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author | Daniel P. Berrangé <berrange@redhat.com> | 2021-06-25 18:32:14 +0100 |
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committer | Daniel P. Berrangé <berrange@redhat.com> | 2021-07-14 14:15:52 +0100 |
commit | 9a85ca050aa4e7624615e9ae95cf54d5640c6804 (patch) | |
tree | c2760c25e45607c5b0052a90e2e708252ade72e0 /crypto | |
parent | 3d2b61ffcd4a5a8f5bfcdb2be5eac1a37f5caaa1 (diff) | |
download | qemu-9a85ca050aa4e7624615e9ae95cf54d5640c6804.zip qemu-9a85ca050aa4e7624615e9ae95cf54d5640c6804.tar.gz qemu-9a85ca050aa4e7624615e9ae95cf54d5640c6804.tar.bz2 |
crypto: add gnutls hash provider
This adds support for using gnutls as a provider of the crypto
hash APIs.
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Diffstat (limited to 'crypto')
-rw-r--r-- | crypto/hash-gnutls.c | 104 | ||||
-rw-r--r-- | crypto/meson.build | 2 |
2 files changed, 106 insertions, 0 deletions
diff --git a/crypto/hash-gnutls.c b/crypto/hash-gnutls.c new file mode 100644 index 0000000..17911ac --- /dev/null +++ b/crypto/hash-gnutls.c @@ -0,0 +1,104 @@ +/* + * QEMU Crypto hash algorithms + * + * Copyright (c) 2021 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + * + */ + +#include "qemu/osdep.h" +#include <gnutls/crypto.h> +#include "qapi/error.h" +#include "crypto/hash.h" +#include "hashpriv.h" + + +static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = { + [QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5, + [QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1, + [QCRYPTO_HASH_ALG_SHA224] = GNUTLS_DIG_SHA224, + [QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256, + [QCRYPTO_HASH_ALG_SHA384] = GNUTLS_DIG_SHA384, + [QCRYPTO_HASH_ALG_SHA512] = GNUTLS_DIG_SHA512, + [QCRYPTO_HASH_ALG_RIPEMD160] = GNUTLS_DIG_RMD160, +}; + +gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg) +{ + size_t i; + const gnutls_digest_algorithm_t *algs; + if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) || + qcrypto_hash_alg_map[alg] == GNUTLS_DIG_UNKNOWN) { + return false; + } + algs = gnutls_digest_list(); + for (i = 0; algs[i] != GNUTLS_DIG_UNKNOWN; i++) { + if (algs[i] == qcrypto_hash_alg_map[alg]) { + return true; + } + } + return false; +} + + +static int +qcrypto_gnutls_hash_bytesv(QCryptoHashAlgorithm alg, + const struct iovec *iov, + size_t niov, + uint8_t **result, + size_t *resultlen, + Error **errp) +{ + int i, ret; + gnutls_hash_hd_t hash; + + if (!qcrypto_hash_supports(alg)) { + error_setg(errp, + "Unknown hash algorithm %d", + alg); + return -1; + } + + ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]); + 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 hash %d", + *resultlen, ret); + return -1; + } + + ret = gnutls_hash_init(&hash, qcrypto_hash_alg_map[alg]); + if (ret < 0) { + error_setg(errp, + "Unable to initialize hash algorithm: %s", + gnutls_strerror(ret)); + return -1; + } + + for (i = 0; i < niov; i++) { + gnutls_hash(hash, iov[i].iov_base, iov[i].iov_len); + } + + gnutls_hash_deinit(hash, *result); + return 0; +} + + +QCryptoHashDriver qcrypto_hash_lib_driver = { + .hash_bytesv = qcrypto_gnutls_hash_bytesv, +}; diff --git a/crypto/meson.build b/crypto/meson.build index f3bab7c..e2f2581 100644 --- a/crypto/meson.build +++ b/crypto/meson.build @@ -28,6 +28,8 @@ if nettle.found() endif elif gcrypt.found() crypto_ss.add(gcrypt, files('hash-gcrypt.c', 'hmac-gcrypt.c', 'pbkdf-gcrypt.c')) +elif gnutls_crypto.found() + crypto_ss.add(gnutls, files('hash-gnutls.c', 'hmac-glib.c', 'pbkdf-stub.c') else crypto_ss.add(files('hash-glib.c', 'hmac-glib.c', 'pbkdf-stub.c')) endif |