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/*
* Curve25519
* (C) 2014 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_CURVE_25519_H__
#define BOTAN_CURVE_25519_H__
#include <botan/pk_keys.h>
#include <botan/pk_ops.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 max_input_bits() const { return 256; }
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 unlock(m_public); }
Curve25519_PublicKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits);
Curve25519_PublicKey(const secure_vector<byte>& pub) : m_public(pub) {}
protected:
Curve25519_PublicKey() {}
secure_vector<byte> m_public;
};
class BOTAN_DLL Curve25519_PrivateKey : public Curve25519_PublicKey,
public virtual Private_Key,
public virtual PK_Key_Agreement_Key
{
public:
Curve25519_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits,
RandomNumberGenerator& rng);
Curve25519_PrivateKey(RandomNumberGenerator& rng);
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;
private:
secure_vector<byte> m_private;
};
/**
* Curve25519 operation
*/
class BOTAN_DLL Curve25519_KA_Operation : public PK_Ops::Key_Agreement
{
public:
Curve25519_KA_Operation(const Curve25519_PrivateKey& key) : m_key(key) {}
secure_vector<byte> agree(const byte w[], size_t w_len)
{
return m_key.agree(w, w_len);
}
private:
const Curve25519_PrivateKey& m_key;
};
/*
* 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
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