From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53787) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cJhzx-0004mp-3L for qemu-devel@nongnu.org; Wed, 21 Dec 2016 09:36:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cJhzw-0006ho-5o for qemu-devel@nongnu.org; Wed, 21 Dec 2016 09:36:05 -0500 Received: from mx1.redhat.com ([209.132.183.28]:52862) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cJhzv-0006hQ-Ti for qemu-devel@nongnu.org; Wed, 21 Dec 2016 09:36:04 -0500 From: "Daniel P. Berrange" Date: Wed, 21 Dec 2016 14:35:39 +0000 Message-Id: <20161221143541.9260-6-berrange@redhat.com> In-Reply-To: <20161221143541.9260-1-berrange@redhat.com> References: <20161221143541.9260-1-berrange@redhat.com> Subject: [Qemu-devel] [PULL v1 5/7] crypto: support HMAC algorithms based on glib List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , "Longpeng(Mike)" , "Daniel P . Berrange" From: "Longpeng(Mike)" This patch add glib-backed HMAC algorithms support Signed-off-by: Longpeng(Mike) Signed-off-by: Daniel P. Berrange --- crypto/hmac-glib.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) diff --git a/crypto/hmac-glib.c b/crypto/hmac-glib.c index 3e2a933..08a1fdd 100644 --- a/crypto/hmac-glib.c +++ b/crypto/hmac-glib.c @@ -16,6 +16,126 @@ #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 + [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; +} + +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) +{ + 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(QCryptoHashAlgorithm alg) { return false; @@ -42,3 +162,5 @@ int qcrypto_hmac_bytesv(QCryptoHmac *hmac, { return -1; } + +#endif -- 2.9.3