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/**
* @test
* @bug 4853305 4865198 4888410
* @summary Verify that the RSA KeyPairGenerator works
* @author Andreas Sterbenz
*/
import java.io.*;
import java.util.*;
import java.math.BigInteger;
import java.security.*;
import java.security.interfaces.*;
import java.security.spec.*;
public class TestKeyPairGenerator {
private static Provider provider;
private static byte[] data;
private static void testSignature(String algorithm, PrivateKey privateKey, PublicKey publicKey) throws Exception {
System.out.println("Testing " + algorithm + "...");
Signature s = Signature.getInstance(algorithm, provider);
s.initSign(privateKey);
s.update(data);
byte[] sig = s.sign();
s.initVerify(publicKey);
s.update(data);
boolean result = s.verify(sig);
if (result == false) {
throw new Exception("Verification failed");
}
}
private static void test(PrivateKey privateKey, PublicKey publicKey) throws Exception {
testSignature("MD2withRSA", privateKey, publicKey);
testSignature("MD5withRSA", privateKey, publicKey);
testSignature("SHA1withRSA", privateKey, publicKey);
testSignature("SHA256withRSA", privateKey, publicKey);
RSAPublicKey rsaKey = (RSAPublicKey)publicKey;
if (rsaKey.getModulus().bitLength() > 512) {
// for SHA384 and SHA512 the data is too long for 512 bit keys
testSignature("SHA384withRSA", privateKey, publicKey);
testSignature("SHA512withRSA", privateKey, publicKey);
}
}
// regression test for 4865198
private static void testInvalidSignature(KeyPair kp1, KeyPair kp2) throws Exception {
System.out.println("Testing signature with incorrect key...");
Signature sig = Signature.getInstance("MD5withRSA", provider);
sig.initSign(kp1.getPrivate());
byte[] data = new byte[100];
sig.update(data);
byte[] signature = sig.sign();
sig.initVerify(kp1.getPublic());
sig.update(data);
if (sig.verify(signature) == false) {
throw new Exception("verification failed");
}
sig.initVerify(kp2.getPublic());
sig.update(data);
// verify needs to return false and not throw an Exception
try {
if (sig.verify(signature)) {
throw new Exception("verification unexpectedly succeeded");
}
} catch (SignatureException se) {
// Yet another kind of failure, OK.
}
}
public static void main(String[] args) throws Exception {
long start = System.currentTimeMillis();
provider = Security.getProvider("SunRsaSign");
data = new byte[2048];
// keypair generation is very slow, test only a few short keys
int[] keyLengths = {512, 512, 1024};
BigInteger[] pubExps = {null, BigInteger.valueOf(3), null};
KeyPair[] keyPairs = new KeyPair[3];
new Random().nextBytes(data);
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA", provider);
for (int i = 0; i < keyLengths.length; i++) {
int len = keyLengths[i];
BigInteger exp = pubExps[i];
System.out.println("Generating " + len + " bit keypair...");
if (exp == null) {
kpg.initialize(len);
} else {
kpg.initialize(new RSAKeyGenParameterSpec(len, exp));
}
KeyPair kp = kpg.generateKeyPair();
keyPairs[i] = kp;
RSAPublicKey publicKey = (RSAPublicKey)kp.getPublic();
System.out.println(publicKey);
RSAPrivateCrtKey privateKey = (RSAPrivateCrtKey)kp.getPrivate();
if (publicKey.getModulus().equals(privateKey.getModulus()) == false) {
throw new Exception("Moduli do not match");
}
if (publicKey.getPublicExponent().equals(privateKey.getPublicExponent()) == false) {
throw new Exception("Exponents do not match");
}
int keyLen = publicKey.getModulus().bitLength();
if ((keyLen > len) || (keyLen < len - 1)) {
throw new Exception("Incorrect key length: " + keyLen);
}
if (exp != null) {
if (exp.equals(publicKey.getPublicExponent()) == false) {
throw new Exception("Incorrect exponent");
}
}
test(privateKey, publicKey);
}
testInvalidSignature(keyPairs[0], keyPairs[1]);
testInvalidSignature(keyPairs[0], keyPairs[2]);
testInvalidSignature(keyPairs[2], keyPairs[0]);
long stop = System.currentTimeMillis();
System.out.println("All tests passed (" + (stop - start) + " ms).");
}
}