ECDSA 字节数组转换为私钥错误

Question

我想将我的私钥保存在 json 文件（十六进制格式）中，然后将其读取为私钥。

此处Keys生成函数

public void generateKeyPair() {
    try {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDSA", "BC");
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
        ECGenParameterSpec ecSpec = new ECGenParameterSpec("secp256k1");
        keyGen.initialize(ecSpec,random);
        KeyPair keyPair = keyGen.generateKeyPair();
        privateKey = keyPair.getPrivate();
        publicKey = keyPair.getPublic();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

这就是我将其保存到 json 文件中的方式

        a.generateKeyPair();
        byte[] enc_key = a.privateKey.getEncoded();

        StringBuilder key_builder = new StringBuilder();
        for(byte b : enc_key){
            key_builder.append(String.format( "%02X",b));
        }

        String serialized_key = key_builder.toString();
        account.privateKey=serialized_key;
        try (Writer writer = new FileWriter("Output.json")) {
            Gson gson = new GsonBuilder().create();
            gson.toJson(account, writer);
        } catch (IOException e) {
            e.printStackTrace();
        }

并从文件中读取

        Gson gson = new GsonBuilder().create();
        try (Reader read1 = new FileReader("Output.json")) {
            account=gson.fromJson(read1,account.getClass());
            byte[] encoded_key=account.privateKey.getBytes();
            a.privateKey = getPrivateKey(encoded_key);

    public static PrivateKey getPrivateKey(byte[] privkey) throws NoSuchAlgorithmException, InvalidKeySpecException {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(privkey);
    KeyFactory kf = null;
    try {
        kf = KeyFactory.getInstance("ECDSA", "BC");
    } catch (NoSuchProviderException e) {
        e.printStackTrace();
    }
    PrivateKey privateKey = kf.generatePrivate(privateKeySpec);
    return privateKey;
}

函数失败，出现错误

java.security.spec.InvalidKeySpecException: encoded key spec not recognized: failed to construct sequence from byte[]: unknown tag 19 encountered

Answer 1

您忘记了对私钥进行十六进制解码。只是执行 getBytes 不会那样做。

编码字节以序列开始，标签0x30。这在十六进制中当然是 "30" 或者在 ASCII 中：0x33, 0x30：这些是 getBytes 返回的前两个字节。现在解码器查看位值为 0b001_10011 的第一个字节。最后 5 位编码标记值，即 16 + 2 + 1 = 19。因此出现特定错误。

ECDSA 字节数组转换为私钥错误

ECDSA byte array into Private Key Error

java

encryption

ecdsa