Example usage for javax.crypto Cipher getInstance

List of usage examples for javax.crypto Cipher getInstance

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Introduction

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

Prototype

public static final Cipher getInstance(String transformation)
        throws NoSuchAlgorithmException, NoSuchPaddingException

Source Link

Document

Returns a Cipher object that implements the specified transformation.

Usage

From source file:Main.java

public static byte[] TDesDec(byte[] key, byte[] in) throws Exception {

    Key deskey = null;/*  ww  w .jav  a 2  s  .  c  om*/
    byte[] tdesKey = new byte[24];
    if (key.length % 8 != 0)
        return null;

    if (key.length == 8) {
        System.arraycopy(key, 0, tdesKey, 0, 8);
        System.arraycopy(key, 0, tdesKey, 8, 8);
        System.arraycopy(key, 0, tdesKey, 16, 8);
    }

    if (key.length == 16) {
        System.arraycopy(key, 0, tdesKey, 0, 16);
        System.arraycopy(key, 0, tdesKey, 16, 8);
    }

    DESedeKeySpec spec = new DESedeKeySpec(tdesKey);
    SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
    deskey = keyfactory.generateSecret(spec);

    Cipher cipher = Cipher.getInstance("desede" + "/ECB/NoPadding");

    cipher.init(Cipher.DECRYPT_MODE, deskey);
    byte[] bOut = cipher.doFinal(in);

    return bOut;
}

From source file:Main.java

public static byte[] TDesEnc(byte[] key, byte[] in) throws Exception {

    Key deskey = null;/*from w  ww .j a v  a  2 s  . c om*/
    byte[] tdesKey = new byte[24];
    if (key.length % 8 != 0)
        return null;

    if (key.length == 8) {
        System.arraycopy(key, 0, tdesKey, 0, 8);
        System.arraycopy(key, 0, tdesKey, 8, 8);
        System.arraycopy(key, 0, tdesKey, 16, 8);
    }

    if (key.length == 16) {
        System.arraycopy(key, 0, tdesKey, 0, 16);
        System.arraycopy(key, 0, tdesKey, 16, 8);
    }

    DESedeKeySpec spec = new DESedeKeySpec(tdesKey);
    SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
    deskey = keyfactory.generateSecret(spec);

    Cipher cipher = Cipher.getInstance("desede" + "/ECB/NoPadding");

    cipher.init(Cipher.ENCRYPT_MODE, deskey);
    byte[] bOut = cipher.doFinal(in);

    return bOut;
}

From source file:br.com.zeros.tipsandtricks.cryto.EncryptionStrings.java

public static String encrypt(String valueToEnc) throws Exception {
    Key key = generateKey();//from  www  . j  av  a  2 s  .co m
    Cipher c = Cipher.getInstance(ALGORITHM);
    c.init(Cipher.ENCRYPT_MODE, key);
    byte[] encValue = c.doFinal(valueToEnc.getBytes());
    String encryptedValue = new Base64().encodeToString(encValue);
    return encryptedValue;
}

From source file:com.sds.acube.ndisc.xnapi.XNApiDesCipher.java

/**
 * //from  w  w w.  j a va  2s .  c om
 * 
 * @param data  ?
 * @return  ?
 */
public static String decrypt(String data) {
    try {
        Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, getKey());
        byte d[] = cipher.doFinal(Base64.decodeBase64(data.getBytes()));
        return new String(d);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

From source file:Main.java

private static byte[] cryptBy3Des(byte input[], byte key[], int cryptModel, byte iv[]) throws Exception {
    try {// ww  w  . j  a v  a2 s .  c o  m
        Key k = KeyGenerator(key);
        IvParameterSpec IVSpec = iv != null ? IvGenerator(iv) : IvGenerator(defaultIV);
        Cipher c = Cipher.getInstance(desAlgorithm);
        c.init(cryptModel, k, ((java.security.spec.AlgorithmParameterSpec) (IVSpec)));
        return c.doFinal(input);
    } catch (Exception e) {
        throw e;
    }
}

From source file:BD.Encriptador.java

public static String Encriptar(String texto) {

    String secretKey = "qualityinfosolutions"; //llave para encriptar datos
    String base64EncryptedString = "";

    try {/* w w w.  j  a  v a  2s .  c o  m*/

        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8"));
        byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);

        SecretKey key = new SecretKeySpec(keyBytes, "DESede");
        Cipher cipher = Cipher.getInstance("DESede");
        cipher.init(Cipher.ENCRYPT_MODE, key);

        byte[] plainTextBytes = texto.getBytes("utf-8");
        byte[] buf = cipher.doFinal(plainTextBytes);
        byte[] base64Bytes = Base64.encodeBase64(buf);
        base64EncryptedString = new String(base64Bytes);

    } catch (Exception ex) {
    }
    return base64EncryptedString;
}

From source file:controlpac.EncryptHelper.java

public static String Encriptar(String texto) {
    String base64EncryptedString = "";
    try {/*from   w w  w .  j av a 2 s.c o  m*/
        MessageDigest md = MessageDigest.getInstance("MD5"); //Crea un hash con la clave elegida
        byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8"));
        byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        SecretKey key = new SecretKeySpec(keyBytes, "DESede"); //Crea la clave
        Cipher cipher = Cipher.getInstance("DESede");
        cipher.init(Cipher.ENCRYPT_MODE, key);//Inicializa el cifrado con la clave
        byte[] plainTextBytes = texto.getBytes("utf-8");
        byte[] buf = cipher.doFinal(plainTextBytes);//Cifra el texto
        byte[] base64Bytes = Base64.encodeBase64(buf);//Encodea el texto en base64
        base64EncryptedString = new String(base64Bytes);
    } catch (Exception ex) {
    }
    return base64EncryptedString;
}

From source file:MainClass.java

private static String decrypt(char[] password, String text) throws Exception {
    String salt = text.substring(0, 12);
    String ciphertext = text.substring(12, text.length());
    BASE64Decoder decoder = new BASE64Decoder();
    byte[] saltArray = decoder.decodeBuffer(salt);
    byte[] ciphertextArray = decoder.decodeBuffer(ciphertext);

    PBEKeySpec keySpec = new PBEKeySpec(password);

    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithSHAAndTwofish-CBC");

    SecretKey key = keyFactory.generateSecret(keySpec);

    PBEParameterSpec paramSpec = new PBEParameterSpec(saltArray, 1000);

    Cipher cipher = Cipher.getInstance("PBEWithSHAAndTwofish-CBC");
    cipher.init(Cipher.DECRYPT_MODE, key, paramSpec);

    return new String(cipher.doFinal(ciphertextArray));
}

From source file:MainClass.java

public static void desEncrypt(String f1, String f2) throws Exception {
    SecretKey key = null;//from w  w  w .  ja  va2  s.co  m
    ObjectInputStream keyFile = new ObjectInputStream(new FileInputStream("DESKey.ser"));
    key = (SecretKey) keyFile.readObject();
    keyFile.close();

    KeyGenerator keygen = KeyGenerator.getInstance("DES");
    key = keygen.generateKey();
    ObjectOutputStream keyFileout = new ObjectOutputStream(new FileOutputStream("DESKey.ser"));
    keyFileout.writeObject(key);
    keyFileout.close();
    Cipher cipher = null;
    cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, key);
    BufferedInputStream in = new BufferedInputStream(new FileInputStream(f1));

    CipherOutputStream out = new CipherOutputStream(new BufferedOutputStream(new FileOutputStream(f2)), cipher);
    int i;
    do {
        i = in.read();
        if (i != -1)
            out.write(i);
    } while (i != -1);
    in.close();
    out.close();
}

From source file:Main.java

public static byte[] DESTemplet(byte[] data, byte[] key, String algorithm, String transformation,
        boolean isEncrypt) {
    try {//  w  w w .  ja va 2s. com
        SecretKeySpec keySpec = new SecretKeySpec(key, algorithm);
        Cipher cipher = Cipher.getInstance(transformation);
        SecureRandom random = new SecureRandom();
        cipher.init(isEncrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, keySpec, random);
        return cipher.doFinal(data);
    } catch (Throwable e) {
        e.printStackTrace();
    }
    return null;
}