1 files changed, 123 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/pubkey/curve25519/curve25519.h b/comm/third_party/botan/src/lib/pubkey/curve25519/curve25519.h
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index 0000000000..c2f8f42b33
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+++ b/comm/third_party/botan/src/lib/pubkey/curve25519/curve25519.h
@@ -0,0 +1,123 @@
+/*
+* Curve25519
+* (C) 2014 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_CURVE_25519_H_
+#define BOTAN_CURVE_25519_H_
+
+#include <botan/pk_keys.h>
+
+namespace Botan {
+
+class BOTAN_PUBLIC_API(2,0) Curve25519_PublicKey : public virtual Public_Key
+   {
+   public:
+      std::string algo_name() const override { return "Curve25519"; }
+
+      size_t estimated_strength() const override { return 128; }
+
+      size_t key_length() const override { return 255; }
+
+      bool check_key(RandomNumberGenerator& rng, bool strong) const override;
+
+      AlgorithmIdentifier algorithm_identifier() const override;
+
+      std::vector<uint8_t> public_key_bits() const override;
+
+      std::vector<uint8_t> public_value() const { return m_public; }
+
+      /**
+      * Create a Curve25519 Public Key.
+      * @param alg_id the X.509 algorithm identifier
+      * @param key_bits DER encoded public key bits
+      */
+      Curve25519_PublicKey(const AlgorithmIdentifier& alg_id,
+                           const std::vector<uint8_t>& key_bits);
+
+      /**
+      * Create a Curve25519 Public Key.
+      * @param pub 32-byte raw public key
+      */
+      explicit Curve25519_PublicKey(const std::vector<uint8_t>& pub) : m_public(pub) {}
+
+      /**
+      * Create a Curve25519 Public Key.
+      * @param pub 32-byte raw public key
+      */
+      explicit Curve25519_PublicKey(const secure_vector<uint8_t>& pub) :
+         m_public(pub.begin(), pub.end()) {}
+
+   protected:
+      Curve25519_PublicKey() = default;
+      std::vector<uint8_t> m_public;
+   };
+
+class BOTAN_PUBLIC_API(2,0) Curve25519_PrivateKey final : public Curve25519_PublicKey,
+                                        public virtual Private_Key,
+                                        public virtual PK_Key_Agreement_Key
+   {
+   public:
+      /**
+      * Construct a private key from the specified parameters.
+      * @param alg_id the X.509 algorithm identifier
+      * @param key_bits PKCS #8 structure
+      */
+      Curve25519_PrivateKey(const AlgorithmIdentifier& alg_id,
+                            const secure_vector<uint8_t>& key_bits);
+
+      /**
+      * Generate a private key.
+      * @param rng the RNG to use
+      */
+      explicit Curve25519_PrivateKey(RandomNumberGenerator& rng);
+
+      /**
+      * Construct a private key from the specified parameters.
+      * @param secret_key the private key
+      */
+      explicit Curve25519_PrivateKey(const secure_vector<uint8_t>& secret_key);
+
+      std::vector<uint8_t> public_value() const override { return Curve25519_PublicKey::public_value(); }
+
+      secure_vector<uint8_t> agree(const uint8_t w[], size_t w_len) const;
+
+      const secure_vector<uint8_t>& get_x() const { return m_private; }
+
+      secure_vector<uint8_t> private_key_bits() const override;
+
+      bool check_key(RandomNumberGenerator& rng, bool strong) const override;
+
+      std::unique_ptr<PK_Ops::Key_Agreement>
+         create_key_agreement_op(RandomNumberGenerator& rng,
+                                 const std::string& params,
+                                 const std::string& provider) const override;
+
+   private:
+      secure_vector<uint8_t> m_private;
+   };
+
+typedef Curve25519_PublicKey X25519_PublicKey;
+typedef Curve25519_PrivateKey X25519_PrivateKey;
+
+/*
+* The types above are just wrappers for curve25519_donna, plus defining
+* encodings for public and private keys.
+*/
+void BOTAN_PUBLIC_API(2,0) curve25519_donna(uint8_t mypublic[32],
+                                const uint8_t secret[32],
+                                const uint8_t basepoint[32]);
+
+/**
+* Exponentiate by the x25519 base point
+* @param mypublic output value
+* @param secret random scalar
+*/
+void BOTAN_PUBLIC_API(2,0) curve25519_basepoint(uint8_t mypublic[32],
+                                    const uint8_t secret[32]);
+
+}
+
+#endif