获取字符串的 SHA-256 字符串 [英] Obtain SHA-256 string of a string

问题描述

我有一些 string，我想使用 C# 用 SHA-256 散列函数散列它.我想要这样的东西:

I have some string and I want to hash it with the SHA-256 hash function using C#. I want something like this:

 string hashString = sha256_hash("samplestring");

框架中是否内置了一些东西来做到这一点?

Is there something built into the framework to do this?

推荐答案

实现可能是这样的

public static String sha256_hash(String value) {
  StringBuilder Sb = new StringBuilder();

  using (SHA256 hash = SHA256Managed.Create()) {
    Encoding enc = Encoding.UTF8;
    Byte[] result = hash.ComputeHash(enc.GetBytes(value));

    foreach (Byte b in result)
      Sb.Append(b.ToString("x2"));
  }

  return Sb.ToString();
}

Linq 实现更简洁，但可能可读性较差:

public static String sha256_hash(String value) {
  using (SHA256 hash = SHA256Managed.Create()) {
    return String.Concat(hash
      .ComputeHash(Encoding.UTF8.GetBytes(value))
      .Select(item => item.ToString("x2")));
  }
} 

编辑 2:.NET Core、.NET5、.NET6 ...

Edit 2: .NET Core , .NET5, .NET6 ...

public static String sha256_hash(string value)
{
    StringBuilder Sb = new StringBuilder();

    using (var hash = SHA256.Create())            
    {
        Encoding enc = Encoding.UTF8;
        byte[] result = hash.ComputeHash(enc.GetBytes(value));

        foreach (byte b in result)
            Sb.Append(b.ToString("x2"));
    }

    return Sb.ToString();
}

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