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shaN: code shrink

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function                                             old     new   delta
init512_lo                                            32      40      +8
init256                                               32      40      +8
sha256_begin                                          42      28     -14
sha512_begin                                          81      53     -28
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/2 up/down: 16/-42)            Total: -26 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-10-17 01:35:16 +02:00
parent 446c2349b6
commit a971a192e8
2 changed files with 12 additions and 7 deletions
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4
include/libbb.h
View File

@ -1514,7 +1514,7 @@ void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags);
typedef struct sha1_ctx_t {
uint32_t hash[8]; /* 5, +3 elements for sha256 */
uint64_t total64;
uint64_t total64; /* must be directly after hash[] */
uint8_t wbuffer[64]; /* NB: always correctly aligned for uint64_t */
void (*process_block)(struct sha1_ctx_t*) FAST_FUNC;
} sha1_ctx_t;
@ -1527,7 +1527,7 @@ void sha256_begin(sha256_ctx_t *ctx) FAST_FUNC;
#define sha256_end sha1_end
typedef struct sha512_ctx_t {
uint64_t hash[8];
uint64_t total64[2];
uint64_t total64[2]; /* must be directly after hash[] */
uint8_t wbuffer[128]; /* NB: always correctly aligned for uint64_t */
} sha512_ctx_t;
void sha512_begin(sha512_ctx_t *ctx) FAST_FUNC;

15
libbb/sha1.c
View File

@ -329,7 +329,9 @@ static const uint32_t init256[] = {
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19
0x5be0cd19,
0,
0,
};
static const uint32_t init512_lo[] = {
0xf3bcc908,
@ -339,7 +341,9 @@ static const uint32_t init512_lo[] = {
0xade682d1,
0x2b3e6c1f,
0xfb41bd6b,
0x137e2179
0x137e2179,
0,
0,
};
/* Initialize structure containing state of computation.
@ -347,7 +351,7 @@ static const uint32_t init512_lo[] = {
void FAST_FUNC sha256_begin(sha256_ctx_t *ctx)
{
memcpy(ctx->hash, init256, sizeof(init256));
ctx->total64 = 0;
/*ctx->total64 = 0; - done by extending init256 with two 32-bit zeros */
ctx->process_block = sha256_process_block64;
}
@ -356,9 +360,10 @@ void FAST_FUNC sha256_begin(sha256_ctx_t *ctx)
void FAST_FUNC sha512_begin(sha512_ctx_t *ctx)
{
int i;
for (i = 0; i < 8; i++)
/* Two extra iterations zero out ctx->total64[] */
for (i = 0; i < 8+2; i++)
ctx->hash[i] = ((uint64_t)(init256[i]) << 32) + init512_lo[i];
ctx->total64[0] = ctx->total64[1] = 0;
/*ctx->total64[0] = ctx->total64[1] = 0; - already done */
}