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crypto: support HMAC algorithms based on libgcrypt 

This patch add HMAC algorithms based on libgcrypt support

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Longpeng(Mike) 2016-12-13 18:42:57 +08:00 committed by Daniel P. Berrange
parent 12a4f2162a
commit 5ce9cfe737
1 changed files with 109 additions and 2 deletions
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111
crypto/hmac-gcrypt.c
View File

@ -17,8 +17,28 @@
#include "crypto/hmac.h"
#include <gcrypt.h>
static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = GCRY_MAC_HMAC_MD5,
[QCRYPTO_HASH_ALG_SHA1] = GCRY_MAC_HMAC_SHA1,
[QCRYPTO_HASH_ALG_SHA224] = GCRY_MAC_HMAC_SHA224,
[QCRYPTO_HASH_ALG_SHA256] = GCRY_MAC_HMAC_SHA256,
[QCRYPTO_HASH_ALG_SHA384] = GCRY_MAC_HMAC_SHA384,
[QCRYPTO_HASH_ALG_SHA512] = GCRY_MAC_HMAC_SHA512,
[QCRYPTO_HASH_ALG_RIPEMD160] = GCRY_MAC_HMAC_RMD160,
};
typedef struct QCryptoHmacGcrypt QCryptoHmacGcrypt;
struct QCryptoHmacGcrypt {
gcry_mac_hd_t handle;
};
bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
qcrypto_hmac_alg_map[alg] != GCRY_MAC_NONE) {
return true;
}
return false;
}
@ -26,12 +46,58 @@ QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
const uint8_t *key, size_t nkey,
Error **errp)
{
QCryptoHmac *hmac;
QCryptoHmacGcrypt *ctx;
gcry_error_t err;
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(QCryptoHmacGcrypt, 1);
err = gcry_mac_open(&ctx->handle, qcrypto_hmac_alg_map[alg],
GCRY_MAC_FLAG_SECURE, NULL);
if (err != 0) {
error_setg(errp, "Cannot initialize hmac: %s",
gcry_strerror(err));
goto error;
}
err = gcry_mac_setkey(ctx->handle, (const void *)key, nkey);
if (err != 0) {
error_setg(errp, "Cannot set key: %s",
gcry_strerror(err));
goto error;
}
hmac->opaque = ctx;
return hmac;
error:
g_free(ctx);
g_free(hmac);
return NULL;
}
void qcrypto_hmac_free(QCryptoHmac *hmac)
{
return;
QCryptoHmacGcrypt *ctx;
if (!hmac) {
return;
}
ctx = hmac->opaque;
gcry_mac_close(ctx->handle);
g_free(ctx);
g_free(hmac);
}
int qcrypto_hmac_bytesv(QCryptoHmac *hmac,
@ -41,5 +107,46 @@ int qcrypto_hmac_bytesv(QCryptoHmac *hmac,
size_t *resultlen,
Error **errp)
{
return -1;
QCryptoHmacGcrypt *ctx;
gcry_error_t err;
uint32_t ret;
int i;
ctx = hmac->opaque;
for (i = 0; i < niov; i++) {
gcry_mac_write(ctx->handle, iov[i].iov_base, iov[i].iov_len);
}
ret = gcry_mac_get_algo_maclen(qcrypto_hmac_alg_map[hmac->alg]);
if (ret <= 0) {
error_setg(errp, "Unable to get hmac length: %s",
gcry_strerror(ret));
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;
}
err = gcry_mac_read(ctx->handle, *result, resultlen);
if (err != 0) {
error_setg(errp, "Cannot get result: %s",
gcry_strerror(err));
return -1;
}
err = gcry_mac_reset(ctx->handle);
if (err != 0) {
error_setg(errp, "Cannot reset hmac context: %s",
gcry_strerror(err));
return -1;
}
return 0;
}