/* * OpenSSL Block Cipher * (C) 1999-2010 Jack Lloyd * * Distributed under the terms of the Botan license */ #include #include namespace Botan { namespace { /* * EVP Block Cipher */ class EVP_BlockCipher : public BlockCipher { public: void clear(); std::string name() const { return cipher_name; } BlockCipher* clone() const; size_t block_size() const { return block_sz; } EVP_BlockCipher(const EVP_CIPHER*, const std::string&); EVP_BlockCipher(const EVP_CIPHER*, const std::string&, size_t, size_t, size_t); Key_Length_Specification key_spec() const { return cipher_key_spec; } ~EVP_BlockCipher(); private: void encrypt_n(const byte in[], byte out[], size_t blocks) const; void decrypt_n(const byte in[], byte out[], size_t blocks) const; void key_schedule(const byte[], size_t); size_t block_sz; Key_Length_Specification cipher_key_spec; std::string cipher_name; mutable EVP_CIPHER_CTX encrypt, decrypt; }; /* * EVP Block Cipher Constructor */ EVP_BlockCipher::EVP_BlockCipher(const EVP_CIPHER* algo, const std::string& algo_name) : block_sz(EVP_CIPHER_block_size(algo)), cipher_key_spec(EVP_CIPHER_key_length(algo)), cipher_name(algo_name) { if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE) throw Invalid_Argument("EVP_BlockCipher: Non-ECB EVP was passed in"); EVP_CIPHER_CTX_init(&encrypt); EVP_CIPHER_CTX_init(&decrypt); EVP_EncryptInit_ex(&encrypt, algo, 0, 0, 0); EVP_DecryptInit_ex(&decrypt, algo, 0, 0, 0); EVP_CIPHER_CTX_set_padding(&encrypt, 0); EVP_CIPHER_CTX_set_padding(&decrypt, 0); } /* * EVP Block Cipher Constructor */ EVP_BlockCipher::EVP_BlockCipher(const EVP_CIPHER* algo, const std::string& algo_name, size_t key_min, size_t key_max, size_t key_mod) : block_sz(EVP_CIPHER_block_size(algo)), cipher_key_spec(key_min, key_max, key_mod), cipher_name(algo_name) { if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE) throw Invalid_Argument("EVP_BlockCipher: Non-ECB EVP was passed in"); EVP_CIPHER_CTX_init(&encrypt); EVP_CIPHER_CTX_init(&decrypt); EVP_EncryptInit_ex(&encrypt, algo, 0, 0, 0); EVP_DecryptInit_ex(&decrypt, algo, 0, 0, 0); EVP_CIPHER_CTX_set_padding(&encrypt, 0); EVP_CIPHER_CTX_set_padding(&decrypt, 0); } /* * EVP Block Cipher Destructor */ EVP_BlockCipher::~EVP_BlockCipher() { EVP_CIPHER_CTX_cleanup(&encrypt); EVP_CIPHER_CTX_cleanup(&decrypt); } /* * Encrypt a block */ void EVP_BlockCipher::encrypt_n(const byte in[], byte out[], size_t blocks) const { int out_len = 0; EVP_EncryptUpdate(&encrypt, out, &out_len, in, blocks * block_sz); } /* * Decrypt a block */ void EVP_BlockCipher::decrypt_n(const byte in[], byte out[], size_t blocks) const { int out_len = 0; EVP_DecryptUpdate(&decrypt, out, &out_len, in, blocks * block_sz); } /* * Set the key */ void EVP_BlockCipher::key_schedule(const byte key[], size_t length) { SecureVector full_key(key, length); if(cipher_name == "TripleDES" && length == 16) { full_key += std::make_pair(key, 8); } else if(EVP_CIPHER_CTX_set_key_length(&encrypt, length) == 0 || EVP_CIPHER_CTX_set_key_length(&decrypt, length) == 0) throw Invalid_Argument("EVP_BlockCipher: Bad key length for " + cipher_name); if(cipher_name == "RC2") { EVP_CIPHER_CTX_ctrl(&encrypt, EVP_CTRL_SET_RC2_KEY_BITS, length*8, 0); EVP_CIPHER_CTX_ctrl(&decrypt, EVP_CTRL_SET_RC2_KEY_BITS, length*8, 0); } EVP_EncryptInit_ex(&encrypt, 0, 0, full_key.begin(), 0); EVP_DecryptInit_ex(&decrypt, 0, 0, full_key.begin(), 0); } /* * Return a clone of this object */ BlockCipher* EVP_BlockCipher::clone() const { return new EVP_BlockCipher(EVP_CIPHER_CTX_cipher(&encrypt), cipher_name, cipher_key_spec.minimum_keylength(), cipher_key_spec.maximum_keylength(), cipher_key_spec.keylength_multiple()); } /* * Clear memory of sensitive data */ void EVP_BlockCipher::clear() { const EVP_CIPHER* algo = EVP_CIPHER_CTX_cipher(&encrypt); EVP_CIPHER_CTX_cleanup(&encrypt); EVP_CIPHER_CTX_cleanup(&decrypt); EVP_CIPHER_CTX_init(&encrypt); EVP_CIPHER_CTX_init(&decrypt); EVP_EncryptInit_ex(&encrypt, algo, 0, 0, 0); EVP_DecryptInit_ex(&decrypt, algo, 0, 0, 0); EVP_CIPHER_CTX_set_padding(&encrypt, 0); EVP_CIPHER_CTX_set_padding(&decrypt, 0); } } /* * Look for an algorithm with this name */ BlockCipher* OpenSSL_Engine::find_block_cipher(const SCAN_Name& request, Algorithm_Factory&) const { #define HANDLE_EVP_CIPHER(NAME, EVP) \ if(request.algo_name() == NAME && request.arg_count() == 0) \ return new EVP_BlockCipher(EVP, NAME); #define HANDLE_EVP_CIPHER_KEYLEN(NAME, EVP, MIN, MAX, MOD) \ if(request.algo_name() == NAME && request.arg_count() == 0) \ return new EVP_BlockCipher(EVP, NAME, MIN, MAX, MOD); #if !defined(OPENSSL_NO_AES) /* Using OpenSSL's AES causes crashes inside EVP on x86-64 with OpenSSL 0.9.8g cause is unknown */ HANDLE_EVP_CIPHER("AES-128", EVP_aes_128_ecb()); HANDLE_EVP_CIPHER("AES-192", EVP_aes_192_ecb()); HANDLE_EVP_CIPHER("AES-256", EVP_aes_256_ecb()); #endif #if !defined(OPENSSL_NO_DES) HANDLE_EVP_CIPHER("DES", EVP_des_ecb()); HANDLE_EVP_CIPHER_KEYLEN("TripleDES", EVP_des_ede3_ecb(), 16, 24, 8); #endif #if !defined(OPENSSL_NO_BF) HANDLE_EVP_CIPHER_KEYLEN("Blowfish", EVP_bf_ecb(), 1, 56, 1); #endif #if !defined(OPENSSL_NO_CAST) HANDLE_EVP_CIPHER_KEYLEN("CAST-128", EVP_cast5_ecb(), 1, 16, 1); #endif #if !defined(OPENSSL_NO_CAMELLIA) HANDLE_EVP_CIPHER("Camellia-128", EVP_camellia_128_ecb()); HANDLE_EVP_CIPHER("Camellia-192", EVP_camellia_192_ecb()); HANDLE_EVP_CIPHER("Camellia-256", EVP_camellia_256_ecb()); #endif #if !defined(OPENSSL_NO_RC2) HANDLE_EVP_CIPHER_KEYLEN("RC2", EVP_rc2_ecb(), 1, 32, 1); #endif #if !defined(OPENSSL_NO_RC5) && 0 if(request.algo_name() == "RC5") if(request.arg_as_integer(0, 12) == 12) return new EVP_BlockCipher(EVP_rc5_32_12_16_ecb(), "RC5(12)", 1, 32, 1); #endif #if !defined(OPENSSL_NO_IDEA) && 0 HANDLE_EVP_CIPHER("IDEA", EVP_idea_ecb()); #endif #if !defined(OPENSSL_NO_SEED) HANDLE_EVP_CIPHER("SEED", EVP_seed_ecb()); #endif #undef HANDLE_EVP_CIPHER #undef HANDLE_EVP_CIPHER_KEYLEN return 0; } }