Decrypt given data previously encoded with cast5-cfb cipher algo. CAST5 in CFB (Cipher Feedback) mode, a stream cipher mode that encrypts small blocks of data. CAST5 is the 128-bit variant of the CAST family, designed for higher security than earlier CAST versions and supporting multiple modes like CFB. CAST5-CFB is secure but has been overshadowed by stronger, more modern encryption algorithms. 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.