Botan
1.11.15
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00001 /* 00002 * ElGamal 00003 * (C) 1999-2007 Jack Lloyd 00004 * 00005 * Botan is released under the Simplified BSD License (see license.txt) 00006 */ 00007 00008 #ifndef BOTAN_ELGAMAL_H__ 00009 #define BOTAN_ELGAMAL_H__ 00010 00011 #include <botan/dl_algo.h> 00012 00013 namespace Botan { 00014 00015 /** 00016 * ElGamal Public Key 00017 */ 00018 class BOTAN_DLL ElGamal_PublicKey : public virtual DL_Scheme_PublicKey 00019 { 00020 public: 00021 std::string algo_name() const { return "ElGamal"; } 00022 DL_Group::Format group_format() const { return DL_Group::ANSI_X9_42; } 00023 00024 size_t max_input_bits() const { return (group_p().bits() - 1); } 00025 00026 ElGamal_PublicKey(const AlgorithmIdentifier& alg_id, 00027 const secure_vector<byte>& key_bits) : 00028 DL_Scheme_PublicKey(alg_id, key_bits, DL_Group::ANSI_X9_42) 00029 {} 00030 00031 ElGamal_PublicKey(const DL_Group& group, const BigInt& y); 00032 protected: 00033 ElGamal_PublicKey() {} 00034 }; 00035 00036 /** 00037 * ElGamal Private Key 00038 */ 00039 class BOTAN_DLL ElGamal_PrivateKey : public ElGamal_PublicKey, 00040 public virtual DL_Scheme_PrivateKey 00041 { 00042 public: 00043 bool check_key(RandomNumberGenerator& rng, bool) const; 00044 00045 ElGamal_PrivateKey(const AlgorithmIdentifier& alg_id, 00046 const secure_vector<byte>& key_bits, 00047 RandomNumberGenerator& rng); 00048 00049 ElGamal_PrivateKey(RandomNumberGenerator& rng, 00050 const DL_Group& group, 00051 const BigInt& priv_key = 0); 00052 }; 00053 00054 } 00055 00056 #endif