mirror of https://gitlab.com/qemu-project/qemu
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/*
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* X.509 certificate related helpers
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*
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* Copyright (c) 2024 Dorjoy Chowdhury <dorjoychy111@gmail.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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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "crypto/x509-utils.h"
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#include <gnutls/gnutls.h>
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#include <gnutls/crypto.h>
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#include <gnutls/x509.h>
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static const int qcrypto_to_gnutls_hash_alg_map[QCRYPTO_HASH_ALGO__MAX] = {
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[QCRYPTO_HASH_ALGO_MD5] = GNUTLS_DIG_MD5,
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[QCRYPTO_HASH_ALGO_SHA1] = GNUTLS_DIG_SHA1,
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[QCRYPTO_HASH_ALGO_SHA224] = GNUTLS_DIG_SHA224,
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[QCRYPTO_HASH_ALGO_SHA256] = GNUTLS_DIG_SHA256,
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[QCRYPTO_HASH_ALGO_SHA384] = GNUTLS_DIG_SHA384,
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[QCRYPTO_HASH_ALGO_SHA512] = GNUTLS_DIG_SHA512,
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[QCRYPTO_HASH_ALGO_RIPEMD160] = GNUTLS_DIG_RMD160,
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};
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int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size,
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QCryptoHashAlgo alg,
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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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int ret = -1;
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int hlen;
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gnutls_x509_crt_t crt;
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gnutls_datum_t datum = {.data = cert, .size = size};
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if (alg >= G_N_ELEMENTS(qcrypto_to_gnutls_hash_alg_map)) {
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error_setg(errp, "Unknown hash algorithm");
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return -1;
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}
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if (result == NULL) {
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error_setg(errp, "No valid buffer given");
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return -1;
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}
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gnutls_x509_crt_init(&crt);
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if (gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM) != 0) {
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error_setg(errp, "Failed to import certificate");
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goto cleanup;
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}
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hlen = gnutls_hash_get_len(qcrypto_to_gnutls_hash_alg_map[alg]);
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if (*resultlen < hlen) {
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error_setg(errp,
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"Result buffer size %zu is smaller than hash %d",
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*resultlen, hlen);
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goto cleanup;
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}
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if (gnutls_x509_crt_get_fingerprint(crt,
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qcrypto_to_gnutls_hash_alg_map[alg],
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result, resultlen) != 0) {
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error_setg(errp, "Failed to get fingerprint from certificate");
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goto cleanup;
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}
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ret = 0;
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cleanup:
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gnutls_x509_crt_deinit(crt);
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return ret;
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}
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