/* * 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 namespace Botan { class BOTAN_DLL 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 max_input_bits() const override { return 256; } bool check_key(RandomNumberGenerator& rng, bool strong) const override; AlgorithmIdentifier algorithm_identifier() const override; std::vector x509_subject_public_key() const override; std::vector public_value() const { return m_public; } /** * Create a Curve25519 Public Key. * @param alg_id the X.509 algorithm identifier * @param key_bits X.509 subject public key info structure */ Curve25519_PublicKey(const AlgorithmIdentifier& alg_id, const secure_vector& key_bits); /** * Create a Curve25519 Public Key. * @param pub 32-byte raw public key */ explicit Curve25519_PublicKey(const std::vector& pub) : m_public(pub) {} /** * Create a Curve25519 Public Key. * @param pub 32-byte raw public key */ explicit Curve25519_PublicKey(const secure_vector& pub) : m_public(pub.begin(), pub.end()) {} protected: Curve25519_PublicKey() {} std::vector m_public; }; class BOTAN_DLL Curve25519_PrivateKey : 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& 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 DER encoded private key bits */ explicit Curve25519_PrivateKey(const secure_vector& secret_key); std::vector public_value() const override { return Curve25519_PublicKey::public_value(); } secure_vector agree(const byte w[], size_t w_len) const; const secure_vector& get_x() const { return m_private; } secure_vector pkcs8_private_key() const override; bool check_key(RandomNumberGenerator& rng, bool strong) const override; std::unique_ptr create_key_agreement_op(RandomNumberGenerator& rng, const std::string& params, const std::string& provider) const override; private: secure_vector m_private; }; /* * The types above are just wrappers for curve25519_donna, plus defining * encodings for public and private keys. */ int BOTAN_DLL curve25519_donna(uint8_t mypublic[32], const uint8_t secret[32], const uint8_t basepoint[32]); } #endif