如何获取SHA-256证书指纹?

如果你想获得证书的SHA-256指纹,你必须做一些手工工作。内置的 Thumbprint 属性是 SHA-1 只有

你必须使用 SHA-256 class 并计算证书内容的哈希:

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"));
        }
    }
}

如果需要,可以将此代码转换为扩展方法。

使用:

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 characters
    .Replace("-", string.Empty).ToLower();
    return result;
}

得到哈希字节后,必须进行比特转换。

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