/* * 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" /* 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; } 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; } #else bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg) { return false; } void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg, const uint8_t *key, size_t nkey, Error **errp) { return NULL; } static void qcrypto_glib_hmac_ctx_free(QCryptoHmac *hmac) { return; } static int qcrypto_glib_hmac_bytesv(QCryptoHmac *hmac, const struct iovec *iov, size_t niov, uint8_t **result, size_t *resultlen, Error **errp) { return -1; } #endif QCryptoHmacDriver qcrypto_hmac_lib_driver = { .hmac_bytesv = qcrypto_glib_hmac_bytesv, .hmac_free = qcrypto_glib_hmac_ctx_free, };