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simplify

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Originally committed as revision 7504 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-01-14 21:40:21 +00:00
parent 7200f5d054
commit 597e3232ef
1 changed files with 4 additions and 10 deletions
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14
libavutil/aes.c
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@ -99,22 +99,16 @@ void av_aes_encrypt(AVAES *a){
crypt(a, 2, sbox, enc_multbl); crypt(a, 2, sbox, enc_multbl);
} }
static void init_multbl3(uint8_t tbl[4][256][4]){
int i, j, k;
for(k=1; k<4; k++)
for(j=0; j<256; j++)
for(i=0; i<4; i++)
tbl[k][j][i]= tbl[k-1][j][(i-1)&3];
}
static void init_multbl2(uint8_t tbl[1024], int c[4], uint8_t *log8, uint8_t *alog8, uint8_t *sbox){ static void init_multbl2(uint8_t tbl[1024], int c[4], uint8_t *log8, uint8_t *alog8, uint8_t *sbox){
int i; int i, j;
for(i=0; i<1024; i++){ for(i=0; i<1024; i++){
int x= sbox[i/4]; int x= sbox[i/4];
if(x) tbl[i]= alog8[ log8[x] + log8[c[i&3]] ]; if(x) tbl[i]= alog8[ log8[x] + log8[c[i&3]] ];
} }
#ifndef CONFIG_SMALL #ifndef CONFIG_SMALL
init_multbl3(tbl); for(j=256; j<1024; j++)
for(i=0; i<4; i++)
tbl[4*j+i]= tbl[4*j + ((i-1)&3) - 1024];
#endif #endif
} }