#include "common.h"
#include "aes.h"
+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 r7471).
- uint8_t round_key[15][4][4];
- uint8_t state[2][4][4];
+ av_aes_block round_key[15];
+ av_aes_block state[2];
int rounds;
}AVAES;
static uint32_t dec_multbl[4][256];
#endif
-static inline void addkey(uint64_t dst[2], const uint64_t src[2], const uint64_t round_key[2]){
- dst[0] = src[0] ^ round_key[0];
- dst[1] = src[1] ^ round_key[1];
+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, const 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 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[4][256], int a, int b, int c, int d){
+static inline int mix_core(uint32_t multbl[][256], int a, int b, int c, int d){
#if CONFIG_SMALL
#define ROT(x,s) ((x<<s)|(x>>(32-s)))
return multbl[0][a] ^ ROT(multbl[0][b], 8) ^ ROT(multbl[0][c], 16) ^ ROT(multbl[0][d], 24);
#endif
}
-static inline void mix(uint8_t state[2][4][4], uint32_t multbl[4][256], int s1, int s3){
- ((uint32_t *)(state))[0] = mix_core(multbl, state[1][0][0], state[1][s1 ][1], state[1][2][2], state[1][s3 ][3]);
- ((uint32_t *)(state))[1] = mix_core(multbl, state[1][1][0], state[1][s3-1][1], state[1][3][2], state[1][s1-1][3]);
- ((uint32_t *)(state))[2] = mix_core(multbl, state[1][2][0], state[1][s3 ][1], state[1][0][2], state[1][s1 ][3]);
- ((uint32_t *)(state))[3] = mix_core(multbl, state[1][3][0], state[1][s1-1][1], state[1][1][2], 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, const uint8_t *sbox, const 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]);
+ 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 av_aes_crypt(AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt){
+void av_aes_crypt(AVAES *a, uint8_t *dst_, const uint8_t *src_, int count, uint8_t *iv_, int decrypt){
+ av_aes_block *dst = (av_aes_block *)dst_;
+ const av_aes_block *src = (const av_aes_block *)src_;
+ av_aes_block *iv = (av_aes_block *)iv_;
while(count--){
- addkey(a->state[1], src, a->round_key[a->rounds]);
+ addkey(&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);
+ addkey(&a->state[0], &a->state[0], iv);
memcpy(iv, src, 16);
}
- addkey(dst, a->state[0], a->round_key[0]);
+ addkey(dst, &a->state[0], &a->round_key[0]);
}else{
- if(iv) addkey(a->state[1], a->state[1], iv);
+ 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]);
+ addkey(dst, &a->state[0], &a->round_key[0]);
if(iv) memcpy(iv, dst, 16);
}
- src+=16;
- dst+=16;
+ src++;
+ dst++;
}
}
uint8_t log8[256];
uint8_t alog8[512];
- if(!enc_multbl[0][sizeof(enc_multbl)/sizeof(enc_multbl[0][0])-1]){
+ 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]=
memcpy(tk, key, KC*4);
for(t= 0; t < (rounds+1)*16;) {
- memcpy(a->round_key[0][0]+t, tk, KC*4);
+ memcpy(a->round_key[0].u8+t, tk, KC*4);
t+= KC*4;
for(i = 0; i < 4; i++)
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);
+ av_aes_block tmp[3];
+ memcpy(&tmp[2], &a->round_key[i], 16);
+ subshift(&tmp[1], 0, sbox);
mix(tmp, dec_multbl, 1, 3);
- memcpy(a->round_key[i][0], tmp[0], 16);
+ memcpy(&a->round_key[i], &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]);
+ FFSWAP(int, a->round_key[i].u8[j], a->round_key[rounds-i].u8[j]);
}
}
projects / ffmpeg / blobdiff