Java Examples for org.spongycastle.crypto.Digest

public void engineLoad(InputStream stream, char[] password) throws IOException {
    table.clear();
    if (// just initialising
    stream == null) {
        return;
    }
    DataInputStream dIn = new DataInputStream(stream);
    int version = dIn.readInt();
    if (version != STORE_VERSION) {
        if (version != 0 && version != 1) {
            throw new IOException("Wrong version of key store.");
        }
    }
    byte[] salt = new byte[dIn.readInt()];
    if (salt.length != STORE_SALT_SIZE) {
        throw new IOException("Key store corrupted.");
    }
    dIn.readFully(salt);
    int iterationCount = dIn.readInt();
    if ((iterationCount < 0) || (iterationCount > 4 * MIN_ITERATIONS)) {
        throw new IOException("Key store corrupted.");
    }
    String cipherAlg;
    if (version == 0) {
        cipherAlg = "Old" + STORE_CIPHER;
    } else {
        cipherAlg = STORE_CIPHER;
    }
    Cipher cipher = this.makePBECipher(cipherAlg, Cipher.DECRYPT_MODE, password, salt, iterationCount);
    CipherInputStream cIn = new CipherInputStream(dIn, cipher);
    Digest dig = new SHA1Digest();
    DigestInputStream dgIn = new DigestInputStream(cIn, dig);
    this.loadStore(dgIn);
    // Finalise our digest calculation
    byte[] hash = new byte[dig.getDigestSize()];
    dig.doFinal(hash, 0);
    // TODO Should this actually be reading the remainder of the stream?
    // Read the original digest from the stream
    byte[] oldHash = new byte[dig.getDigestSize()];
    Streams.readFully(cIn, oldHash);
    if (!Arrays.constantTimeAreEqual(hash, oldHash)) {
        table.clear();
        throw new IOException("KeyStore integrity check failed.");
    }
}

public static String encryptRsaOaep(String plaintext, String keyAlias) {
    try {
        AndroidRsaEngine rsa = new AndroidRsaEngine(keyAlias, false);
        Digest digest = new SHA512Digest();
        Digest mgf1digest = new SHA512Digest();
        OAEPEncoding oaep = new OAEPEncoding(rsa, digest, mgf1digest, null);
        oaep.init(true, null);
        byte[] plainBytes = plaintext.getBytes("UTF-8");
        byte[] cipherText = oaep.processBlock(plainBytes, 0, plainBytes.length);
        return toBase64(cipherText);
    } catch (UnsupportedEncodingException e) {
        throw new RuntimeException(e);
    } catch (InvalidCipherTextException e) {
        throw new RuntimeException(e);
    }
}

public Digest getDigest() {
    return this.digest;
}