diff options
| -rw-r--r-- | gosthash94.c | 43 | ||||
| -rw-r--r-- | gosthash94.h | 5 |
2 files changed, 12 insertions, 36 deletions
diff --git a/gosthash94.c b/gosthash94.c index 37a7f322..749e9e5b 100644 --- a/gosthash94.c +++ b/gosthash94.c @@ -283,6 +283,8 @@ gost_compute_sum_and_hash (struct gosthash94_ctx *ctx, const uint8_t *block, gost_block_compress (ctx, block_le, sbox); } +#define COMPRESS(ctx, block) gost_compute_sum_and_hash((ctx), (block), sbox); + /** * Calculate message hash. * Can be called repeatedly with chunks of the message to be hashed. @@ -296,33 +298,7 @@ gosthash94_update_int (struct gosthash94_ctx *ctx, size_t length, const uint8_t *msg, const uint32_t sbox[4][256]) { - unsigned index = (unsigned) ctx->length & 31; - ctx->length += length; - - /* fill partial block */ - if (index) - { - unsigned left = GOSTHASH94_BLOCK_SIZE - index; - memcpy (ctx->message + index, msg, (length < left ? length : left)); - if (length < left) - return; - - /* process partial block */ - gost_compute_sum_and_hash (ctx, ctx->message, sbox); - msg += left; - length -= left; - } - while (length >= GOSTHASH94_BLOCK_SIZE) - { - gost_compute_sum_and_hash (ctx, msg, sbox); - msg += GOSTHASH94_BLOCK_SIZE; - length -= GOSTHASH94_BLOCK_SIZE; - } - if (length) - { - /* save leftovers */ - memcpy (ctx->message, msg, length); - } + MD_UPDATE(ctx, length, msg, COMPRESS, ctx->count++); } /** @@ -368,21 +344,20 @@ gosthash94_write_digest (struct gosthash94_ctx *ctx, size_t length, uint8_t *result, const uint32_t sbox[4][256]) { - unsigned index = ctx->length & 31; - uint32_t msg32[8]; + uint32_t msg32[GOSTHASH94_BLOCK_SIZE / 4]; assert(length <= GOSTHASH94_DIGEST_SIZE); /* pad the last block with zeroes and hash it */ - if (index > 0) + if (ctx->index > 0) { - memset (ctx->message + index, 0, 32 - index); - gost_compute_sum_and_hash (ctx, ctx->message, sbox); + memset (ctx->block + ctx->index, 0, GOSTHASH94_BLOCK_SIZE - ctx->index); + gost_compute_sum_and_hash (ctx, ctx->block, sbox); } /* hash the message length and the sum */ - msg32[0] = ctx->length << 3; - msg32[1] = ctx->length >> 29; + msg32[0] = (ctx->count << 8) | (ctx->index << 3); + msg32[1] = ctx->count >> 24; memset (msg32 + 2, 0, sizeof (uint32_t) * 6); gost_block_compress (ctx, msg32, sbox); diff --git a/gosthash94.h b/gosthash94.h index fb45c576..02fd3b33 100644 --- a/gosthash94.h +++ b/gosthash94.h @@ -89,8 +89,9 @@ struct gosthash94_ctx { uint32_t hash[8]; /* algorithm 256-bit state */ uint32_t sum[8]; /* sum of processed message blocks */ - uint64_t length; /* number of processed bytes */ - uint8_t message[GOSTHASH94_BLOCK_SIZE]; /* 256-bit buffer for leftovers */ + uint64_t count; /* Block count */ + unsigned index; /* Into buffer */ + uint8_t block[GOSTHASH94_BLOCK_SIZE]; /* 256-bit buffer for leftovers */ }; #define gosthash94cp_ctx gosthash94_ctx |