Decrypt given data previously encoded with aes-128-cbc-hmac-sha256 cipher algo. AES-128-CBC with HMAC-SHA256 for authentication. Improves security over SHA-1 variant by using SHA-256 for message authentication. Secure as long as SHA-256 remains cryptographically strong. 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.