Examples with OFBBlockCipher org.bouncycastle.crypto.modes.OFBBlockCipher used on opensource projects

Example 6 with OFBBlockCipher

use of org.bouncycastle.crypto.modes.OFBBlockCipher in project samourai-wallet-android by Samourai-Wallet.

the class AESUtil method encryptWithSetMode.

public static String encryptWithSetMode(String cleartext, CharSequenceX password, int iterations, int mode, @Nullable BlockCipherPadding padding) throws DecryptionException, UnsupportedEncodingException {
    final int AESBlockSize = 4;
    if (password == null) {
        throw new DecryptionException("Password null");
    }
    // Use secure random to generate a 16 byte iv
    SecureRandom random = new SecureRandom();
    byte[] iv = new byte[AESBlockSize * 4];
    random.nextBytes(iv);
    byte[] clearbytes = cleartext.getBytes("UTF-8");
    PBEParametersGenerator generator = new PKCS5S2ParametersGenerator();
    generator.init(PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(password.toString().toCharArray()), iv, iterations);
    KeyParameter keyParam = (KeyParameter) generator.generateDerivedParameters(256);
    CipherParameters params = new ParametersWithIV(keyParam, iv);
    BlockCipher cipherMode;
    if (mode == MODE_CBC) {
        cipherMode = new CBCBlockCipher(new AESEngine());
    } else {
        // mode == MODE_OFB
        cipherMode = new OFBBlockCipher(new AESEngine(), 128);
    }
    BufferedBlockCipher cipher;
    if (padding != null) {
        cipher = new PaddedBufferedBlockCipher(cipherMode, padding);
    } else {
        cipher = new BufferedBlockCipher(cipherMode);
    }
    cipher.reset();
    cipher.init(true, params);
    byte[] outBuf = cipherData(cipher, clearbytes);
    // Append to IV to the output
    int len1 = iv.length;
    int len2 = outBuf.length;
    byte[] ivAppended = new byte[len1 + len2];
    System.arraycopy(iv, 0, ivAppended, 0, len1);
    System.arraycopy(outBuf, 0, ivAppended, len1, len2);
    // String ret = Base64.encodeBase64String(ivAppended);
    byte[] raw = Base64.encodeBase64(ivAppended);
    return new String(raw);
}