&#39；ASN1损坏数据。替换公钥而不是私钥时出错 [英] 'ASN1 corrupted data.' error when replacing public key but not private key

问题描述

学习使用RSA签名的机制，我有一段代码可以在下面运行。

var privateRSAKey = File.ReadAllText("RSAPrivateKey.txt").Trim();
Regex privateRSAKeyRegex = new Regex(@"-----(BEGIN|END) RSA PRIVATE KEY-----[W]*");
privateRSAKey = privateRSAKeyRegex.Replace(privateRSAKey, "");

//byte[602]
byte[] rsaPrivateKeyBytes = Convert.FromBase64String(privateRSAKey);

RSA rsa = RSA.Create();
rsa.ImportRSAPrivateKey(new ReadOnlySpan<byte>(rsaPrivateKeyBytes), out _);

但类似的块不适用于替换另一个RSA对象上的公钥。

publicRSAKey = File.ReadAllText("RSAPublicKey.txt").Trim(); 
Regex publicRSAKeyRegex = new Regex(@"-----(BEGIN|END) PUBLIC KEY-----[W]*");
publicRSAKey = publicRSAKeyRegex.Replace(publicRSAKey, "");

//byte[162]
byte[] rsaPublicKeyBytes = Convert.FromBase64String(publicRSAKey); 

RSA recipientRSA = RSA.Create(); 
recipientRSA.ImportRSAPublicKey(new ReadOnlySpan<byte>(rsaPublicKeyBytes), out _);

我只想用替换字符串文件中的公共rsa密钥，但收到错误

An unhandled exception of type 'System.Security.Cryptography.CryptographicException' occurred in System.Security.Cryptography.Algorithms.dll
ASN1 corrupted data.

推荐答案

我在发帖后发现了这个 https://vcsjones.dev/key-formats-dotnet-3/

To summarize each PEM label and API pairing:

"BEGIN RSA PRIVATE KEY" => RSA.ImportRSAPrivateKey
"BEGIN PRIVATE KEY" => RSA.ImportPkcs8PrivateKey
"BEGIN ENCRYPTED PRIVATE KEY" => RSA.ImportEncryptedPkcs8PrivateKey
"BEGIN RSA PUBLIC KEY" => RSA.ImportRSAPublicKey
"BEGIN PUBLIC KEY" => RSA.ImportSubjectPublicKeyInfo

我的问题是我的密钥格式为-----BEGIN PUBLIC KEY----- 我使用的是ImportRSAPublicKey。

我切换到.ImportSubjectPublicKeyInfo，一切正常

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