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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
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@@ -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];