Interim update to allow stream ciphers where no initialization vector is allowed (e.g., "RC4"). Cipher.getBlockSize equal to 0 is used to detect this case, hence this implementation likely still does not support block cipher modes that do not accept initialization vectors (e.g., ECB).

One additional remaining inadequacy is the case where the initialization vector is not the same length as the encryption key (e.g., ""Blowfish/CFB/NoPadding" allows a key length up to 448 bits, but the initialization vector is always 64 bits).