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Downgrade to 256-bit curve for performance.

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Also reduced hash function to 256 bits because our target security level
is now 128 bits.
This commit is contained in:
akwizgran
2015-01-09 13:23:18 +00:00
parent 5d46d3a4b4
commit 112d80420c
10 changed files with 53 additions and 99 deletions
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24
briar-tests/src/org/briarproject/crypto/EllipticCurveMultiplicationTest.java
View File

@@ -1,10 +1,6 @@
package org.briarproject.crypto;
import static org.briarproject.crypto.EllipticCurveConstants.CURVE;
import static org.briarproject.crypto.EllipticCurveConstants.G;
import static org.briarproject.crypto.EllipticCurveConstants.H;
import static org.briarproject.crypto.EllipticCurveConstants.PARAMETERS;
import static org.briarproject.crypto.EllipticCurveConstants.Q;
import java.math.BigInteger;
import java.security.SecureRandom;
@@ -27,24 +23,22 @@ public class EllipticCurveMultiplicationTest extends BriarTestCase {
@Test
public void testMultiplierProducesSameResultsAsDefault() throws Exception {
// Instantiate the built-in implementation of the curve, which uses
// the default multiplier
// Instantiate the default implementation of the curve
X9ECParameters defaultX9Parameters =
TeleTrusTNamedCurves.getByName("brainpoolp384r1");
TeleTrusTNamedCurves.getByName("brainpoolp256r1");
ECCurve defaultCurve = defaultX9Parameters.getCurve();
ECPoint defaultG = defaultX9Parameters.getG();
BigInteger defaultQ = defaultX9Parameters.getN();
BigInteger defaultN = defaultX9Parameters.getN();
BigInteger defaultH = defaultX9Parameters.getH();
// Check that the built-in parameters are equal to our parameters,
// which use the Montgomery ladder multiplier
assertEquals(CURVE, defaultCurve);
assertEquals(G, defaultG);
assertEquals(Q, defaultQ);
assertEquals(H, defaultH);
// Check that the default parameters are equal to our parameters
assertEquals(PARAMETERS.getCurve(), defaultCurve);
assertEquals(PARAMETERS.getG(), defaultG);
assertEquals(PARAMETERS.getN(), defaultN);
assertEquals(PARAMETERS.getH(), defaultH);
// ECDomainParameters doesn't have an equals() method, but it's just a
// container for the parameters
ECDomainParameters defaultParameters = new ECDomainParameters(
defaultCurve, defaultG, defaultQ, defaultH);
defaultCurve, defaultG, defaultN, defaultH);
// Generate two key pairs with each set of parameters, using the same
// deterministic PRNG for both sets of parameters
byte[] seed = new byte[32];

6
briar-tests/src/org/briarproject/crypto/EllipticCurvePerformanceTest.java
View File

@@ -13,7 +13,7 @@ import org.spongycastle.asn1.x9.X9ECParameters;
import org.spongycastle.crypto.AsymmetricCipherKeyPair;
import org.spongycastle.crypto.Digest;
import org.spongycastle.crypto.agreement.ECDHCBasicAgreement;
import org.spongycastle.crypto.digests.SHA384Digest;
import org.spongycastle.crypto.digests.SHA256Digest;
import org.spongycastle.crypto.generators.ECKeyPairGenerator;
import org.spongycastle.crypto.params.ECDomainParameters;
import org.spongycastle.crypto.params.ECKeyGenerationParameters;
@@ -83,7 +83,7 @@ public class EllipticCurvePerformanceTest {
List<byte[]> signatures = new ArrayList<byte[]>();
samples.clear();
for(int i = 0; i < SAMPLES; i++) {
Digest digest = new SHA384Digest();
Digest digest = new SHA256Digest();
DSAKCalculator calculator = new HMacDSAKCalculator(digest);
DSADigestSigner signer = new DSADigestSigner(new ECDSASigner(
calculator), digest);
@@ -97,7 +97,7 @@ public class EllipticCurvePerformanceTest {
// Time some signature verifications
samples.clear();
for(int i = 0; i < SAMPLES; i++) {
Digest digest = new SHA384Digest();
Digest digest = new SHA256Digest();
DSAKCalculator calculator = new HMacDSAKCalculator(digest);
DSADigestSigner signer = new DSADigestSigner(new ECDSASigner(
calculator), digest);

4
briar-tests/src/org/briarproject/messaging/ConsumersTest.java
View File

@@ -63,7 +63,7 @@ public class ConsumersTest extends BriarTestCase {
private final java.security.MessageDigest delegate;
private TestMessageDigest() throws GeneralSecurityException {
delegate = java.security.MessageDigest.getInstance("SHA-384");
delegate = java.security.MessageDigest.getInstance("SHA-256");
}
public byte[] digest() {
@@ -99,6 +99,6 @@ public class ConsumersTest extends BriarTestCase {
public void update(byte[] input, int offset, int len) {
delegate.update(input, offset, len);
}
}
}
}