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crypto: add ability to query hash digest len 

Add a qcrypto_hash_digest_len() method which allows querying of
the raw digest size for a given hash algorithm.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2015-10-23 16:14:50 +01:00
parent dd2bf9eb95
commit 7b36064c90
3 changed files with 31 additions and 0 deletions
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15
crypto/hash.c
View File

@ -30,6 +30,12 @@ static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG_LAST] = {
[QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256,
};
static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG_LAST] = {
[QCRYPTO_HASH_ALG_MD5] = 16,
[QCRYPTO_HASH_ALG_SHA1] = 20,
[QCRYPTO_HASH_ALG_SHA256] = 32,
};
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map)) {
@ -38,6 +44,15 @@ gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
return false;
}
size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
{
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_size)) {
return 0;
}
return qcrypto_hash_alg_size[alg];
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov,

11
include/crypto/hash.h
View File

@ -44,6 +44,17 @@ typedef enum {
*/
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg);
/**
* qcrypto_hash_digest_len:
* @alg: the hash algorithm
*
* Determine the size of the hash digest in bytes
*
* Returns: the digest length in bytes
*/
size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg);
/**
* qcrypto_hash_bytesv:
* @alg: the hash algorithm

5
tests/test-crypto-hash.c
View File

@ -163,6 +163,11 @@ static void test_hash_digest(void)
for (i = 0; i < G_N_ELEMENTS(expected_outputs) ; i++) {
int ret;
char *digest;
size_t digestsize;
digestsize = qcrypto_hash_digest_len(i);
g_assert_cmpint(digestsize * 2, ==, strlen(expected_outputs[i]));
ret = qcrypto_hash_digest(i,
INPUT_TEXT,