Commit 7b36064c authored by Daniel P. Berrangé's avatar Daniel P. Berrangé
Browse files

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: default avatarEric Blake <eblake@redhat.com>
Signed-off-by: default avatarDaniel P. Berrange <berrange@redhat.com>
parent dd2bf9eb

crypto/hash.c

+15 −0
Original line number Diff line number Diff line
@@ -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,

include/crypto/hash.h

+11 −0
Original line number Diff line number Diff line
@@ -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

tests/test-crypto-hash.c

+5 −0
Original line number Diff line number Diff line
@@ -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,