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- /*
- * QEMU Crypto hmac algorithms (based on glib)
- *
- * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
- *
- * Authors:
- * Longpeng(Mike) <longpeng2@huawei.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or
- * (at your option) any later version. See the COPYING file in the
- * top-level directory.
- *
- */
- #include "qemu/osdep.h"
- #include "qapi/error.h"
- #include "crypto/hmac.h"
- #include "hmacpriv.h"
- 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,
- [QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
- [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;
- }
- void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
- const uint8_t *key, size_t nkey,
- Error **errp)
- {
- QCryptoHmacGlib *ctx;
- if (!qcrypto_hmac_supports(alg)) {
- error_setg(errp, "Unsupported hmac algorithm %s",
- QCryptoHashAlgorithm_str(alg));
- return NULL;
- }
- 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;
- }
- return ctx;
- error:
- g_free(ctx);
- return NULL;
- }
- static void
- qcrypto_glib_hmac_ctx_free(QCryptoHmac *hmac)
- {
- QCryptoHmacGlib *ctx;
- ctx = hmac->opaque;
- g_hmac_unref(ctx->ghmac);
- g_free(ctx);
- }
- static int
- qcrypto_glib_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;
- }
- QCryptoHmacDriver qcrypto_hmac_lib_driver = {
- .hmac_bytesv = qcrypto_glib_hmac_bytesv,
- .hmac_free = qcrypto_glib_hmac_ctx_free,
- };
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