Java 到 ECCPrivateKey 的字节数组 - InvalidKeySpecException：无法识别编码的密钥规范

Question

当我尝试从字节数组生成 ECC 私钥时，出现下面提到的异常。我有 public/private 键和 C 库 micro-ecc/uECC.h 的签名输出。 C 使用了 secp192r1 曲线。我正在尝试使用 Java 中的 C 生成的密钥来验证数据。如何将字节数组转换为 private/public 键？

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)

我也试过用

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

但它抛出与上面相同的异常。

KeyFactory.getInstance("EC");

投掷

java.security.InvalidKeyException: invalid key format

或

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

Answer 1

X509EncodedKeySpec(key) 或 PKCS8EncodedKeySpec(key) 构造函数采用编码格式的 private/public 键。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));

Java 到 ECCPrivateKey 的字节数组 - InvalidKeySpecException：无法识别编码的密钥规范

Java byte array to ECCPrivateKey - InvalidKeySpecException: encoded key spec not recognised

cryptography

bouncycastle

elliptic-curve

java-security

private-key