question: public byte [ ] encryptRaw ( byte [ ] baseKey , int usage , byte [ ] ivec , byte [ ] plaintext , int start , int len ) throws GeneralSecurityException , KrbCryptoException { if ( ! KeyUsage . isValid ( usage ) ) { throw new GeneralSecurityException ( "Invalid key usage number: " + usage ) ; } byte [ ] output = encryptCTS ( baseKey , usage , ivec , null , plaintext , start , len , false ) ; return output ; }
target:  Performs encryption using derived key; does not add confounder.