void hb_hmac_sha512_init(hmac_sha512_ctx *ctx, const void *keyv,
unsigned int key_size)
{
unsigned int fill;
unsigned int num;
const unsigned char *key = ( const unsigned char * ) keyv;
const unsigned char *key_used;
unsigned char key_temp[SHA512_DIGEST_SIZE];
unsigned int i;
if (key_size == SHA512_BLOCK_SIZE) {
key_used = key;
num = SHA512_BLOCK_SIZE;
} else {
if (key_size > SHA512_BLOCK_SIZE){
hb_sha512(key, key_size, key_temp);
key_used = key_temp;
num = SHA512_DIGEST_SIZE;
} else { /* key_size > SHA512_BLOCK_SIZE */
key_used = key;
num = key_size;
}
fill = SHA512_BLOCK_SIZE - num;
memset(ctx->block_ipad + num, 0x36, fill);
memset(ctx->block_opad + num, 0x5c, fill);
}
for (i = 0; i < num; i++) {
ctx->block_ipad[i] = key_used[i] ^ 0x36;
ctx->block_opad[i] = key_used[i] ^ 0x5c;
}
hb_sha512_init(&ctx->ctx_inside);
hb_sha512_update(&ctx->ctx_inside, ctx->block_ipad, SHA512_BLOCK_SIZE);
hb_sha512_init(&ctx->ctx_outside);
hb_sha512_update(&ctx->ctx_outside, ctx->block_opad,
SHA512_BLOCK_SIZE);
/* for hmac_reinit */
memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside,
sizeof(sha512_ctx));
memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside,
sizeof(sha512_ctx));
}
void hb_sha512( const void * message, unsigned int len,
unsigned char * digest )
{
sha512_ctx ctx;
hb_sha512_init( &ctx );
hb_sha512_update( &ctx, message, len );
hb_sha512_final( &ctx, digest );
}