Examples with AESEngine org.bouncycastle.crypto.engines.AESEngine used on opensource projects

Example 16 with AESEngine

use of org.bouncycastle.crypto.engines.AESEngine in project inbot-utils by Inbot.

the class AESUtils method encryptBouncyCastle.

private static String encryptBouncyCastle(SecretKey secret, String plainText) {
    try {
        // prepending with md5 hash allows us to do an integrity check on decrypt to prevent returning garbage if the decrypt key is incorrect
        String md5 = HashUtils.md5(plainText);
        plainText = md5 + plainText;
        // the iv acts as a per use salt, this ensures things encrypted with the same key always have a unique salt
        // 128 bit iv because NIST AES is standardized with 128 bit blocks and iv needs to match block size, even when using 256 bit key
        byte[] iv = new byte[16];
        SECURE_RANDOM.nextBytes(iv);
        // setup cipher parameters with key and IV
        byte[] key = secret.getEncoded();
        // setup AES cipher in CBC mode with PKCS7 padding
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), new PKCS7Padding());
        cipher.reset();
        cipher.init(true, new ParametersWithIV(new KeyParameter(key), iv));
        byte[] plainTextBuf = plainText.getBytes(StandardCharsets.UTF_8);
        byte[] buf = new byte[cipher.getOutputSize(plainTextBuf.length)];
        int len = cipher.processBytes(plainTextBuf, 0, plainTextBuf.length, buf, 0);
        len += cipher.doFinal(buf, len);
        // copy the encrypted part of the buffer to out
        byte[] out = new byte[len];
        System.arraycopy(buf, 0, out, 0, len);
        // iv$encrypted
        return byteArrayToHexString(iv) + "$" + new String(Base64.encodeBase64URLSafe(out), StandardCharsets.UTF_8);
    } catch (DataLengthException | InvalidCipherTextException e) {
        throw new IllegalStateException("cannot encrypt", e);
    }
}

Example 17 with AESEngine

use of org.bouncycastle.crypto.engines.AESEngine in project nem2-sdk-java by nemtech.

the class Ed25519BlockCipher method setupBlockCipher.

private BufferedBlockCipher setupBlockCipher(final byte[] sharedKey, final byte[] ivData, final boolean forEncryption) {
    // Setup cipher parameters with key and IV.
    final KeyParameter keyParam = new KeyParameter(sharedKey);
    final CipherParameters params = new ParametersWithIV(keyParam, ivData);
    // Setup AES cipher in CBC mode with PKCS7 padding.
    final BlockCipherPadding padding = new PKCS7Padding();
    final BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), padding);
    cipher.reset();
    cipher.init(forEncryption, params);
    return cipher;
}