创建PKCS#10 CSR和HMAC密封

Question

我无法正确创建PKCS#10证书签名请求和HMAC密封.我需要创建它们并发送到远程服务,它将为我生成PKCS#7格式的证书.更确切地说:

Create a key pair for certificate and generate PKCS#10 request 
(private key is never sent to the remote service)   
 use: key length 1024bit, SHA-1 algorithm, DER –encoded  
 Subject info: CN=name, serialNumber=userID, C=country (as above)   
Create HMAC seal  
 use DER coded PKCS#10 above as input  
 SMS-activation code as the key (10-digits)   

我将结果包装到SoapMessage并发送到远程服务并获得响应.响应错误,因为CSR或HMAC生成不正确.远程服务不会发送更具体的错误消息,但正如我所说,错误是由于我错误生成的CSR或HMAC.主题和HMAC密钥是远程服务给出的示例值,这就是为什么问题不能归因于它们.

以下是我如何实现它的代码

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.SignatureException;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.jce.PKCS10CertificationRequest;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;

public class CustomerCert {

    private final KeyPairGenerator keyGen;
    private final KeyPair keypair;
    private final PublicKey publicKey;
    private final PrivateKey privateKey;
    private final byte[] pkcs10;
    private HMac hmac;
    private byte[] hmacBytes;

    public CustomerCert(String company, String userId, String country) 
            throws NoSuchAlgorithmException, InvalidKeyException, NoSuchProviderException, SignatureException {
         keyGen = KeyPairGenerator.getInstance("DSA");
         keyGen.initialize(1024, new SecureRandom());
         keypair = keyGen.generateKeyPair();
         publicKey = keypair.getPublic();
         privateKey = keypair.getPrivate();
         pkcs10 = this.generatePKCS10(company, userId, country);

    }

    private byte[] generatePKCS10(String company, String userId, String country) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, SignatureException {
        String sigAlg = "SHA1withDSA";  
        String params = "CN=" + company + ", serialNumber=" + userId + ", C=" + country;
        X500Principal principal = new X500Principal(params);  

        PKCS10CertificationRequest kpGen = new PKCS10CertificationRequest(sigAlg, principal, publicKey, new DERSet(), privateKey, null);
        byte[] c = kpGen.getEncoded();
        return c;
    }

    public String getCSRasString() throws UnsupportedEncodingException {
        return new String(pkcs10, "ASCII"); // ISO-8859-1
    }

    public byte[] createHMacSeal(byte[] message, String key) throws UnsupportedEncodingException
    {
        hmac = new HMac(new SHA1Digest());
        hmacBytes = new byte[hmac.getMacSize()];
        {
            hmac.init(new KeyParameter(Hex.decode(key)));
            hmac.update(message, 0, message.length);
            hmac.doFinal(hmacBytes, 0);
        }
        return hmacBytes;
    }
}

我不确定的是,根据要求如何使PKCS请求DER编码？
另一个问题是如何给hmac密封一个DER编码的pkcs输入？最后如何获取生成的HMAC密封的字节数组,因为远程服务需要它作为base64编码的字节数组？

编辑

正如@Jcs指出我的PKCS创建是正确的但是现在我不确定正确的HMAC创建.我现在得到了来自远程服务器的响应,我现在得到的错误消息是error in MAC value.我目前的HMac创建方法如下:

public byte[] createHMacSeal(byte[] message, String key)  {
        String messageString = new String(message, "US-ASCII");
        HMac hmac = new HMac(new SHA1Digest());
        byte[] resBuf = new byte[hmac.getMacSize()];
        {
            byte[] m = messageString.getBytes();
            if (messageString.startsWith("0x"))
            {
                m = Hex.decode(messageString.substring(2));
            }
            hmac.init(new KeyParameter(key.getBytes("US-ASCII")));
            hmac.update(m, 0, m.length);
            hmac.doFinal(resBuf, 0);
            hmacBytes = resBuf;
        }
        return hmacBytes;

---

public byte[] createHMacSeal(byte[] message, String key) {
        SecretKey secretKey = new SecretKeySpec(key.getBytes("US-ASCII"), "HMac-SHA1");
        Mac mac;
        mac = Mac.getInstance("HMac-SHA1", "BC");
        mac.init(secretKey);
        mac.reset();
        mac.update(message, 0, message.length);
        hmacBytes = mac.doFinal();
        return hmacBytes;
    }

这两种方法为HMAC返回不同的值.对于方法,参数byte[] message是DER编码的PKCS getPKCS10(),第二个参数key是SMS激活代码,作为10个字符的字符串1234567890.现在我真的很震惊,并尝试了许多不同的可能性,但仍然是来自远程服务器的相同错误消息.

Answer 1

关于 PKCS#10 请求

首先，不用担心 PKCS#10 请求。它不包含私钥，仅包含主题名称和公钥。私钥仅用于签署请求。该签名是私钥拥有证明，即证明您确实拥有与请求中的公钥相对应的私钥。您构建 PKCS#10 请求的方式似乎不错。

关于 HMAC 印章

我认为这个印章用于通过共享秘密验证请求者的身份：短信激活码。我认为这是某种一次性密码。我不确定您是否必须对这段代码进行十六进制解码，我认为您应该将此代码用作 10 字节 ascii 编码字符串，即如果代码是0123456789HMAC 密钥，则为0x30313233343536373839。

关于算法

嗯...这仅取决于服务期望和/或允许的内容。DSA 仅用于签名，RSA 可用于签名和加密。