153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/*
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* QEMU Crypto hmac algorithms (based on libgcrypt)
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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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#include <gcrypt.h>
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static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
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[QCRYPTO_HASH_ALG_MD5] = GCRY_MAC_HMAC_MD5,
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[QCRYPTO_HASH_ALG_SHA1] = GCRY_MAC_HMAC_SHA1,
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[QCRYPTO_HASH_ALG_SHA224] = GCRY_MAC_HMAC_SHA224,
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[QCRYPTO_HASH_ALG_SHA256] = GCRY_MAC_HMAC_SHA256,
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[QCRYPTO_HASH_ALG_SHA384] = GCRY_MAC_HMAC_SHA384,
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[QCRYPTO_HASH_ALG_SHA512] = GCRY_MAC_HMAC_SHA512,
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[QCRYPTO_HASH_ALG_RIPEMD160] = GCRY_MAC_HMAC_RMD160,
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};
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typedef struct QCryptoHmacGcrypt QCryptoHmacGcrypt;
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struct QCryptoHmacGcrypt {
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gcry_mac_hd_t handle;
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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] != GCRY_MAC_NONE) {
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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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QCryptoHmacGcrypt *ctx;
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gcry_error_t err;
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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(QCryptoHmacGcrypt, 1);
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err = gcry_mac_open(&ctx->handle, qcrypto_hmac_alg_map[alg],
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GCRY_MAC_FLAG_SECURE, NULL);
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if (err != 0) {
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error_setg(errp, "Cannot initialize hmac: %s",
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gcry_strerror(err));
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goto error;
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}
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err = gcry_mac_setkey(ctx->handle, (const void *)key, nkey);
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if (err != 0) {
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error_setg(errp, "Cannot set key: %s",
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gcry_strerror(err));
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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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QCryptoHmacGcrypt *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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gcry_mac_close(ctx->handle);
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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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QCryptoHmacGcrypt *ctx;
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gcry_error_t err;
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uint32_t ret;
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int i;
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ctx = hmac->opaque;
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for (i = 0; i < niov; i++) {
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gcry_mac_write(ctx->handle, iov[i].iov_base, iov[i].iov_len);
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}
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ret = gcry_mac_get_algo_maclen(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: %s",
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gcry_strerror(ret));
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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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err = gcry_mac_read(ctx->handle, *result, resultlen);
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if (err != 0) {
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error_setg(errp, "Cannot get result: %s",
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gcry_strerror(err));
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return -1;
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}
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err = gcry_mac_reset(ctx->handle);
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if (err != 0) {
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error_setg(errp, "Cannot reset hmac context: %s",
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gcry_strerror(err));
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return -1;
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}
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return 0;
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}
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