java.lang.IllegalArgumentException : string curve25519 not an OID bouncycaSTLe 1. 52

Question

我正在尝试使用曲线 25519 的/java bouncy caSTLe 1.52 实现生成 key 对

java.lang.IllegalArgumentException: string curve25519 not an OID

这是我的代码:

public KeyPair generateKeys() throws NoSuchAlgorithmException,
        NoSuchProviderException, InvalidAlgorithmParameterException {
    ECParameterSpec ecSpec = ECNamedCurveTable.getParameterSpec("curve25519");
    KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA", "BC");
    g.initialize(ecSpec, new SecureRandom());

    return g.generateKeyPair();
}

这段代码的结果是下面的堆栈跟踪:

java.lang.IllegalArgumentException: string curve25519 not an OID at org.bouncycastle.asn1.ASN1ObjectIdentifier.(Unknown Source) at org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey.getEncoded(Unknown Source) at org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey.getPublicKeyDetails(Unknown Source) at org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey.(Unknown Source) at org.bouncycastle.jcajce.provider.asymmetric.ec.KeyPairGeneratorSpi$EC.generateKeyPair(Unknown Source) at com.poc.databank.encryption.BouncyCastleEncryption.generateKeys(BouncyCastleEncryption.java:22) at com.poc.databank.encryption.BouncyCastleTest.testApp(BouncyCastleTest.java:16) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

我检查了充气城堡代码，发现 curve25519 在 CustomNamedCurves 类中注册为

defineCurve("curve25519", curve25519);

但不像

defineCurveWithOID("secp192k1", SECObjectIdentifiers.secp192k1,
            secp192k1);

我明白这应该是有原因的。请帮助我找到一种方法，如何使用 curve25519 生成 key 对。

Answer 1

需要获取X9.62格式的曲线参数，并转成JCE格式

X9ECParameters ecP = CustomNamedCurves.getByName("curve25519");
ECParameterSpec ecSpec=new ECParameterSpec(ecP.getCurve(), ecP.getG(),
        ecP.getN(), ecP.getH(), ecP.getSeed());

然后正常生成ECDSA key

Provider bcProvider = new BouncyCastleProvider();
KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA", bcProvider);
g.initialize(ecSpec, new SecureRandom());
KeyPair keyPair = g.generateKeyPair();
Assert.assertNotNull(keyPair);

我相信 curve25519 没有分配给它的对象标识符。但这可能不能成为无法按名称找到曲线的借口。