question: public static void cbc_encrypt ( byte [ ] input , byte [ ] output , byte [ ] key , byte [ ] ivec , boolean encrypt ) throws KrbCryptoException { Cipher cipher = null ; try { cipher = Cipher . getInstance ( "DES/CBC/NoPadding" ) ; } catch ( GeneralSecurityException e ) { KrbCryptoException ke = new KrbCryptoException ( "JCE provider may not be installed. " + e . getMessage ( ) ) ; ke . initCause ( e ) ; throw ke ; } IvParameterSpec params = new IvParameterSpec ( ivec ) ; SecretKeySpec skSpec = new SecretKeySpec ( key , "DES" ) ; try { SecretKeyFactory skf = SecretKeyFactory . getInstance ( "DES" ) ; SecretKey sk = ( SecretKey ) skSpec ; if ( encrypt ) cipher . init ( Cipher . ENCRYPT_MODE , sk , params ) ; else cipher . init ( Cipher . DECRYPT_MODE , sk , params ) ; byte [ ] result ; result = cipher . doFinal ( input ) ; System . arraycopy ( result , 0 , output , 0 , result . length ) ; } catch ( GeneralSecurityException e ) { KrbCryptoException ke = new KrbCryptoException ( e . getMessage ( ) ) ; ke . initCause ( e ) ; throw ke ; } }
target:  Creates a DES cipher in Electronic Codebook mode, with no padding.