security - PBEWithSHAAnd128BitRC4 implementation in java -


i using ibm jre , want implement pbewithshaand128bitrc4 algorothm cipher alorithm should use secretkeyfactory , secretkeyspec ,below secret key supporting algos got provider.getinfo() methode ibmjce provider.

cipher algorithms                  : blowfish, aes, des, tripledes, pbewithmd2anddes,                                         pbewithmd2andtripledes, pbewithmd2andrc2,                                         pbewithmd5anddes, pbewithmd5andtripledes,                                         pbewithmd5andrc2, pbewithsha1anddes                                         pbewithsha1andtripledes, pbewithsha1andrc2                                         pbewithshaand40bitrc2, pbewithshaand128bitrc2                                         pbewithshaand40bitrc4, pbewithshaand128bitrc4                                         pbewithshaand2keytripledes, pbewithshaand3keytripledes                                         mars, rc2, rc4, arcfour                                        rsa, seal key agreement algorithm            : diffiehellman key (pair) generator               : blowfish, diffiehellman, dsa, aes, des, tripledes, hmacmd5,                                        hmacsha1, mars, rc2, rc4, rsa, seal, arcfour algorithm parameter generator      : diffiehellman, dsa algorithm parameter                : blowfish, diffiehellman, aes, des, tripledes, dsa, mars,                                        pbewithmd5anddes, rc2 key factory                        : diffiehellman, dsa, rsa secret key factory                 : blowfish, aes, des, tripledes, mars, rc2, rc4, seal, arcfour                                        pkcs5key, pbkdf1 , pbkdf2(pkcs5derived key).

below code giving java.security.invalidkeyexception: missing password exception.

decrypter(string passphrase) throws exception {         secretkeyfactory factory = secretkeyfactory.getinstance("pbkdf2withhmacsha1");         keyspec spec = new pbekeyspec(passphrase.tochararray(), salt, iterationcount, keystrength);         secretkey tmp = factory.generatesecret(spec);         key = new secretkeyspec(tmp.getencoded(), "rc4");         dcipher = cipher.getinstance("pbewithshaand128bitrc4");     }      public string encrypt(string data) throws exception {         dcipher.init(cipher.encrypt_mode, key);         algorithmparameters params = dcipher.getparameters();         system.out.println("getalgorithm : "+params.getalgorithm());         iv = params.getparameterspec(ivparameterspec.class).getiv();         byte[] utf8encrypteddata = dcipher.dofinal(data.getbytes());         string base64encrypteddata = new sun.misc.base64encoder().encodebuffer(utf8encrypteddata);         system.out.println("iv " + new sun.misc.base64encoder().encodebuffer(iv));         system.out.println("encrypted data " + base64encrypteddata);         return base64encrypteddata;     }      public string decrypt(string base64encrypteddata) throws exception {         dcipher.init(cipher.decrypt_mode, key, new ivparameterspec(iv));         byte[] decrypteddata = new sun.misc.base64decoder().decodebuffer(base64encrypteddata);         byte[] utf8 = dcipher.dofinal(decrypteddata);         return new string(utf8, "utf8");     }

one more question ,which secure algorithm amoung default java provider because can not use thrid party bouncycastleprovider ?

thanks .

secure bit of moving target. secure against , how long. if encrypting transaction data has no value hour later, do. if need keep secure long time, want long key pk systems, longer better. pay price on key generation , types of stream encryptions/decryptions.

the number 1 failure of encryption systems not algorithm itself, implementation of system, how keys either generated or stored. said, blowfish , aes both regarded , when implemented should need. can't recommend http://www.schneier.com/ highly enough. applied cryptography bit dated, 10 years or so, cogent explaination of field geared programmers. , blog wealth of information. go there , search if need more details on algorithms. won't ton of in java implementation, can here on so.


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