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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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 android.keystore.cts;
import android.content.Context;
import android.security.keystore.KeyProtection;
import android.test.AndroidTestCase;
import android.keystore.cts.R;
import java.security.KeyPair;
import java.security.Security;
import java.security.Signature;
import java.util.Arrays;
import java.util.Collection;
public class ECDSASignatureTest extends AndroidTestCase {
public void testNONEwithECDSATruncatesInputToFieldSize() throws Exception {
for (ImportedKey key : importKatKeyPairs("NONEwithECDSA")) {
try {
assertNONEwithECDSATruncatesInputToFieldSize(key.getKeystoreBackedKeyPair());
} catch (Throwable e) {
throw new RuntimeException("Failed for " + key.getAlias(), e);
}
}
}
private void assertNONEwithECDSATruncatesInputToFieldSize(KeyPair keyPair)
throws Exception {
int keySizeBits = TestUtils.getKeySizeBits(keyPair.getPublic());
if (keySizeBits == 521) {
/*
* Skip P521 test until b/184307265 is fixed.
*/
return;
}
byte[] message = new byte[(keySizeBits * 3) / 8];
for (int i = 0; i < message.length; i++) {
message[i] = (byte) (i + 1);
}
Signature signature = Signature.getInstance("NONEwithECDSA");
signature.initSign(keyPair.getPrivate());
assertSame(Security.getProvider(SignatureTest.EXPECTED_PROVIDER_NAME),
signature.getProvider());
signature.update(message);
byte[] sigBytes = signature.sign();
signature = Signature.getInstance(signature.getAlgorithm(), signature.getProvider());
signature.initVerify(keyPair.getPublic());
// Verify the full-length message
signature.update(message);
assertTrue(signature.verify(sigBytes));
// Verify the message truncated to field size
signature.update(message, 0, (keySizeBits + 7) / 8);
assertTrue(signature.verify(sigBytes));
// Verify message truncated to one byte shorter than field size -- this should fail
signature.update(message, 0, (keySizeBits / 8) - 1);
assertFalse(signature.verify(sigBytes));
}
public void testNONEwithECDSASupportsMessagesShorterThanFieldSize() throws Exception {
for (ImportedKey key : importKatKeyPairs("NONEwithECDSA")) {
try {
assertNONEwithECDSASupportsMessagesShorterThanFieldSize(
key.getKeystoreBackedKeyPair());
} catch (Throwable e) {
throw new RuntimeException("Failed for " + key.getAlias(), e);
}
}
}
private void assertNONEwithECDSASupportsMessagesShorterThanFieldSize(KeyPair keyPair)
throws Exception {
int keySizeBits = TestUtils.getKeySizeBits(keyPair.getPublic());
byte[] message = new byte[(keySizeBits * 3 / 4) / 8];
for (int i = 0; i < message.length; i++) {
message[i] = (byte) (i + 1);
}
Signature signature = Signature.getInstance("NONEwithECDSA");
signature.initSign(keyPair.getPrivate());
assertSame(Security.getProvider(SignatureTest.EXPECTED_PROVIDER_NAME),
signature.getProvider());
signature.update(message);
byte[] sigBytes = signature.sign();
signature = Signature.getInstance(signature.getAlgorithm(), signature.getProvider());
signature.initVerify(keyPair.getPublic());
// Verify the message
signature.update(message);
assertTrue(signature.verify(sigBytes));
// Assert that the message is left-padded with zero bits
byte[] fullLengthMessage = TestUtils.leftPadWithZeroBytes(message, keySizeBits / 8);
signature.update(fullLengthMessage);
assertTrue(signature.verify(sigBytes));
}
private Collection<ImportedKey> importKatKeyPairs(String signatureAlgorithm)
throws Exception {
KeyProtection params =
TestUtils.getMinimalWorkingImportParametersForSigningingWith(signatureAlgorithm);
return importKatKeyPairs(getContext(), params);
}
static Collection<ImportedKey> importKatKeyPairs(
Context context, KeyProtection importParams) throws Exception {
return Arrays.asList(new ImportedKey[] {
TestUtils.importIntoAndroidKeyStore("testECsecp224r1", context,
R.raw.ec_key3_secp224r1_pkcs8, R.raw.ec_key3_secp224r1_cert, importParams),
TestUtils.importIntoAndroidKeyStore("testECsecp256r1", context,
R.raw.ec_key4_secp256r1_pkcs8, R.raw.ec_key4_secp256r1_cert, importParams),
TestUtils.importIntoAndroidKeyStore("testECsecp384r1", context,
R.raw.ec_key5_secp384r1_pkcs8, R.raw.ec_key5_secp384r1_cert, importParams),
TestUtils.importIntoAndroidKeyStore("testECsecp521r1", context,
R.raw.ec_key6_secp521r1_pkcs8, R.raw.ec_key6_secp521r1_cert, importParams),
});
}
}
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