[Ffmpeg-cvslog] r7503 - trunk/libavutil/aes.c
michael
subversion
Sun Jan 14 22:30:54 CET 2007
Author: michael
Date: Sun Jan 14 22:30:54 2007
New Revision: 7503
Modified:
trunk/libavutil/aes.c
Log:
simplify multiply table init
Modified: trunk/libavutil/aes.c
==============================================================================
--- trunk/libavutil/aes.c (original)
+++ trunk/libavutil/aes.c Sun Jan 14 22:30:54 2007
@@ -99,15 +99,25 @@
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){
int i;
for(i=0; i<1024; i++){
int x= sbox[i/4];
if(x) tbl[i]= alog8[ log8[x] + log8[c[i&3]] ];
}
+#ifndef CONFIG_SMALL
+ init_multbl3(tbl);
+#endif
}
-
// this is based on the reference AES code by Paulo Barreto and Vincent Rijmen
AVAES *av_aes_init(uint8_t *key, int key_bits, int decrypt) {
AVAES *a;
@@ -136,17 +146,7 @@
// av_log(NULL, AV_LOG_ERROR, "%d, ", log8[i]);
}
init_multbl2(dec_multbl[0], (int[4]){0xe, 0x9, 0xd, 0xb}, log8, alog8, inv_sbox);
-#ifndef CONFIG_SMALL
- init_multbl2(dec_multbl[1], (int[4]){0xb, 0xe, 0x9, 0xd}, log8, alog8, inv_sbox);
- init_multbl2(dec_multbl[2], (int[4]){0xd, 0xb, 0xe, 0x9}, log8, alog8, inv_sbox);
- init_multbl2(dec_multbl[3], (int[4]){0x9, 0xd, 0xb, 0xe}, log8, alog8, inv_sbox);
-#endif
init_multbl2(enc_multbl[0], (int[4]){0x2, 0x1, 0x1, 0x3}, log8, alog8, sbox);
-#ifndef CONFIG_SMALL
- init_multbl2(enc_multbl[1], (int[4]){0x3, 0x2, 0x1, 0x1}, log8, alog8, sbox);
- init_multbl2(enc_multbl[2], (int[4]){0x1, 0x3, 0x2, 0x1}, log8, alog8, sbox);
- init_multbl2(enc_multbl[3], (int[4]){0x1, 0x1, 0x3, 0x2}, log8, alog8, sbox);
-#endif
}
if(key_bits!=128 && key_bits!=192 && key_bits!=256)
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