diff options
Diffstat (limited to 'src/lib/modes/cipher_mode.cpp')
-rw-r--r-- | src/lib/modes/cipher_mode.cpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/lib/modes/cipher_mode.cpp b/src/lib/modes/cipher_mode.cpp new file mode 100644 index 000000000..ded7b4c81 --- /dev/null +++ b/src/lib/modes/cipher_mode.cpp @@ -0,0 +1,59 @@ +/* +* Cipher Modes +* (C) 2015 Jack Lloyd +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#include <botan/cipher_mode.h> +#include <sstream> + +namespace Botan { + +Cipher_Mode* get_cipher_mode(const std::string& algo_spec, Cipher_Dir direction) + { + const char* dir_string = (direction == ENCRYPTION) ? "_Encryption" : "_Decryption"; + + const std::string provider = ""; + + std::unique_ptr<Transform> t; + + t.reset(get_transform(algo_spec, provider, dir_string)); + + if(Cipher_Mode* cipher = dynamic_cast<Cipher_Mode*>(t.get())) + { + t.release(); + return cipher; + } + + const std::vector<std::string> algo_parts = split_on(algo_spec, '/'); + if(algo_parts.size() < 2) + return nullptr; + + const std::string cipher_name = algo_parts[0]; + const std::vector<std::string> mode_info = parse_algorithm_name(algo_parts[1]); + + if(mode_info.empty()) + return nullptr; + + std::ostringstream t_name; + + t_name << mode_info[0] << dir_string << '(' << cipher_name; + for(size_t i = 1; i < mode_info.size(); ++i) + t_name << ',' << mode_info[i]; + for(size_t i = 2; i < algo_parts.size(); ++i) + t_name << ',' << algo_parts[i]; + t_name << ')'; + + t.reset(get_transform(t_name.str(), provider)); + + if(Cipher_Mode* cipher = dynamic_cast<Cipher_Mode*>(t.get())) + { + t.release(); + return cipher; + } + + return nullptr; + } + +} |