Example usage for javax.crypto Cipher DECRYPT_MODE

List of usage examples for javax.crypto Cipher DECRYPT_MODE

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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:uploadProcess.java

public static boolean decrypt(File inputFolder, String fileName, String patientID, String viewKey) {
    try {//from w w w . ja va  2s.c  om

        String ukey = GetKey.getPatientKey(patientID);
        if (viewKey.equals(ukey)) {
            //Download File from Cloud..
            DropboxUpload download = new DropboxUpload();
            download.downloadFile(fileName, StoragePath.getDropboxDir() + patientID, inputFolder);

            File inputFile = new File(inputFolder.getAbsolutePath() + File.separator + fileName);
            FileInputStream fis = new FileInputStream(inputFile);
            File outputFolder = new File(inputFolder.getAbsolutePath() + File.separator + "temp");
            if (!outputFolder.exists()) {
                outputFolder.mkdir();
            }
            FileOutputStream fos = new FileOutputStream(
                    outputFolder.getAbsolutePath() + File.separator + fileName);
            byte[] k = ukey.getBytes();
            SecretKeySpec key = new SecretKeySpec(k, "AES");
            Cipher enc = Cipher.getInstance("AES");
            enc.init(Cipher.DECRYPT_MODE, key);
            CipherOutputStream cos = new CipherOutputStream(fos, enc);
            byte[] buf = new byte[1024];
            int read;
            while ((read = fis.read(buf)) != -1) {
                cos.write(buf, 0, read);
            }
            fis.close();
            fos.flush();
            cos.close();
            return true;
        } else {
            return false;
        }
    } catch (Exception e) {
        System.out.println("Error: " + e);
    }
    return false;
}

From source file:ch.cyberduck.core.aquaticprime.DictionaryLicense.java

protected void verify(final NSDictionary dictionary, final String publicKey) throws InvalidLicenseException {
    if (null == dictionary) {
        throw new InvalidLicenseException();
    }//w  ww  .  j  a v  a2s.  c om
    final NSData signature = (NSData) dictionary.objectForKey("Signature");
    if (null == signature) {
        log.warn(String.format("Missing key 'Signature' in dictionary %s", dictionary));
        throw new InvalidLicenseException();
    }
    // Append all values
    StringBuilder values = new StringBuilder();
    final ArrayList<String> keys = new ArrayList<>(dictionary.keySet());
    // Sort lexicographically by key
    Collections.sort(keys, new NaturalOrderComparator());
    for (String key : keys) {
        if ("Signature".equals(key)) {
            continue;
        }
        values.append(dictionary.objectForKey(key).toString());
    }
    byte[] signaturebytes = signature.bytes();
    byte[] plainbytes = values.toString().getBytes(Charset.forName("UTF-8"));
    try {
        final BigInteger modulus = new BigInteger(StringUtils.removeStart(publicKey, "0x"), 16);
        final BigInteger exponent = new BigInteger(Base64.decodeBase64("Aw=="));
        final KeySpec spec = new RSAPublicKeySpec(modulus, exponent);

        final PublicKey rsa = KeyFactory.getInstance("RSA").generatePublic(spec);
        final Cipher rsaCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        rsaCipher.init(Cipher.DECRYPT_MODE, rsa);
        final MessageDigest sha1Digest = MessageDigest.getInstance("SHA1");
        if (!Arrays.equals(rsaCipher.doFinal(signaturebytes), sha1Digest.digest(plainbytes))) {
            throw new InvalidLicenseException();
        }
    } catch (NoSuchPaddingException | BadPaddingException | IllegalBlockSizeException | InvalidKeyException
            | InvalidKeySpecException | NoSuchAlgorithmException e) {
        log.warn(String.format("Signature verification failure for key %s", file));
        throw new InvalidLicenseException();
    }
    if (log.isInfoEnabled()) {
        log.info(String.format("Valid key in %s", file));
    }
}

From source file:corner.util.crypto.Cryptor.java

/**
 * ?IO?.IO?,.//from w w  w.  j a  va  2  s  . c  om
 * @param inputFileName ????.
 * @param keyFile ??.
 * @return ?IO?.
 */
public static InputStream dencryptFileIO(String inputFileName, String keyFile) {
    if (keyFile == null) {
        try {
            return new FileInputStream(new File(inputFileName));
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        }
    }
    SecretKey key = null;

    ObjectInputStream keyis;
    try {
        keyis = new ObjectInputStream(new FileInputStream(keyFile));
        key = (SecretKey) keyis.readObject();

        keyis.close();
    } catch (FileNotFoundException e) {
        throw new RuntimeException(e);
    } catch (IOException e) {
        throw new RuntimeException(e);
    } catch (ClassNotFoundException e) {
        throw new RuntimeException(e);
    }

    //keyCipher
    Cipher cipher = null;

    try {
        //,
        cipher = Cipher.getInstance("DES");
        // ?
        cipher.init(Cipher.DECRYPT_MODE, key);
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException(e);
    } catch (NoSuchPaddingException e) {
        throw new RuntimeException(e);
    } catch (InvalidKeyException e) {
        throw new RuntimeException(e);
    }

    File file = new File(inputFileName);

    try {

        //?
        CipherInputStream in = new CipherInputStream(new BufferedInputStream(new FileInputStream(file)),
                cipher);
        return in;

    } catch (Exception e) {
        throw new RuntimeException(e);

    }

}

From source file:hh.learnj.test.license.test.rsacoder.RSACoder.java

/**
 * //from   www.  j a va2s  .com
 * 
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] decryptByPublicKey(byte[] data, byte[] key) throws Exception {

    // 
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ?
    // ???
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
    // 
    PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, pubKey);
    return cipher.doFinal(data);
}

From source file:hudson.util.Secret.java

/**
 * Reverse operation of {@link #getEncryptedValue()}. Returns null
 * if the given cipher text was invalid.
 *//*from w  ww.  ja  va2 s. c  om*/
public static Secret decrypt(String data) {
    if (data == null)
        return null;
    try {
        byte[] in = Base64.decode(data.toCharArray());
        Secret s = tryDecrypt(KEY.decrypt(), in);
        if (s != null)
            return s;

        // try our historical key for backward compatibility
        Cipher cipher = getCipher("AES");
        cipher.init(Cipher.DECRYPT_MODE, getLegacyKey());
        return tryDecrypt(cipher, in);
    } catch (GeneralSecurityException e) {
        return null;
    } catch (UnsupportedEncodingException e) {
        throw new Error(e); // impossible
    } catch (IOException e) {
        return null;
    }
}

From source file:dz.alkhwarizmix.framework.java.utils.CryptoUtil.java

/**
 * decryptString/*  w w  w .j a  v a  2s.c  om*/
 */
public final String decryptString(String hexStringToDecrypt) {

    String result = null;
    byte[] dataToDecrypt = null;
    byte[] decrypted = null;

    dataToDecrypt = hex2Byte(hexStringToDecrypt);

    try {
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);
        decrypted = cipher.doFinal(dataToDecrypt);
        result = hexToString(byte2hex(decrypted));
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    }

    return result;
}

From source file:ch.cyberduck.core.aquaticprime.DonationKey.java

/**
 * @return True if valid license key/*from   ww  w. ja v a 2 s .co  m*/
 */
@Override
public boolean verify() {
    if (null == dictionary) {
        return false;
    }
    final NSData signature = (NSData) dictionary.objectForKey("Signature");
    if (null == signature) {
        log.warn(String.format("Missing key 'Signature' in dictionary %s", dictionary));
        return false;
    }
    // Append all values
    StringBuilder values = new StringBuilder();
    final ArrayList<String> keys = new ArrayList<>(dictionary.keySet());
    // Sort lexicographically by key
    Collections.sort(keys, new NaturalOrderComparator());
    for (String key : keys) {
        if ("Signature".equals(key)) {
            continue;
        }
        values.append(dictionary.objectForKey(key).toString());
    }
    byte[] signaturebytes = signature.bytes();
    byte[] plainbytes = values.toString().getBytes(Charset.forName("UTF-8"));
    final boolean valid;
    try {
        final BigInteger modulus = new BigInteger(StringUtils.removeStart(this.getPublicKey(), "0x"), 16);
        final BigInteger exponent = new BigInteger(Base64.decodeBase64("Aw=="));
        final KeySpec spec = new RSAPublicKeySpec(modulus, exponent);

        final PublicKey rsa = KeyFactory.getInstance("RSA").generatePublic(spec);
        final Cipher rsaCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        rsaCipher.init(Cipher.DECRYPT_MODE, rsa);
        final MessageDigest sha1Digest = MessageDigest.getInstance("SHA1");
        valid = Arrays.equals(rsaCipher.doFinal(signaturebytes), sha1Digest.digest(plainbytes));
    } catch (NoSuchPaddingException | BadPaddingException | IllegalBlockSizeException | InvalidKeyException
            | InvalidKeySpecException | NoSuchAlgorithmException e) {
        log.warn(String.format("Signature verification failure for key %s", file));
        return false;
    }
    if (valid) {
        if (log.isInfoEnabled()) {
            log.info(String.format("Valid key in %s", file));
        }
    } else {
        log.warn(String.format("Not a valid key in %s", file));
    }
    return valid;
}

From source file:com.predic8.membrane.core.interceptor.balancer.ClusterNotificationInterceptor.java

private Map<String, String> getDecryptedParams(String data) throws Exception {
    Cipher cipher = Cipher.getInstance("AES");
    SecretKeySpec skeySpec = new SecretKeySpec(Hex.decodeHex(keyHex.toCharArray()), "AES");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    return parseQueryString(new String(cipher.doFinal(Base64.decodeBase64(data.getBytes("UTF-8"))), "UTF-8"));
}

From source file:org.runway.utils.StringEncryptDecryptUtil.java

public static String decrypt(String value) throws RunwaySecurityException {
    String result = null;/*from  ww  w .j  av  a2 s  .co m*/
    SecretKeyFactory keyFactory;

    try {

        keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
        Cipher pbeCipher = Cipher.getInstance(ALGORITHM);
        pbeCipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
        result = new String(pbeCipher.doFinal(base64Decode(value)));

    } catch (NoSuchAlgorithmException e) {
        throw new RunwaySecurityException(e);
    } catch (InvalidKeySpecException e) {
        throw new RunwaySecurityException(e);
    } catch (NoSuchPaddingException e) {
        throw new RunwaySecurityException(e);
    } catch (InvalidKeyException e) {
        throw new RunwaySecurityException(e);
    } catch (InvalidAlgorithmParameterException e) {
        throw new RunwaySecurityException(e);
    } catch (IllegalBlockSizeException e) {
        throw new RunwaySecurityException(e);
    } catch (BadPaddingException e) {
        throw new RunwaySecurityException(e);
    } catch (IOException e) {
        throw new RunwaySecurityException(e);
    }

    return result;
}

From source file:CipherProvider.java

/**
 * Cipher setuped for decryption// w w  w. ja  va 2s  .  c  o m
 *
 * @return Cipher setuped for decryption
 */
Cipher getDecryptCipher() {
    if (StringUtils.isNotBlank(password) && (decryptCipher == null)) {
        decryptCipher = getCipher(password, Cipher.DECRYPT_MODE);
    }
    return decryptCipher;
}