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/**
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.security.wycheproof;
import static org.junit.Assert.assertEquals;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.ECPrivateKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.KeyAgreement;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** This test uses test vectors in JSON format to check implementations of ECDH. */
@RunWith(JUnit4.class)
public class JsonEcdhTest {
/** Convenience mehtod to get a String from a JsonObject */
protected static String getString(JsonObject object, String name) throws Exception {
return object.get(name).getAsString();
}
/** Convenience method to get a BigInteger from a JsonObject */
protected static BigInteger getBigInteger(JsonObject object, String name) throws Exception {
return JsonUtil.asBigInteger(object.get(name));
}
/** Convenience method to get a byte array from a JsonObject */
protected static byte[] getBytes(JsonObject object, String name) throws Exception {
return JsonUtil.asByteArray(object.get(name));
}
/**
* Example for test vector
* {
* "algorithm" : "ECDH",
* "header" : [],
* "notes" : {
* "AddSubChain" : "The private key has a special value....",
* }
* "generatorVersion" : "0.7",
* "numberOfTests" : 308,
* "testGroups" : [
* {
* "type" : "EcdhTest",
* "tests" : [
* {
* "comment" : "normal case",
* "curve" : "secp224r1",
* "private" : "565577a49415ca761a0322ad54e4ad0ae7625174baf372c2816f5328",
* "public" : "30...",
* "result" : "valid",
* "shared" : "b8ecdb552d39228ee332bafe4886dbff272f7109edf933bc7542bd4f",
* "tcId" : 1
* },
* ...
**/
public void testEcdhComp(String filename) throws Exception {
JsonObject test = JsonUtil.getTestVectors(filename);
// This test expects test vectors as defined in wycheproof/schemas/ecdh_test_schema.json.
// In particular, this means that the public keys use X509 encoding.
// Test vectors with different encodings of the keys have a different schema.
final String expectedSchema = "ecdh_test_schema.json";
String schema = test.get("schema").getAsString();
assertEquals("Unexpected schema in file:" + filename, expectedSchema, schema);
int numTests = test.get("numberOfTests").getAsInt();
int passedTests = 0;
int rejectedTests = 0; // invalid test vectors leading to exceptions
int skippedTests = 0; // valid test vectors leading to exceptions
int errors = 0;
for (JsonElement g : test.getAsJsonArray("testGroups")) {
JsonObject group = g.getAsJsonObject();
String curve = getString(group, "curve");
for (JsonElement t : group.getAsJsonArray("tests")) {
JsonObject testcase = t.getAsJsonObject();
int tcid = testcase.get("tcId").getAsInt();
String comment = getString(testcase, "comment");
BigInteger priv = getBigInteger(testcase, "private");
byte[] publicEncoded = getBytes(testcase, "public");
String result = getString(testcase, "result");
String expectedHex = getString(testcase, "shared");
KeyFactory kf = KeyFactory.getInstance("EC");
try {
ECPrivateKeySpec spec = new ECPrivateKeySpec(priv, EcUtil.getCurveSpecRef(curve));
PrivateKey privKey = kf.generatePrivate(spec);
X509EncodedKeySpec x509keySpec = new X509EncodedKeySpec(publicEncoded);
PublicKey pubKey = kf.generatePublic(x509keySpec);
KeyAgreement ka = KeyAgreement.getInstance("ECDH");
ka.init(privKey);
ka.doPhase(pubKey, true);
String sharedHex = TestUtil.bytesToHex(ka.generateSecret());
if (result.equals("invalid")) {
System.out.println(
"Computed ECDH with invalid parameters"
+ " tcId:"
+ tcid
+ " comment:"
+ comment
+ " shared:"
+ sharedHex);
errors++;
} else if (!expectedHex.equals(sharedHex)) {
System.out.println(
"Incorrect ECDH computation"
+ " tcId:"
+ tcid
+ " comment:"
+ comment
+ "\nshared:"
+ sharedHex
+ "\nexpected:"
+ expectedHex);
errors++;
} else {
passedTests++;
}
} catch (InvalidKeySpecException | InvalidKeyException | NoSuchAlgorithmException ex) {
// These are the exception that we expect to see when a curve is not implemented
// or when a key is not valid.
if (result.equals("valid")) {
skippedTests++;
} else {
rejectedTests++;
}
} catch (Exception ex) {
// Other exceptions typically indicate that something is wrong with the implementation.
System.out.println(
"Test vector with tcId:" + tcid + " comment:" + comment + " throws:" + ex.toString());
errors++;
}
}
}
assertEquals(0, errors);
assertEquals(numTests, passedTests + rejectedTests + skippedTests);
}
@Test
public void testSecp224r1() throws Exception {
testEcdhComp("ecdh_secp224r1_test.json");
}
@Test
public void testSecp256r1() throws Exception {
testEcdhComp("ecdh_secp256r1_test.json");
}
@Test
public void testSecp384r1() throws Exception {
testEcdhComp("ecdh_secp384r1_test.json");
}
@Test
public void testSecp521r1() throws Exception {
testEcdhComp("ecdh_secp521r1_test.json");
}
@Test
public void testSecp256k1() throws Exception {
testEcdhComp("ecdh_secp256k1_test.json");
}
@Test
public void testBrainpoolP224r1() throws Exception {
testEcdhComp("ecdh_brainpoolP224r1_test.json");
}
@Test
public void testBrainpoolP256r1() throws Exception {
testEcdhComp("ecdh_brainpoolP256r1_test.json");
}
@Test
public void testBrainpoolP320r1() throws Exception {
testEcdhComp("ecdh_brainpoolP320r1_test.json");
}
@Test
public void testBrainpoolP384r1() throws Exception {
testEcdhComp("ecdh_brainpoolP384r1_test.json");
}
@Test
public void testBrainpoolP512r1() throws Exception {
testEcdhComp("ecdh_brainpoolP512r1_test.json");
}
}
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