CryptoTest.java

/*
 * Copyright 2014-2015 the original author or authors.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package de.schildbach.wallet.util;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import org.bitcoinj.wallet.WalletProtobufSerializer;
import org.junit.Test;

import com.google.common.base.Charsets;

/**
 * @author Andreas Schildbach
 */
public class CryptoTest {
    private static final String PLAIN_TEXT = "plain text";
    private static final byte[] PLAIN_BYTES = PLAIN_TEXT.getBytes();
    private static final char[] PASSWORD = "password".toCharArray();

    @Test
    public void roundtripText() throws Exception {
        final String plainText = Crypto.decrypt(Crypto.encrypt(PLAIN_TEXT, PASSWORD), PASSWORD);
        assertEquals(PLAIN_TEXT, plainText);
    }

    @Test
    public void roundtripDifferentTextSizes() throws Exception {
        final StringBuilder builder = new StringBuilder();
        while (builder.length() < 4096) {
            final String plainText = builder.toString();
            final String roundtrippedPlainText = Crypto.decrypt(Crypto.encrypt(plainText, PASSWORD), PASSWORD);
            assertEquals(plainText, roundtrippedPlainText);

            builder.append('x');
        }
    }

    @Test
    public void roundtripBytes() throws Exception {
        final byte[] plainBytes = Crypto.decryptBytes(Crypto.encrypt(PLAIN_BYTES, PASSWORD), PASSWORD);
        assertArrayEquals(PLAIN_BYTES, plainBytes);
    }

    @Test
    public void roundtripDifferentByteSizes() throws Exception {
        final ByteArrayOutputStream stream = new ByteArrayOutputStream(4096);
        while (stream.toByteArray().length < 4096) {
            final byte[] plainBytes = stream.toByteArray();
            final byte[] roundtrippedPlainBytes = Crypto.decryptBytes(Crypto.encrypt(plainBytes, PASSWORD), PASSWORD);
            assertArrayEquals(plainBytes, roundtrippedPlainBytes);

            stream.write(42);
        }
    }

    @Test
    public void roundtripDifferentPasswordSizes() throws Exception {
        final StringBuilder builder = new StringBuilder();
        while (builder.length() < 4096) {
            final char[] password = builder.toString().toCharArray();
            final String plainText = Crypto.decrypt(Crypto.encrypt(PLAIN_TEXT, password), password);
            assertEquals(PLAIN_TEXT, plainText);

            builder.append('x');
        }
    }

    @Test
    public void backups() throws Exception {
        final byte[] backup = Crypto.decryptBytes(readBackupFromResource("bitcoin-wallet-backup-testnet-3.50"),
                PASSWORD);
        assertTrue(WalletProtobufSerializer.isWallet(new ByteArrayInputStream(backup)));

        final byte[] backupCrLf = Crypto.decryptBytes(readBackupFromResource("bitcoin-wallet-backup-testnet-3.50-crlf"),
                PASSWORD);
        assertTrue(WalletProtobufSerializer.isWallet(new ByteArrayInputStream(backupCrLf)));
    }

    private String readBackupFromResource(final String filename) throws IOException {
        final BufferedReader reader = new BufferedReader(
                new InputStreamReader(getClass().getResourceAsStream(filename), Charsets.UTF_8));
        final StringBuilder backup = new StringBuilder();
        Io.copy(reader, backup);
        reader.close();

        return backup.toString();
    }
}