bouncycastle - BOUNCY CAStLE AES 256 decryption problem in java -


really buggy question , hee code:

import java.io.ioexception; import java.security.*;  import javax.crypto.*; import javax.crypto.spec.*;  public class encryption { public static final int = 0x9f224; public static final int b = 0x98c36; public static final int c = 0x776a2; public static final int d = 0x87667;  private string premaster; ivparameterspec ivspec = new ivparameterspec(new byte[] { 0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x02, 0x03, 0x00, 0x00, 0x00,         0x00, 0x00, 0x00, 0x00, 0x01 }); private byte[] text; private secretkey secret; private byte[] skey; protected secretkey passwordkey; protected pbeparameterspec paramspec; public static final string encyt_algorithm = "aes/cbc/pkcs7padding"; public static final string key_algorithm = "pbewithsha256and256bitaes-cbc-bc" ; //bencyt_algorithmse64encoder encod = new bencyt_algorithmse64encoder(); //bencyt_algorithmse64decoder decod = new bencyt_algorithmse64decoder();  public encryption(string premaster,string text,int x){           this.premaster=premaster;            this.text=encoder.decode(text.tochararray());     try {          keygenerator kg = keygenerator.getinstance("aes");         kg.init(256);         secret = kg.generatekey();     } catch (exception e) {         // todo encyt_algorithmuto-generated catch block         e.printstacktrace();     } }  public encryption(string key,string text){     try {         this.text = encoder.decode(text.tochararray());         this.skey = encoder.decode(key.tochararray());     } catch (exception e) {         e.printstacktrace();     }  }     public string premaster() {      byte[] keys = null;     keys = premaster.getbytes();     int x = -1;     int process = 0;     while (x < keys.length - 2) {         x++;         switch (x) {         case 1:             process = keys[x + 1] | ^ c & (d | keys[x] % a);         case 2:             process += | (keys[x] ^ c) & d;         case 3:             process += keys[x] ^ (keys[x + 1] / a) % d ^ b;         default:             process += keys[x + 1] / (keys[x] ^ c | d);         }     }      byte[] xs = new byte[] { (byte) (process >>> 24),             (byte) (process >> 16 & 0xff), (byte) (process >> 8 & 0xff),             (byte) (process & 0xff) };     premaster = new string(xs);     keygenerators key = new keygenerators(premaster);     string tomaster = key.calculatesecurityhash("md5")             + key.calculatesecurityhash("md2")             + key.calculatesecurityhash("sha-512");       return tomaster; }  public string keywrapper(){     security.addprovider(new org.bouncycastle.jce.provider.bouncycastleprovider());      key sharedkey = secret;     string key = null;     char[] premaster = this.premaster().tochararray();     try {          byte[]salt={ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06};          paramspec = new pbeparameterspec(salt,20);         pbekeyspec keyspec = new pbekeyspec(premaster);         secretkeyfactory factory = secretkeyfactory.getinstance(key_algorithm);         passwordkey = factory.generatesecret(keyspec);         cipher c = cipher.getinstance(key_algorithm);         c.init(cipher.wrap_mode, passwordkey, paramspec);         byte[] wrappedkey = c.wrap(sharedkey);         key=encoder.encode(wrappedkey);     }catch(exception e){         e.printstacktrace();     }     return key; }  public key keyunwrapper(){     security.addprovider(new org.bouncycastle.jce.provider.bouncycastleprovider());      byte[] wrappedkey = skey;     key unwrapped = null;     try{         cipher c = cipher.getinstance(key_algorithm,"bc");         c.init(cipher.unwrap_mode, passwordkey, paramspec);         unwrapped = c.unwrap(wrappedkey, encyt_algorithm, cipher.secret_key);      }catch(exception e){         e.printstacktrace();     }     return unwrapped; } public string encrypt(){     security.addprovider(new org.bouncycastle.jce.provider.bouncycastleprovider());       secretkey key = secret;     string result=null;     try{         cipher cipher = cipher.getinstance(encyt_algorithm);         cipher.init(cipher.encrypt_mode, key);         result =encoder.encode(cipher.dofinal(text));     }catch(exception e){         e.printstacktrace();     }     return result; }    public string decrypt(){     security.addprovider(new org.bouncycastle.jce.provider.bouncycastleprovider());      string result = null;     secretkey key = (secretkey) keyunwrapper();     try{         cipher cipher = cipher.getinstance(encyt_algorithm, "bc");         cipher.init(cipher.decrypt_mode, key);         result =  encoder.encode(cipher.dofinal(text));     }catch(exception e){         e.printstacktrace();     }     return result; }  public static void main(string[] args) throws ioexception{     encryption en = new encryption("123456","hello world",0);     string entext = en.encrypt();     string key = en.keywrapper();     system.out.println(key);     system.out.println(entext);     encryption de = new encryption(key,entext);     string plaintext = de.decrypt();     system.out.println(plaintext); }

and , result ... tried combinations can, none of them works ..

f63de3ee8ceecf4df76836ca6d69a3903bd87b5726656c54c1c8ec30b6653b2c0e5c7672be3cf4be7b2dc7ac5d07dea0 f1c8d92e5f74019c569d54d70045add6 java.lang.nullpointerexception @ org.bouncycastle.jce.provider.jceblockcipher.engineinit(unknown source) @ javax.crypto.cipher.init(dashoa13*..) @ javax.crypto.cipher.init(dashoa13*..) @ fiador.authentication.util.encryption.keyunwrapper(encryption.java:114) @ fiador.authentication.util.encryption.decrypt(encryption.java:142) @ fiador.authentication.util.encryption.main(encryption.java:160)  java.lang.nullpointerexception @ org.bouncycastle.jce.provider.jceblockcipher.engineinit(unknown source) @ javax.crypto.cipher.a(dashoa13*..) @ javax.crypto.cipher.a(dashoa13*..) @ javax.crypto.cipher.init(dashoa13*..) @ javax.crypto.cipher.init(dashoa13*..) @ fiador.authentication.util.encryption.decrypt(encryption.java:145) @ fiador.authentication.util.encryption.main(encryption.java:160)

null

the first nullpointerexception occurs inside method call (in keyunwrapper method):

c.init(cipher.unwrap_mode, passwordkey, paramspec);

have look: 1 of these arguments null?

looking @ code, seems passwordkey assigned in keywrapper, not called on instance of class.


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