| package org.bouncycastle.crypto.ec.test; |
| |
| import java.math.BigInteger; |
| import java.security.SecureRandom; |
| |
| import org.bouncycastle.crypto.AsymmetricCipherKeyPair; |
| import org.bouncycastle.crypto.ec.ECDecryptor; |
| import org.bouncycastle.crypto.ec.ECElGamalDecryptor; |
| import org.bouncycastle.crypto.ec.ECElGamalEncryptor; |
| import org.bouncycastle.crypto.ec.ECEncryptor; |
| import org.bouncycastle.crypto.ec.ECNewPublicKeyTransform; |
| import org.bouncycastle.crypto.ec.ECNewRandomnessTransform; |
| import org.bouncycastle.crypto.ec.ECPair; |
| import org.bouncycastle.crypto.ec.ECPairTransform; |
| import org.bouncycastle.crypto.generators.ECKeyPairGenerator; |
| import org.bouncycastle.crypto.params.ECDomainParameters; |
| import org.bouncycastle.crypto.params.ECKeyGenerationParameters; |
| import org.bouncycastle.crypto.params.ECPrivateKeyParameters; |
| import org.bouncycastle.crypto.params.ECPublicKeyParameters; |
| import org.bouncycastle.crypto.params.ParametersWithRandom; |
| import org.bouncycastle.math.ec.ECConstants; |
| import org.bouncycastle.math.ec.ECCurve; |
| import org.bouncycastle.math.ec.ECPoint; |
| import org.bouncycastle.util.encoders.Hex; |
| import org.bouncycastle.util.test.SimpleTest; |
| |
| public class ECTransformationTest |
| extends SimpleTest |
| { |
| public String getName() |
| { |
| return "ECTransformationTest"; |
| } |
| |
| public void performTest() |
| throws Exception |
| { |
| BigInteger n = new BigInteger("6277101735386680763835789423176059013767194773182842284081"); |
| |
| ECCurve.Fp curve = new ECCurve.Fp( |
| new BigInteger("6277101735386680763835789423207666416083908700390324961279"), // q |
| new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16), // a |
| new BigInteger("64210519e59c80e70fa7e9ab72243049feb8deecc146b9b1", 16), // b |
| n, ECConstants.ONE); |
| |
| ECDomainParameters params = new ECDomainParameters( |
| curve, |
| curve.decodePoint(Hex.decode("03188da80eb03090f67cbf20eb43a18800f4ff0afd82ff1012")), // G |
| n); |
| |
| ECPublicKeyParameters pubKey = new ECPublicKeyParameters( |
| curve.decodePoint(Hex.decode("0262b12d60690cdcf330babab6e69763b471f994dd702d16a5")), // Q |
| params); |
| |
| ECPrivateKeyParameters priKey = new ECPrivateKeyParameters( |
| new BigInteger("651056770906015076056810763456358567190100156695615665659"), // d |
| params); |
| |
| |
| ParametersWithRandom pRandom = new ParametersWithRandom(pubKey, new SecureRandom()); |
| |
| doTest(priKey, pRandom, BigInteger.valueOf(20)); |
| |
| BigInteger rand = new BigInteger(pubKey.getParameters().getN().bitLength() - 1, new SecureRandom()); |
| |
| doTest(priKey, pRandom, rand); |
| doSameKeyTest(priKey, pRandom, rand); |
| } |
| |
| private void doTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value) |
| { |
| ECPoint data = priKey.getParameters().getG().multiply(value); |
| |
| ECEncryptor encryptor = new ECElGamalEncryptor(); |
| |
| encryptor.init(pRandom); |
| |
| ECPair pair = encryptor.encrypt(data); |
| |
| ECKeyPairGenerator ecGen = new ECKeyPairGenerator(); |
| |
| ecGen.init(new ECKeyGenerationParameters(priKey.getParameters(), new SecureRandom())); |
| |
| AsymmetricCipherKeyPair reEncKP = ecGen.generateKeyPair(); |
| |
| ECPairTransform ecr = new ECNewPublicKeyTransform(); |
| |
| ecr.init(reEncKP.getPublic()); |
| |
| ECPair srcPair = pair; |
| |
| // re-encrypt the message portion |
| pair = ecr.transform(srcPair); |
| |
| ECDecryptor decryptor = new ECElGamalDecryptor(); |
| |
| decryptor.init(priKey); |
| |
| // decrypt out the original private key |
| ECPoint p = decryptor.decrypt(new ECPair(srcPair.getX(), pair.getY())); |
| |
| decryptor.init(reEncKP.getPrivate()); |
| |
| // decrypt the fully transformed point. |
| ECPoint result = decryptor.decrypt(new ECPair(pair.getX(), p)); |
| |
| if (!data.equals(result)) |
| { |
| fail("point pair failed to decrypt back to original"); |
| } |
| } |
| |
| private void doSameKeyTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value) |
| { |
| ECPoint data = priKey.getParameters().getG().multiply(value); |
| |
| ECEncryptor encryptor = new ECElGamalEncryptor(); |
| |
| encryptor.init(pRandom); |
| |
| ECPair pair = encryptor.encrypt(data); |
| |
| ECPairTransform ecr = new ECNewRandomnessTransform(); |
| |
| ecr.init(pRandom); |
| |
| ECPair srcPair = pair; |
| |
| // re-encrypt the message portion |
| pair = ecr.transform(srcPair); |
| |
| ECDecryptor decryptor = new ECElGamalDecryptor(); |
| |
| decryptor.init(priKey); |
| |
| // decrypt the fully transformed point. |
| ECPoint result = decryptor.decrypt(pair); |
| |
| if (!data.equals(result)) |
| { |
| fail("point pair failed to decrypt back to original"); |
| } |
| } |
| |
| public static void main(String[] args) |
| { |
| runTest(new ECTransformationTest()); |
| } |
| } |