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:edu.tufts.vue.util.Encryption.java

public static String decrypt(String encrypted) {
    try {/*from w ww. ja v  a2  s. c  om*/

        if (cipher == null)
            cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, getKey());
        byte[] encryptedBytes = hex.decode(encrypted.getBytes());
        byte[] recoveredBytes = cipher.doFinal(encryptedBytes);
        String recovered = new String(recoveredBytes);
        return recovered;
    } catch (Exception ex) {
        ex.printStackTrace();
        return encrypted;
    }
}

From source file:DesEncrypter.java

DesEncrypter(String passPhrase) throws Exception {
    int iterationCount = 2;
    KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
    SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
    ecipher = Cipher.getInstance(key.getAlgorithm());
    dcipher = Cipher.getInstance(key.getAlgorithm());

    AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);

    ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
    dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
}

From source file:de.scrubstudios.srvmon.notificator.classes.Crypt.java

public static String decrypt(String key, String data) {
    byte[] decryptedData = null;
    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");

    try {/*from  w  w w  .  j av a  2 s.  c o  m*/
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

        cipher.init(Cipher.DECRYPT_MODE, keySpec);
        //decryptedData = cipher.doFinal(Base64.decode(data));

        decryptedData = cipher.doFinal(Base64.decodeBase64(data));

        //return new String(decryptedData);

        return new String(decryptedData);
    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException
            | BadPaddingException ex) {
        Logger.getLogger(Crypt.class.getName()).log(Level.SEVERE, null, ex);
    }

    return null;
}

From source file:com.jopss.logico.negocio.util.CriptoUtils.java

public static String desDecode(String texto, String chave) {
    Cipher dcipher;//from w  ww .j av a  2s .c om
    SecretKey key;
    String decod = null;

    try {
        key = new SecretKeySpec(chave.getBytes(), 0, 8, "DES");
        dcipher = Cipher.getInstance("DES");
        dcipher.init(Cipher.DECRYPT_MODE, key);
        byte[] dec = Hex.decodeHex(texto.toCharArray());
        byte[] utf8 = dcipher.doFinal(dec);
        decod = new String(utf8, "UTF8");
    } catch (Exception e) {
        log.error(e);
    }

    return decod;
}

From source file:BD.Encriptador.java

public static String Desencriptar(String textoEncriptado) throws Exception {

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

    try {// w ww  . j a  va  2s. co m
        byte[] message = Base64.decodeBase64(textoEncriptado.getBytes("utf-8"));
        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 decipher = Cipher.getInstance("DESede");
        decipher.init(Cipher.DECRYPT_MODE, key);

        byte[] plainText = decipher.doFinal(message);

        base64EncryptedString = new String(plainText, "UTF-8");

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

From source file:lib.clases_cripto.java

public static String Desencriptar(String textoEncriptado) throws Exception {

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

    try {/*from w ww.  j  av a  2  s.  c o  m*/
        byte[] message = Base64.decodeBase64(textoEncriptado.getBytes("utf-8"));
        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 decipher = Cipher.getInstance("DESede");
        decipher.init(Cipher.DECRYPT_MODE, key);

        byte[] plainText = decipher.doFinal(message);

        base64EncryptedString = new String(plainText, "UTF-8");

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

From source file:com.lingxiang2014.util.RSAUtils.java

public static byte[] decrypt(PrivateKey privateKey, byte[] data) {
    Assert.notNull(privateKey);//from  w  w w  .  java 2s . com
    Assert.notNull(data);
    try {
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", PROVIDER);
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        return cipher.doFinal(data);
    } catch (Exception e) {
        return null;
    }
}

From source file:controlpac.EncryptHelper.java

public static String Desencriptar(String textoEncriptado) {
    String base64EncryptedString = "";
    try {/*from  ww w  .  ja v a2  s .  c  o  m*/
        byte[] message = Base64.decodeBase64(textoEncriptado.getBytes("utf-8"));//Desencodea el texto en base64
        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8")); //Crea un hash con la clave elegida
        byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        SecretKey key = new SecretKeySpec(keyBytes, "DESede");//Crea la clave 
        Cipher decipher = Cipher.getInstance("DESede");
        decipher.init(Cipher.DECRYPT_MODE, key); //Inicia el descifrado
        byte[] plainText = decipher.doFinal(message);//Descifra el texto
        base64EncryptedString = new String(plainText, "UTF-8");
    } catch (Exception ex) {
    }
    return base64EncryptedString;
}

From source file:com.salesmanager.core.util.EncryptionUtil.java

public static String decrypt(String key, String value) throws Exception {

    if (value == null || value.equals(""))
        return "";

    // NEED TO UNDERSTAND WHY PKCS5Padding DOES NOT WORK
    // Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
    IvParameterSpec ivSpec = new IvParameterSpec("fedcba9876543210".getBytes());
    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
    byte[] outText;
    outText = cipher.doFinal(hexToBytes(value));
    return new String(outText);

}

From source file:de.fhdo.helper.DES.java

public static String decrypt(String Text) {
    try {//from   w ww . java 2s .co  m
        DESKeySpec keySpec = new DESKeySpec("schluessel_stdrepository15".getBytes("UTF8"));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey key = keyFactory.generateSecret(keySpec);

        byte[] encrypedPwdBytes = Base64.decodeBase64(Text);
        Cipher cipher = Cipher.getInstance("DES");// cipher is not thread safe
        cipher.init(Cipher.DECRYPT_MODE, key);

        byte[] plainTextPwdBytes = (cipher.doFinal(encrypedPwdBytes));

        return new String(plainTextPwdBytes);

    } catch (Exception e) {
        e.printStackTrace();
    }

    return "";
}

Example usage for javax.crypto Cipher DECRYPT_MODE

Introduction

Prototype

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