1 files changed, 121 insertions, 0 deletions
diff --git a/libtransport/includes/hicn/transport/auth/signer.h b/libtransport/includes/hicn/transport/auth/signer.h
new file mode 100644
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+++ b/libtransport/includes/hicn/transport/auth/signer.h
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+/*
+ * Copyright (c) 2021 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/auth/common.h>
+#include <hicn/transport/auth/crypto_hash.h>
+#include <hicn/transport/auth/crypto_suite.h>
+#include <hicn/transport/errors/errors.h>
+#include <hicn/transport/utils/membuf.h>
+
+#include <memory>
+extern "C" {
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
+#include <openssl/pkcs12.h>
+#include <openssl/x509.h>
+}
+
+namespace transport {
+namespace auth {
+
+class Signer {
+  // The base class from which all signer classes derive.
+
+ public:
+  Signer();
+
+  virtual ~Signer();
+
+  // Sign a packet.
+  virtual void signPacket(PacketPtr packet);
+  virtual void signBuffer(const uint8_t *buffer, std::size_t len);
+  virtual void signBuffer(const std::vector<uint8_t> &buffer);
+  virtual void signBuffer(const utils::MemBuf *buffer);
+
+  // Return the signature.
+  const utils::MemBuf::Ptr &getSignature() const;
+
+  // Return the signature as a string.
+  std::string getStringSignature() const;
+
+  // Return the signature size in bytes.
+  virtual std::size_t getSignatureSize() const;
+
+  // Return the field size necessary to hold the signature. The field size is
+  // always a multiple of 4. Use this function when allocating the signature
+  // packet header.
+  virtual std::size_t getSignatureFieldSize() const;
+
+  // Return the crypto suite associated to the signer.
+  CryptoSuite getSuite() const;
+
+  // Return the hash algorithm associated to the signer.
+  CryptoHashType getHashType() const;
+
+  // Print signature to stdout.
+  void display();
+
+ protected:
+  CryptoSuite suite_;
+  utils::MemBuf::Ptr signature_;
+  std::size_t signature_len_;
+  std::shared_ptr<EVP_PKEY> key_;
+  CryptoHash key_id_;
+};
+
+class VoidSigner : public Signer {
+  // This class is the default socket signer. It does not sign packet.
+ public:
+  VoidSigner() = default;
+
+  void signPacket(PacketPtr packet) override;
+  void signBuffer(const uint8_t *buffer, std::size_t len) override;
+  void signBuffer(const std::vector<uint8_t> &buffer) override;
+  void signBuffer(const utils::MemBuf *buffer) override;
+};
+
+class AsymmetricSigner : public Signer {
+  // This class uses asymmetric verification to sign packets.
+ public:
+  AsymmetricSigner() = default;
+
+  // Create an AsymmetricSigner from a keystore file (.p12).
+  AsymmetricSigner(std::string keystore_path, std::string password);
+
+  // Construct an AsymmetricSigner from a key store and a given crypto
+  // suite.
+  AsymmetricSigner(CryptoSuite suite, std::shared_ptr<EVP_PKEY> key,
+                   std::shared_ptr<EVP_PKEY> pub_key);
+
+  void setKey(CryptoSuite suite, std::shared_ptr<EVP_PKEY> key,
+              std::shared_ptr<EVP_PKEY> pub_key);
+
+  std::size_t getSignatureFieldSize() const override;
+};
+
+class SymmetricSigner : public Signer {
+  // This class uses symmetric verification to sign packets. The symmetric
+  // key is derived from a passphrase.
+ public:
+  SymmetricSigner() = default;
+
+  // Construct a SymmetricSigner from a passphrase and a given crypto suite.
+  SymmetricSigner(CryptoSuite suite, const std::string &passphrase);
+};
+
+}  // namespace auth
+}  // namespace transport