b \n"
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"movdqu (%1), %%xmm1 \n" // load round key
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"aesdeclast %%xmm1, %%xmm0 \n" // last round
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"3: \n"
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"movdqu %%xmm0, (%4) \n" // export output
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:
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: "r" (ctx->nr), "r" (ctx->rk), "r" (mode), "r" (input), "r" (output)
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: "memory", "cc", "xmm0", "xmm1" );
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return( 0 );
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}
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/*
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* GCM multiplication: c = a times b in GF(2^128)
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* Based on [CLMUL-WP] algorithms 1 (with equation 27) and 5.
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*/
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void aesni_gcm_mult( unsigned char c[16],
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const unsigned char a[16],
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const unsigned char b[16] )
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{
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unsigned char aa[16], bb[16], cc[16];
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size_t i;
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/* The inputs are in big-endian order, so byte-reverse them */
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for( i = 0; i < 16; i++ )
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{
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aa[i] = a[15 - i];
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bb[i] = b[15 - i];
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}
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asm( "movdqu (%0), %%xmm0 \n" // a1:a0
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"movdqu (%1), %%xmm1 \n" // b1:b0
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/*
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* Caryless multiplication xmm2:xmm1 = xmm0 * xmm1
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* using [CLMUL-WP] algorithm 1 (p. 13).
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*/
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"movdqa %%xmm1, %%xmm2 \n" // copy of b1:b0
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"movdqa %%xmm1, %%xmm3 \n" // same
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"movdqa %%xmm1, %%xmm4 \n" // same
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"pclmulqdq $0x00, %%xmm0, %%xmm1 \n" // a0*b0 = c1:c0
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"pclmulqdq $0x11, %%xmm0, %%xmm2 \n" // a1*b1 = d1:d0
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"pclmulqdq $0x10, %%xmm0, %%xmm3 \n" // a0*b1 = e1:e0
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"pclmulqdq $0x01, %%xmm0, %%xmm4 \n" // a1*b0 = f1:f0
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"pxor %%xmm3, %%xmm4 \n" // e1+f1:e0+f0
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"movdqa %%xmm4, %%xmm3 \n" // same
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"psrldq $8, %%xmm4 \n" // 0:e1+f1
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"pslldq $8, %%xmm3 \n" // e0+f0:0
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"pxor %%xmm4, %%xmm2 \n" // d1:d0+e1+f1
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"pxor %%xmm3, %%xmm1 \n" // c1+e0+f1:c0
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/*
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* Now shift the result one bit to the left,
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* taking advantage of [CLMUL-WP] eq 27 (p. 20)
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*/
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"movdqa %%xmm1, %%xmm3 \n" // r1:r0
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"movdqa %%xmm2, %%xmm4 \n" // r3:r2
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"psllq $1, %%xmm1 \n" // r1<<1:r0<<1
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"psllq $1, %%xmm2 \n" // r3<<1:r2<<1
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"psrlq $63, %%xmm3 \n" // r1>>63:r0>>63
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"psrlq $63, %%xmm4 \n" // r3>>63:r2>>63
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"movdqa %%xmm3, %%xmm5 \n" // r1>>63:r0>>63
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"pslldq $8, %%xmm3 \n" // r0>>63:0
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"pslldq $8, %%xmm4 \n" // r2>>63:0
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"psrldq $8, %%xmm5 \n" // 0:r1>>63
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"por %%xmm3, %%xmm1 \n" // r1<<1|r0>>63:r0<<1
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"por %%xmm4, %%xmm2 \n" // r3<<1|r2>>62:r2<<1
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"por %%xmm5, %%xmm2 \n" // r3<<1|r2>>62:r2<<1|r1>>63
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/*
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* Now reduce modulo the GCM polynomial x^128 + x^7 + x^2 + x + 1
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* using [CLMUL-WP] algorithm 5 (p. 20).
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* Currently xmm2:xmm1 holds x3:x2:x1:x0 (already shifted).
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*/
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/* Step 2 (1) */
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"movdqa %%xmm1, %%xmm3 \n" // x1:x0
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"movdqa %%xmm1, %%xmm4 \n" // same
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"movdqa %%xmm1, %%xmm5 \n" // same
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"psllq $63, %%xmm3 \n" // x1<<63:x0<<63 = stuff:a
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"psllq $62, %%xmm4 \n" // x1<<62:x0<<62 = stuff:b
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"psllq $57, %%xmm5 \n" // x1<<57:x0<<57 = stuff:c
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/* Step 2 (2) */
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"pxor %%xmm4, %%xmm3 \n" // stuff:a+b
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"pxor %%xmm5, %%xmm3 \n" // stuff:a+b+c
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"pslldq $8, %%xmm3 \n" // a+b+c:0
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"pxor %%xmm3, %%xmm1 \n" // x1+a+b+c:x0 = d:x0
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/* Steps 3 and 4 */
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"movdqa %%xmm1,%%xmm0 \n" // d:x0
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"movdqa %%xmm1,%%xmm4 \n" // same
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"movdqa %%xmm1,%%xmm5 \n" // same
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"psrlq $1, %%xmm0 \n" // e1:x0>>1 = e1:e0'
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"psrlq $2, %%xmm4 \n" // f1:x0>>2 = f1:f0'
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"psrlq $7, %%xmm5 \n" // g1:x0>>7 = g1:g0'
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"pxor %%xmm4, %%xmm0 \n" // e1+f1:e0'+f0'
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"pxor %%xmm5, %%xmm0 \n" // e1+f1+g1:e0'+f0'+g0'
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// e0'+f0'+g0' is almost e0+f0+g0, except for some missing
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// bits carried from d. Now get those bits back in.
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"movdqa %%xmm1,%%xmm3 \n" // d:x0
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"movdqa %%xmm1,%%xmm4 \n" // same
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"movdqa %%xmm1,%%xmm5 \n" // same
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"psllq $63, %%xmm3 \n" // d<<63:stuff
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"psllq $62, %%xmm4 \n" // d<<62:stuff
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"psllq $57, %%xmm5 \n" // d<<57:stuff
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"pxor %%xmm4, %%xmm3 \n" // d<<63+d<<62:stuff
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"pxor %%xmm5, %%xmm3 \n" // missing bits of d:stuff
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"psrldq $8, %%xmm3 \n" // 0:missing bits of d
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"pxor %%xmm3, %%xmm0 \n" // e1+f1+g1:e0+f0+g0
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"pxor %%xmm1, %%xmm0 \n" // h1:h0
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"pxor %%xmm2, %%xmm0 \n" // x3+h1:x2+h0
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"movdqu %%xmm0, (%2) \n" // done
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:
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: "r" (aa), "r" (bb), "r" (cc)
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: "memory", "cc", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5" );
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/* Now byte-reverse the outputs */
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for( i = 0; i < 16; i++ )
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c[i] = cc[15 - i];
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return;
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}
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/*
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* Compute decryption round keys from encryption round keys
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*/
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void aesni_inverse_key( unsigned char *invkey,
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const unsigned char *fwdkey, int nr )
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{
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unsigned char *ik = invkey;
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const unsigned char *fk = fwdkey + 16 * nr;
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memcpy( ik, fk, 16 );
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for( fk -= 16, ik += 16; fk > fwdkey; fk -= 16, ik += 16 )
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asm( "movdqu (%0), %%xmm0 \n"
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"aesimc %%xmm0, %%xmm0 \n"
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"movdqu %%xmm0, (%1) \n"
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:
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: "r" (fk), "r" (ik)
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: "memory", "xmm0" );
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memcpy( ik, fk, 16 );
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}
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/*
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* Key expansion, 128-bit case
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*/
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static void aesni_setkey_enc_128( unsigned char *rk,
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const unsigned char *key )
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{
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asm( "movdqu (%1), %%xmm0 \n" // copy the original key
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"movdqu %%xmm0, (%0) \n" // as round key 0
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"jmp 2f \n" // skip auxiliary routine
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/*
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* Finish generating the next round key.
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*
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* On entry xmm0 is r3:r2:r1:r0 and xmm1 is X:stuff:stuff:stuff
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* with X = rot( sub( r3 ) ) ^ RCON.
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*
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* On exit, xmm0 is r7:r6:r5:r4
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* with r4 = X + r0, r5 = r4 + r1, r6 = r5 + r2, r7 = r6 + r3
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* and those are written to the round key buffer.
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*/
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"1: \n"
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"pshufd $0xff, %%xmm1, %%xmm1 \n" // X:X:X:X
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"pxor %%xmm0, %%xmm1 \n" // X+r3:X+r2:X+r1:r4
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"pslldq $4, %%xmm0 \n" // r2:r1:r0:0
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"pxor %%xmm0, %%xmm1 \n" // X+r3+r2:X+r2+r1:r5:r4
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"pslldq $4, %%xmm0 \n" // etc
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"pxor %%xmm0, %%xmm1 \n"
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"pslldq $4, %%xmm0 \n"
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"pxor %%xmm1, %%xmm0 \n" // update xmm0 for next time!
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"add $16, %0 \n" // point to next round key
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"movdqu %%xmm0, (%0) \n" // write it
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"ret \n"
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/* Main "loop" */
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"2: \n"
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"aeskeygenassist $0x01, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x02, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x04, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x08, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x10, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x20, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x40, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x80, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x1B, %%xmm0, %%xmm1 \ncall 1b \n"
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"aeskeygenassist $0x36, %%xmm0, %%xmm1 \ncall 1b \n"
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:
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: "r" (rk), "r" (key)
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: "memory", "cc", "0" );
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}
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/*
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* Key expansion, 192-bit case
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*/
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static void aesni_setkey_enc_192( unsigned char *rk,
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const unsigned char *key )
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{
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asm( "movdqu (%1), %%xmm0 \n" // copy original round key
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"movdqu %%xmm0, (%0) \n"
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"add $16, %0 \n"
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"movq 16(%1), %%xmm1 \n"
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"movq %%xmm1, (%0) \n"
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"add $8, %0 \n"
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"jmp 2f \n" // skip auxiliary routine
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/*
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* Finish generating the next 6 quarter-keys.
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*
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* On entry xmm0 is r3:r2:r1:r0, xmm1 is stuff:stuff:r5:r4
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* and xmm2 is stuff:stuff:X:stuff with X = rot( sub( r3 ) ) ^ RCON.
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*
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* On exit, xmm0 is r9:r8:r7:r6 and xmm1 is stuff:stuff:r11:r10
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* and those are written to the round key buffer.
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*/
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"1: \n"
|
||
|
|
"pshufd $0x55, %%xmm2, %%xmm2 \n" // X:X:X:X
|
||
|
|
"pxor %%xmm0, %%xmm2 \n" // X+r3:X+r2:X+r1:r4
|
||
|
|
"pslldq $4, %%xmm0 \n" // etc
|
||
|
|
"pxor %%xmm0, %%xmm2 \n"
|
||
|
|
"pslldq $4, %%xmm0 \n"
|
||
|
|
"pxor %%xmm0, %%xmm2 \n"
|
||
|
|
"pslldq $4, %%xmm0 \n"
|
||
|
|
"pxor %%xmm2, %%xmm0 \n" // update xmm0 = r9:r8:r7:r6
|
||
|
|
"movdqu %%xmm0, (%0) \n"
|
||
|
|
"add $16, %0 \n"
|
||
|
|
"pshufd $0xff, %%xmm0, %%xmm2 \n" // r9:r9:r9:r9
|
||
|
|
"pxor %%xmm1, %%xmm2 \n" // stuff:stuff:r9+r5:r10
|
||
|
|
"pslldq $4, %%xmm1 \n" // r2:r1:r0:0
|
||
|
|
"pxor %%xmm2, %%xmm1 \n" // update xmm1 = stuff:stuff:r11:r10
|
||
|
|
"movq %%xmm1, (%0) \n"
|
||
|
|
"add $8, %0 \n"
|
||
|
|
"ret \n"
|
||
|
|
|
||
|
|
"2: \n"
|
||
|
|
"aeskeygenassist $0x01, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x02, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x04, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x08, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x10, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x20, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x40, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x80, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
|
||
|
|
:
|
||
|
|
: "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"
|
||
|
|
"movdqu %%xmm0, (%0) \n"
|
||
|
|
"add $16, %0 \n"
|
||
|
|
"movdqu 16(%1), %%xmm1 \n"
|
||
|
|
"movdqu %%xmm1, (%0) \n"
|
||
|
|
"jmp 2f \n" // 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"
|
||
|
|
"pshufd $0xff, %%xmm2, %%xmm2 \n"
|
||
|
|
"pxor %%xmm0, %%xmm2 \n"
|
||
|
|
"pslldq $4, %%xmm0 \n"
|
||
|
|
"pxor %%xmm0, %%xmm2 \n"
|
||
|
|
"pslldq $4, %%xmm0 \n"
|
||
|
|
"pxor %%xmm0, %%xmm2 \n"
|
||
|
|
"pslldq $4, %%xmm0 \n"
|
||
|
|
"pxor %%xmm2, %%xmm0 \n"
|
||
|
|
"add $16, %0 \n"
|
||
|
|
"movdqu %%xmm0, (%0) \n"
|
||
|
|
|
||
|
|
/* Set xmm2 to stuff:Y:stuff:stuff with Y = subword( r11 )
|
||
|
|
* and proceed to generate next round key from there */
|
||
|
|
"aeskeygenassist $0, %%xmm0, %%xmm2\n"
|
||
|
|
"pshufd $0xaa, %%xmm2, %%xmm2 \n"
|
||
|
|
"pxor %%xmm1, %%xmm2 \n"
|
||
|
|
"pslldq $4, %%xmm1 \n"
|
||
|
|
"pxor %%xmm1, %%xmm2 \n"
|
||
|
|
"pslldq $4, %%xmm1 \n"
|
||
|
|
"pxor %%xmm1, %%xmm2 \n"
|
||
|
|
"pslldq $4, %%xmm1 \n"
|
||
|
|
"pxor %%xmm2, %%xmm1 \n"
|
||
|
|
"add $16, %0 \n"
|
||
|
|
"movdqu %%xmm1, (%0) \n"
|
||
|
|
"ret \n"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Main "loop" - Generating one more key than necessary,
|
||
|
|
* see definition of aes_context.buf
|
||
|
|
*/
|
||
|
|
"2: \n"
|
||
|
|
"aeskeygenassist $0x01, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x02, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x04, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x08, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x10, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x20, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
"aeskeygenassist $0x40, %%xmm1, %%xmm2 \ncall 1b \n"
|
||
|
|
:
|
||
|
|
: "r" (rk), "r" (key)
|
||
|
|
: "memory", "cc", "0" );
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Key expansion, wrapper
|
||
|
|
*/
|
||
|
|
int 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( POLARSSL_ERR_AES_INVALID_KEY_LENGTH );
|
||
|
|
}
|
||
|
|
|
||
|
|
return( 0 );
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* POLARSSL_HAVE_X86_64 */
|
||
|
|
|
||
|
|
#endif /* POLARSSL_AESNI_C */
|