question: public static byte [ ] decode ( byte [ ] data , String pri_key ) { try { Cipher cipher = Cipher . getInstance ( "RSA/ECB/PKCS1Padding" ) ; java . security . Key k = getPrivateKey ( pri_key ) ; cipher . init ( Cipher . DECRYPT_MODE , k ) ; byte [ ] deBytes = cipher . doFinal ( data ) ; return deBytes ; } catch ( Exception e ) { log . error ( pri_key , e ) ; } return null ; }
target:  decode data with private key.