/* * DL Scheme * (C) 1999-2007 Jack Lloyd * * Distributed under the terms of the Botan license */ #include #include #include #include #include namespace Botan { size_t DL_Scheme_PublicKey::estimated_strength() const { return dl_work_factor(group.get_p().bits()); } AlgorithmIdentifier DL_Scheme_PublicKey::algorithm_identifier() const { return AlgorithmIdentifier(get_oid(), group.DER_encode(group_format())); } std::vector DL_Scheme_PublicKey::x509_subject_public_key() const { return DER_Encoder().encode(y).get_contents_unlocked(); } DL_Scheme_PublicKey::DL_Scheme_PublicKey(const AlgorithmIdentifier& alg_id, const secure_vector& key_bits, DL_Group::Format format) { group.BER_decode(alg_id.parameters, format); BER_Decoder(key_bits).decode(y); } secure_vector DL_Scheme_PrivateKey::pkcs8_private_key() const { return DER_Encoder().encode(x).get_contents(); } DL_Scheme_PrivateKey::DL_Scheme_PrivateKey(const AlgorithmIdentifier& alg_id, const secure_vector& key_bits, DL_Group::Format format) { group.BER_decode(alg_id.parameters, format); BER_Decoder(key_bits).decode(x); } /* * Check Public DL Parameters */ bool DL_Scheme_PublicKey::check_key(RandomNumberGenerator& rng, bool strong) const { if(y < 2 || y >= group_p()) return false; if(!group.verify_group(rng, strong)) return false; return true; } /* * Check DL Scheme Private Parameters */ bool DL_Scheme_PrivateKey::check_key(RandomNumberGenerator& rng, bool strong) const { const BigInt& p = group_p(); const BigInt& g = group_g(); if(y < 2 || y >= p || x < 2 || x >= p) return false; if(!group.verify_group(rng, strong)) return false; if(!strong) return true; if(y != power_mod(g, x, p)) return false; return true; } }