1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package tests.security;
18
19import java.security.InvalidKeyException;
20import java.security.KeyPair;
21import java.security.NoSuchAlgorithmException;
22import java.security.PrivateKey;
23import java.security.PublicKey;
24import java.security.Signature;
25import java.security.SignatureException;
26import junit.framework.Assert;
27
28public class SignatureHelper extends TestHelper<KeyPair> {
29
30    private final String algorithmName;
31    private final String plainData = "some data do sign and verify";
32
33    public SignatureHelper(String algorithmName) {
34        this.algorithmName = algorithmName;
35    }
36
37    @Override
38    public void test(KeyPair keyPair) {
39        test(keyPair.getPrivate(), keyPair.getPublic());
40    }
41
42    public void test(PrivateKey encryptKey, PublicKey decryptKey) {
43
44        Signature signature = null;
45        try {
46            signature = Signature.getInstance(algorithmName);
47        } catch (NoSuchAlgorithmException e) {
48            Assert.fail(e.getMessage());
49        }
50
51        try {
52            signature.initSign(encryptKey);
53        } catch (InvalidKeyException e) {
54            Assert.fail(e.getMessage());
55        }
56
57        try {
58            signature.update(plainData.getBytes());
59        } catch (SignatureException e) {
60            Assert.fail(e.getMessage());
61        }
62
63        byte[] signed = null;
64        try {
65            signed = signature.sign();
66        } catch (SignatureException e) {
67            Assert.fail(e.getMessage());
68        }
69
70        try {
71            signature.initVerify(decryptKey);
72        } catch (InvalidKeyException e) {
73            Assert.fail(e.getMessage());
74        }
75
76        try {
77            signature.update(plainData.getBytes());
78        } catch (SignatureException e) {
79            Assert.fail(e.getMessage());
80        }
81
82        try {
83            Assert.assertTrue("signature could not be verified", signature
84                    .verify(signed));
85        } catch (SignatureException e) {
86            Assert.fail(e.getMessage());
87        }
88    }
89}
90