使用带有SHA256证书的ECDSA进行C#签名验证
我试图使用C#和内置的加密库来验证使用EC密钥+SHA256创建的签名。这是我正在做的 我已经使用openssl创建了私钥和相应的证书:使用带有SHA256证书的ECDSA进行C#签名验证,c#,cryptography,digital-signature,x509certificate2,ecdsa,C#,Cryptography,Digital Signature,X509certificate2,Ecdsa,我试图使用C#和内置的加密库来验证使用EC密钥+SHA256创建的签名。这是我正在做的 我已经使用openssl创建了私钥和相应的证书: $ openssl ecparam -genkey -name prime256v1 -out ca.key $ openssl req -x509 -new -SHA256 -nodes -key ca.key -days 36500 -out ca.crt 以下是我正在使用的钥匙(别担心,它们并不重要): 然后我有一个简单的数据文件,其中包含字符串“He
$ openssl ecparam -genkey -name prime256v1 -out ca.key
$ openssl req -x509 -new -SHA256 -nodes -key ca.key -days 36500 -out ca.crt
以下是我正在使用的钥匙(别担心,它们并不重要):
然后我有一个简单的数据文件,其中包含字符串“Hello”。然后,我使用openssl对该文件进行签名,如下所示:
$ openssl dgst -sha256 -sign ca.key data.txt > sig
$ base64 sig
MEUCIQD5593C/NBhHA1DILT72gjhGj/lKjom9vYP+JbuypBrxQIgNAjYT1LihEpPbUhe1n9ccUHQ
vw676bGqOTEU/25qcRQ=
using System;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
namespace security_sandbox
{
class Program
{
static void Main(string[] args)
{
var certData = Encoding.ASCII.GetBytes(
@"-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----");
var cert = new X509Certificate2(certData);
var ecdsa = cert.GetECDsaPublicKey();
var data = Encoding.ASCII.GetBytes("Hello");
var signature = Convert.FromBase64String("MEUCIQD5593C/NBhHA1DILT72gjhGj/lKjom9vYP+JbuypBrxQIgNAjYT1LihEpPbUhe1n9ccUHQvw676bGqOTEU/25qcRQ=");
var success = ecdsa.VerifyData(data, signature, HashAlgorithmName.SHA256);
if (success)
{
Console.WriteLine("Verified");
} else
{
Console.WriteLine("Failed");
}
}
}
}
然后,我可以通过首先从证书中提取公钥,然后使用公钥来验证签名:
$ openssl x509 -pubkey -noout -in ca.crt > ca.pub
$ cat ca.pub
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE7f1xwQL5m/UcN4zL+zsly6V1g3/w
NcL5TdCfWt0XfnUfg0x+RsIf1uerBnhrmhH0cN9o0xfXg5B3hURFlXVuEQ==
-----END PUBLIC KEY-----
$ openssl dgst -verify ca.pub -sha256 -signature sig data.txt
Verified OK
然后我尝试使用C#(.NETCore3.1)来验证签名。代码如下:
$ openssl dgst -sha256 -sign ca.key data.txt > sig
$ base64 sig
MEUCIQD5593C/NBhHA1DILT72gjhGj/lKjom9vYP+JbuypBrxQIgNAjYT1LihEpPbUhe1n9ccUHQ
vw676bGqOTEU/25qcRQ=
using System;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
namespace security_sandbox
{
class Program
{
static void Main(string[] args)
{
var certData = Encoding.ASCII.GetBytes(
@"-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----");
var cert = new X509Certificate2(certData);
var ecdsa = cert.GetECDsaPublicKey();
var data = Encoding.ASCII.GetBytes("Hello");
var signature = Convert.FromBase64String("MEUCIQD5593C/NBhHA1DILT72gjhGj/lKjom9vYP+JbuypBrxQIgNAjYT1LihEpPbUhe1n9ccUHQvw676bGqOTEU/25qcRQ=");
var success = ecdsa.VerifyData(data, signature, HashAlgorithmName.SHA256);
if (success)
{
Console.WriteLine("Verified");
} else
{
Console.WriteLine("Failed");
}
}
}
}
不幸的是,它总是无法通过验证。错误在哪里?事实证明,在.NET中缺少与PEM/OpenSSL兼容的操作工具非常令人沮丧。我最终使用加载证书或公钥,然后使用它来验证我的ASN签名。下面是一个完整的工作代码示例,演示如何使用证书和PEM公钥执行签名验证,以及如何使用ASN编码的签名
using System;
using System.IO;
using System.Text;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.OpenSsl;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;
namespace security_sandbox
{
class Program
{
static void Main(string[] args)
{
var certificateString = @"-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----";
var pemreader = new PemReader(new StringReader(certificateString));
var cert = (X509Certificate)pemreader.ReadObject();
// Alternatively, load the public key directly
var pubkeyString =
@"-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE7f1xwQL5m/UcN4zL+zsly6V1g3/w
NcL5TdCfWt0XfnUfg0x+RsIf1uerBnhrmhH0cN9o0xfXg5B3hURFlXVuEQ==
-----END PUBLIC KEY-----";
pemreader = new PemReader(new StringReader(pubkeyString));
var pubkey = (AsymmetricKeyParameter)pemreader.ReadObject();
var data = "Hello";
var signature = Convert.FromBase64String("MEUCIQD5593C/NBhHA1DILT72gjhGj/lKjom9vYP+JbuypBrxQIgNAjYT1LihEpPbUhe1n9ccUHQvw676bGqOTEU/25qcRQ=");
// Verify using the public key
var signer = SignerUtilities.GetSigner("SHA-256withECDSA");
signer.Init(false, pubkey);
signer.BlockUpdate(Encoding.ASCII.GetBytes(data), 0, data.Length);
var success = signer.VerifySignature(signature);
if (success) {
Console.WriteLine("Signature verified successfully using public key");
} else {
Console.WriteLine("Failed to verify signature using public key");
}
// Verify using the certificate - the certificate's public key is extracted using the GetPublicKey method.
signer.Init(false, cert.GetPublicKey());
signer.BlockUpdate(Encoding.ASCII.GetBytes(data), 0, data.Length);
success = signer.VerifySignature(signature);
if (success) {
Console.WriteLine("Signature verified successfully using certificate");
} else {
Console.WriteLine("Failed to verify signature using certificate");
}
}
}
}
签名有不同的格式。如果C代码中的签名以正确的格式传递,则验证成功,s。是的,提交的签名是ASN编码的。您必须使用ASN工具(没有内置的.NET)来提取签名的
r
和s
组件,规范化(删除前导零,如果有)并连接。然后根据连接的二进制字符串验证签名。如果使用.NET 5的预览版本(或者它是未来版本,并且.NET 5已经发布),则可以调用ecdsa.VerifyData(数据、签名、HashAlgorithmName.SHA256、DSASignatureFormat.Rfc3279DerSequence)
。