/*
* copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * some optimization ideas from aes128.c by Reimar Doeffinger
+ *
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * some optimization ideas from aes128.c by Reimar Doeffinger
*/
#include "common.h"
+#include "intreadwrite.h"
+#include "timer.h"
#include "aes.h"
-typedef struct AVAES{
- uint8_t round_key[15][4][4];
- uint8_t state[2][4][4];
+typedef union {
+ uint64_t u64[2];
+ uint32_t u32[4];
+ uint8_t u8x4[4][4];
+ uint8_t u8[16];
+} av_aes_block;
+
+typedef struct AVAES {
+ // Note: round_key[16] is accessed in the init code, but this only
+ // overwrites state, which does not matter (see also commit ba554c0).
+ av_aes_block round_key[15];
+ av_aes_block state[2];
int rounds;
-}AVAES;
+} AVAES;
-const int av_aes_size= sizeof(AVAES);
+struct AVAES *av_aes_alloc(void)
+{
+ return av_mallocz(sizeof(struct AVAES));
+}
static const uint8_t rcon[10] = {
- 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
+ 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
};
static uint8_t sbox[256];
static uint8_t inv_sbox[256];
-#ifdef CONFIG_SMALL
+#if CONFIG_SMALL
static uint32_t enc_multbl[1][256];
static uint32_t dec_multbl[1][256];
#else
static uint32_t dec_multbl[4][256];
#endif
-static inline void addkey(uint64_t dst[2], uint64_t src[2], uint64_t round_key[2]){
- dst[0] = src[0] ^ round_key[0];
- dst[1] = src[1] ^ round_key[1];
+#if HAVE_BIGENDIAN
+# define ROT(x, s) ((x >> s) | (x << (32-s)))
+#else
+# define ROT(x, s) ((x << s) | (x >> (32-s)))
+#endif
+
+static inline void addkey(av_aes_block *dst, const av_aes_block *src,
+ const av_aes_block *round_key)
+{
+ dst->u64[0] = src->u64[0] ^ round_key->u64[0];
+ dst->u64[1] = src->u64[1] ^ round_key->u64[1];
}
-static void subshift(uint8_t s0[2][16], int s, uint8_t *box){
- uint8_t (*s1)[16]= s0[0] - s;
- uint8_t (*s3)[16]= s0[0] + s;
- s0[0][0]=box[s0[1][ 0]]; s0[0][ 4]=box[s0[1][ 4]]; s0[0][ 8]=box[s0[1][ 8]]; s0[0][12]=box[s0[1][12]];
- s1[0][3]=box[s1[1][ 7]]; s1[0][ 7]=box[s1[1][11]]; s1[0][11]=box[s1[1][15]]; s1[0][15]=box[s1[1][ 3]];
- s0[0][2]=box[s0[1][10]]; s0[0][10]=box[s0[1][ 2]]; s0[0][ 6]=box[s0[1][14]]; s0[0][14]=box[s0[1][ 6]];
- s3[0][1]=box[s3[1][13]]; s3[0][13]=box[s3[1][ 9]]; s3[0][ 9]=box[s3[1][ 5]]; s3[0][ 5]=box[s3[1][ 1]];
+static inline void addkey_s(av_aes_block *dst, const uint8_t *src,
+ const av_aes_block *round_key)
+{
+ dst->u64[0] = AV_RN64(src) ^ round_key->u64[0];
+ dst->u64[1] = AV_RN64(src + 8) ^ round_key->u64[1];
}
-#define ROT(x,s) ((x<<s)|(x>>(32-s)))
-#if 0
-static inline void mix(uint8_t state[4][4], uint32_t multbl[4][256]){
- int i;
- for(i=0; i<4; i++)
-#ifdef CONFIG_SMALL
- ((uint32_t *)(state))[i] = multbl[0][state[i][0]] ^ ROT(multbl[0][state[i][1]], 8)
- ^ROT(multbl[0][state[i][2]],16) ^ ROT(multbl[0][state[i][3]],24);
+static inline void addkey_d(uint8_t *dst, const av_aes_block *src,
+ const av_aes_block *round_key)
+{
+ AV_WN64(dst, src->u64[0] ^ round_key->u64[0]);
+ AV_WN64(dst + 8, src->u64[1] ^ round_key->u64[1]);
+}
+
+static void subshift(av_aes_block s0[2], int s, const uint8_t *box)
+{
+ av_aes_block *s1 = (av_aes_block *) (s0[0].u8 - s);
+ av_aes_block *s3 = (av_aes_block *) (s0[0].u8 + s);
+
+ s0[0].u8[ 0] = box[s0[1].u8[ 0]];
+ s0[0].u8[ 4] = box[s0[1].u8[ 4]];
+ s0[0].u8[ 8] = box[s0[1].u8[ 8]];
+ s0[0].u8[12] = box[s0[1].u8[12]];
+ s1[0].u8[ 3] = box[s1[1].u8[ 7]];
+ s1[0].u8[ 7] = box[s1[1].u8[11]];
+ s1[0].u8[11] = box[s1[1].u8[15]];
+ s1[0].u8[15] = box[s1[1].u8[ 3]];
+ s0[0].u8[ 2] = box[s0[1].u8[10]];
+ s0[0].u8[10] = box[s0[1].u8[ 2]];
+ s0[0].u8[ 6] = box[s0[1].u8[14]];
+ s0[0].u8[14] = box[s0[1].u8[ 6]];
+ s3[0].u8[ 1] = box[s3[1].u8[13]];
+ s3[0].u8[13] = box[s3[1].u8[ 9]];
+ s3[0].u8[ 9] = box[s3[1].u8[ 5]];
+ s3[0].u8[ 5] = box[s3[1].u8[ 1]];
+}
+
+static inline int mix_core(uint32_t multbl[][256], int a, int b, int c, int d)
+{
+#if CONFIG_SMALL
+ return multbl[0][a] ^ ROT(multbl[0][b], 8) ^ ROT(multbl[0][c], 16) ^ ROT(multbl[0][d], 24);
#else
- ((uint32_t *)(state))[i] = multbl[0][state[i][0]] ^ multbl[1][state[i][1]]
- ^multbl[2][state[i][2]] ^ multbl[3][state[i][3]];
+ return multbl[0][a] ^ multbl[1][b] ^ multbl[2][c] ^ multbl[3][d];
#endif
}
-#endif
-static inline void mix(uint8_t state[2][4][4], uint32_t multbl[4][256], int s1, int s3){
- ((uint32_t *)(state))[0] = multbl[0][state[1][0][0]] ^ multbl[1][state[1][s1 ][1]]
- ^multbl[2][state[1][2][2]] ^ multbl[3][state[1][s3 ][3]];
- ((uint32_t *)(state))[1] = multbl[0][state[1][1][0]] ^ multbl[1][state[1][s3-1][1]]
- ^multbl[2][state[1][3][2]] ^ multbl[3][state[1][s1-1][3]];
- ((uint32_t *)(state))[2] = multbl[0][state[1][2][0]] ^ multbl[1][state[1][s3 ][1]]
- ^multbl[2][state[1][0][2]] ^ multbl[3][state[1][s1 ][3]];
- ((uint32_t *)(state))[3] = multbl[0][state[1][3][0]] ^ multbl[1][state[1][s1-1][1]]
- ^multbl[2][state[1][1][2]] ^ multbl[3][state[1][s3-1][3]];
+static inline void mix(av_aes_block state[2], uint32_t multbl[][256], int s1, int s3)
+{
+ uint8_t (*src)[4] = state[1].u8x4;
+ state[0].u32[0] = mix_core(multbl, src[0][0], src[s1 ][1], src[2][2], src[s3 ][3]);
+ state[0].u32[1] = mix_core(multbl, src[1][0], src[s3 - 1][1], src[3][2], src[s1 - 1][3]);
+ state[0].u32[2] = mix_core(multbl, src[2][0], src[s3 ][1], src[0][2], src[s1 ][3]);
+ state[0].u32[3] = mix_core(multbl, src[3][0], src[s1 - 1][1], src[1][2], src[s3 - 1][3]);
}
-static inline void crypt(AVAES *a, int s, uint8_t *sbox, uint32_t *multbl){
+static inline void crypt(AVAES *a, int s, const uint8_t *sbox,
+ uint32_t multbl[][256])
+{
int r;
- for(r=a->rounds-1; r>0; r--){
- mix(a->state, multbl, 3-s, 1+s);
- addkey(a->state[1], a->state[0], a->round_key[r]);
+ for (r = a->rounds - 1; r > 0; r--) {
+ mix(a->state, multbl, 3 - s, 1 + s);
+ addkey(&a->state[1], &a->state[0], &a->round_key[r]);
}
- subshift(a->state[0][0], s, sbox);
+
+ subshift(&a->state[0], s, sbox);
}
-void aes_crypt(AVAES *a, uint8_t *dst, uint8_t *src, int count, uint8_t *iv, int decrypt){
- while(count--){
- addkey(a->state[1], src, a->round_key[a->rounds]);
- if(decrypt) {
+void av_aes_crypt(AVAES *a, uint8_t *dst, const uint8_t *src,
+ int count, uint8_t *iv, int decrypt)
+{
+ while (count--) {
+ addkey_s(&a->state[1], src, &a->round_key[a->rounds]);
+ if (decrypt) {
crypt(a, 0, inv_sbox, dec_multbl);
- if(iv){
- addkey(a->state[0], a->state[0], iv);
+ if (iv) {
+ addkey_s(&a->state[0], iv, &a->state[0]);
memcpy(iv, src, 16);
}
- addkey(dst, a->state[0], a->round_key[0]);
- }else{
- if(iv) addkey(a->state[1], a->state[1], iv);
- crypt(a, 2, sbox, enc_multbl);
- addkey(dst, a->state[0], a->round_key[0]);
- if(iv) memcpy(iv, dst, 16);
+ addkey_d(dst, &a->state[0], &a->round_key[0]);
+ } else {
+ if (iv)
+ addkey_s(&a->state[1], iv, &a->state[1]);
+ crypt(a, 2, sbox, enc_multbl);
+ addkey_d(dst, &a->state[0], &a->round_key[0]);
+ if (iv)
+ memcpy(iv, dst, 16);
}
- src+=16;
- dst+=16;
+ src += 16;
+ dst += 16;
}
}
-static void init_multbl2(uint8_t tbl[1024], int c[4], uint8_t *log8, uint8_t *alog8, uint8_t *sbox){
- int i, j;
- for(i=0; i<1024; i++){
- int x= sbox[i>>2];
- if(x) tbl[i]= alog8[ log8[x] + log8[c[i&3]] ];
- }
-#ifndef CONFIG_SMALL
- for(j=256; j<1024; j++)
- for(i=0; i<4; i++)
- tbl[4*j+i]= tbl[4*j + ((i-1)&3) - 1024];
+static void init_multbl2(uint32_t tbl[][256], const int c[4],
+ const uint8_t *log8, const uint8_t *alog8,
+ const uint8_t *sbox)
+{
+ int i;
+
+ for (i = 0; i < 256; i++) {
+ int x = sbox[i];
+ if (x) {
+ int k, l, m, n;
+ x = log8[x];
+ k = alog8[x + log8[c[0]]];
+ l = alog8[x + log8[c[1]]];
+ m = alog8[x + log8[c[2]]];
+ n = alog8[x + log8[c[3]]];
+ tbl[0][i] = AV_NE(MKBETAG(k, l, m, n), MKTAG(k, l, m, n));
+#if !CONFIG_SMALL
+ tbl[1][i] = ROT(tbl[0][i], 8);
+ tbl[2][i] = ROT(tbl[0][i], 16);
+ tbl[3][i] = ROT(tbl[0][i], 24);
#endif
+ }
+ }
}
// this is based on the reference AES code by Paulo Barreto and Vincent Rijmen
-int av_aes_init(AVAES *a, uint8_t *key, int key_bits, int decrypt) {
+int av_aes_init(AVAES *a, const uint8_t *key, int key_bits, int decrypt)
+{
int i, j, t, rconpointer = 0;
uint8_t tk[8][4];
- int KC= key_bits>>5;
- int rounds= KC + 6;
- uint8_t log8[256];
+ int KC = key_bits >> 5;
+ int rounds = KC + 6;
+ uint8_t log8[256];
uint8_t alog8[512];
- if(!enc_multbl[4][1023]){
- j=1;
- for(i=0; i<255; i++){
- alog8[i]=
- alog8[i+255]= j;
- log8[j]= i;
- j^= j+j;
- if(j>255) j^= 0x11B;
+ if (!enc_multbl[FF_ARRAY_ELEMS(enc_multbl) - 1][FF_ARRAY_ELEMS(enc_multbl[0]) - 1]) {
+ j = 1;
+ for (i = 0; i < 255; i++) {
+ alog8[i] = alog8[i + 255] = j;
+ log8[j] = i;
+ j ^= j + j;
+ if (j > 255)
+ j ^= 0x11B;
}
- for(i=0; i<256; i++){
- j= i ? alog8[255-log8[i]] : 0;
- j ^= (j<<1) ^ (j<<2) ^ (j<<3) ^ (j<<4);
- j = (j ^ (j>>8) ^ 99) & 255;
- inv_sbox[j]= i;
- sbox [i]= j;
+ for (i = 0; i < 256; i++) {
+ j = i ? alog8[255 - log8[i]] : 0;
+ j ^= (j << 1) ^ (j << 2) ^ (j << 3) ^ (j << 4);
+ j = (j ^ (j >> 8) ^ 99) & 255;
+ inv_sbox[j] = i;
+ sbox[i] = j;
}
- init_multbl2(dec_multbl[0], (int[4]){0xe, 0x9, 0xd, 0xb}, log8, alog8, inv_sbox);
- init_multbl2(enc_multbl[0], (int[4]){0x2, 0x1, 0x1, 0x3}, log8, alog8, sbox);
+ init_multbl2(dec_multbl, (const int[4]) { 0xe, 0x9, 0xd, 0xb },
+ log8, alog8, inv_sbox);
+ init_multbl2(enc_multbl, (const int[4]) { 0x2, 0x1, 0x1, 0x3 },
+ log8, alog8, sbox);
}
- if(key_bits!=128 && key_bits!=192 && key_bits!=256)
+ if (key_bits != 128 && key_bits != 192 && key_bits != 256)
return -1;
- a->rounds= rounds;
-
- memcpy(tk, key, KC*4);
+ a->rounds = rounds;
- for(t= 0; t < (rounds+1)*16;) {
- memcpy(a->round_key[0][0]+t, tk, KC*4);
- t+= KC*4;
+ memcpy(tk, key, KC * 4);
+ memcpy(a->round_key[0].u8, key, KC * 4);
- for(i = 0; i < 4; i++)
- tk[0][i] ^= sbox[tk[KC-1][(i+1)&3]];
+ for (t = KC * 4; t < (rounds + 1) * 16; t += KC * 4) {
+ for (i = 0; i < 4; i++)
+ tk[0][i] ^= sbox[tk[KC - 1][(i + 1) & 3]];
tk[0][0] ^= rcon[rconpointer++];
- for(j = 1; j < KC; j++){
- if(KC != 8 || j != KC>>1)
- for(i = 0; i < 4; i++) tk[j][i] ^= tk[j-1][i];
+ for (j = 1; j < KC; j++) {
+ if (KC != 8 || j != KC >> 1)
+ for (i = 0; i < 4; i++)
+ tk[j][i] ^= tk[j - 1][i];
else
- for(i = 0; i < 4; i++) tk[j][i] ^= sbox[tk[j-1][i]];
+ for (i = 0; i < 4; i++)
+ tk[j][i] ^= sbox[tk[j - 1][i]];
}
+
+ memcpy(a->round_key[0].u8 + t, tk, KC * 4);
}
- if(decrypt){
- for(i=1; i<rounds; i++){
- uint8_t tmp[3][16];
- memcpy(tmp[2], a->round_key[i][0], 16);
- subshift(tmp[1], 0, sbox);
+ if (decrypt) {
+ for (i = 1; i < rounds; i++) {
+ av_aes_block tmp[3];
+ tmp[2] = a->round_key[i];
+ subshift(&tmp[1], 0, sbox);
mix(tmp, dec_multbl, 1, 3);
- memcpy(a->round_key[i][0], tmp[0], 16);
- }
- }else{
- for(i=0; i<(rounds+1)>>1; i++){
- for(j=0; j<16; j++)
- FFSWAP(int, a->round_key[i][0][j], a->round_key[rounds-i][0][j]);
+ a->round_key[i] = tmp[0];
}
+ } else {
+ for (i = 0; i < (rounds + 1) >> 1; i++)
+ FFSWAP(av_aes_block, a->round_key[i], a->round_key[rounds - i]);
}
return 0;
}
-
-#ifdef TEST
-#include "log.h"
-
-int main(){
- int i,j;
- AVAES ae, ad, b;
- uint8_t rkey[2][16]= {
- {0},
- {0x10, 0xa5, 0x88, 0x69, 0xd7, 0x4b, 0xe5, 0xa3, 0x74, 0xcf, 0x86, 0x7c, 0xfb, 0x47, 0x38, 0x59}};
- uint8_t pt[16], rpt[2][16]= {
- {0x6a, 0x84, 0x86, 0x7c, 0xd7, 0x7e, 0x12, 0xad, 0x07, 0xea, 0x1b, 0xe8, 0x95, 0xc5, 0x3f, 0xa3},
- {0}};
- uint8_t rct[2][16]= {
- {0x73, 0x22, 0x81, 0xc0, 0xa0, 0xaa, 0xb8, 0xf7, 0xa5, 0x4a, 0x0c, 0x67, 0xa0, 0xc4, 0x5e, 0xcf},
- {0x6d, 0x25, 0x1e, 0x69, 0x44, 0xb0, 0x51, 0xe0, 0x4e, 0xaa, 0x6f, 0xb4, 0xdb, 0xf7, 0x84, 0x65}};
- uint8_t temp[16];
-
- av_aes_init(&ae, "PI=3.141592654..", 128, 0);
- av_aes_init(&ad, "PI=3.141592654..", 128, 1);
- av_log_level= AV_LOG_DEBUG;
-
- for(i=0; i<2; i++){
- av_aes_init(&b, rkey[i], 128, 1);
- aes_crypt(&b, temp, rct[i], 1, NULL, 1);
- for(j=0; j<16; j++)
- if(rpt[i][j] != temp[j])
- av_log(NULL, AV_LOG_ERROR, "%d %02X %02X\n", j, rpt[i][j], temp[j]);
- }
-
- for(i=0; i<10000; i++){
- for(j=0; j<16; j++){
- pt[j]= random();
- }
-{START_TIMER
- aes_crypt(&ae, temp, pt, 1, NULL, 0);
- if(!(i&(i-1)))
- av_log(NULL, AV_LOG_ERROR, "%02X %02X %02X %02X\n", temp[0], temp[5], temp[10], temp[15]);
- aes_crypt(&ad, temp, temp, 1, NULL, 1);
-STOP_TIMER("aes")}
- for(j=0; j<16; j++){
- if(pt[j] != temp[j]){
- av_log(NULL, AV_LOG_ERROR, "%d %d %02X %02X\n", i,j, pt[j], temp[j]);
- }
- }
- }
- return 0;
-}
-#endif
projects / ffmpeg / blobdiff