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/*
* RSA
* (C) 1999-2008,2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_RSA_H__
#define BOTAN_RSA_H__
#include <botan/bigint.h>
#include <botan/x509_key.h>
namespace Botan {
/**
* RSA Public Key
*/
class BOTAN_DLL RSA_PublicKey : public virtual Public_Key
{
public:
/**
* Load a public key.
* @param alg_id the X.509 algorithm identifier
* @param key_bits X.509 subject public key info structure
*/
RSA_PublicKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits);
/**
* Create a public key.
* @arg n the modulus
* @arg e the exponent
*/
RSA_PublicKey(const BigInt& n, const BigInt& e) :
m_n(n), m_e(e) {}
std::string algo_name() const override { return "RSA"; }
bool check_key(RandomNumberGenerator& rng, bool) const override;
AlgorithmIdentifier algorithm_identifier() const override;
std::vector<byte> x509_subject_public_key() const override;
/**
* @return public modulus
*/
const BigInt& get_n() const { return m_n; }
/**
* @return public exponent
*/
const BigInt& get_e() const { return m_e; }
size_t max_input_bits() const override { return (m_n.bits() - 1); }
size_t estimated_strength() const override;
std::unique_ptr<PK_Ops::Encryption>
create_encryption_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
std::unique_ptr<PK_Ops::KEM_Encryption>
create_kem_encryption_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
std::unique_ptr<PK_Ops::Verification>
create_verification_op(const std::string& params,
const std::string& provider) const override;
protected:
RSA_PublicKey() {}
BigInt m_n, m_e;
};
/**
* RSA Private Key
*/
class BOTAN_DLL RSA_PrivateKey : public Private_Key, public RSA_PublicKey
{
public:
/**
* Load a private key.
* @param alg_id the X.509 algorithm identifier
* @param key_bits PKCS #8 structure
* @param rng a random number generator
*/
RSA_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits,
RandomNumberGenerator& rng);
/**
* Construct a private key from the specified parameters.
* @param rng a random number generator
* @param p the first prime
* @param q the second prime
* @param e the exponent
* @param d if specified, this has to be d with
* exp * d = 1 mod (p - 1, q - 1). Leave it as 0 if you wish to
* the constructor to calculate it.
* @param n if specified, this must be n = p * q. Leave it as 0
* if you wish to the constructor to calculate it.
*/
RSA_PrivateKey(RandomNumberGenerator& rng,
const BigInt& p, const BigInt& q,
const BigInt& e, const BigInt& d = 0,
const BigInt& n = 0);
/**
* Create a new private key with the specified bit length
* @param rng the random number generator to use
* @param bits the desired bit length of the private key
* @param exp the public exponent to be used
*/
RSA_PrivateKey(RandomNumberGenerator& rng,
size_t bits, size_t exp = 65537);
bool check_key(RandomNumberGenerator& rng, bool) const override;
/**
* Get the first prime p.
* @return prime p
*/
const BigInt& get_p() const { return m_p; }
/**
* Get the second prime q.
* @return prime q
*/
const BigInt& get_q() const { return m_q; }
/**
* Get d with exp * d = 1 mod (p - 1, q - 1).
* @return d
*/
const BigInt& get_d() const { return m_d; }
const BigInt& get_c() const { return m_c; }
const BigInt& get_d1() const { return m_d1; }
const BigInt& get_d2() const { return m_d2; }
secure_vector<byte> pkcs8_private_key() const override;
std::unique_ptr<PK_Ops::Decryption>
create_decryption_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
std::unique_ptr<PK_Ops::KEM_Decryption>
create_kem_decryption_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
std::unique_ptr<PK_Ops::Signature>
create_signature_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
private:
BigInt m_d, m_p, m_q, m_d1, m_d2, m_c;
};
}
#endif
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