diff options
Diffstat (limited to 'utils/aes_decrypt_block.cpp')
| -rw-r--r-- | utils/aes_decrypt_block.cpp | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/utils/aes_decrypt_block.cpp b/utils/aes_decrypt_block.cpp new file mode 100644 index 0000000..778aecb --- /dev/null +++ b/utils/aes_decrypt_block.cpp @@ -0,0 +1,234 @@ +/** + * \file + * \author Egor Tensin <Egor.Tensin@gmail.com> + * \date 2015 + * \copyright This file is licensed under the terms of the MIT License. + * See LICENSE.txt for details. + */ + +#include "aes_block_common.hpp" + +#include <aesni/all.h> + +#include <aesnixx/all.hpp> + +#include <deque> +#include <exception> +#include <iostream> +#include <string> + +namespace +{ + template <aesni::Algorithm algorithm, aesni::Mode mode> + bool decrypt_with_mode( + const std::string& key_str, + std::deque<std::string>& ciphertexts) + { + typename aesni::aes::Types<algorithm>::BlockT iv; + + if (aesni::ModeRequiresInitializationVector<mode>()) + { + if (ciphertexts.empty()) + return false; + + aesni::aes::from_string(iv, ciphertexts.front()); + ciphertexts.pop_front(); + } + + typename aesni::aes::Types<algorithm>::KeyT key; + aesni::aes::from_string(key, key_str); + + aesni::aes::Encrypt<algorithm, mode> encrypt(key, iv); + + while (!ciphertexts.empty()) + { + typename aesni::aes::Types<algorithm>::BlockT ciphertext; + aesni::aes::from_string(ciphertext, ciphertexts.front()); + ciphertexts.pop_front(); + + std::cout << aesni::aes::to_string(encrypt.decrypt(ciphertext)) << "\n"; + } + + return true; + } + + template <aesni::Algorithm algorithm> + bool decrypt_with_algorithm( + aesni::Mode mode, + const std::string& key_str, + std::deque<std::string>& ciphertexts) + { + switch (mode) + { + case AESNI_ECB: + return decrypt_with_mode<algorithm, AESNI_ECB>(key_str, ciphertexts); + + case AESNI_CBC: + return decrypt_with_mode<algorithm, AESNI_CBC>(key_str, ciphertexts); + + case AESNI_CFB: + return decrypt_with_mode<algorithm, AESNI_CFB>(key_str, ciphertexts); + + case AESNI_OFB: + return decrypt_with_mode<algorithm, AESNI_OFB>(key_str, ciphertexts); + + case AESNI_CTR: + return decrypt_with_mode<algorithm, AESNI_CTR>(key_str, ciphertexts); + + default: + return false; + } + } + + bool decrypt( + aesni::Algorithm algorithm, + aesni::Mode mode, + const std::string& key_str, + std::deque<std::string> ciphertexts) + { + switch (algorithm) + { + case AESNI_AES128: + return decrypt_with_algorithm<AESNI_AES128>(mode, key_str, ciphertexts); + + case AESNI_AES192: + return decrypt_with_algorithm<AESNI_AES192>(mode, key_str, ciphertexts); + + case AESNI_AES256: + return decrypt_with_algorithm<AESNI_AES256>(mode, key_str, ciphertexts); + + default: + return false; + } + } + + bool decrypt_using_boxes( + aesni::Algorithm algorithm, + aesni::Mode mode, + const std::string& key, + std::deque<std::string> ciphertexts) + { + AesNI_BoxAlgorithmParams algorithm_params; + + switch (algorithm) + { + case AESNI_AES128: + aesni::aes::from_string(algorithm_params.aes128_key, key); + break; + + case AESNI_AES192: + aesni::aes::from_string(algorithm_params.aes192_key, key); + break; + + case AESNI_AES256: + aesni::aes::from_string(algorithm_params.aes256_key, key); + break; + + default: + return false; + } + + AesNI_BoxBlock iv; + AesNI_BoxBlock* iv_ptr = nullptr; + + if (aesni::mode_requires_initialization_vector(mode)) + { + if (ciphertexts.empty()) + return false; + + aesni::aes::from_string(iv.aes_block, ciphertexts.front()); + iv_ptr = &iv; + ciphertexts.pop_front(); + } + + AesNI_Box box; + aesni_box_init( + &box, + algorithm, + &algorithm_params, + mode, + iv_ptr, + aesni::ErrorDetailsThrowsInDestructor()); + + while (!ciphertexts.empty()) + { + AesNI_BoxBlock ciphertext; + aesni::aes::from_string(ciphertext.aes_block, ciphertexts.front()); + ciphertexts.pop_front(); + + AesNI_BoxBlock plaintext; + aesni_box_decrypt_block( + &box, + &ciphertext, + &plaintext, + aesni::ErrorDetailsThrowsInDestructor()); + + std::cout << aesni::aes::to_string(plaintext.aes_block) << "\n"; + } + + return true; + } +} + +int main(int argc, char** argv) +{ + try + { + CommandLineParser cmd_parser("aes_decrypt_block.exe"); + + if (!cmd_parser.parse_options(argc, argv)) + return 0; + + const auto algorithm = cmd_parser.get_algorithm(); + const auto mode = cmd_parser.get_mode(); + + auto args = cmd_parser.get_args(); + + while (!args.empty()) + { + const auto key = args.front(); + args.pop_front(); + + std::deque<std::string> ciphertexts; + + while (!args.empty()) + { + if (args.front() == "--") + { + args.pop_front(); + break; + } + + ciphertexts.push_back(args.front()); + args.pop_front(); + } + + const auto success = cmd_parser.use_boxes() + ? decrypt_using_boxes(algorithm, mode, key, ciphertexts) + : decrypt(algorithm, mode, key, ciphertexts); + + if (!success) + { + cmd_parser.print_usage(); + return 1; + } + } + + return 0; + } + catch (const boost::program_options::error& e) + { + std::cerr << "Usage error: " << e.what() << "\n"; + return 1; + } + catch (const aesni::Error& e) + { + std::cerr << e; + return 1; + } + catch (const std::exception& e) + { + std::cerr << e.what() << "\n"; + return 1; + } +} |