Illegalargumentexception Chacha20 Requires 128 Bit Or 256 Bit Key

How could I convert String to 128 or 256 bit key for chacha20 Encryption . ChaCha20Encryptor chaCha20Encryptor = new ChaCha20Encryptor(); byte[] data = chaCha20Encryptor.

Solution 1:

Your key, without the dashes, is a perfectly valid 128 bits hexadecimal key. It is 32 characters, which is 16 bytes => 128 bits.

All you have to do is :

1. remove the dashes key2.replace("-","");
2. Convert the hexadecimal String to its byte[] representation. I personally use javax.xml.bind.DatatypeConverter available for java 1.7 and above. Use it like this : DatatypeConverter.parseHexBinary(hexString);

Your complete call should look like this :

chaCha20Encryptor.encrypt(
             plaintext.getBytes(),
             DatatypeConverter.parseHexBinary(key2.replace("-","")));