Example usage for javax.crypto Cipher DECRYPT_MODE

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:net.fender.crypto.CryptoUtil.java

/**
 * @param keyName/*from   www.  j  a  va  2 s .c o m*/
 * @param base64Encoded
 * @return
 * @throws GeneralSecurityException
 */
public static String decryptUsingSystemPropertyKey(String keyName, String base64Encoded)
        throws GeneralSecurityException {
    byte[] encryptedBytes = Base64.decodeBase64(base64Encoded.getBytes());
    Key key = getSystemPropertyKey(keyName);
    Cipher cipher = Cipher.getInstance(key.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, key);
    byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
    String decrypted = new String(decryptedBytes);
    return decrypted;
}

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From source file:br.com.ufjf.labredes.crypto.Cryptography.java

public static Object decrypt(String encryptedObject, byte[] aesKey) {
    Object object = null;//from w  w w  . ja  v a  2s  . c om
    SecretKeySpec secretKey = new SecretKeySpec(aesKey, ALGORITHM_SYM);
    try {
        byte[] cipherText = new BASE64Decoder().decodeBuffer(encryptedObject);
        Cipher cipher = Cipher.getInstance(ALGORITHM_SYM);
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] serialized_obj = cipher.doFinal(cipherText);
        object = (Object) SerializationUtils.deserialize(serialized_obj);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return object;
}

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From source file:bobs.is.compress.sevenzip.AES256SHA256Decoder.java

@Override
InputStream decode(final String archiveName, final InputStream in, final long uncompressedLength,
        final Coder coder, final byte[] passwordBytes) throws IOException {
    return new InputStream() {
        private boolean isInitialized = false;
        private CipherInputStream cipherInputStream = null;

        private CipherInputStream init() throws IOException {
            if (isInitialized) {
                return cipherInputStream;
            }//  w w  w.  j  a  v a2s .  co m
            final int byte0 = 0xff & coder.properties[0];
            final int numCyclesPower = byte0 & 0x3f;
            final int byte1 = 0xff & coder.properties[1];
            final int ivSize = ((byte0 >> 6) & 1) + (byte1 & 0x0f);
            final int saltSize = ((byte0 >> 7) & 1) + (byte1 >> 4);
            if (2 + saltSize + ivSize > coder.properties.length) {
                throw new IOException("Salt size + IV size too long in " + archiveName);
            }
            final byte[] salt = new byte[saltSize];
            System.arraycopy(coder.properties, 2, salt, 0, saltSize);
            final byte[] iv = new byte[16];
            System.arraycopy(coder.properties, 2 + saltSize, iv, 0, ivSize);

            if (passwordBytes == null) {
                throw new PasswordRequiredException(archiveName);
            }
            final byte[] aesKeyBytes;
            if (numCyclesPower == 0x3f) {
                aesKeyBytes = new byte[32];
                System.arraycopy(salt, 0, aesKeyBytes, 0, saltSize);
                System.arraycopy(passwordBytes, 0, aesKeyBytes, saltSize,
                        Math.min(passwordBytes.length, aesKeyBytes.length - saltSize));
            } else {
                final MessageDigest digest;
                try {
                    digest = MessageDigest.getInstance("SHA-256");
                } catch (final NoSuchAlgorithmException noSuchAlgorithmException) {
                    throw new IOException("SHA-256 is unsupported by your Java implementation",
                            noSuchAlgorithmException);
                }
                final byte[] extra = new byte[8];
                for (long j = 0; j < (1L << numCyclesPower); j++) {
                    digest.update(salt);
                    digest.update(passwordBytes);
                    digest.update(extra);
                    for (int k = 0; k < extra.length; k++) {
                        ++extra[k];
                        if (extra[k] != 0) {
                            break;
                        }
                    }
                }
                aesKeyBytes = digest.digest();
            }

            final SecretKey aesKey = new SecretKeySpec(aesKeyBytes, "AES");
            try {
                final Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
                cipher.init(Cipher.DECRYPT_MODE, aesKey, new IvParameterSpec(iv));
                cipherInputStream = new CipherInputStream(in, cipher);
                isInitialized = true;
                return cipherInputStream;
            } catch (final GeneralSecurityException generalSecurityException) {
                throw new IOException("Decryption error "
                        + "(do you have the JCE Unlimited Strength Jurisdiction Policy Files installed?)",
                        generalSecurityException);
            }
        }

        @Override
        public int read() throws IOException {
            return init().read();
        }

        @Override
        public int read(final byte[] b, final int off, final int len) throws IOException {
            return init().read(b, off, len);
        }

        @Override
        public void close() {
        }
    };
}

---

From source file:com.ubipass.middleware.web.action.LicenceMgtAction.java

private String getDate(String userName, String licenceKey) throws Exception {

    // DES????/*  w  w w . jav  a 2  s .c om*/
    SecureRandom sr = new SecureRandom();

    byte rawKeyData[] = (userName + "midware").getBytes();

    // ?DESKeySpec
    DESKeySpec dks = new DESKeySpec(rawKeyData);

    // ?DESKeySpec??
    // SecretKey
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey key = keyFactory.generateSecret(dks);

    // Cipher??
    Cipher cipher = Cipher.getInstance("DES");

    // ?Cipher
    cipher.init(Cipher.DECRYPT_MODE, key, sr);

    // ??
    licenceKey = new String(cipher.doFinal(Base64.decodeBase64(licenceKey.getBytes())));

    String[] tmpStr = licenceKey.split("-");

    if (tmpStr.length == 2)
        return tmpStr[1];

    throw new InvalidLicenseException();

}

---

From source file:com.titilink.common.app.EncryptDecryptUtil.java

public void testDES() throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException,
        NoSuchPaddingException, BadPaddingException, IllegalBlockSizeException {
    ///*from  w  ww.  j  a va2  s. c om*/
    DESKeySpec desKeySpec = new DESKeySpec("SECURITY".getBytes(Charset.forName("UTF-8")));
    SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secretKey = secretKeyFactory.generateSecret(desKeySpec);

    //??
    Cipher cipher = Cipher.getInstance("DES");
    cipher.init(Cipher.ENCRYPT_MODE, secretKey, new SecureRandom());
    byte[] cipherData = cipher
            .doFinal("this is a security text from server".getBytes(Charset.forName("UTF-8")));

    //?
    Cipher cipher1 = Cipher.getInstance("DES");
    cipher1.init(Cipher.DECRYPT_MODE, secretKey, new SecureRandom());
    byte[] plainData = cipher1.doFinal(cipherData);
    System.out.println(new String(plainData, Charset.forName("UTF-8")));
}

---

From source file:net.thewaffleshop.nimbus.api.EncryptionAPI.java

/**
 * Decrypt/*from   ww w.jav a  2  s . c o  m*/
 *
 * @param secretKey
 * @param iv
 * @param secret
 * @return
 */
public byte[] decrypt(SecretKey secretKey, byte[] iv, byte[] secret) {
    try {
        IvParameterSpec ivSpec = new IvParameterSpec(iv);
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, secretKey, ivSpec);
        byte[] ret = cipher.doFinal(secret);
        return ret;
    } catch (GeneralSecurityException e) {
        throw new RuntimeException(e);
    }
}

---

From source file:models.logic.CipherDecipher.java

public static void encryptOrDecrypt(SecretKey key, int mode, InputStream is, OutputStream os) throws Throwable {
    Cipher cipher = Cipher.getInstance("AES");
    if (mode == Cipher.ENCRYPT_MODE) {
        cipher.init(Cipher.ENCRYPT_MODE, key);
        CipherInputStream cis = new CipherInputStream(is, cipher);
        doCopy(cis, os);// w w w. ja  va  2 s.  co m
    } else if (mode == Cipher.DECRYPT_MODE) {
        cipher.init(Cipher.DECRYPT_MODE, key);
        CipherOutputStream cos = new CipherOutputStream(os, cipher);
        doCopy(is, cos);
    }
}

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From source file:com.shenit.commons.codec.RsaUtils.java

/**
 * //w  w w .j a v  a2s.c o m
 * 
 * @param content
 *            
 * @param privateKey
 *            ?
 * @param inputCharset
 *            ??
 * @return ?
 */
public static String decrypt(String content, String privateKey, String inputCharset) {
    InputStream ins = null;
    ByteArrayOutputStream writer = null;
    String result = null;
    try {
        PrivateKey prikey = getPrivateKey(privateKey);

        Cipher cipher = Cipher.getInstance(CODEC_RSA);
        cipher.init(Cipher.DECRYPT_MODE, prikey);

        ins = new ByteArrayInputStream(Base64.decodeBase64(content));
        writer = new ByteArrayOutputStream();
        // rsa?128?128?
        byte[] buf = new byte[128];
        int bufl;

        while ((bufl = ins.read(buf)) != -1) {
            byte[] block = null;

            if (buf.length == bufl) {
                block = buf;
            } else {
                block = new byte[bufl];
                for (int i = 0; i < bufl; i++) {
                    block[i] = buf[i];
                }
            }

            writer.write(cipher.doFinal(block));
        }
        result = new String(writer.toByteArray(), inputCharset);
    } catch (Exception ex) {
        if (LOG.isWarnEnabled())
            LOG.warn("[decrypt] Decrypt failed with exception.", ex);
    } finally {
        IOUtils.closeQuietly(writer);
        IOUtils.closeQuietly(ins);
    }

    return result;
}

---

From source file:io.stallion.utils.Encrypter.java

private static String doDecryptString(String password, String encryptedBase32) throws Exception {
    encryptedBase32 = StringUtils.strip(encryptedBase32, "=");
    String salt = encryptedBase32.substring(0, 16);
    String ivString = encryptedBase32.substring(16, 48);
    byte[] iv = new byte[0];
    try {/*from  w w  w . j  a  v a2s . c o m*/
        iv = Hex.decodeHex(ivString.toCharArray());
    } catch (DecoderException e) {
        throw new RuntimeException(e);
    }
    encryptedBase32 = encryptedBase32.substring(48);
    Base32 decoder = new Base32();
    byte[] encrypted = decoder.decode(encryptedBase32.toUpperCase());
    SecretKeySpec skeySpec = makeKeySpec(password, salt);

    /*
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec,
            new IvParameterSpec(iv));
      */
    Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec, new GCMParameterSpec(128, iv));

    byte[] original = cipher.doFinal(encrypted);
    return new String(original, Charset.forName("UTF-8"));

}

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From source file:mitm.common.security.crypto.PBDecryptionInputStream.java

private void init(String algorithm, byte[] salt, int iterationCount) throws CryptoException {
    try {/*from w  w w .  j a  v  a  2 s. co  m*/
        SecurityFactory securityFactory = SecurityFactoryFactory.getSecurityFactory();

        SecretKeyFactory keyFactory = securityFactory.createSecretKeyFactory(algorithm);

        PBEKeySpec keySpec = new PBEKeySpec(password, salt, iterationCount);

        /*
         * Clear out the password
         */
        Arrays.fill(password, '#');

        Key secretKey = keyFactory.generateSecret(keySpec);

        cipher = securityFactory.createCipher(algorithm);

        cipher.init(Cipher.DECRYPT_MODE, secretKey);
    } catch (NoSuchProviderException e) {
        throw new NoSuchProviderRuntimeException(e);
    } catch (NoSuchAlgorithmException e) {
        throw new CryptoException(e);
    } catch (InvalidKeySpecException e) {
        throw new CryptoException(e);
    } catch (NoSuchPaddingException e) {
        throw new CryptoException(e);
    } catch (InvalidKeyException e) {
        throw new CryptoException(e);
    }
}

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