c# - 如何使用 .pem 文件中提供的公钥验证签名？

Question

如何使用 .pem 文件中提供的公钥验证签名？

我使用流动的代码：

RSACryptoServiceProvider CrRsa;

var reader21 = File.OpenText(@"C:GTLpublicKey.pem");
var x = new PemReader(reader21);
var y = (RsaKeyParameters)x.ReadObject();

CrRsa = (RSACryptoServiceProvider)RSACryptoServiceProvider.Create();
RSAParameters pa = new RSAParameters();
pa.Modulus = y.Modulus.ToByteArray();
pa.Exponent = y.Exponent.ToByteArray();
CrRsa.ImportParameters(pa);

y返回null，导致错误pa.Modulus = y.Modulus.ToByteArray();

Answer 1

RSACryptoServiceProvider RSAVerifier = new RSACryptoServiceProvider();

//Read public Key From Text File.

StreamReader PubKeyReader = File.OpenText(txtPublicKeyFile.Text);

string publicKey = PubKeyReader.ReadToEnd();

//Adding public key to RSACryptoServiceProvider object.

RSAVerifier.FromXmlString(publicKey);

//Reading the Signature to verify.

FileStream Signature = new FileStream(txtVerifySign.Text, FileMode.Open, FileAccess.Read);

BinaryReader SignatureReader = new BinaryReader(Signature);

byte[] SignatureData = SignatureReader.ReadBytes((int)Signature.Length);

//Reading the Signed File for Verification.

FileStream Verifyfile = new FileStream(txtVerifyFile.Text, FileMode.Open, FileAccess.Read);

BinaryReader VerifyFileReader = new BinaryReader(Verifyfile);

byte[] VerifyFileData = VerifyFileReader.ReadBytes((int)Verifyfile.Length);

//Comparing.

bool isValidsignature = RSAVerifier.VerifyData(VerifyFileData, "SHA1", SignatureData);

if (isValidsignature)

{

      Signature.Close();

      Verifyfile.Close();

}

else

{


    Signature.Close();

    Verifyfile.Close();

}

Answer 2

我不同意提出的答案。

RSACryptoServiceProvider 无法通过“FromXMLString”读取 PEM 文件。

但是，它给了我将 PEM 文件导出为 XML 的想法。

我找到了这个进行在线转换的网站

然后它完美地工作了！

Answer 3

不确定，但可能是您忘记了反斜杠的问题：

var reader21 = File.OpenText(@"C:\GTLpublicKey.pem");
//                               ^