Decrypt given data previously encoded with cast5-ofb cipher algo. CAST5 in OFB (Output Feedback) mode, which converts the block cipher into a stream cipher using a feedback loop. CAST5, like other CAST variants, was designed in the 1990s and supports OFB mode for better performance than ECB. CAST5-OFB is secure, though it is less commonly used than more popular stream ciphers like ChaCha20. Our decryption process assumes the IV string is prepended in the encoded string during the encryption process. You can not decrypt and get the correct results if the IV or passphrase mismatch occurs between encryption and decryption process.