Source Code Cross Referenced for ElGamalTest.java in  » Security » Bouncy-Castle » org » bouncycastle » jce » provider » test » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Security » Bouncy Castle » org.bouncycastle.jce.provider.test 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.bouncycastle.jce.provider.test;
002:
003:        import org.bouncycastle.jce.provider.BouncyCastleProvider;
004:        import org.bouncycastle.util.encoders.Hex;
005:        import org.bouncycastle.util.test.SimpleTest;
006:
007:        import javax.crypto.Cipher;
008:        import javax.crypto.interfaces.DHPrivateKey;
009:        import javax.crypto.interfaces.DHPublicKey;
010:        import javax.crypto.spec.DHParameterSpec;
011:        import java.io.ByteArrayInputStream;
012:        import java.io.ByteArrayOutputStream;
013:        import java.io.ObjectInputStream;
014:        import java.io.ObjectOutputStream;
015:        import java.math.BigInteger;
016:        import java.security.AlgorithmParameterGenerator;
017:        import java.security.AlgorithmParameters;
018:        import java.security.KeyFactory;
019:        import java.security.KeyPair;
020:        import java.security.KeyPairGenerator;
021:        import java.security.SecureRandom;
022:        import java.security.Security;
023:        import java.security.spec.PKCS8EncodedKeySpec;
024:        import java.security.spec.X509EncodedKeySpec;
025:
026:        public class ElGamalTest extends SimpleTest {
027:            private BigInteger g512 = new BigInteger(
028:                    "153d5d6172adb43045b68ae8e1de1070b6137005686d29d3d73a7749199681ee5b212c9b96bfdcfa5b20cd5e3fd2044895d609cf9b410b7a0f12ca1cb9a428cc",
029:                    16);
030:            private BigInteger p512 = new BigInteger(
031:                    "9494fec095f3b85ee286542b3836fc81a5dd0a0349b4c239dd38744d488cf8e31db8bcb7d33b41abb9e5a33cca9144b1cef332c94bf0573bf047a3aca98cdf3b",
032:                    16);
033:
034:            private BigInteger g768 = new BigInteger(
035:                    "7c240073c1316c621df461b71ebb0cdcc90a6e5527e5e126633d131f87461c4dc4afc60c2cb0f053b6758871489a69613e2a8b4c8acde23954c08c81cbd36132cfd64d69e4ed9f8e51ed6e516297206672d5c0a69135df0a5dcf010d289a9ca1",
036:                    16);
037:            private BigInteger p768 = new BigInteger(
038:                    "8c9dd223debed1b80103b8b309715be009d48860ed5ae9b9d5d8159508efd802e3ad4501a7f7e1cfec78844489148cd72da24b21eddd01aa624291c48393e277cfc529e37075eccef957f3616f962d15b44aeab4039d01b817fde9eaa12fd73f",
039:                    16);
040:
041:            private BigInteger g1024 = new BigInteger(
042:                    "1db17639cdf96bc4eabba19454f0b7e5bd4e14862889a725c96eb61048dcd676ceb303d586e30f060dbafd8a571a39c4d823982117da5cc4e0f89c77388b7a08896362429b94a18a327604eb7ff227bffbc83459ade299e57b5f77b50fb045250934938efa145511166e3197373e1b5b1e52de713eb49792bedde722c6717abf",
043:                    16);
044:            private BigInteger p1024 = new BigInteger(
045:                    "a00e283b3c624e5b2b4d9fbc2653b5185d99499b00fd1bf244c6f0bb817b4d1c451b2958d62a0f8a38caef059fb5ecd25d75ed9af403f5b5bdab97a642902f824e3c13789fed95fa106ddfe0ff4a707c85e2eb77d49e68f2808bcea18ce128b178cd287c6bc00efa9a1ad2a673fe0dceace53166f75b81d6709d5f8af7c66bb7",
046:                    16);
047:
048:            public String getName() {
049:                return "ElGamal";
050:            }
051:
052:            private void testGP(int size, int privateValueSize, BigInteger g,
053:                    BigInteger p) throws Exception {
054:                DHParameterSpec elParams = new DHParameterSpec(p, g,
055:                        privateValueSize);
056:                KeyPairGenerator keyGen = KeyPairGenerator.getInstance(
057:                        "ElGamal", "BC");
058:                byte[] in = "This is a test".getBytes();
059:
060:                keyGen.initialize(elParams);
061:
062:                KeyPair keyPair = keyGen.generateKeyPair();
063:                SecureRandom rand = new SecureRandom();
064:
065:                checkKeySize(privateValueSize, keyPair);
066:
067:                Cipher cipher = Cipher.getInstance("ElGamal", "BC");
068:
069:                cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
070:
071:                if (cipher.getOutputSize(in.length) != (size / 8) * 2) {
072:                    fail("getOutputSize wrong on encryption");
073:                }
074:
075:                byte[] out = cipher.doFinal(in);
076:
077:                cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
078:
079:                if (cipher.getOutputSize(out.length) != (size / 8) - 1) {
080:                    fail("getOutputSize wrong on decryption");
081:                }
082:
083:                //
084:                // No Padding - maximum length
085:                //
086:                byte[] modBytes = ((DHPublicKey) keyPair.getPublic())
087:                        .getParams().getP().toByteArray();
088:                byte[] maxInput = new byte[modBytes.length - 1];
089:
090:                maxInput[0] |= 0x7f;
091:
092:                cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
093:
094:                out = cipher.doFinal(maxInput);
095:
096:                cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
097:
098:                out = cipher.doFinal(out);
099:
100:                if (!areEqual(out, maxInput)) {
101:                    fail("NoPadding test failed on decrypt expected "
102:                            + new String(Hex.encode(maxInput)) + " got "
103:                            + new String(Hex.encode(out)));
104:                }
105:
106:                //
107:                // encrypt/decrypt
108:                //
109:
110:                Cipher c1 = Cipher.getInstance("ElGamal", "BC");
111:                Cipher c2 = Cipher.getInstance("ElGamal", "BC");
112:
113:                c1.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
114:
115:                byte[] out1 = c1.doFinal(in);
116:
117:                c2.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
118:
119:                byte[] out2 = c2.doFinal(out1);
120:
121:                if (!areEqual(in, out2)) {
122:                    fail(size + " encrypt test failed");
123:                }
124:
125:                //
126:                // encrypt/decrypt with update
127:                //
128:                int outLen = c1.update(in, 0, 2, out1, 0);
129:
130:                outLen += c1.doFinal(in, 2, in.length - 2, out1, outLen);
131:
132:                outLen = c2.update(out1, 0, 2, out2, 0);
133:
134:                outLen += c2.doFinal(out1, 2, out1.length - 2, out2, outLen);
135:
136:                if (!areEqual(in, out2)) {
137:                    fail(size + " encrypt with update test failed");
138:                }
139:
140:                //
141:                // public key encoding test
142:                //
143:                byte[] pubEnc = keyPair.getPublic().getEncoded();
144:                KeyFactory keyFac = KeyFactory.getInstance("ElGamal", "BC");
145:                X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(pubEnc);
146:                DHPublicKey pubKey = (DHPublicKey) keyFac
147:                        .generatePublic(pubX509);
148:                DHParameterSpec spec = pubKey.getParams();
149:
150:                if (!spec.getG().equals(elParams.getG())
151:                        || !spec.getP().equals(elParams.getP())) {
152:                    fail(size
153:                            + " bit public key encoding/decoding test failed on parameters");
154:                }
155:
156:                if (!((DHPublicKey) keyPair.getPublic()).getY().equals(
157:                        pubKey.getY())) {
158:                    fail(size
159:                            + " bit public key encoding/decoding test failed on y value");
160:                }
161:
162:                //
163:                // public key serialisation test
164:                //
165:                ByteArrayOutputStream bOut = new ByteArrayOutputStream();
166:                ObjectOutputStream oOut = new ObjectOutputStream(bOut);
167:
168:                oOut.writeObject(keyPair.getPublic());
169:
170:                ByteArrayInputStream bIn = new ByteArrayInputStream(bOut
171:                        .toByteArray());
172:                ObjectInputStream oIn = new ObjectInputStream(bIn);
173:
174:                pubKey = (DHPublicKey) oIn.readObject();
175:                spec = pubKey.getParams();
176:
177:                if (!spec.getG().equals(elParams.getG())
178:                        || !spec.getP().equals(elParams.getP())) {
179:                    fail(size
180:                            + " bit public key serialisation test failed on parameters");
181:                }
182:
183:                if (!((DHPublicKey) keyPair.getPublic()).getY().equals(
184:                        pubKey.getY())) {
185:                    fail(size
186:                            + " bit public key serialisation test failed on y value");
187:                }
188:
189:                //
190:                // private key encoding test
191:                //
192:                byte[] privEnc = keyPair.getPrivate().getEncoded();
193:                PKCS8EncodedKeySpec privPKCS8 = new PKCS8EncodedKeySpec(privEnc);
194:                DHPrivateKey privKey = (DHPrivateKey) keyFac
195:                        .generatePrivate(privPKCS8);
196:
197:                spec = privKey.getParams();
198:
199:                if (!spec.getG().equals(elParams.getG())
200:                        || !spec.getP().equals(elParams.getP())) {
201:                    fail(size
202:                            + " bit private key encoding/decoding test failed on parameters");
203:                }
204:
205:                if (!((DHPrivateKey) keyPair.getPrivate()).getX().equals(
206:                        privKey.getX())) {
207:                    fail(size
208:                            + " bit private key encoding/decoding test failed on y value");
209:                }
210:
211:                //
212:                // private key serialisation test
213:                //
214:                bOut = new ByteArrayOutputStream();
215:                oOut = new ObjectOutputStream(bOut);
216:
217:                oOut.writeObject(keyPair.getPrivate());
218:
219:                bIn = new ByteArrayInputStream(bOut.toByteArray());
220:                oIn = new ObjectInputStream(bIn);
221:
222:                privKey = (DHPrivateKey) oIn.readObject();
223:                spec = privKey.getParams();
224:
225:                if (!spec.getG().equals(elParams.getG())
226:                        || !spec.getP().equals(elParams.getP())) {
227:                    fail(size
228:                            + " bit private key serialisation test failed on parameters");
229:                }
230:
231:                if (!((DHPrivateKey) keyPair.getPrivate()).getX().equals(
232:                        privKey.getX())) {
233:                    fail(size
234:                            + " bit private key serialisation test failed on y value");
235:                }
236:            }
237:
238:            private void checkKeySize(int privateValueSize, KeyPair aKeyPair) {
239:                if (privateValueSize != 0) {
240:                    DHPrivateKey key = (DHPrivateKey) aKeyPair.getPrivate();
241:
242:                    if (key.getX().bitLength() != privateValueSize) {
243:                        fail("limited key check failed for key size "
244:                                + privateValueSize);
245:                    }
246:                }
247:            }
248:
249:            private void testRandom(int size) throws Exception {
250:                AlgorithmParameterGenerator a = AlgorithmParameterGenerator
251:                        .getInstance("ElGamal", "BC");
252:                a.init(size, new SecureRandom());
253:                AlgorithmParameters params = a.generateParameters();
254:
255:                byte[] encodeParams = params.getEncoded();
256:
257:                AlgorithmParameters a2 = AlgorithmParameters.getInstance(
258:                        "ElGamal", "BC");
259:                a2.init(encodeParams);
260:
261:                // a and a2 should be equivalent!
262:                byte[] encodeParams_2 = a2.getEncoded();
263:
264:                if (!areEqual(encodeParams, encodeParams_2)) {
265:                    fail(this .getName() + ": encode/decode parameters failed");
266:                }
267:
268:                DHParameterSpec elP = (DHParameterSpec) params
269:                        .getParameterSpec(DHParameterSpec.class);
270:
271:                testGP(size, 0, elP.getG(), elP.getP());
272:            }
273:
274:            public void performTest() throws Exception {
275:                testGP(512, 0, g512, p512);
276:                testGP(768, 0, g768, p768);
277:                testGP(1024, 0, g1024, p1024);
278:
279:                testGP(512, 64, g512, p512);
280:                testGP(768, 128, g768, p768);
281:                testGP(1024, 256, g1024, p1024);
282:
283:                testRandom(256);
284:            }
285:
286:            public static void main(String[] args) {
287:                Security.addProvider(new BouncyCastleProvider());
288:
289:                runTest(new ElGamalTest());
290:            }
291:        }
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