/*
* Compute hash value from current state of ctx
* state of hash ctx becomes invalid and cannot be used for further
* hashing.
*/
int finish_hash (gost_hash_ctx * ctx, byte * hashval)
{
byte buf[32];
byte H[32];
byte S[32];
ghosthash_len fin_len = ctx->len;
byte *bptr;
memcpy (H, ctx->H, 32);
memcpy (S, ctx->S, 32);
if (ctx->left)
{
memset (buf, 0, 32);
memcpy (buf, ctx->remainder, ctx->left);
hash_step (ctx->cipher_ctx, H, buf);
add_blocks (32, S, buf);
fin_len += ctx->left;
}
memset (buf, 0, 32);
bptr = buf;
fin_len <<= 3; /* Hash length in BITS!! */
while (fin_len > 0)
{
*(bptr++) = (byte) (fin_len & 0xFF);
fin_len >>= 8;
};
hash_step (ctx->cipher_ctx, H, buf);
hash_step (ctx->cipher_ctx, H, S);
memcpy (hashval, H, 32);
return 1;
}
/*
* Hash block of arbitrary length
*
*
*/
int hash_block(gost_hash_ctx * ctx, const byte * block, size_t length)
{
if (ctx->left) {
/*
* There are some bytes from previous step
*/
unsigned int add_bytes = 32 - ctx->left;
if (add_bytes > length) {
add_bytes = length;
}
memcpy(&(ctx->remainder[ctx->left]), block, add_bytes);
ctx->left += add_bytes;
if (ctx->left < 32) {
return 1;
}
block += add_bytes;
length -= add_bytes;
hash_step(ctx->cipher_ctx, ctx->H, ctx->remainder);
add_blocks(32, ctx->S, ctx->remainder);
ctx->len += 32;
ctx->left = 0;
}
while (length >= 32) {
hash_step(ctx->cipher_ctx, ctx->H, block);
add_blocks(32, ctx->S, block);
ctx->len += 32;
block += 32;
length -= 32;
}
if (length) {
memcpy(ctx->remainder, block, ctx->left = length);
}
return 1;
}
static void
GOSTR341194_block_data_order(GOSTR341194_CTX *ctx, const void *p, size_t num)
{
int i;
for (i = 0; i < num; i++) {
hash_step(ctx, ctx->H, p);
add_blocks(32, ctx->S, p);
p += 32;
}
}
/*
* Hash block of arbitrary length
*
*
*/
int hash_block(gost_hash_ctx *ctx,const byte *block, size_t length)
{
const byte *curptr=block;
const byte *barrier=block+(length-32);/* Last byte we can safely hash*/
if (ctx->left)
{
/*There are some bytes from previous step*/
unsigned int add_bytes = 32-ctx->left;
if (add_bytes>length)
{
add_bytes = length;
}
TINYCLR_SSL_MEMCPY(&(ctx->remainder[ctx->left]),block,add_bytes);
ctx->left+=add_bytes;
if (ctx->left<32)
{
return 1;
}
curptr=block+add_bytes;
hash_step(ctx->cipher_ctx,ctx->H,ctx->remainder);
add_blocks(32,ctx->S,ctx->remainder);
ctx->len+=32;
ctx->left=0;
}
while (curptr<=barrier)
{
hash_step(ctx->cipher_ctx,ctx->H,curptr);
add_blocks(32,ctx->S,curptr);
ctx->len+=32;
curptr+=32;
}
if (curptr!=block+length)
{
ctx->left=block+length-curptr;
TINYCLR_SSL_MEMCPY(ctx->remainder,curptr,ctx->left);
}
return 1;
}
int
GOSTR341194_Final(unsigned char *md, GOSTR341194_CTX * c)
{
unsigned char *p = (unsigned char *)c->data;
unsigned char T[32];
if (c->num > 0) {
memset(p + c->num, 0, 32);
hash_step(c, c->H, p);
add_blocks(32, c->S, p);
}
p = T;
HOST_l2c(c->Nl, p);
HOST_l2c(c->Nh, p);
memset(p, 0, 32 - 8);
hash_step(c, c->H, T);
hash_step(c, c->H, c->S);
memcpy(md, c->H, 32);
return 1;
}
