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/*
* 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_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 key_length() const override { return 255; }
bool check_key(RandomNumberGenerator& rng, bool strong) const override;
AlgorithmIdentifier algorithm_identifier() const override;
std::vector<byte> x509_subject_public_key() const override;
std::vector<byte> 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<byte>& key_bits);
/**
* Create a Curve25519 Public Key.
* @param pub 32-byte raw public key
*/
explicit Curve25519_PublicKey(const std::vector<byte>& pub) : m_public(pub) {}
/**
* Create a Curve25519 Public Key.
* @param pub 32-byte raw public key
*/
explicit Curve25519_PublicKey(const secure_vector<byte>& pub) :
m_public(pub.begin(), pub.end()) {}
protected:
Curve25519_PublicKey() {}
std::vector<byte> 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<byte>& 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<byte>& secret_key);
std::vector<byte> public_value() const override { return Curve25519_PublicKey::public_value(); }
secure_vector<byte> agree(const byte w[], size_t w_len) const;
const secure_vector<byte>& get_x() const { return m_private; }
secure_vector<byte> pkcs8_private_key() 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<byte> m_private;
};
/*
* The types above are just wrappers for curve25519_donna, plus defining
* encodings for public and private keys.
*/
void BOTAN_DLL 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_DLL curve25519_basepoint(uint8_t mypublic[32],
const uint8_t secret[32]);
}
#endif
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