diff options
Diffstat (limited to 'prov/src/test/java/org/spongycastle/jce/provider/test/ElGamalTest.java')
| -rw-r--r-- | prov/src/test/java/org/spongycastle/jce/provider/test/ElGamalTest.java | 497 |
1 files changed, 497 insertions, 0 deletions
diff --git a/prov/src/test/java/org/spongycastle/jce/provider/test/ElGamalTest.java b/prov/src/test/java/org/spongycastle/jce/provider/test/ElGamalTest.java new file mode 100644 index 00000000..5fb8a290 --- /dev/null +++ b/prov/src/test/java/org/spongycastle/jce/provider/test/ElGamalTest.java @@ -0,0 +1,497 @@ +package org.spongycastle.jce.provider.test; + +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.ObjectInputStream; +import java.io.ObjectOutputStream; +import java.math.BigInteger; +import java.security.AlgorithmParameterGenerator; +import java.security.AlgorithmParameters; +import java.security.KeyFactory; +import java.security.KeyPair; +import java.security.KeyPairGenerator; +import java.security.SecureRandom; +import java.security.Security; +import java.security.spec.PKCS8EncodedKeySpec; +import java.security.spec.X509EncodedKeySpec; + +import javax.crypto.Cipher; +import javax.crypto.interfaces.DHPrivateKey; +import javax.crypto.interfaces.DHPublicKey; +import javax.crypto.spec.DHParameterSpec; + +import org.spongycastle.jcajce.provider.config.ConfigurableProvider; +import org.spongycastle.jce.interfaces.PKCS12BagAttributeCarrier; +import org.spongycastle.jce.provider.BouncyCastleProvider; +import org.spongycastle.util.encoders.Hex; +import org.spongycastle.util.test.SimpleTest; + +public class ElGamalTest + extends SimpleTest +{ + private BigInteger g512 = new BigInteger("153d5d6172adb43045b68ae8e1de1070b6137005686d29d3d73a7749199681ee5b212c9b96bfdcfa5b20cd5e3fd2044895d609cf9b410b7a0f12ca1cb9a428cc", 16); + private BigInteger p512 = new BigInteger("9494fec095f3b85ee286542b3836fc81a5dd0a0349b4c239dd38744d488cf8e31db8bcb7d33b41abb9e5a33cca9144b1cef332c94bf0573bf047a3aca98cdf3b", 16); + + private BigInteger g768 = new BigInteger("7c240073c1316c621df461b71ebb0cdcc90a6e5527e5e126633d131f87461c4dc4afc60c2cb0f053b6758871489a69613e2a8b4c8acde23954c08c81cbd36132cfd64d69e4ed9f8e51ed6e516297206672d5c0a69135df0a5dcf010d289a9ca1", 16); + private BigInteger p768 = new BigInteger("8c9dd223debed1b80103b8b309715be009d48860ed5ae9b9d5d8159508efd802e3ad4501a7f7e1cfec78844489148cd72da24b21eddd01aa624291c48393e277cfc529e37075eccef957f3616f962d15b44aeab4039d01b817fde9eaa12fd73f", 16); + + private BigInteger g1024 = new BigInteger("1db17639cdf96bc4eabba19454f0b7e5bd4e14862889a725c96eb61048dcd676ceb303d586e30f060dbafd8a571a39c4d823982117da5cc4e0f89c77388b7a08896362429b94a18a327604eb7ff227bffbc83459ade299e57b5f77b50fb045250934938efa145511166e3197373e1b5b1e52de713eb49792bedde722c6717abf", 16); + private BigInteger p1024 = new BigInteger("a00e283b3c624e5b2b4d9fbc2653b5185d99499b00fd1bf244c6f0bb817b4d1c451b2958d62a0f8a38caef059fb5ecd25d75ed9af403f5b5bdab97a642902f824e3c13789fed95fa106ddfe0ff4a707c85e2eb77d49e68f2808bcea18ce128b178cd287c6bc00efa9a1ad2a673fe0dceace53166f75b81d6709d5f8af7c66bb7", 16); + + public String getName() + { + return "ElGamal"; + } + + private void testGP( + int size, + int privateValueSize, + BigInteger g, + BigInteger p) + throws Exception + { + DHParameterSpec elParams = new DHParameterSpec(p, g, privateValueSize); + KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ElGamal", "SC"); + byte[] in = "This is a test".getBytes(); + + keyGen.initialize(elParams); + + KeyPair keyPair = keyGen.generateKeyPair(); + SecureRandom rand = new SecureRandom(); + + checkKeySize(privateValueSize, keyPair); + + Cipher cipher = Cipher.getInstance("ElGamal", "SC"); + + cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand); + + if (cipher.getOutputSize(in.length) != (size / 8) * 2) + { + fail("getOutputSize wrong on encryption"); + } + + byte[] out = cipher.doFinal(in); + + cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate()); + + if (cipher.getOutputSize(out.length) != (size / 8) - 1) + { + fail("getOutputSize wrong on decryption"); + } + + // + // No Padding - maximum length + // + byte[] modBytes = ((DHPublicKey)keyPair.getPublic()).getParams().getP().toByteArray(); + byte[] maxInput = new byte[modBytes.length - 1]; + + maxInput[0] |= 0x7f; + + cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand); + + out = cipher.doFinal(maxInput); + + cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate()); + + out = cipher.doFinal(out); + + if (!areEqual(out, maxInput)) + { + fail("NoPadding test failed on decrypt expected " + new String(Hex.encode(maxInput)) + " got " + new String(Hex.encode(out))); + } + + // + // encrypt/decrypt + // + + Cipher c1 = Cipher.getInstance("ElGamal", "SC"); + Cipher c2 = Cipher.getInstance("ElGamal", "SC"); + + c1.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand); + + byte[] out1 = c1.doFinal(in); + + c2.init(Cipher.DECRYPT_MODE, keyPair.getPrivate()); + + byte[] out2 = c2.doFinal(out1); + + if (!areEqual(in, out2)) + { + fail(size + " encrypt test failed"); + } + + // + // encrypt/decrypt with update + // + int outLen = c1.update(in, 0, 2, out1, 0); + + outLen += c1.doFinal(in, 2, in.length - 2, out1, outLen); + + outLen = c2.update(out1, 0, 2, out2, 0); + + outLen += c2.doFinal(out1, 2, out1.length - 2, out2, outLen); + + if (!areEqual(in, out2)) + { + fail(size + " encrypt with update test failed"); + } + + // + // public key encoding test + // + byte[] pubEnc = keyPair.getPublic().getEncoded(); + KeyFactory keyFac = KeyFactory.getInstance("ElGamal", "SC"); + X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(pubEnc); + DHPublicKey pubKey = (DHPublicKey)keyFac.generatePublic(pubX509); + DHParameterSpec spec = pubKey.getParams(); + + if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) + { + fail(size + " bit public key encoding/decoding test failed on parameters"); + } + + if (!((DHPublicKey)keyPair.getPublic()).getY().equals(pubKey.getY())) + { + fail(size + " bit public key encoding/decoding test failed on y value"); + } + + // + // public key serialisation test + // + pubKey = (DHPublicKey)serializeDeserialize(keyPair.getPublic()); + spec = pubKey.getParams(); + + if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) + { + fail(size + " bit public key serialisation test failed on parameters"); + } + + if (!((DHPublicKey)keyPair.getPublic()).getY().equals(pubKey.getY())) + { + fail(size + " bit public key serialisation test failed on y value"); + } + + if (!keyPair.getPublic().equals(pubKey)) + { + fail("equals test failed"); + } + + if (keyPair.getPublic().hashCode() != pubKey.hashCode()) + { + fail("hashCode test failed"); + } + + // + // private key encoding test + // + byte[] privEnc = keyPair.getPrivate().getEncoded(); + PKCS8EncodedKeySpec privPKCS8 = new PKCS8EncodedKeySpec(privEnc); + DHPrivateKey privKey = (DHPrivateKey)keyFac.generatePrivate(privPKCS8); + + spec = privKey.getParams(); + + if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) + { + fail(size + " bit private key encoding/decoding test failed on parameters"); + } + + if (!((DHPrivateKey)keyPair.getPrivate()).getX().equals(privKey.getX())) + { + fail(size + " bit private key encoding/decoding test failed on y value"); + } + + // + // private key serialisation test + // + privKey = (DHPrivateKey)serializeDeserialize(keyPair.getPrivate()); + spec = privKey.getParams(); + + if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) + { + fail(size + " bit private key serialisation test failed on parameters"); + } + + if (!((DHPrivateKey)keyPair.getPrivate()).getX().equals(privKey.getX())) + { + fail(size + " bit private key serialisation test failed on y value"); + } + + if (!keyPair.getPrivate().equals(privKey)) + { + fail("equals test failed"); + } + + if (keyPair.getPrivate().hashCode() != privKey.hashCode()) + { + fail("hashCode test failed"); + } + + if (!(privKey instanceof PKCS12BagAttributeCarrier)) + { + fail("private key not implementing PKCS12 attribute carrier"); + } + } + + private Object serializeDeserialize(Object o) + throws Exception + { + ByteArrayOutputStream bOut = new ByteArrayOutputStream(); + ObjectOutputStream oOut = new ObjectOutputStream(bOut); + + oOut.writeObject(o); + oOut.close(); + + ObjectInputStream oIn = new ObjectInputStream(new ByteArrayInputStream(bOut.toByteArray())); + + return oIn.readObject(); + } + + private void checkKeySize(int privateValueSize, KeyPair aKeyPair) + { + if (privateValueSize != 0) + { + DHPrivateKey key = (DHPrivateKey)aKeyPair.getPrivate(); + + if (key.getX().bitLength() != privateValueSize) + { + fail("limited key check failed for key size " + privateValueSize); + } + } + } + + private void testRandom( + int size) + throws Exception + { + AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("ElGamal", "SC"); + a.init(size, new SecureRandom()); + AlgorithmParameters params = a.generateParameters(); + + byte[] encodeParams = params.getEncoded(); + + AlgorithmParameters a2 = AlgorithmParameters.getInstance("ElGamal", "SC"); + a2.init(encodeParams); + + // a and a2 should be equivalent! + byte[] encodeParams_2 = a2.getEncoded(); + + if (!areEqual(encodeParams, encodeParams_2)) + { + fail(this.getName() + ": encode/decode parameters failed"); + } + + DHParameterSpec elP = (DHParameterSpec)params.getParameterSpec(DHParameterSpec.class); + + testGP(size, 0, elP.getG(), elP.getP()); + } + + private void testDefault( + int privateValueSize, + BigInteger g, + BigInteger p) + throws Exception + { + DHParameterSpec elParams = new DHParameterSpec(p, g, privateValueSize); + int size = p.bitLength(); + + new BouncyCastleProvider().setParameter(ConfigurableProvider.DH_DEFAULT_PARAMS, elParams); + + KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ElGamal", "SC"); + byte[] in = "This is a test".getBytes(); + + keyGen.initialize(p.bitLength()); + + KeyPair keyPair = keyGen.generateKeyPair(); + + new BouncyCastleProvider().setParameter(ConfigurableProvider.DH_DEFAULT_PARAMS, elParams); + + SecureRandom rand = new SecureRandom(); + + checkKeySize(privateValueSize, keyPair); + + Cipher cipher = Cipher.getInstance("ElGamal", "SC"); + + cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand); + + if (cipher.getOutputSize(in.length) != (size / 8) * 2) + { + fail("getOutputSize wrong on encryption"); + } + + byte[] out = cipher.doFinal(in); + + cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate()); + + if (cipher.getOutputSize(out.length) != (size / 8) - 1) + { + fail("getOutputSize wrong on decryption"); + } + + // + // No Padding - maximum length + // + byte[] modBytes = ((DHPublicKey)keyPair.getPublic()).getParams().getP().toByteArray(); + byte[] maxInput = new byte[modBytes.length - 1]; + + maxInput[0] |= 0x7f; + + cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand); + + out = cipher.doFinal(maxInput); + + cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate()); + + out = cipher.doFinal(out); + + if (!areEqual(out, maxInput)) + { + fail("NoPadding test failed on decrypt expected " + new String(Hex.encode(maxInput)) + " got " + new String(Hex.encode(out))); + } + + // + // encrypt/decrypt + // + + Cipher c1 = Cipher.getInstance("ElGamal", "SC"); + Cipher c2 = Cipher.getInstance("ElGamal", "SC"); + + c1.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand); + + byte[] out1 = c1.doFinal(in); + + c2.init(Cipher.DECRYPT_MODE, keyPair.getPrivate()); + + byte[] out2 = c2.doFinal(out1); + + if (!areEqual(in, out2)) + { + fail(size + " encrypt test failed"); + } + + // + // encrypt/decrypt with update + // + int outLen = c1.update(in, 0, 2, out1, 0); + + outLen += c1.doFinal(in, 2, in.length - 2, out1, outLen); + + outLen = c2.update(out1, 0, 2, out2, 0); + + outLen += c2.doFinal(out1, 2, out1.length - 2, out2, outLen); + + if (!areEqual(in, out2)) + { + fail(size + " encrypt with update test failed"); + } + + // + // public key encoding test + // + byte[] pubEnc = keyPair.getPublic().getEncoded(); + KeyFactory keyFac = KeyFactory.getInstance("ElGamal", "SC"); + X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(pubEnc); + DHPublicKey pubKey = (DHPublicKey)keyFac.generatePublic(pubX509); + DHParameterSpec spec = pubKey.getParams(); + + if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) + { + fail(size + " bit public key encoding/decoding test failed on parameters"); + } + + if (!((DHPublicKey)keyPair.getPublic()).getY().equals(pubKey.getY())) + { + fail(size + " bit public key encoding/decoding test failed on y value"); + } + + // + // public key serialisation test + // + ByteArrayOutputStream bOut = new ByteArrayOutputStream(); + ObjectOutputStream oOut = new ObjectOutputStream(bOut); + + oOut.writeObject(keyPair.getPublic()); + + ByteArrayInputStream bIn = new ByteArrayInputStream(bOut.toByteArray()); + ObjectInputStream oIn = new ObjectInputStream(bIn); + + pubKey = (DHPublicKey)oIn.readObject(); + spec = pubKey.getParams(); + + if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) + { + fail(size + " bit public key serialisation test failed on parameters"); + } + + if (!((DHPublicKey)keyPair.getPublic()).getY().equals(pubKey.getY())) + { + fail(size + " bit public key serialisation test failed on y value"); + } + + // + // private key encoding test + // + byte[] privEnc = keyPair.getPrivate().getEncoded(); + PKCS8EncodedKeySpec privPKCS8 = new PKCS8EncodedKeySpec(privEnc); + DHPrivateKey privKey = (DHPrivateKey)keyFac.generatePrivate(privPKCS8); + + spec = privKey.getParams(); + + if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) + { + fail(size + " bit private key encoding/decoding test failed on parameters"); + } + + if (!((DHPrivateKey)keyPair.getPrivate()).getX().equals(privKey.getX())) + { + fail(size + " bit private key encoding/decoding test failed on y value"); + } + + // + // private key serialisation test + // + bOut = new ByteArrayOutputStream(); + oOut = new ObjectOutputStream(bOut); + + oOut.writeObject(keyPair.getPrivate()); + + bIn = new ByteArrayInputStream(bOut.toByteArray()); + oIn = new ObjectInputStream(bIn); + + privKey = (DHPrivateKey)oIn.readObject(); + spec = privKey.getParams(); + + if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) + { + fail(size + " bit private key serialisation test failed on parameters"); + } + + if (!((DHPrivateKey)keyPair.getPrivate()).getX().equals(privKey.getX())) + { + fail(size + " bit private key serialisation test failed on y value"); + } + } + + public void performTest() + throws Exception + { + testDefault(64, g512, p512); + + testGP(512, 0, g512, p512); + testGP(768, 0, g768, p768); + testGP(1024, 0, g1024, p1024); + + testGP(512, 64, g512, p512); + testGP(768, 128, g768, p768); + testGP(1024, 256, g1024, p1024); + + testRandom(256); + } + + public static void main( + String[] args) + { + Security.addProvider(new BouncyCastleProvider()); + + runTest(new ElGamalTest()); + } +} |