/************************************************* * EMSA/EME/KDF/MGF Retrieval Source File * * (C) 1999-2007 Jack Lloyd * *************************************************/ #include #include #include #include #include #include #include namespace Botan { /************************************************* * Get an EMSA by name * *************************************************/ EMSA* get_emsa(const std::string& algo_spec) { std::vector name = parse_algorithm_name(algo_spec); const std::string emsa_name = deref_alias(name[0]); if(emsa_name == "Raw") { if(name.size() == 1) return new EMSA_Raw; } else if(emsa_name == "EMSA1") { if(name.size() == 2) return new EMSA1(name[1]); } else if(emsa_name == "EMSA2") { if(name.size() == 2) return new EMSA2(name[1]); } else if(emsa_name == "EMSA3") { if(name.size() == 2) return new EMSA3(name[1]); } else if(emsa_name == "EMSA4") { if(name.size() == 2) return new EMSA4(name[1], "MGF1"); if(name.size() == 3) return new EMSA4(name[1], name[2]); if(name.size() == 4) return new EMSA4(name[1], name[2], to_u32bit(name[3])); } else throw Algorithm_Not_Found(algo_spec); throw Invalid_Algorithm_Name(algo_spec); } /************************************************* * Get an EME by name * *************************************************/ EME* get_eme(const std::string& algo_spec) { std::vector name = parse_algorithm_name(algo_spec); const std::string eme_name = deref_alias(name[0]); if(eme_name == "PKCS1v15") { if(name.size() == 1) return new EME_PKCS1v15; } else if(eme_name == "EME1") { if(name.size() == 2) return new EME1(name[1], "MGF1"); if(name.size() == 3) return new EME1(name[1], name[2]); } else throw Algorithm_Not_Found(algo_spec); throw Invalid_Algorithm_Name(algo_spec); } /************************************************* * Get an KDF by name * *************************************************/ KDF* get_kdf(const std::string& algo_spec) { std::vector name = parse_algorithm_name(algo_spec); const std::string kdf_name = deref_alias(name[0]); if(kdf_name == "KDF1") { if(name.size() == 2) return new KDF1(name[1]); } else if(kdf_name == "KDF2") { if(name.size() == 2) return new KDF2(name[1]); } else if(kdf_name == "X9.42-PRF") { if(name.size() == 2) return new X942_PRF(name[1]); } else throw Algorithm_Not_Found(algo_spec); throw Invalid_Algorithm_Name(algo_spec); } /************************************************* * Get a MGF by name * *************************************************/ MGF* get_mgf(const std::string& algo_spec) { std::vector name = parse_algorithm_name(algo_spec); const std::string mgf_name = deref_alias(name[0]); if(mgf_name == "MGF1") { if(name.size() == 2) return new MGF1(name[1]); } else throw Algorithm_Not_Found(algo_spec); throw Invalid_Algorithm_Name(algo_spec); } }