diff options
| author | Daniel P. Berrange <berrange@redhat.com> | 2015-10-23 16:14:50 +0100 |
|---|---|---|
| committer | Daniel P. Berrange <berrange@redhat.com> | 2015-12-23 11:02:20 +0000 |
| commit | 7b36064c90c377d07d30904318d6cbfe5a133af1 (patch) | |
| tree | 4917e5ef7d40794be96dcd37db562d8917e21f2b | |
| parent | dd2bf9eb95f875f0ad6a15aecb48cfc8b739fcbc (diff) | |
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>
| -rw-r--r-- | crypto/hash.c | 15 | ||||
| -rw-r--r-- | include/crypto/hash.h | 11 | ||||
| -rw-r--r-- | tests/test-crypto-hash.c | 5 |
3 files changed, 31 insertions, 0 deletions
diff --git a/crypto/hash.c b/crypto/hash.c index 81e74de868..5a47b90ec0 100644 --- a/crypto/hash.c +++ b/crypto/hash.c @@ -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, diff --git a/include/crypto/hash.h b/include/crypto/hash.h index b5acbf638c..3d1812442f 100644 --- a/include/crypto/hash.h +++ b/include/crypto/hash.h @@ -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 diff --git a/tests/test-crypto-hash.c b/tests/test-crypto-hash.c index 911437e60d..3ec31dde7b 100644 --- a/tests/test-crypto-hash.c +++ b/tests/test-crypto-hash.c @@ -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, |