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[Qemu-devel] [PATCH for-2.9 v3 4/6] crypto: support HMAC algorithms base
From: |
Longpeng(Mike) |
Subject: |
[Qemu-devel] [PATCH for-2.9 v3 4/6] crypto: support HMAC algorithms based on glibc |
Date: |
Tue, 13 Dec 2016 15:01:51 +0800 |
This patch add glibc-backed HMAC algorithms support
Signed-off-by: Longpeng(Mike) <address@hidden>
---
crypto/hmac-glib.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 97 insertions(+), 2 deletions(-)
diff --git a/crypto/hmac-glib.c b/crypto/hmac-glib.c
index 3e2a933..f07c841 100644
--- a/crypto/hmac-glib.c
+++ b/crypto/hmac-glib.c
@@ -16,8 +16,40 @@
#include "qapi/error.h"
#include "crypto/hmac.h"
+static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
+/* Support for HMAC Algos has been added in GLib 2.30 */
+#if GLIB_CHECK_VERSION(2, 30, 0)
+ [QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5,
+ [QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1,
+ [QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256,
+#else
+ [QCRYPTO_HASH_ALG_MD5] = -1,
+ [QCRYPTO_HASH_ALG_SHA1] = -1,
+ [QCRYPTO_HASH_ALG_SHA256] = -1,
+#endif
+/* 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
+ [QCRYPTO_HASH_ALG_SHA224] = -1,
+ [QCRYPTO_HASH_ALG_SHA384] = -1,
+ [QCRYPTO_HASH_ALG_RIPEMD160] = -1,
+};
+
+typedef struct QCryptoHmacGlib QCryptoHmacGlib;
+struct QCryptoHmacGlib {
+ GHmac *ghmac;
+};
+
bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
{
+ if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
+ qcrypto_hmac_alg_map[alg] != -1) {
+ return true;
+ }
+
return false;
}
@@ -25,12 +57,49 @@ QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm 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",
+ QCryptoHashAlgorithm_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)
{
- return;
+ 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,
@@ -40,5 +109,31 @@ int qcrypto_hmac_bytesv(QCryptoHmac *hmac,
size_t *resultlen,
Error **errp)
{
- return -1;
+ 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;
}
--
1.8.3.1
- [Qemu-devel] [PATCH for-2.9 v3 0/6] crypto: add HMAC algorithms support, Longpeng(Mike), 2016/12/13
- [Qemu-devel] [PATCH for-2.9 v3 2/6] crypto: add HMAC algorithms framework, Longpeng(Mike), 2016/12/13
- [Qemu-devel] [PATCH for-2.9 v3 1/6] configure: add CONFIG_GCRYPT_HMAC item, Longpeng(Mike), 2016/12/13
- [Qemu-devel] [PATCH for-2.9 v3 5/6] crypto: support HMAC algorithms based on nettle, Longpeng(Mike), 2016/12/13
- [Qemu-devel] [PATCH for-2.9 v3 3/6] crypto: support HMAC algorithms based on libgcrypt, Longpeng(Mike), 2016/12/13
- [Qemu-devel] [PATCH for-2.9 v3 4/6] crypto: support HMAC algorithms based on glibc,
Longpeng(Mike) <=
- [Qemu-devel] [PATCH for-2.9 v3 6/6] crypto: add HMAC algorithms testcases, Longpeng(Mike), 2016/12/13
- Re: [Qemu-devel] [PATCH for-2.9 v3 0/6] crypto: add HMAC algorithms support, no-reply, 2016/12/13
- Re: [Qemu-devel] [PATCH for-2.9 v3 0/6] crypto: add HMAC algorithms support, Daniel P. Berrange, 2016/12/13