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diff --git a/src/libdnssec/sign.h b/src/libdnssec/sign.h
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+/*  Copyright (C) 2020 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/>.
+ */
+
+/*!
+ * \file
+ *
+ * \addtogroup sign
+ *
+ * \brief DNSSEC signing API
+ *
+ * The module provides the low level DNSSEC signing and verification.
+ *
+ * @{
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <libdnssec/binary.h>
+#include <libdnssec/key.h>
+
+struct dnssec_sign_ctx;
+
+typedef enum {
+	DNSSEC_SIGN_NORMAL       = 0,
+	DNSSEC_SIGN_REPRODUCIBLE = (1 << 0),
+} dnssec_sign_flags_t;
+
+/*!
+ * DNSSEC signing context.
+ */
+typedef struct dnssec_sign_ctx dnssec_sign_ctx_t;
+
+/*!
+ * Create new DNSSEC signing context.
+ *
+ * \note \ref dnssec_sign_init is called as a part of this function.
+ *
+ * \param ctx_ptr  Pointer to context to be allocated.
+ * \param key      DNSSEC key to be used.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_sign_new(dnssec_sign_ctx_t **ctx_ptr, const dnssec_key_t *key);
+
+/*!
+ * Free DNSSEC signing context.
+ *
+ * \param ctx  Signing context to be freed.
+ */
+void dnssec_sign_free(dnssec_sign_ctx_t *ctx);
+
+/*!
+ * Reinitialize DNSSEC signing context to start a new operation.
+ *
+ * \param ctx  Signing context.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_sign_init(dnssec_sign_ctx_t *ctx);
+
+/*!
+ * Add data to be covered by DNSSEC signature.
+ *
+ * \param ctx   Signing context.
+ * \param data  Data to be signed.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_sign_add(dnssec_sign_ctx_t *ctx, const dnssec_binary_t *data);
+
+/*!
+ * Write down the DNSSEC signature.
+ *
+ * \param ctx        Signing context.
+ * \param flags      Additional flags to be used for signing.
+ * \param signature  Signature to be allocated and written.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_sign_write(dnssec_sign_ctx_t *ctx, dnssec_sign_flags_t flags,
+                      dnssec_binary_t *signature);
+
+/*!
+ * Verify DNSSEC signature.
+ *
+ * \param ctx        Signing context.
+ * \param sign_cmp   Verify by signing and comparing signatures.
+ *                   Not possible for non-deterministic algorithms!
+ * \param signature  Signature to be verified.
+ *
+ * \return Error code.
+ * \retval DNSSEC_EOK                Validation successful, valid signature.
+ * \retval DNSSEC_INVALID_SIGNATURE  Validation successful, invalid signature.
+ */
+int dnssec_sign_verify(dnssec_sign_ctx_t *ctx, bool sign_cmp,
+                       const dnssec_binary_t *signature);
+
+/*! @} */