This patch add glibc-backed HMAC algorithms support
Signed-off-by: Longpeng(Mike) <longpe...@huawei.com>
---
crypto/hmac-glib.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 119 insertions(+)
diff --git a/crypto/hmac-glib.c b/crypto/hmac-glib.c
index 42f63c6..6a5f722 100644
--- a/crypto/hmac-glib.c
+++ b/crypto/hmac-glib.c
@@ -16,6 +16,123 @@
#include "qapi/error.h"
#include "crypto/hmac.h"
+/* Support for HMAC Algos has been added in GLib 2.30 */
+#if GLIB_CHECK_VERSION(2, 30, 0)
+
+static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
+ [QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5,
+ [QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1,
+ [QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256,
+/* Support for HMAC SHA-512 in GLib 2.42 */
+#if GLIB_CHECK_VERSION(2, 42, 0)
+ [QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
+#else
+ [QCRYPTO_HASH_ALG_SHA512] = -1,
+#endif
+};
+
+typedef struct QCryptoHmacGlib QCryptoHmacGlib;
+struct QCryptoHmacGlib {
+ GHmac *ghmac;
+};
+
+bool qcrypto_hmac_supports(QCryptoHmacAlgorithm alg)
+{
+ if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
+ qcrypto_hmac_alg_map[alg] != -1) {
+ return true;
+ }
+
+ return false;
+}
+
+QCryptoHmac *qcrypto_hmac_new(QCryptoHmacAlgorithm alg,
+ const uint8_t *key, size_t nkey,
+ Error **errp)
+{
+ QCryptoHmac *hmac;
+ QCryptoHmacGlib *ctx;
+
+ if (!qcrypto_hmac_supports(alg)) {
+ error_setg(errp, "Unsupported hmac algorithm %s",
+ QCryptoHmacAlgorithm_lookup[alg]);
+ return NULL;
+ }
+
+ hmac = g_new0(QCryptoHmac, 1);
+ hmac->alg = alg;
+
+ ctx = g_new0(QCryptoHmacGlib, 1);
+
+ ctx->ghmac = g_hmac_new(qcrypto_hmac_alg_map[alg],
+ (const uint8_t *)key, nkey);
+ if (!ctx->ghmac) {
+ error_setg(errp, "Cannot initialize hmac and set key");
+ goto error;
+ }
+
+ hmac->opaque = ctx;
+ return hmac;
+
+error:
+ g_free(ctx);
+ g_free(hmac);
+ return NULL;
+}
+
+void qcrypto_hmac_free(QCryptoHmac *hmac)
+{
+ QCryptoHmacGlib *ctx;
+
+ if (!hmac) {
+ return;
+ }
+
+ ctx = hmac->opaque;
+ g_hmac_unref(ctx->ghmac);
+
+ g_free(ctx);
+ g_free(hmac);
+}
+
+int qcrypto_hmac_bytesv(QCryptoHmac *hmac,
+ const struct iovec *iov,
+ size_t niov,
+ uint8_t **result,
+ size_t *resultlen,
+ Error **errp)
+{
+ QCryptoHmacGlib *ctx;
+ int i, ret;
+
+ ctx = hmac->opaque;
+
+ for (i = 0; i < niov; i++) {
+ g_hmac_update(ctx->ghmac, iov[i].iov_base, iov[i].iov_len);
+ }
+
+ ret = g_checksum_type_get_length(qcrypto_hmac_alg_map[hmac->alg]);
+ if (ret < 0) {
+ error_setg(errp, "Unable to get hmac length");
+ return -1;
+ }
+
+ if (*resultlen == 0) {
+ *resultlen = ret;
+ *result = g_new0(uint8_t, *resultlen);
+ } else if (*resultlen != ret) {
+ error_setg(errp, "Result buffer size %zu is smaller than hmac %d",
+ *resultlen, ret);
+ return -1;
+ }
+
+ g_hmac_get_digest(ctx->ghmac, *result, resultlen);
+
+ return 0;
+}
+
+#else
+
bool qcrypto_hmac_supports(QCryptoHmacAlgorithm alg)
{
return false;
@@ -42,3 +159,5 @@ int qcrypto_hmac_bytesv(QCryptoHmac *hmac,
{
return -1;
}
+
+#endif
--
1.8.3.1
