Example usage for javax.crypto Cipher DECRYPT

Introduction

In this page you can find the example usage for javax.crypto Cipher DECRYPT_MODE.

Prototype

int DECRYPT_MODE

To view the source code for javax.crypto Cipher DECRYPT_MODE.

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Document

Constant used to initialize cipher to decryption mode.

Usage

From source file:corner.services.impl.DESedeEncryptServiceImpl.java

public byte[] decrypt(byte[] src, byte[] keybyte) {
    try {/*from   w  w w . j  a v  a  2s  .co m*/
        SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
        Cipher c1 = Cipher.getInstance(Algorithm);
        c1.init(Cipher.DECRYPT_MODE, deskey);
        return c1.doFinal(src);
    } catch (java.security.NoSuchAlgorithmException e1) {
        e1.printStackTrace();
    } catch (javax.crypto.NoSuchPaddingException e2) {
        e2.printStackTrace();
    } catch (java.lang.Exception e3) {
        e3.printStackTrace();
    }
    return null;
}

From source file:net.mindengine.oculus.frontend.web.Auth.java

public static User decodeUser(String encodedString) {
    try {/*w  ww  .  jav a  2 s. com*/
        ObjectInputStream ois = new ObjectInputStream(
                new ByteArrayInputStream(Base64.decodeBase64(encodedString.getBytes())));
        SealedObject sealedObject = (SealedObject) ois.readObject();
        ois.close();

        Cipher dcipher = Cipher.getInstance("DES");
        dcipher.init(Cipher.DECRYPT_MODE, secrectAuthKey);

        User user = (User) sealedObject.getObject(dcipher);
        return user;
    } catch (Exception e) {
        return null;
    }
}

From source file:CipherSocket.java

public InputStream getInputStream() throws IOException {
    InputStream is = delegate == null ? super.getInputStream() : delegate.getInputStream();
    Cipher cipher = null;//from  w  ww. j  a va  2 s.c o  m
    try {
        cipher = Cipher.getInstance(algorithm);
        int size = cipher.getBlockSize();
        byte[] tmp = new byte[size];
        Arrays.fill(tmp, (byte) 15);
        IvParameterSpec iv = new IvParameterSpec(tmp);
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
    } catch (Exception e) {
        e.printStackTrace();
        throw new IOException("Failed to init cipher: " + e.getMessage());
    }
    CipherInputStream cis = new CipherInputStream(is, cipher);
    return cis;
}

From source file:com.dasol.util.AES256Util.java

public String aesDecode(String str) throws java.io.UnsupportedEncodingException, NoSuchAlgorithmException,
        NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException,
        IllegalBlockSizeException, BadPaddingException {
    Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
    c.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv.getBytes("UTF-8")));

    byte[] byteStr = Base64.decodeBase64(str.getBytes());

    return new String(c.doFinal(byteStr), "UTF-8");
}

From source file:com.zotoh.core.crypto.JavaOfuscator.java

private String decrypt(String encoded) throws Exception {
    if (isEmpty(encoded)) {
        return encoded;
    }//from   w  ww. ja  v a  2s.  c o  m
    Cipher c = getCipher(Cipher.DECRYPT_MODE);
    ByteOStream baos = new ByteOStream();
    byte[] p = Base64.decodeBase64(encoded);
    byte[] out = new byte[Math.max(4096, c.getOutputSize(p.length))];
    int n = c.update(p, 0, p.length, out, 0);
    if (n > 0) {
        baos.write(out, 0, n);
    }
    n = c.doFinal(out, 0);
    if (n > 0) {
        baos.write(out, 0, n);
    }

    return asString(baos.asBytes());
}

From source file:cn.org.once.cstack.utils.CustomPasswordEncoder.java

public String decode(CharSequence pass) {
    Cipher cipher;// www  .  j a va2s  .co m
    String decryptString = null;
    try {
        byte[] encryptText = Base64.decodeBase64(pass.toString());
        cipher = Cipher.getInstance(ALGO);
        cipher.init(Cipher.DECRYPT_MODE, generateKey());
        decryptString = new String(cipher.doFinal(encryptText));
    } catch (Exception e) {
        e.printStackTrace();
    }
    return decryptString;
}

From source file:com.glaf.core.security.SecurityUtils.java

/**
 * DES/* w  ww.j a v  a2  s  .c  om*/
 * 
 * @param data
 *            
 * @param key
 *            ???8?
 * @return ?
 */
public static String decode(String key, String data) {
    if (data == null) {
        return null;
    }
    try {
        DESKeySpec dks = new DESKeySpec(key.getBytes());
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        // key??8?
        Key secretKey = keyFactory.generateSecret(dks);
        Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
        IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
        AlgorithmParameterSpec paramSpec = iv;
        cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
        return new String(cipher.doFinal(hex2byte(data.getBytes())));
    } catch (Exception ex) {
        ex.printStackTrace();
        throw new SecurityException(ex);
    }
}

From source file:gov.nih.nci.security.util.AESEncryption.java

public AESEncryption(String passphrase, boolean isMD5Hash) throws EncryptionException {
    try {//from  w  w  w.j  a v a2  s  . c  o  m
        this.provider = new BouncyCastleProvider();
        SecretKeySpec skey = getSKeySpec(passphrase, isMD5Hash);
        encryptCipher = Cipher.getInstance(AES_ENCRYPTION_SCHEME, provider);
        decryptCipher = Cipher.getInstance(AES_ENCRYPTION_SCHEME, provider);
        encryptCipher.init(Cipher.ENCRYPT_MODE, skey);
        AlgorithmParameters ap = encryptCipher.getParameters();
        decryptCipher.init(Cipher.DECRYPT_MODE, skey, ap);
    } catch (NoSuchAlgorithmException e) {
        throw new EncryptionException(e);
    } catch (NoSuchPaddingException e) {
        throw new EncryptionException(e);
    } catch (InvalidKeyException e) {
        throw new EncryptionException(e);
    } catch (InvalidAlgorithmParameterException e) {
        throw new EncryptionException(e);
    }
}

From source file:edu.harvard.i2b2.analysis.security.RijndaelAlgorithm.java

public RijndaelAlgorithm(String password, int ksize, String encryptionType, String emethod) throws Exception {

    SecretKeySpec skeySpec = new SecretKeySpec(password.getBytes("UTF-8"), encryptionType);

    cipherEnc = Cipher.getInstance(emethod);
    cipherDec = Cipher.getInstance(emethod);

    keySize = ksize;/*from   w w w. jav a2s  . c o m*/

    //setKey( pword );
    cipherEnc.init(Cipher.ENCRYPT_MODE, skeySpec);
    cipherDec.init(Cipher.DECRYPT_MODE, skeySpec);

}

From source file:com.sshtools.j2ssh.transport.cipher.BlowfishCbc.java

/**
 *
 *
 * @param mode/* w  ww.  j  a v  a  2  s  .c  o  m*/
 * @param iv
 * @param keydata
 *
 * @throws AlgorithmOperationException
 */
public void init(int mode, byte[] iv, byte[] keydata) throws AlgorithmOperationException {
    try {
        cipher = Cipher.getInstance("Blowfish/CBC/NoPadding");

        // Create a 16 byte key
        byte[] actualKey = new byte[16];
        System.arraycopy(keydata, 0, actualKey, 0, actualKey.length);

        SecretKeySpec keyspec = new SecretKeySpec(actualKey, "Blowfish");

        // Create the cipher according to its algorithm
        cipher.init(((mode == ENCRYPT_MODE) ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE), keyspec,
                new IvParameterSpec(iv, 0, cipher.getBlockSize()));
    } catch (NoSuchPaddingException nspe) {
        log.error("Blowfish initialization failed", nspe);
        throw new AlgorithmOperationException("No Padding not supported");
    } catch (NoSuchAlgorithmException nsae) {
        log.error("Blowfish initialization failed", nsae);
        throw new AlgorithmOperationException("Algorithm not supported");
    } catch (InvalidKeyException ike) {
        log.error("Blowfish initialization failed", ike);
        throw new AlgorithmOperationException("Invalid encryption key");

        /*} catch (InvalidKeySpecException ispe) {
             throw new AlgorithmOperationException("Invalid encryption key specification");*/
    } catch (InvalidAlgorithmParameterException ape) {
        log.error("Blowfish initialization failed", ape);
        throw new AlgorithmOperationException("Invalid algorithm parameter");
    }
}

Example usage for javax.crypto Cipher DECRYPT_MODE

Introduction

Prototype

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Usage