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Small code size optimization for RIPEMD-160 when compiled for boot encryption.

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This commit is contained in:
Mounir IDRASSI
2014-10-14 17:22:51 +02:00
parent 922a09b634
commit 905a3ff4a5
1 changed files with 9 additions and 7 deletions
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16
src/Crypto/Rmd160.c
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@@ -68,17 +68,18 @@ void RMD160Init (RMD160_CTX *ctx)
void RMD160Update (RMD160_CTX *ctx, const unsigned char *input, unsigned __int32 lenArg)
{
#ifndef TC_WINDOWS_BOOT
uint64 len = lenArg, have, need;
uint64 len = lenArg;
#else
uint32 len = lenArg, have, need;
uint32 len = lenArg;
#endif
unsigned int have, need;
/* Check how many bytes we already have and how many more we need. */
have = ((ctx->count >> 3) & (RIPEMD160_BLOCK_LENGTH - 1));
have = (unsigned int) ((ctx->count) & (RIPEMD160_BLOCK_LENGTH - 1));
need = RIPEMD160_BLOCK_LENGTH - have;
/* Update bitcount */
ctx->count += len << 3;
ctx->count += len;
if (len >= need) {
if (have != 0) {
@@ -114,15 +115,16 @@ static void RMD160Pad(RMD160_CTX *ctx)
/* Convert count to 8 bytes in little endian order. */
#ifndef TC_WINDOWS_BOOT
PUT_64BIT_LE(count, ctx->count);
uint64 bitcount = ctx->count << 3;
PUT_64BIT_LE(count, bitcount);
#else
*(uint32 *) (count + 4) = 0;
*(uint32 *) (count + 0) = ctx->count;
*(uint32 *) (count + 0) = ctx->count << 3;
#endif
/* Pad out to 56 mod 64. */
padlen = RIPEMD160_BLOCK_LENGTH -
(uint32)((ctx->count >> 3) & (RIPEMD160_BLOCK_LENGTH - 1));
(uint32)((ctx->count) & (RIPEMD160_BLOCK_LENGTH - 1));
if (padlen < 1 + 8)
padlen += RIPEMD160_BLOCK_LENGTH;
RMD160Update(ctx, PADDING, padlen - 8); /* padlen - 8 <= 64 */