[英]Generate X.509 certificate key pair and signing request (CSR) in C#
如何生成 X.509 公鑰和私鑰對以及要發送到 CA 以在 C# 中簽名的簽名請求(CSR 文件)?
生成 RSA 密鑰對很容易:
// Generate a 2048 bit RSA keypair
RSA keypair = new RSACryptoServiceProvider(2048);
不幸的是,.NET 不支持生成證書請求。 您最好的選擇可能是與 COM 組件CEnroll接口。 您應該使用CreatePKCS10方法。
如果您使用可以從Liping Dai 的網站獲得的 IAsn1Node 類,以下方法應該為您完成:
private static readonly Oid oidInstance = new Oid();
private static void AddSubjectString(IAsn1Node parent, string oid, string value)
{
if (!string.IsNullOrEmpty(value))
{
parent.AddChild(AddString(new Asn1Node
{
Tag = Asn1Tag.SET | Asn1TagClasses.CONSTRUCTED
},
oid, value));
}
}
private static Asn1Node AddString(Asn1Node parent, string name, string value)
{
var childNode = new Asn1Node
{
Tag = Asn1Tag.SEQUENCE | Asn1TagClasses.CONSTRUCTED
};
parent.AddChild(childNode);
var nameNode = new Asn1Node
{
Tag = Asn1Tag.OBJECT_IDENTIFIER,
Data = oidInstance.Encode(name)
};
childNode.AddChild(nameNode);
var valueNode = new Asn1Node();
if (value == null)
{
valueNode.Tag = Asn1Tag.TAG_NULL;
}
else
{
valueNode.Tag = Asn1Tag.PRINTABLE_STRING;
valueNode.Data = Encoding.ASCII.GetBytes(value);
}
childNode.AddChild(valueNode);
return parent;
}
public static void GenerateCsr(RSACryptoServiceProvider keyPair, Certificates.Subject subject, Stream output)
{
var rootNode = new Asn1Node
{
Tag = Asn1Tag.SEQUENCE | Asn1TagClasses.CONSTRUCTED
};
var topSequenceNode = new Asn1Node
{
Tag = Asn1Tag.SEQUENCE | Asn1TagClasses.CONSTRUCTED
};
rootNode.AddChild(topSequenceNode);
var versionNode = new Asn1Node
{
Tag = Asn1Tag.INTEGER,
Data = new byte[] { 0 }
};
topSequenceNode.AddChild(versionNode);
var stringSequenceNode = new Asn1Node
{
Tag = Asn1Tag.SEQUENCE | Asn1TagClasses.CONSTRUCTED
};
topSequenceNode.AddChild(stringSequenceNode);
AddSubjectString(stringSequenceNode, Oid.OID_COMMON_NAME, subject.CommonName);
AddSubjectString(stringSequenceNode, Oid.OID_ORGANIZATIONAL_UNIT, subject.OrganisationalUnit);
AddSubjectString(stringSequenceNode, Oid.OID_LOCALITY_NAME, subject.City);
AddSubjectString(stringSequenceNode, Oid.OID_COUNTRY_NAME, subject.Country);
AddSubjectString(stringSequenceNode, Oid.OID_PROVINCE_NAME, subject.Province);
AddSubjectString(stringSequenceNode, Oid.OID_ORGANIZATION, subject.Organisation);
AddSubjectString(stringSequenceNode, Oid.OID_EMAIL_ADDRESS, subject.EmailAddress);
var rsaNode = new Asn1Node
{
Tag = Asn1Tag.SEQUENCE | Asn1TagClasses.CONSTRUCTED
};
topSequenceNode.AddChild(AddString(rsaNode, Oid.OID_RSA_ENCRYPTION, null));
var publicKeyNode = new Asn1Node
{
Tag = Asn1Tag.BIT_STRING
};
rsaNode.AddChild(publicKeyNode);
var publicKeySequenceNode = new Asn1Node
{
Tag = Asn1Tag.SEQUENCE | Asn1TagClasses.CONSTRUCTED
};
publicKeyNode.AddChild(publicKeySequenceNode);
var publicKeyInfo = keyPair.ExportParameters(false);
publicKeySequenceNode.AddChild(new Asn1Node
{
Tag = Asn1Tag.INTEGER,
Data = publicKeyInfo.Modulus
});
publicKeySequenceNode.AddChild(new Asn1Node
{
Tag = Asn1Tag.INTEGER,
Data = publicKeyInfo.Exponent
});
topSequenceNode.AddChild(new Asn1Node
{
Tag = Asn1TagClasses.CONTEXT_SPECIFIC | Asn1TagClasses.CONSTRUCTED
});
byte[] signature;
using (var data = new MemoryStream(1024))
{
topSequenceNode.SaveData(data);
signature = keyPair.SignData(data.GetBuffer(), 0, (int)data.Length, new SHA1CryptoServiceProvider());
}
AddString(rootNode, Oid.OID_SHA1_WITH_RSA, null);
rootNode.AddChild(new Asn1Node
{
Tag = Asn1Tag.BIT_STRING,
Data = signature
});
var csrOutput = new StreamWriter(output);
csrOutput.WriteLine("-----BEGIN CERTIFICATE REQUEST-----");
using (var data = new MemoryStream(1024))
{
rootNode.SaveData(data);
var base64Data = Convert.ToBase64String(data.GetBuffer(), 0, (int)data.Length,
Base64FormattingOptions.InsertLineBreaks);
csrOutput.WriteLine(base64Data);
}
csrOutput.WriteLine("-----END CERTIFICATE REQUEST-----");
csrOutput.Flush();
}
感謝 Theodor 來拯救我們並為我們寫了它。
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