TripleDES encryption / decryption

3DES (Triple Des) encryption decryption tool. Supports 3DES double and triple keys. The key length is 128/192 bits, respectively. Double key can be replaced with triple key, double key's first 64-bit plus after 64-bit plus the first 64-bit equal to the replacement triple key. When the key length is insufficient, it will be filled with 0x00. IV is the same, filling in this way. The out-of-the-place will be ignored. If there is no specific indication that the platform will use UTF8 encoding to process data (e.g. KEY/IV). This tool is not fully tested, please give feedback if a problem is found.