1 files changed, 97 insertions, 0 deletions
diff --git a/src/knot/nameserver/tsig_ctx.h b/src/knot/nameserver/tsig_ctx.h
new file mode 100644
index 0000000..256ada3
--- /dev/null
+++ b/src/knot/nameserver/tsig_ctx.h
@@ -0,0 +1,97 @@
+/*  Copyright (C) 2015 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/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#include "libknot/packet/pkt.h"
+#include "libknot/tsig.h"
+
+#define TSIG_MAX_DIGEST_SIZE 64
+
+/*!
+  \brief TSIG context.
+ */
+typedef struct tsig_ctx {
+	const knot_tsig_key_t *key;
+	uint64_t prev_signed_time;
+
+	uint8_t digest[TSIG_MAX_DIGEST_SIZE];
+	size_t digest_size;
+
+	/* Unsigned packets handling. */
+	unsigned unsigned_count;
+	uint8_t *buffer;
+	size_t buffer_used;
+	size_t buffer_size;
+} tsig_ctx_t;
+
+/*!
+ * \brief Initialize TSIG context.
+ *
+ * \param ctx  TSIG context to be initialized.
+ * \param key  Key to be used for signing. If NULL, all performed operations
+ *             will do nothing and always successful.
+ */
+void tsig_init(tsig_ctx_t *ctx, const knot_tsig_key_t *key);
+
+/*!
+ * \brief Cleanup TSIG context.
+ *
+ * \param ctx TSIG context to be cleaned up.
+ */
+void tsig_cleanup(tsig_ctx_t *ctx);
+
+/*!
+ * \brief Reset TSIG context for new message exchange.
+ */
+void tsig_reset(tsig_ctx_t *ctx);
+
+/*!
+ * \brief Sign outgoing packet.
+ *
+ * \param ctx     TSIG signing context.
+ * \param packet  Packet to be signed.
+ *
+ * \return Error code, KNOT_EOK if successful.
+ */
+int tsig_sign_packet(tsig_ctx_t *ctx, knot_pkt_t *packet);
+
+/*!
+ * \brief Verify incoming packet.
+ *
+ * If the packet is not signed, the function will succeed, but an internal
+ * counter of unsigned packets is increased. When a packet is signed, the
+ * same counter is reset to zero.
+ *
+ * \see tsig_unsigned_count
+ *
+ * \param ctx     TSIG signing context.
+ * \param packet  Packet to be verified.
+ *
+ * \return Error code, KNOT_EOK if successful.
+ */
+int tsig_verify_packet(tsig_ctx_t *ctx, knot_pkt_t *packet);
+
+/*!
+ * \brief Get number of unsigned packets since the last signed one.
+ *
+ * \param ctx  TSIG signing context.
+ *
+ * \return Number of unsigned packets since the last signed one.
+ */
+unsigned tsig_unsigned_count(tsig_ctx_t *ctx);