Example usage for org.bouncycastle.crypto.paddings PKCS7Padding PKCS7Padding

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.paddings PKCS7Padding PKCS7Padding.

Prototype

PKCS7Padding

Source Link

Usage

From source file:ch.dissem.bitmessage.cryptography.bc.BouncyCryptography.java

License:Apache License

@Override
public byte[] crypt(boolean encrypt, byte[] data, byte[] key_e, byte[] initializationVector) {
    BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()),
            new PKCS7Padding());
    CipherParameters params = new ParametersWithIV(new KeyParameter(key_e), initializationVector);

    cipher.init(encrypt, params);/*from  w w  w .  ja  v a  2s  . c  om*/

    byte[] buffer = new byte[cipher.getOutputSize(data.length)];
    int length = cipher.processBytes(data, 0, data.length, buffer, 0);
    try {
        length += cipher.doFinal(buffer, length);
    } catch (InvalidCipherTextException e) {
        throw new IllegalArgumentException(e);
    }
    if (length < buffer.length) {
        return Arrays.copyOfRange(buffer, 0, length);
    }
    return buffer;
}

From source file:co.lqnt.lockbox.Cipher.java

License:Open Source License

/**
 * Construct a new bi-directional cipher.
 *//*from   w w  w .j a  v a 2s.  c o  m*/
public Cipher() {
    CodecInterface base64UriCodec = new Base64UriCodec();
    AsymmetricBlockCipher rsaCipher = new OAEPEncoding(new RSAEngine(), new SHA1Digest());
    BufferedBlockCipher aesCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()),
            new PKCS7Padding());
    Digest sha1Digest = new SHA1Digest();
    SecureRandom random = new SecureRandom();

    this.encryptionCipher = new EncryptionCipher(base64UriCodec, rsaCipher, aesCipher, sha1Digest, random);
    this.decryptionCipher = new DecryptionCipher(base64UriCodec, rsaCipher, aesCipher, sha1Digest);
}

From source file:co.lqnt.lockbox.DecryptionCipher.java

License:Open Source License

/**
 * Construct a new decryption cipher./*from   ww w.j a v a2  s. c  om*/
 */
public DecryptionCipher() {
    this.base64UriCodec = new Base64UriCodec();
    this.rsaCipher = new OAEPEncoding(new RSAEngine(), new SHA1Digest());
    this.aesCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), new PKCS7Padding());
    this.sha1Digest = new SHA1Digest();
    this.asciiCharset = Charset.forName("US-ASCII");
}

From source file:co.lqnt.lockbox.EncryptionCipher.java

License:Open Source License

/**
 * Construct a new encryption cipher.// w  w w.  j  av  a 2 s  . c o m
 */
public EncryptionCipher() {
    this.base64UriCodec = new Base64UriCodec();
    this.rsaCipher = new OAEPEncoding(new RSAEngine(), new SHA1Digest());
    this.aesCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), new PKCS7Padding());
    this.sha1Digest = new SHA1Digest();
    this.random = new SecureRandom();
    this.asciiCharset = Charset.forName("US-ASCII");
}

From source file:com.geoxp.oss.CryptoHelper.java

License:Apache License

/**
 * Pad data using PKCS7./*  w  ww .  j a  v  a 2s  .  c  o  m*/
 * 
 * @param alignment Alignement on which to pad, e.g. 8
 * @param data Data to pad
 * @return The padded data
 */
public static byte[] padPKCS7(int alignment, byte[] data, int offset, int len) {

    //
    // Allocate the target byte array. Its size is a multiple of 'alignment'.
    // If data to pad is a multiple of 'alignment', the target array will be
    // 'alignment' bytes longer than the data to pad.
    //

    byte[] target = new byte[len + (alignment - len % alignment)];

    //
    // Copy the data to pad into the target array
    //

    System.arraycopy(data, offset, target, 0, len);

    //
    // Add padding bytes
    //

    PKCS7Padding padding = new PKCS7Padding();

    padding.addPadding(target, len);

    return target;
}

From source file:com.geoxp.oss.CryptoHelper.java

License:Apache License

/**
 * Remove PKCS7 padding from padded data
 * @param padded The padded data to 'unpad'
 * @return The original unpadded data//from   w ww  . j av a2  s.c  o m
 * @throws InvalidCipherTextException if data is not correctly padded
 */
public static byte[] unpadPKCS7(byte[] padded) throws InvalidCipherTextException {
    PKCS7Padding padding = new PKCS7Padding();

    //
    // Determine length of padding
    //

    int pad = padding.padCount(padded);

    //
    // Allocate array for unpadded data
    //

    byte[] unpadded = new byte[padded.length - pad];

    //
    // Copy data without the padding
    //

    System.arraycopy(padded, 0, unpadded, 0, padded.length - pad);

    return unpadded;
}

From source file:com.github.flbaue.jcrypttool.v1.DecryptionRunnable.java

License:Apache License

@Override
public void run() {
    PaddedBufferedBlockCipher cipher;//from w  ww .ja  va2s. c o  m
    byte[] key;
    byte[] iv;
    byte[] salt;

    try (InputStream fileInputStream = new BufferedInputStream(
            new FileInputStream(encryptionSettings.inputFile))) {

        cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), new PKCS7Padding());
        salt = extractSalt(fileInputStream);
        iv = extractIV(fileInputStream);
        key = generateKey(encryptionSettings.password, salt);
        KeyParameter keyParam = new KeyParameter(key);
        CipherParameters params = new ParametersWithIV(keyParam, iv);
        cipher.init(false, params);

        /*
        System.out.println(getClass().getName() + " salt:\t" + Base64.toBase64String(salt) + " (" + salt.length + " byte)");
        System.out.println(getClass().getName() + " key:\t" + Base64.toBase64String(key) + " (" + key.length + " byte)");
        System.out.println(getClass().getName() + " iv:\t\t" + Base64.toBase64String(iv) + " (" + iv.length + " byte)");
        */

        InputStream in = null;
        OutputStream out = null;
        try {
            in = new GZIPInputStream(new CipherInputStream(fileInputStream, cipher));
            out = new BufferedOutputStream(new FileOutputStream(encryptionSettings.outputFile));
            processStreams(in, out);
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            closeStream(in);
            closeStream(out);
        }
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

From source file:com.github.flbaue.jcrypttool.v1.EncryptionRunnable.java

License:Apache License

@Override
public void run() {
    progress.start();//from www  . j av a 2s.com

    final byte[] salt = generateSalt();
    final byte[] key = generateKey(encryptionSettings.password, salt);
    final byte[] iv;
    final PaddedBufferedBlockCipher cipher;

    try (OutputStream fileOutputStream = new BufferedOutputStream(
            new FileOutputStream(encryptionSettings.outputFile))) {

        cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), new PKCS7Padding());
        iv = generateIV();
        final KeyParameter keyParam = new KeyParameter(key);
        final CipherParameters params = new ParametersWithIV(keyParam, iv);
        cipher.init(true, params);

        /*
        System.out.println(getClass().getName() + " salt:\t" + Base64.toBase64String(salt) + " (" + salt.length + " byte)");
        System.out.println(getClass().getName() + " key:\t" + Base64.toBase64String(key) + " (" + key.length + " byte)");
        System.out.println(getClass().getName() + " iv:\t\t" + Base64.toBase64String(iv) + " (" + iv.length + " byte)");
        */

        InputStream in = null;
        OutputStream out = null;
        try {
            writeInitBlock(fileOutputStream, salt, iv);
            in = new BufferedInputStream(new FileInputStream(encryptionSettings.inputFile));
            out = new GZIPOutputStream(new CipherOutputStream(fileOutputStream, cipher));
            processStreams(in, out);
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            closeStream(in);
            closeStream(out);
        }
    } catch (IOException e) {
        throw new RuntimeException(e);
    }

    progress.setFinished();
}

From source file:com.github.flbaue.jcrypttool.v2.domain.AesEncryptionService.java

License:Apache License

@Override
public OutputStream encryptedOutputStream(final Path path, final String password)
        throws IOException, EncryptionFailedException {
    try {//from   w w  w .j  a  v a2  s .c  o m
        final byte[] salt = generateSalt();
        final byte[] key = generateKey(password, salt);
        final byte[] iv = generateIV();
        final byte[] fileInitBlock = generateOutputInitBlock(salt, iv);

        final PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
                new CBCBlockCipher(new AESEngine()), new PKCS7Padding());

        final KeyParameter keyParam = new KeyParameter(key);
        final CipherParameters params = new ParametersWithIV(keyParam, iv);
        cipher.init(true, params);

        final BufferedOutputStream out = new BufferedOutputStream(Files.newOutputStream(path));
        out.write(fileInitBlock);

        return new CipherOutputStream(out, cipher);
    } catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
        throw new EncryptionFailedException(e);
    }
}

From source file:com.github.flbaue.jcrypttool.v2.domain.AesEncryptionService.java

License:Apache License

@Override
public String encryptString(final String string, final String password) throws EncryptionFailedException {
    try {//from   w  w  w.  j  a v a 2s .com
        final byte[] salt = generateSalt();
        final byte[] key = generateKey(password, salt);
        final byte[] iv = generateIV();
        final byte[] outputInitBlock = generateOutputInitBlock(salt, iv);

        final PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
                new CBCBlockCipher(new AESEngine()), new PKCS7Padding());

        final KeyParameter keyParam = new KeyParameter(key);
        final CipherParameters params = new ParametersWithIV(keyParam, iv);
        cipher.init(true, params);

        final byte in[] = string.getBytes();
        final byte out[] = new byte[cipher.getOutputSize(in.length)];
        final int len1 = cipher.processBytes(in, 0, in.length, out, 0);

        cipher.doFinal(out, len1);

        final byte[] result = Arrays.concatenate(outputInitBlock, out);

        return Base64.toBase64String(result);
    } catch (InvalidKeySpecException | NoSuchAlgorithmException | InvalidCipherTextException e) {
        throw new EncryptionFailedException(e);
    }
}