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*
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* version 2 for more details (a copy is included in the LICENSE file that
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*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
/*
* @test
* @bug 0000000
* @summary DHKeyAgreement2
* @author Jan Luehe
*/
import java.io.*;
import java.math.BigInteger;
import java.security.*;
import java.security.spec.*;
import java.security.interfaces.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import javax.crypto.interfaces.*;
import com.sun.crypto.provider.SunJCE;
import sun.misc.HexDumpEncoder;
/**
* This test utility executes the Diffie-Hellman key agreement protocol
* between 2 parties: Alice and Bob.
*
* By default, preconfigured parameters (1024 bit prime modulus and base
* generator used by SKIP) are used.
* If this program is called with the "-gen" option, a new set of parameters
* are created.
*/
public class DHKeyAgreement2 {
private DHKeyAgreement2() {}
public static void main(String argv[]) throws Exception {
String mode = "USE_SKIP_DH_PARAMS";
// Add JCE to the list of providers
SunJCE jce = new SunJCE();
Security.addProvider(jce);
DHKeyAgreement2 keyAgree = new DHKeyAgreement2();
if (argv.length > 1) {
keyAgree.usage();
throw new Exception("Wrong number of command options");
} else if (argv.length == 1) {
if (!(argv[0].equals("-gen"))) {
keyAgree.usage();
throw new Exception("Unrecognized flag: " + argv[0]);
}
mode = "GENERATE_DH_PARAMS";
}
keyAgree.run(mode);
System.out.println("Test Passed");
}
private void run(String mode) throws Exception {
DHParameterSpec dhSkipParamSpec;
if (mode.equals("GENERATE_DH_PARAMS")) {
// Some central authority creates new DH parameters
System.err.println("Creating Diffie-Hellman parameters ...");
AlgorithmParameterGenerator paramGen
= AlgorithmParameterGenerator.getInstance("DH");
paramGen.init(512);
AlgorithmParameters params = paramGen.generateParameters();
dhSkipParamSpec = (DHParameterSpec)params.getParameterSpec
(DHParameterSpec.class);
} else {
// use some pre-generated, default DH parameters
System.err.println("Using SKIP Diffie-Hellman parameters");
dhSkipParamSpec = new DHParameterSpec(skip1024Modulus,
skip1024Base);
}
/*
* Alice creates her own DH key pair, using the DH parameters from
* above
*/
System.err.println("ALICE: Generate DH keypair ...");
KeyPairGenerator aliceKpairGen = KeyPairGenerator.getInstance("DH");
aliceKpairGen.initialize(dhSkipParamSpec);
KeyPair aliceKpair = aliceKpairGen.generateKeyPair();
System.out.println("Alice DH public key:\n" +
aliceKpair.getPublic().toString());
System.out.println("Alice DH private key:\n" +
aliceKpair.getPrivate().toString());
DHParameterSpec dhParamSpec =
((DHPublicKey)aliceKpair.getPublic()).getParams();
AlgorithmParameters algParams = AlgorithmParameters.getInstance("DH");
algParams.init(dhParamSpec);
System.out.println("Alice DH parameters:\n"
+ algParams.toString());
// Alice executes Phase1 of her version of the DH protocol
System.err.println("ALICE: Execute PHASE1 ...");
KeyAgreement aliceKeyAgree = KeyAgreement.getInstance("DH");
aliceKeyAgree.init(aliceKpair.getPrivate());
// Alice encodes her public key, and sends it over to Bob.
byte[] alicePubKeyEnc = aliceKpair.getPublic().getEncoded();
/*
* Let's turn over to Bob. Bob has received Alice's public key
* in encoded format.
* He instantiates a DH public key from the encoded key material.
*/
KeyFactory bobKeyFac = KeyFactory.getInstance("DH");
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec
(alicePubKeyEnc);
PublicKey alicePubKey = bobKeyFac.generatePublic(x509KeySpec);
/*
* Bob gets the DH parameters associated with Alice's public key.
* He must use the same parameters when he generates his own key
* pair.
*/
dhParamSpec = ((DHPublicKey)alicePubKey).getParams();
// Bob creates his own DH key pair
System.err.println("BOB: Generate DH keypair ...");
KeyPairGenerator bobKpairGen = KeyPairGenerator.getInstance("DH");
bobKpairGen.initialize(dhParamSpec);
KeyPair bobKpair = bobKpairGen.generateKeyPair();
System.out.println("Bob DH public key:\n" +
bobKpair.getPublic().toString());
System.out.println("Bob DH private key:\n" +
bobKpair.getPrivate().toString());
// Bob executes Phase1 of his version of the DH protocol
System.err.println("BOB: Execute PHASE1 ...");
KeyAgreement bobKeyAgree = KeyAgreement.getInstance("DH");
bobKeyAgree.init(bobKpair.getPrivate());
// Bob encodes his public key, and sends it over to Alice.
byte[] bobPubKeyEnc = bobKpair.getPublic().getEncoded();
/*
* Alice uses Bob's public key for Phase2 of her version of the DH
* protocol.
* Before she can do so, she has to instanticate a DH public key
* from Bob's encoded key material.
*/
KeyFactory aliceKeyFac = KeyFactory.getInstance("DH");
x509KeySpec = new X509EncodedKeySpec(bobPubKeyEnc);
PublicKey bobPubKey = aliceKeyFac.generatePublic(x509KeySpec);
System.err.println("ALICE: Execute PHASE2 ...");
aliceKeyAgree.doPhase(bobPubKey, true);
/*
* Bob uses Alice's public key for Phase2 of his version of the DH
* protocol.
*/
System.err.println("BOB: Execute PHASE2 ...");
bobKeyAgree.doPhase(alicePubKey, true);
/*
* At this stage, both Alice and Bob have completed the DH key
* agreement protocol.
* Each generates the (same) shared secret.
*/
byte[] aliceSharedSecret = aliceKeyAgree.generateSecret();
int aliceLen = aliceSharedSecret.length;
byte[] bobSharedSecret = new byte[aliceLen];
int bobLen;
try {
// provide output buffer that is too short
bobLen = bobKeyAgree.generateSecret(bobSharedSecret, 1);
/*
* Gatekeeper's note:
* We should not be getting here, but every so often, we
* get a failure, either a "ShortBufferException" or
* "Key agreement has not been completed yet" in the
* generateSecret(bobSharedSecret, 0) below.
*
* This will help to figure out why we're dropping through
* and not failing.
*/
System.out.println("NIGHTLY: Should *NOT* be here!!!\n" +
"aliceLen = " + aliceLen + "\n" +
"Alice's shared secret");
try {
HexDumpEncoder hd = new HexDumpEncoder();
hd.encodeBuffer(
new ByteArrayInputStream(aliceSharedSecret), System.out);
} catch (IOException e) { }
System.out.println("bobLen = " + bobLen);
try {
HexDumpEncoder hd = new HexDumpEncoder();
hd.encodeBuffer(
new ByteArrayInputStream(bobSharedSecret), System.out);
} catch (IOException e) { }
throw new Exception("Shouldn't be succeeding.");
} catch (ShortBufferException e) {
System.out.println("EXPECTED: " + e.getMessage());
}
// provide output buffer of required size
bobLen = bobKeyAgree.generateSecret(bobSharedSecret, 0);
System.out.println("Alice secret: " + toHexString(aliceSharedSecret));
System.out.println("Bob secret: " + toHexString(bobSharedSecret));
if (aliceLen != bobLen) {
throw new Exception("Shared secrets have different lengths");
}
for (int i=0; i<aliceLen; i++) {
if (aliceSharedSecret[i] != bobSharedSecret[i]) {
throw new Exception("Shared secrets differ");
}
}
System.err.println("Shared secrets are the same");
// Now let's return the shared secret as a SecretKey object
// and use it for encryption
System.out.println("Return shared secret as SecretKey object ...");
bobKeyAgree.doPhase(alicePubKey, true);
SecretKey desKey = bobKeyAgree.generateSecret("DES");
Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
desCipher.init(Cipher.ENCRYPT_MODE, desKey);
byte[] cleartext = "This is just an example".getBytes();
byte[] ciphertext = desCipher.doFinal(cleartext);
desCipher.init(Cipher.DECRYPT_MODE, desKey);
byte[] cleartext1 = desCipher.doFinal(ciphertext);
int clearLen = cleartext.length;
int clear1Len = cleartext1.length;
if (clearLen != clear1Len) {
throw new Exception("DIFFERENT");
}
for (int i=0; i < clear1Len; i++) {
if (cleartext[i] != cleartext1[i]) {
throw new Exception("DIFFERENT");
}
}
System.err.println("SAME");
}
/*
* Converts a byte to hex digit and writes to the supplied buffer
*/
private void byte2hex(byte b, StringBuffer buf) {
char[] hexChars = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', 'A', 'B', 'C', 'D', 'E', 'F' };
int high = ((b & 0xf0) >> 4);
int low = (b & 0x0f);
buf.append(hexChars[high]);
buf.append(hexChars[low]);
}
/*
* Converts a byte array to hex string
*/
private String toHexString(byte[] block) {
StringBuffer buf = new StringBuffer();
int len = block.length;
for (int i = 0; i < len; i++) {
byte2hex(block[i], buf);
if (i < len-1) {
buf.append(":");
}
}
return buf.toString();
}
/*
* Prints the usage of this test.
*/
private void usage() {
System.err.print("DHKeyAgreement usage: ");
System.err.println("[-gen]");
}
// The 1024 bit Diffie-Hellman modulus values used by SKIP
private static final byte skip1024ModulusBytes[] = {
(byte)0xF4, (byte)0x88, (byte)0xFD, (byte)0x58,
(byte)0x4E, (byte)0x49, (byte)0xDB, (byte)0xCD,
(byte)0x20, (byte)0xB4, (byte)0x9D, (byte)0xE4,
(byte)0x91, (byte)0x07, (byte)0x36, (byte)0x6B,
(byte)0x33, (byte)0x6C, (byte)0x38, (byte)0x0D,
(byte)0x45, (byte)0x1D, (byte)0x0F, (byte)0x7C,
(byte)0x88, (byte)0xB3, (byte)0x1C, (byte)0x7C,
(byte)0x5B, (byte)0x2D, (byte)0x8E, (byte)0xF6,
(byte)0xF3, (byte)0xC9, (byte)0x23, (byte)0xC0,
(byte)0x43, (byte)0xF0, (byte)0xA5, (byte)0x5B,
(byte)0x18, (byte)0x8D, (byte)0x8E, (byte)0xBB,
(byte)0x55, (byte)0x8C, (byte)0xB8, (byte)0x5D,
(byte)0x38, (byte)0xD3, (byte)0x34, (byte)0xFD,
(byte)0x7C, (byte)0x17, (byte)0x57, (byte)0x43,
(byte)0xA3, (byte)0x1D, (byte)0x18, (byte)0x6C,
(byte)0xDE, (byte)0x33, (byte)0x21, (byte)0x2C,
(byte)0xB5, (byte)0x2A, (byte)0xFF, (byte)0x3C,
(byte)0xE1, (byte)0xB1, (byte)0x29, (byte)0x40,
(byte)0x18, (byte)0x11, (byte)0x8D, (byte)0x7C,
(byte)0x84, (byte)0xA7, (byte)0x0A, (byte)0x72,
(byte)0xD6, (byte)0x86, (byte)0xC4, (byte)0x03,
(byte)0x19, (byte)0xC8, (byte)0x07, (byte)0x29,
(byte)0x7A, (byte)0xCA, (byte)0x95, (byte)0x0C,
(byte)0xD9, (byte)0x96, (byte)0x9F, (byte)0xAB,
(byte)0xD0, (byte)0x0A, (byte)0x50, (byte)0x9B,
(byte)0x02, (byte)0x46, (byte)0xD3, (byte)0x08,
(byte)0x3D, (byte)0x66, (byte)0xA4, (byte)0x5D,
(byte)0x41, (byte)0x9F, (byte)0x9C, (byte)0x7C,
(byte)0xBD, (byte)0x89, (byte)0x4B, (byte)0x22,
(byte)0x19, (byte)0x26, (byte)0xBA, (byte)0xAB,
(byte)0xA2, (byte)0x5E, (byte)0xC3, (byte)0x55,
(byte)0xE9, (byte)0x2F, (byte)0x78, (byte)0xC7
};
// The SKIP 1024 bit modulus
private static final BigInteger skip1024Modulus
= new BigInteger(1, skip1024ModulusBytes);
// The base used with the SKIP 1024 bit modulus
private static final BigInteger skip1024Base = BigInteger.valueOf(2);
}