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当我尝试从字节数组制作 ECC 私钥时，出现下面提到的异常。我有公钥/私钥和来自 C 库 micro-ecc/uECC.h 的签名输出。C 使用 secp192r1 曲线。我正在尝试使用 Java 中 C 生成的密钥来验证数据。如何将字节数组转换为私钥/公钥？

Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] kb = new byte[]{(byte)0x24, (byte)0xF4, (byte)0x36, (byte)0x16, (byte)0xD0, (byte)0x96, (byte)0x12, (byte)0x63, (byte)0x90, (byte)0x2E, (byte)0x51, (byte)0xF6, (byte)0x87, (byte)0x55, (byte)0xAB, (byte)0xCB, (byte)0x5D, (byte)0xAC, (byte)0x56, (byte)0x1A, (byte)0xA5, (byte)0xFA, (byte)0x55, (byte)0xDB};
X509EncodedKeySpec ks = new X509EncodedKeySpec(kb);
KeyFactory kf = java.security.KeyFactory.getInstance("ECDH", "BC");
org.bouncycastle.jce.interfaces.ECPrivateKey remotePublicKey = (org.bouncycastle.jce.interfaces.ECPrivateKey)kf.generatePublic(ks);

java.security.spec.InvalidKeySpecException: encoded key spec not recognised
at org.bouncycastle.jcajce.provider.asymmetric.util.BaseKeyFactorySpi.engineGeneratePublic(Unknown Source)
at org.bouncycastle.jcajce.provider.asymmetric.ec.KeyFactorySpi.engineGeneratePublic(Unknown Source)
at java.security.KeyFactory.generatePublic(KeyFactory.java:328)

我也尝试过使用

KeyFactory.getInstance("ECDH", "BC");

但它在上面抛出了相同的异常。

KeyFactory.getInstance("EC");

投掷

java.security.InvalidKeyException: invalid key format

或者

java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException : DerInputStream.getLength(): lengthTag=116, too big.
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1 回答 1

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X509EncodedKeySpec(key)或PKCS8EncodedKeySpec(key)构造函数采用编码格式的私钥/公钥。未编码的密钥字节可以这样转换：

Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
ECNamedCurveParameterSpec spec = ECNamedCurveTable.getParameterSpec("secp192r1");

ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(new BigInteger(1, privateKeyBytes), spec); 

ECNamedCurveSpec params = new ECNamedCurveSpec("secp192r1", spec.getCurve(), spec.getG(), spec.getN());
java.security.spec.ECPoint w = new java.security.spec.ECPoint(new BigInteger(1, Arrays.copyOfRange(publicKeyBytes, 0, 24)), new BigInteger(1, Arrays.copyOfRange(publicKeyBytes, 24, 48)));
PublicKey publicKey = factory.generatePublic(new java.security.spec.ECPublicKeySpec(w, params));
于 2016-06-10T10:17:38.653 回答