public GenerateKeyPair ( ) : AsymmetricCipherKeyPair | ||
return | AsymmetricCipherKeyPair |
private void doTestEnc( int size, int privateValueSize, BigInteger g, BigInteger p) { ElGamalParameters dhParams = new ElGamalParameters(p, g, privateValueSize); ElGamalKeyGenerationParameters ekgParams = new ElGamalKeyGenerationParameters(new SecureRandom(), dhParams); ElGamalKeyPairGenerator kpGen = new ElGamalKeyPairGenerator(); kpGen.Init(ekgParams); // // generate pair // AsymmetricCipherKeyPair pair = kpGen.GenerateKeyPair(); ElGamalPublicKeyParameters pu = (ElGamalPublicKeyParameters) pair.Public; ElGamalPrivateKeyParameters pv = (ElGamalPrivateKeyParameters) pair.Private; checkKeySize(privateValueSize, pv); ElGamalEngine e = new ElGamalEngine(); e.Init(true, pu); if (e.GetOutputBlockSize() != size / 4) { Fail(size + " GetOutputBlockSize() on encryption failed."); } byte[] message = Hex.Decode("5468697320697320612074657374"); byte[] pText = message; byte[] cText = e.ProcessBlock(pText, 0, pText.Length); e.Init(false, pv); if (e.GetOutputBlockSize() != (size / 8) - 1) { Fail(size + " GetOutputBlockSize() on decryption failed."); } pText = e.ProcessBlock(cText, 0, cText.Length); if (!Arrays.AreEqual(message, pText)) { Fail(size + " bit test failed"); } e.Init(true, pu); byte[] bytes = new byte[e.GetInputBlockSize() + 2]; try { e.ProcessBlock(bytes, 0, bytes.Length); Fail("out of range block not detected"); } catch (DataLengthException) { // expected } try { bytes[0] = (byte)0xff; e.ProcessBlock(bytes, 0, bytes.Length - 1); Fail("out of range block not detected"); } catch (DataLengthException) { // expected } try { bytes[0] = (byte)0x7f; e.ProcessBlock(bytes, 0, bytes.Length - 1); } catch (DataLengthException) { Fail("in range block failed"); } }
public void TestElGamal() { BigInteger g512 = new BigInteger("153d5d6172adb43045b68ae8e1de1070b6137005686d29d3d73a7749199681ee5b212c9b96bfdcfa5b20cd5e3fd2044895d609cf9b410b7a0f12ca1cb9a428cc", 16); BigInteger p512 = new BigInteger("9494fec095f3b85ee286542b3836fc81a5dd0a0349b4c239dd38744d488cf8e31db8bcb7d33b41abb9e5a33cca9144b1cef332c94bf0573bf047a3aca98cdf3b", 16); ElGamalParameters dhParams = new ElGamalParameters(p512, g512); ElGamalKeyGenerationParameters parameters = new ElGamalKeyGenerationParameters(new SecureRandom(), dhParams); ElGamalKeyPairGenerator kpGen = new ElGamalKeyPairGenerator(); kpGen.Init(parameters); AsymmetricCipherKeyPair pair = kpGen.GenerateKeyPair(); ElGamalPublicKeyParameters pu1 = (ElGamalPublicKeyParameters)pair.Public; ElGamalPrivateKeyParameters pv1 = (ElGamalPrivateKeyParameters)pair.Private; ElGamalPublicKeyParameters pu2 = new ElGamalPublicKeyParameters(pu1.Y, pu1.Parameters); ElGamalPrivateKeyParameters pv2 = new ElGamalPrivateKeyParameters(pv1.X, pv1.Parameters); ElGamalPublicKeyParameters pu3 = new ElGamalPublicKeyParameters(pv1.X, pu1.Parameters); ElGamalPrivateKeyParameters pv3 = new ElGamalPrivateKeyParameters(pu1.Y, pu1.Parameters); doTest(pu1, pu2, pu3); doTest(pv1, pv2, pv3); ElGamalParameters pr1 = pu1.Parameters; ElGamalParameters pr2 = new ElGamalParameters(pr1.P, pr1.G); ElGamalParameters pr3 = new ElGamalParameters(pr1.G, pr1.P); doTest(pr1, pr2, pr3); pu2 = new ElGamalPublicKeyParameters(pu1.Y, pr2); pv2 = new ElGamalPrivateKeyParameters(pv1.X, pr2); doTest(pu1, pu2, pu3); doTest(pv1, pv2, pv3); ElGamalTestKeyParameters k1 = new ElGamalTestKeyParameters(false, null); ElGamalTestKeyParameters k2 = new ElGamalTestKeyParameters(false, null); ElGamalTestKeyParameters k3 = new ElGamalTestKeyParameters(false, pu1.Parameters); doTest(k1, k2, k3); }
/** * this test is can take quiet a while * * @param size size of key in bits. */ private void doTestGeneration( int size) { ElGamalParametersGenerator pGen = new ElGamalParametersGenerator(); pGen.Init(size, 10, new SecureRandom()); ElGamalParameters elParams = pGen.GenerateParameters(); if (elParams.L != 0) { Fail("ElGamalParametersGenerator failed to set L to 0 in generated ElGamalParameters"); } ElGamalKeyGenerationParameters ekgParams = new ElGamalKeyGenerationParameters(new SecureRandom(), elParams); ElGamalKeyPairGenerator kpGen = new ElGamalKeyPairGenerator(); kpGen.Init(ekgParams); // // generate first pair // AsymmetricCipherKeyPair pair = kpGen.GenerateKeyPair(); ElGamalPublicKeyParameters pu = (ElGamalPublicKeyParameters)pair.Public; ElGamalPrivateKeyParameters pv = (ElGamalPrivateKeyParameters)pair.Private; ElGamalEngine e = new ElGamalEngine(); e.Init(true, new ParametersWithRandom(pu, new SecureRandom())); byte[] message = Hex.Decode("5468697320697320612074657374"); byte[] pText = message; byte[] cText = e.ProcessBlock(pText, 0, pText.Length); e.Init(false, pv); pText = e.ProcessBlock(cText, 0, cText.Length); if (!Arrays.AreEqual(message, pText)) { Fail("generation test failed"); } }