Java记录

1、由于公司需要，必须要在Java上运行些东西，以前看过Java但都差不多忘完了，所以安装一下Java记录一下，Java安装在C://Java文件夹里面的。配置的环境变量如下：
首先 下载JDK
然后如下图所示进行配置即可


成功后如下所示

2、将Java生成为Jar包在转为rsa.exe： (需要注意rsa.exe的jdk版本，服务器上配置的时候，一定要与生成的jdk版本保持一致)
jar->exe 博客文章
下载jar2exe
Java使用私钥文件对数据进行rsa解密
Java程序

//将私钥文件->私钥字符串
public static RSAPrivateKey getPrivateKey(String keyPath, String passwd) throws Exception {
    try {
            KeyStore ks = KeyStore.getInstance("PKCS12");
            FileInputStream fis = new FileInputStream(keyPath);
            
            char[] nPassword = null;
            if ((passwd == null) || passwd.trim().equals("")) {
                nPassword = null;
            } else {
                nPassword = passwd.toCharArray();
            }
            ks.load(fis, nPassword);
            fis.close();
            
            Enumeration enumq = ks.aliases();
            String keyAlias = null;
            if (enumq.hasMoreElements()) 
            {
                keyAlias = (String) enumq.nextElement();
            }
    
            PrivateKey prikey = (PrivateKey) ks.getKey(keyAlias, nPassword);
    
            return (RSAPrivateKey) prikey;
    } catch (Exception e) {
		e.printStackTrace();
        return null;
    }
}

//私钥解密
public static String decrypt(String sign_msg, String pfx_path, String pfx_pass) {
    try {
            RSAPrivateKey pbk = getPrivateKey(pfx_path, pfx_pass);
            
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
            cipher.init(Cipher.DECRYPT_MODE, pbk);
    
            byte[] btSrc = cipher.doFinal(Base64.decode(sign_msg));
            
            return new String(btSrc,ENCODING);

    } catch (Exception e) {
		e.printStackTrace();
        return "";
    }
}

//执行Main函数
public static void main(String[] args) throws Exception {
    //解密密钥
    String key_3des_enc = args[0];
    String pfx_path = args[1];
    String pfx_pass = args[2];
    
    String key_3des = RSA.decrypt(key_3des_enc,pfx_path,pfx_pass);
    System.out.println(key_3des);
}

C#程序

/// <summary>
/// 使用私钥解密出一个Java生成的随机密码，此处一般是3DES的加密密码，Base64字符串
/// </summary>
/// <param name="encryptString">要解密的字符串</param>
/// <param name="pfxPath">证书路径</param>
/// <param name="password">证书密码</param>
/// <returns></returns>
public static string DecryptRandKeyByPrivateKey(string encryptString,string pfxPath,string password)
{
    System.Diagnostics.Process p = new System.Diagnostics.Process();
    System.Diagnostics.ProcessStartInfo ps = new System.Diagnostics.ProcessStartInfo("rsa.exe");
    ps.Arguments = string.Format("{0} {1} {2}", encryptString, pfxPath, password);
    ps.RedirectStandardOutput = true;
    ps.UseShellExecute = false;
    p.StartInfo = ps;
    p.Start();
    return p.StandardOutput.ReadToEnd();
}