使用java从证书中读取私钥

import java.io.FileInputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.security.InvalidKeyException;  
import java.security.KeyStore;  
import java.security.KeyStoreException;  
import java.security.NoSuchAlgorithmException;  
import java.security.NoSuchProviderException;  
import java.security.PrivateKey;  
import java.security.SignatureException;  
import java.security.UnrecoverableKeyException;  
import java.security.cert.Certificate;  
import java.security.cert.CertificateException;  
import java.security.cert.CertificateFactory;  
 
public class KeyReader {  
 
    public static void main(String[] args) throws KeyStoreException,  
            NoSuchProviderException, NoSuchAlgorithmException,  
            CertificateException, IOException, UnrecoverableKeyException,  
            InvalidKeyException, SignatureException {  
 
        // Open an input stream on the keystore file  
        String cerFileName = "d:/certA.cer";  
        String p12FileName = "d:/certA.p12";  
        String pfxPassword = "openssl";  
 
        InputStream fis = new FileInputStream(p12FileName);  
 
        // Create a keystore object  
        KeyStore keyStore = KeyStore.getInstance("PKCS12", "BC");  
        // Load the file into the keystore  
        keyStore.load(fis, pfxPassword.toCharArray());  
 
        String aliaesName = "abcd";  
        PrivateKey priKey = (PrivateKey) (keyStore.getKey(aliaesName, null));  
        System.out.println("private key:/n" + priKey);  
 
        // public key  
        InputStream is = new FileInputStream(cerFileName);  
        CertificateFactory cf = CertificateFactory.getInstance("x509");  
        Certificate cerCert = cf.generateCertificate(is);  
        System.out.println("public key:/n" + cerCert);  
    }  

 

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