我需要使用我公司的数字证书签名并验证字符串. VerifyHash(hash,CryptoConfig.MapNameToOID(“ SHA1”),签名);部分返回false,因此出现“签名无效”错误.我究竟做错了什么？此错误最可能的原因是什么？

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;

namespace ConsoleApplication1
{
    class Program
    {
        static byte[] Sign(string text, string certSubject)
        {
            X509Store store = new X509Store(StoreName.My, StoreLocation.LocalMachine);
            X509Certificate2 myCert = null;
            RSACryptoServiceProvider provider = new RSACryptoServiceProvider();
            store.Open(OpenFlags.ReadOnly);
            foreach (X509Certificate2 cert in store.Certificates.Find(X509FindType.FindBySubjectName, certSubject, false))
            {
                myCert = cert;
                break;
            }
            store.Close();
            if (myCert == null)
            {
                throw new Exception("Certificate not found: " + certSubject, null);
            }
            // Hash the data
            SHA1Managed sha1 = new SHA1Managed();
            UnicodeEncoding encoding = new UnicodeEncoding();
            byte[] data = encoding.GetBytes(text);
            byte[] hash = sha1.ComputeHash(data);

            // Sign the hash
            return provider.SignHash(hash, CryptoConfig.MapNameToOID("SHA1"));
        }

        static bool Verify(string text, byte[] signature, string certPath)
        {
            // Load the certificate we'll use to verify the signature from a file 
            X509Certificate2 cert = new X509Certificate2(certPath);
            // Note: 
            // If we want to use the client cert in an ASP.NET app, we may use something like this instead:
            // X509Certificate2 cert = new X509Certificate2(Request.ClientCertificate.Certificate);

            // Get its associated CSP and public key
            RSACryptoServiceProvider csp = (RSACryptoServiceProvider)cert.PublicKey.Key;

            // Hash the data
            SHA1Managed sha1 = new SHA1Managed();
            UnicodeEncoding encoding = new UnicodeEncoding();
            byte[] data = encoding.GetBytes(text);
            byte[] hash = sha1.ComputeHash(data);

            // Verify the signature with the hash
            return csp.VerifyHash(hash, CryptoConfig.MapNameToOID("SHA1"), signature);
        }

        static void Main(string[] args)
        {
            // Usage sample
            try
            {
                // Sign text
                byte[] signature = Sign("Test 123", "Ross cert");

                // Verify signature. 
                if (Verify("Test 123", signature, @"C:\...RossTest.cer"))
                {
                    Console.WriteLine("SUCCESS! Signature verified");
                }
                else
                {
                    Console.WriteLine("ERROR: Signature not valid!");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("EXCEPTION: " + ex.Message);
            }
            Console.ReadKey();
        }
    }
}

解决方法:

我可以想象问题是在您的sign方法中,您花了很多精力来获取myCert,但后来却从未使用过它.您只需使用新创建的未初始化的RSACryptoServiceProvider对其进行签名.

我想象在store.Close()行之后,您需要类似以下内容的东西：

RSACryptoServiceProvider provider = (RSACryptoServiceProvider)cert.PrivateKey;