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simplify round_key generation by writing over the end but ensuring that theres some irrelevant stuff afterwards

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Originally committed as revision 7471 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-01-14 13:46:20 +00:00
parent 84c72fb129
commit ba554c025e
1 changed files with 4 additions and 4 deletions
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8
libavutil/aes.c
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@ -23,8 +23,8 @@
#include "aes.h"
typedef struct AVAES{
uint8_t state[4][4];
uint8_t round_key[15][4][4];
uint8_t state[4][4];
int rounds;
}AVAES;
@ -143,9 +143,9 @@ AVAES *av_aes_init(uint8_t *key, int key_bits) {
memcpy(tk, key, KC*4);
for(t= 0; t < (rounds+1)*4; ) {
for(j = 0; j < KC && t < (rounds+1)*4; j++, t++)
memcpy(a->round_key[0][t], tk[j], 4);
for(t= 0; t < (rounds+1)*4;) {
memcpy(a->round_key[0][t], tk, KC*4);
t+= KC;
for(i = 0; i < 4; i++)
tk[0][i] ^= sbox[tk[KC-1][(i+1)&3]];