167 lines
3.8 KiB
C
167 lines
3.8 KiB
C
/*
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* QEMU Crypto hmac algorithms (based on glib)
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*
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* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
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*
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* Authors:
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* Longpeng(Mike) <longpeng2@huawei.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "crypto/hmac.h"
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/* Support for HMAC Algos has been added in GLib 2.30 */
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#if GLIB_CHECK_VERSION(2, 30, 0)
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static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
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[QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5,
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[QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1,
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[QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256,
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/* Support for HMAC SHA-512 in GLib 2.42 */
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#if GLIB_CHECK_VERSION(2, 42, 0)
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[QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
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#else
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[QCRYPTO_HASH_ALG_SHA512] = -1,
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#endif
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[QCRYPTO_HASH_ALG_SHA224] = -1,
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[QCRYPTO_HASH_ALG_SHA384] = -1,
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[QCRYPTO_HASH_ALG_RIPEMD160] = -1,
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};
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typedef struct QCryptoHmacGlib QCryptoHmacGlib;
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struct QCryptoHmacGlib {
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GHmac *ghmac;
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};
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bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
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{
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if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
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qcrypto_hmac_alg_map[alg] != -1) {
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return true;
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}
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return false;
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}
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QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
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const uint8_t *key, size_t nkey,
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Error **errp)
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{
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QCryptoHmac *hmac;
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QCryptoHmacGlib *ctx;
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if (!qcrypto_hmac_supports(alg)) {
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error_setg(errp, "Unsupported hmac algorithm %s",
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QCryptoHashAlgorithm_lookup[alg]);
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return NULL;
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}
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hmac = g_new0(QCryptoHmac, 1);
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hmac->alg = alg;
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ctx = g_new0(QCryptoHmacGlib, 1);
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ctx->ghmac = g_hmac_new(qcrypto_hmac_alg_map[alg],
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(const uint8_t *)key, nkey);
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if (!ctx->ghmac) {
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error_setg(errp, "Cannot initialize hmac and set key");
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goto error;
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}
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hmac->opaque = ctx;
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return hmac;
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error:
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g_free(ctx);
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g_free(hmac);
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return NULL;
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}
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void qcrypto_hmac_free(QCryptoHmac *hmac)
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{
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QCryptoHmacGlib *ctx;
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if (!hmac) {
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return;
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}
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ctx = hmac->opaque;
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g_hmac_unref(ctx->ghmac);
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g_free(ctx);
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g_free(hmac);
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}
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int qcrypto_hmac_bytesv(QCryptoHmac *hmac,
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const struct iovec *iov,
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size_t niov,
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uint8_t **result,
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size_t *resultlen,
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Error **errp)
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{
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QCryptoHmacGlib *ctx;
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int i, ret;
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ctx = hmac->opaque;
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for (i = 0; i < niov; i++) {
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g_hmac_update(ctx->ghmac, iov[i].iov_base, iov[i].iov_len);
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}
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ret = g_checksum_type_get_length(qcrypto_hmac_alg_map[hmac->alg]);
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if (ret < 0) {
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error_setg(errp, "Unable to get hmac length");
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return -1;
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}
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if (*resultlen == 0) {
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*resultlen = ret;
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*result = g_new0(uint8_t, *resultlen);
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} else if (*resultlen != ret) {
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error_setg(errp, "Result buffer size %zu is smaller than hmac %d",
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*resultlen, ret);
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return -1;
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}
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g_hmac_get_digest(ctx->ghmac, *result, resultlen);
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return 0;
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}
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#else
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bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
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{
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return false;
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}
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QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
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const uint8_t *key, size_t nkey,
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Error **errp)
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{
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return NULL;
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}
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void qcrypto_hmac_free(QCryptoHmac *hmac)
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{
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return;
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}
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int qcrypto_hmac_bytesv(QCryptoHmac *hmac,
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const struct iovec *iov,
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size_t niov,
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uint8_t **result,
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size_t *resultlen,
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Error **errp)
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{
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return -1;
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}
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#endif
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