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/* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "libdnssec/digest.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include "libdnssec/shared/shared.h"
struct dnssec_digest_ctx {
gnutls_hash_hd_t gtctx;
unsigned size;
};
static gnutls_digest_algorithm_t lookup_algorithm(dnssec_digest_t algorithm)
{
switch (algorithm) {
case DNSSEC_DIGEST_SHA384: return GNUTLS_DIG_SHA384;
case DNSSEC_DIGEST_SHA512: return GNUTLS_DIG_SHA512;
default:
return GNUTLS_DIG_UNKNOWN;
};
}
_public_
int dnssec_digest_init(dnssec_digest_t algorithm, dnssec_digest_ctx_t **out_ctx)
{
if (out_ctx == NULL) {
return DNSSEC_EINVAL;
}
gnutls_digest_algorithm_t gtalg = lookup_algorithm(algorithm);
if (gtalg == GNUTLS_DIG_UNKNOWN) {
return DNSSEC_INVALID_DIGEST_ALGORITHM;
}
dnssec_digest_ctx_t *res = malloc(sizeof(*res));
if (res == NULL) {
return DNSSEC_ENOMEM;
}
res->size = gnutls_hash_get_len(gtalg);
if (res->size == 0 || gnutls_hash_init(&res->gtctx, gtalg) < 0) {
free(res);
return DNSSEC_DIGEST_ERROR;
}
*out_ctx = res;
return DNSSEC_EOK;
}
static void digest_ctx_free(dnssec_digest_ctx_t *ctx)
{
free_gnutls_hash_ptr(&ctx->gtctx);
free(ctx);
}
_public_
int dnssec_digest(dnssec_digest_ctx_t *ctx, dnssec_binary_t *data)
{
if (ctx == NULL || data == NULL) {
return DNSSEC_EINVAL;
}
int r = gnutls_hash(ctx->gtctx, data->data, data->size);
if (r != 0) {
digest_ctx_free(ctx);
return DNSSEC_DIGEST_ERROR;
}
return DNSSEC_EOK;
}
_public_
int dnssec_digest_finish(dnssec_digest_ctx_t *ctx, dnssec_binary_t *out)
{
if (ctx == NULL || out == NULL) {
return DNSSEC_EINVAL;
}
int r = dnssec_binary_resize(out, ctx->size);
if (r < 0) {
dnssec_binary_free(out);
digest_ctx_free(ctx);
return r;
}
gnutls_hash_output(ctx->gtctx, out->data);
digest_ctx_free(ctx);
return DNSSEC_EOK;
}
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