为什么在使用RSA签名时使用SHA256和无效的哈希算法? [英] Why is SHA256 and invalid hash algorithm when signing with RSA?

问题描述

我正在尝试使用以下方法对流进行签名，但是我总是收到一个加密异常，即使该文档中列出了它，它也不是有效的哈希算法:

I am trying to sign a stream using the method below but I always get a Cryptographic Exception saying that it is not a valid hash algorithm even though it is listed in the documentation:

byte[] SignData(RSACryptoServiceProvider rsa, Stream stream, string hashName)
{
    HashAlgorithm hash = HashAlgorithm.Create(hashName);
    byte[] signature = rsa.SignData(stream, hash);
    return signature;
}

我使用"SHA256"作为hashName参数来调用它.并且在调用rsa.SignData()的行上引发了异常.

I am calling it with "SHA256" as the hashName parameter. and the exception is thrown at the line where rsa.SignData() is called.

这不是使用X509证书，不是重复的.顺便说一句，请参阅下面的答案.

This is NOT using X509 certificates, it is not a duplicate. BTW see answer below.

推荐答案

只需解决，并且它不是重复的，因为我使用的是.NET的普通 RSACryptoServiceProvider 和不是X509证书.

Just resolved and it is not a duplicate because I am using the plain RSACryptoServiceProvider of .NET and not X509 certificates.

我遇到了这个帖子: http://hintdesk.com/c-how-to-fix-invalid-algorithm-specified-when-signing-with-sha256/

I ran into this post: http://hintdesk.com/c-how-to-fix-invalid-algorithm-specified-when-signing-with-sha256/

在阅读它时，我想到要检查一下RSA SignatureAlgorithm，它得到的URI表明它是 SHA1 ，因此没有SHA256或SHA512.然后我在MSDN文档中查询了该属性，并说该属性总是返回该值，因为它仅支持该值，因此仅 SHA1 .

Reading it it occurred to me to to examine the RSA SignatureAlgorithm and it the resulting URI indicated it was SHA1 so no SHA256 or SHA512. Then I looked up that property in MSDN documentation and it says that property always returns that value because it only supports that, so only SHA1.

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