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diff --git a/libtransport/includes/hicn/transport/security/signer.h b/libtransport/includes/hicn/transport/security/signer.h
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+++ b/libtransport/includes/hicn/transport/security/signer.h
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+/*
+ * Copyright (c) 2017-2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <hicn/transport/core/packet.h>
+
+extern "C" {
+#include <parc/security/parc_CryptoHashType.h>
+#include <parc/security/parc_CryptoSuite.h>
+#include <parc/security/parc_KeyStore.h>
+#include <parc/security/parc_Signer.h>
+#include <parc/security/parc_SymmetricKeySigner.h>
+}
+
+namespace utils {
+
+using Packet = transport::core::Packet;
+
+/**
+ * A signer can use a single key (asymmetric or symmetric) to sign a packet.
+ */
+class Signer {
+  friend class Identity;
+
+ public:
+  /**
+   * Create a Signer
+   *
+   * @param keyStore A keystore containing a private key or simmetric key to
+   * use to sign packet with this Signer.
+   * @param suite CryptoSuite to use to verify the signature
+   */
+  Signer(PARCKeyStore *keyStore, CryptoSuite suite);
+
+  /**
+   * Create a Signer
+   *
+   * @param passphrase A string from which the symmetric key will be derived
+   * @param suite CryptoSuite to use to verify the signature
+   */
+  Signer(const std::string &passphrase, CryptoSuite suite);
+
+  Signer(const PARCSigner *signer, CryptoSuite suite);
+
+  Signer(const PARCSigner *signer);
+
+  ~Signer();
+
+  /**
+   * @brief Sign a packet
+   *
+   * This method is general and must be used for Public-private key signature,
+   * HMAC and CRC.
+   *
+   * @param packet A pointer to the header of the packet to sign. Mutable
+   * field in the packet must be set to 0.
+   * @param key_id Indentifier of the key to use to generate the signature.
+   */
+  void sign(Packet &packet);
+
+  size_t getSignatureLength();
+
+  PARCKeyStore *getKeyStore();
+
+ private:
+  PARCBufferComposer *composer_ = nullptr;
+  PARCBuffer *key_buffer_ = nullptr;
+  PARCSymmetricKeyStore *symmetricKeyStore_ = nullptr;
+  PARCSigner *signer_ = nullptr;
+  PARCSignature *signature_ = nullptr;
+  PARCKeyId *key_id_ = nullptr;
+  CryptoSuite suite_;
+  size_t signature_length_;
+  static uint8_t zeros[200];
+};
+
+}  // namespace utils