Adding upstream version 2.7.6.upstream/2.7.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 163 insertions, 0 deletions

diff --git a/src/libdnssec/key/algorithm.c b/src/libdnssec/key/algorithm.c
new file mode 100644
index 0000000..84f5386
--- /dev/null
+++ b/src/libdnssec/key/algorithm.c
@@ -0,0 +1,163 @@
+/*  Copyright (C) 2018 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 <http://www.gnu.org/licenses/>.
+*/
+
+#include <gnutls/gnutls.h>
+
+#include "libdnssec/error.h"
+#include "libdnssec/key.h"
+#include "libdnssec/key/algorithm.h"
+#include "libdnssec/shared/shared.h"
+
+/* -- internal ------------------------------------------------------------- */
+
+struct limits {
+	unsigned min;
+	unsigned max;
+	unsigned def;
+	bool (*validate)(unsigned bits);
+};
+
+static const struct limits *get_limits(dnssec_key_algorithm_t algorithm)
+{
+	static const struct limits RSA = {
+		.min = 1024,
+		.max = 4096,
+		.def = 2048,
+	};
+
+	static const struct limits EC256 = {
+		.min = 256,
+		.max = 256,
+		.def = 256,
+	};
+
+	static const struct limits EC384 = {
+		.min = 384,
+		.max = 384,
+		.def = 384,
+	};
+
+	static const struct limits ED25519 = {
+		.min = 256,
+		.max = 256,
+		.def = 256,
+	};
+
+	static const struct limits ED448 = {
+		.min = 456,
+		.max = 456,
+		.def = 456,
+	};
+
+	switch (algorithm) {
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA1:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA1_NSEC3:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA256:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA512:
+		return &RSA;
+	case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
+		return &EC256;
+	case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
+		return &EC384;
+	case DNSSEC_KEY_ALGORITHM_ED25519:
+		return &ED25519;
+	case DNSSEC_KEY_ALGORITHM_ED448:
+		return &ED448;
+	default:
+		return NULL;
+	}
+}
+
+/* -- internal API --------------------------------------------------------- */
+
+gnutls_pk_algorithm_t algorithm_to_gnutls(dnssec_key_algorithm_t dnssec)
+{
+	switch (dnssec) {
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA1:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA1_NSEC3:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA256:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA512:
+		return GNUTLS_PK_RSA;
+	case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
+	case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
+		return GNUTLS_PK_EC;
+	case DNSSEC_KEY_ALGORITHM_ED25519:
+#ifdef HAVE_ED25519
+		return GNUTLS_PK_EDDSA_ED25519;
+#endif
+	case DNSSEC_KEY_ALGORITHM_ED448:
+	default:
+		return GNUTLS_PK_UNKNOWN;
+	}
+}
+
+/* -- public API ----------------------------------------------------------- */
+
+_public_
+bool dnssec_algorithm_key_support(dnssec_key_algorithm_t algo)
+{
+	return algorithm_to_gnutls(algo) != GNUTLS_PK_UNKNOWN;
+}
+
+_public_
+int dnssec_algorithm_key_size_range(dnssec_key_algorithm_t algorithm,
+				    unsigned *min_ptr, unsigned *max_ptr)
+{
+	if (!min_ptr && !max_ptr) {
+		return DNSSEC_EINVAL;
+	}
+
+	const struct limits *limits = get_limits(algorithm);
+	if (!limits) {
+		return DNSSEC_INVALID_KEY_ALGORITHM;
+	}
+
+	if (min_ptr) {
+		*min_ptr = limits->min;
+	}
+	if (max_ptr) {
+		*max_ptr = limits->max;
+	}
+
+	return DNSSEC_EOK;
+}
+
+_public_
+bool dnssec_algorithm_key_size_check(dnssec_key_algorithm_t algorithm,
+				     unsigned bits)
+{
+	const struct limits *limits = get_limits(algorithm);
+	if (!limits) {
+		return false;
+	}
+
+	if (bits < limits->min || bits > limits->max) {
+		return false;
+	}
+
+	if (limits->validate && !limits->validate(bits)) {
+		return false;
+	}
+
+	return true;
+}
+
+_public_
+int dnssec_algorithm_key_size_default(dnssec_key_algorithm_t algorithm)
+{
+	const struct limits *limits = get_limits(algorithm);
+	return limits ? limits->def : 0;
+}