如何获取SHA256证书指纹？

Question

如何获得证书的SHA256指纹？ SHA 256证书有两个指纹，我可以检索主指纹而不是SHA256。

Answer 1

public static String GetSha2Thumbprint(X509Certificate2 cert) 
     { 
      Byte[] hashBytes; 
      using (var hasher = new SHA256Managed()) 
      { 
       hashBytes = hasher.ComputeHash(cert.RawData); 
      } 
      string result = BitConverter.ToString(hashBytes) 
       // this will remove all the dashes in between each two haracters 
      .Replace("-", string.Empty).ToLower();   
      return result; 
     } 
After getting the Hashbytes , you have to do the bit convertion. 

此信息对我也有帮助。 Hashing text with SHA-256 at Windows Forms

Answer 2

如果你想获得证书的SHA256指纹，你必须做一些手动工作。内置Thumbprint属性仅为SHA1。

呦必须使用SHA256 class和计算散列以上证书的内容：

using System; 
using System.Linq; 
using System.Security.Cryptography; 
using System.Security.Cryptography.X509Certificates; 

namespace MyNamespace { 
    class MyClass { 
     public static String GetSha2Thumbprint(X509Certificate2 cert) { 
      Byte[] hashBytes; 
      using (var hasher = new SHA256Managed()) { 
       hashBytes = hasher.ComputeHash(cert.RawData); 
      } 
      return hashBytes.Aggregate(String.Empty, (str, hashByte) => str + hashByte.ToString("x2")); 
     } 
    } 
} 

，如有必要，你这个代码转换为一个扩展方法。