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/*
* Rabin-Williams
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_RW_H__
#define BOTAN_RW_H__
#include <botan/if_algo.h>
#include <botan/pk_ops.h>
#include <botan/reducer.h>
#include <botan/blinding.h>
namespace Botan {
/**
* Rabin-Williams Public Key
*/
class BOTAN_DLL RW_PublicKey : public virtual IF_Scheme_PublicKey
{
public:
std::string algo_name() const { return "RW"; }
RW_PublicKey(const AlgorithmIdentifier& alg_id,
const MemoryRegion<byte>& key_bits) :
IF_Scheme_PublicKey(alg_id, key_bits)
{}
RW_PublicKey(const BigInt& mod, const BigInt& exponent) :
IF_Scheme_PublicKey(mod, exponent)
{}
protected:
RW_PublicKey() {}
};
/**
* Rabin-Williams Private Key
*/
class BOTAN_DLL RW_PrivateKey : public RW_PublicKey,
public IF_Scheme_PrivateKey
{
public:
RW_PrivateKey(const AlgorithmIdentifier& alg_id,
const MemoryRegion<byte>& key_bits,
RandomNumberGenerator& rng) :
IF_Scheme_PrivateKey(rng, alg_id, key_bits) {}
RW_PrivateKey(RandomNumberGenerator& rng,
const BigInt& p, const BigInt& q,
const BigInt& e, const BigInt& d = 0,
const BigInt& n = 0) :
IF_Scheme_PrivateKey(rng, p, q, e, d, n) {}
RW_PrivateKey(RandomNumberGenerator& rng, size_t bits, size_t = 2);
bool check_key(RandomNumberGenerator& rng, bool) const;
};
/**
* Rabin-Williams Signature Operation
*/
class BOTAN_DLL RW_Signature_Operation : public PK_Ops::Signature
{
public:
RW_Signature_Operation(const RW_PrivateKey& rw);
size_t max_input_bits() const { return (n.bits() - 1); }
SecureVector<byte> sign(const byte msg[], size_t msg_len,
RandomNumberGenerator& rng);
private:
const BigInt& n;
const BigInt& e;
const BigInt& q;
const BigInt& c;
Fixed_Exponent_Power_Mod powermod_d1_p, powermod_d2_q;
Modular_Reducer mod_p;
Blinder blinder;
};
/**
* Rabin-Williams Verification Operation
*/
class BOTAN_DLL RW_Verification_Operation : public PK_Ops::Verification
{
public:
RW_Verification_Operation(const RW_PublicKey& rw) :
n(rw.get_n()), powermod_e_n(rw.get_e(), rw.get_n())
{}
size_t max_input_bits() const { return (n.bits() - 1); }
bool with_recovery() const { return true; }
SecureVector<byte> verify_mr(const byte msg[], size_t msg_len);
private:
const BigInt& n;
Fixed_Exponent_Power_Mod powermod_e_n;
};
}
#endif
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