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ffmpeg
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Use pointer to hash transform function to make adding SHA-2 support easier. 

Originally committed as revision 19388 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2009-07-09 07:23:43 +00:00
parent 3a7c65077d
commit 2c6361e009
1 changed files with 6 additions and 3 deletions
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9
libavutil/sha1.c
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@ -29,6 +29,8 @@ typedef struct AVSHA1 {
uint64_t count; ///< number of bytes in buffer
uint8_t buffer[64]; ///< 512-bit buffer of input values used in hash updating
uint32_t state[8]; ///< current hash value
/** function used to update hash for 512-bit input block */
void (*transform)(uint32_t *state, const uint8_t buffer[64]);
} AVSHA1;
const int av_sha1_size = sizeof(AVSHA1);
@ -132,6 +134,7 @@ void av_sha1_init(AVSHA1* ctx)
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
ctx->transform = transform;
ctx->count = 0;
}
@ -145,16 +148,16 @@ void av_sha1_update(AVSHA1* ctx, const uint8_t* data, unsigned int len)
for (i = 0; i < len; i++) {
ctx->buffer[j++] = data[i];
if (64 == j) {
transform(ctx->state, ctx->buffer);
ctx->transform(ctx->state, ctx->buffer);
j = 0;
}
}
#else
if ((j + len) > 63) {
memcpy(&ctx->buffer[j], data, (i = 64 - j));
transform(ctx->state, ctx->buffer);
ctx->transform(ctx->state, ctx->buffer);
for (; i + 63 < len; i += 64)
transform(ctx->state, &data[i]);
ctx->transform(ctx->state, &data[i]);
j = 0;
} else
i = 0;