Examples with PaddedBufferedBlockCipher org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher used on opensource projects

Example 11 with PaddedBufferedBlockCipher

use of org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher in project gocd by gocd.

the class DESEncrypter method decrypt.

private static String decrypt(byte[] key, String cipherText) throws CryptoException {
    try {
        PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new DESEngine()));
        cipher.init(false, new KeyParameter(key));
        byte[] cipherTextBytes = DECODER.decode(cipherText);
        byte[] plainTextBytes = new byte[cipher.getOutputSize(cipherTextBytes.length)];
        int outputLength = cipher.processBytes(cipherTextBytes, 0, cipherTextBytes.length, plainTextBytes, 0);
        cipher.doFinal(plainTextBytes, outputLength);
        int paddingStarts = plainTextBytes.length - 1;
        for (; paddingStarts >= 0; paddingStarts--) {
            if (plainTextBytes[paddingStarts] != 0) {
                break;
            }
        }
        return new String(plainTextBytes, 0, paddingStarts + 1);
    } catch (Exception e) {
        throw new CryptoException(e);
    }
}

Example 12 with PaddedBufferedBlockCipher

use of org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher in project gocd by gocd.

the class GoCipher method cipher.

public String cipher(byte[] key, String plainText) throws InvalidCipherTextException {
    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new DESEngine()));
    KeyParameter keyParameter = new KeyParameter(Hex.decode(key));
    cipher.init(true, keyParameter);
    byte[] plainTextBytes = plainText.getBytes();
    byte[] cipherTextBytes = new byte[cipher.getOutputSize(plainTextBytes.length)];
    int outputLength = cipher.processBytes(plainTextBytes, 0, plainTextBytes.length, cipherTextBytes, 0);
    cipher.doFinal(cipherTextBytes, outputLength);
    return java.util.Base64.getEncoder().encodeToString(cipherTextBytes).trim();
}

Example 13 with PaddedBufferedBlockCipher

use of org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher 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 14 with PaddedBufferedBlockCipher

use of org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher 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;
}

Example 15 with PaddedBufferedBlockCipher

use of org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher in project photon-model by vmware.

the class EncryptorService method getCipher.

/*
     * Cipher settings
     */
private BufferedBlockCipher getCipher(boolean forEncryption) {
    BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), new PKCS7Padding());
    cipher.init(forEncryption, new ParametersWithIV(new KeyParameter(this.keyBytes, IV_LENGTH, this.keyBytes.length - IV_LENGTH), this.keyBytes, 0, IV_LENGTH));
    return cipher;
}