1 files changed, 99 insertions, 0 deletions
diff --git a/lib/crypto/gkdi.h b/lib/crypto/gkdi.h
new file mode 100644
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--- /dev/null
+++ b/lib/crypto/gkdi.h
@@ -0,0 +1,99 @@
+/*
+   Unix SMB/CIFS implementation.
+   Group Key Distribution Protocol functions
+
+   Copyright (C) Catalyst.Net Ltd 2023
+
+   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/>.
+*/
+
+#ifndef LIB_CRYPTO_GKDI_H
+#define LIB_CRYPTO_GKDI_H
+
+#include <stdint.h>
+
+#include <gnutls/gnutls.h>
+
+#include "lib/util/data_blob.h"
+
+#include "libcli/util/ntstatus.h"
+
+#include "librpc/gen_ndr/misc.h"
+#include "lib/util/time.h"
+#include "talloc.h"
+
+enum KdfAlgorithmId {
+	KDF_ALGORITHM_SP800_108_CTR_HMAC,
+};
+
+enum KdfSp800_108Param {
+	KDF_PARAM_SHA1,
+	KDF_PARAM_SHA256,
+	KDF_PARAM_SHA384,
+	KDF_PARAM_SHA512,
+};
+
+struct KdfAlgorithm {
+	union {
+		enum KdfSp800_108Param sp800_108;
+	} param;
+	enum KdfAlgorithmId id;
+};
+
+enum {
+	root_key_version_1 = 1,
+};
+
+struct ProvRootKey {
+	struct GUID id;
+	DATA_BLOB data;
+	NTTIME create_time;
+	NTTIME use_start_time;
+	const char *domain_id;
+	struct KdfAlgorithm kdf_algorithm;
+	int32_t version;
+};
+
+struct Gkid {
+	int32_t l0_idx;
+	int8_t l1_idx; /* [range(0, 31)] */
+	int8_t l2_idx; /* [range(0, 31)] */
+};
+
+enum GkidType {
+	GKID_DEFAULT = -1,
+	GKID_L0_SEED_KEY = 0,
+	GKID_L1_SEED_KEY = 1,
+	GKID_L2_SEED_KEY = 2,
+};
+
+static const int gkdi_l1_key_iteration = 32;
+static const int gkdi_l2_key_iteration = 32;
+
+static const int64_t gkdi_key_cycle_duration = 360000000000;
+static const int64_t gkdi_max_clock_skew = 3000000000;
+
+#define GKDI_KEY_LEN 64
+
+gnutls_mac_algorithm_t get_sp800_108_mac_algorithm(
+	const struct KdfAlgorithm kdf_algorithm);
+
+NTSTATUS compute_seed_key(
+	TALLOC_CTX *mem_ctx,
+	const DATA_BLOB target_security_descriptor,
+	const struct ProvRootKey *const root_key,
+	const struct Gkid gkid,
+	uint8_t out[static const GKDI_KEY_LEN]);
+
+#endif /* LIB_CRYPTO_GKDI_H */