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:Main.java

public static boolean decryptFile(byte[] key, byte[] iv, String sourceFilePath, String destFilePath) {
    return handleFile(Cipher.DECRYPT_MODE, key, iv, sourceFilePath, destFilePath);
}

From source file:MainClass.java

public static void desEncrypt(String f1, String f2) throws Exception {
    SecretKey key = null;/*from  w  w  w .jav  a 2  s .  c om*/

    ObjectInputStream keyFile = new ObjectInputStream(new FileInputStream("DESKey.ser"));
    key = (SecretKey) keyFile.readObject();
    keyFile.close();
    Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, key);
    CipherInputStream in = new CipherInputStream(new BufferedInputStream(new FileInputStream(f1)), cipher);
    BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(f2));
    int i;
    do {
        i = in.read();
        if (i != -1)
            out.write(i);
    } while (i > 0);
    in.close();
    out.close();
}

From source file:Main.java

private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    return cipher.doFinal(encrypted);
}

From source file:MainClass.java

public static void blowfishEncrypt(String f1, String f2) throws Exception {
    SecretKey key = null;/*  www.ja  v a  2  s .c o m*/

    ObjectInputStream keyFile = new ObjectInputStream(new FileInputStream("BlowfishKey.ser"));
    key = (SecretKey) keyFile.readObject();
    keyFile.close();
    Cipher cipher = Cipher.getInstance("Blowfish/ECB/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, key);
    CipherInputStream in = new CipherInputStream(new BufferedInputStream(new FileInputStream(f1)), cipher);
    BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(f2));
    int i;
    do {
        i = in.read();
        if (i != -1)
            out.write(i);
    } while (i > 0);
    in.close();
    out.close();
}

From source file:Main.java

private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    byte[] decrypted = cipher.doFinal(encrypted);
    return decrypted;
}

From source file:Main.java

public static byte[] decrypt(byte[] data, byte[] key, byte[] iv, String cipherAlgorithm) {
    try {//from  ww w .  j  av  a 2 s.  c om
        Cipher cipher = initCipher(Cipher.DECRYPT_MODE, key, iv, cipherAlgorithm);
        return cipher.doFinal(data);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

From source file:Main.java

/**
 * Decrypt data//from  w ww  .j av  a2 s. com
 * @param secretKey -   a secret key used for decryption
 * @param data      -   data to decrypt
 * @return   Decrypted data
 * @throws Exception
 */
public static String decipher(String secretKey, String data) throws Exception {
    // Key has to be of length 8
    if (secretKey == null || secretKey.length() != 8)
        throw new Exception("Invalid key length - 8 bytes key needed!");

    SecretKey key = new SecretKeySpec(secretKey.getBytes(), ALGORITHM);
    Cipher cipher = Cipher.getInstance(ALGORITHM);
    cipher.init(Cipher.DECRYPT_MODE, key);

    return new String(cipher.doFinal(toByte(data)));
}

From source file:Main.java

public static String decrypt(byte[] cipherText) {
    SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");

    Cipher cipher = null;//from w  w w  . java2  s.  c  o  m
    byte[] clearText = null;

    try {
        // init cipher
        cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, keySpec);
        clearText = cipher.doFinal(Base64.decode(new String(cipherText), 10));
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {// TODO Auto-generated catch block
        e.printStackTrace();
    }

    return new String(clearText);
}

From source file:Main.java

public static byte[] decryptMessage(String key, byte[] input) throws Exception {
    if ((input == null) || (input.length <= 0)) {
        return null;
    }//from ww  w . ja v  a  2s.  c o m
    try {
        return doFinal(key, Cipher.DECRYPT_MODE, input);
    } catch (Exception e) {
        throw new Exception("201");
    }
}

From source file:Main.java

/**
 * RSA decryption/*from   www .j  ava  2 s  . co m*/
 * @param priKey
 * @param message
 * @return
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws NoSuchPaddingException
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException
 */
public static byte[] decryptRSA(RSAPrivateKey priKey, byte[] message) throws IllegalBlockSizeException,
        BadPaddingException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException {
    Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
    cipher.init(Cipher.DECRYPT_MODE, priKey);

    return cipher.doFinal(message);
}

Example usage for javax.crypto Cipher DECRYPT_MODE

Introduction

Prototype

Document

Usage