带有ECC加密证书的签名令牌

问题描述

我正在使用自签名证书 ECDH_secP384r1 来签名令牌.这是我创建证书的PowerShell:

I'm using self signed certificate ECDH_secP384r1 for signing token.Here is the PowerShell that I create the certificate:

$Cert = New-SelfSignedCertificate -certstorelocation cert:\localmachine\my -dnsname $Certname -NotAfter $ExpireDate -KeyAlgorithm ECDH_secP384r1

现在，在我的.net核心应用程序中，我首先加载证书:

Now in my .net core application first I load the certificate:

private readonly string _certificateSubjectName;

public X509Certificate2 GetSigningCertificate()
{

    using (var store = new X509Store(StoreLocation.LocalMachine))
    {
        store.Open(OpenFlags.ReadOnly);
        var certificates = store.Certificates.Find(X509FindType.FindBySubjectName, _certificateSubjectName, false);
        return certificates[0];

    }
}

现在有了证书，我在创建SigningCredentials时出错:我试图按照这种方式遵循

Now by having the certificate I got an error in creating SigningCredentials:I tried to follow this way

public string GetSignedToken(IEnumerable<Claim> claims)
{
    var signingCertificate = GetSigningCertificate();
    byte[] certBytes = signingCertificate.Export(X509ContentType.Pkcs12);

    var privateECDsa = LoadPrivateKey(certBytes);
    var signingCredentials = new SigningCredentials(new ECDsaSecurityKey(privateECDsa), SecurityAlgorithms.EcdsaSha384);

    var token = new JwtSecurityToken(
                issuer: _issuer,
                audience: _audience,
                claims: claims,
                expires: DateTime.Now.AddMinutes(_expiryMinutes),
                signingCredentials: signingCredentials);

    var securityTokenHandler = new JwtSecurityTokenHandler();
    var rawJwtToken = securityTokenHandler.WriteToken(token);
    return rawJwtToken ;
}


private static ECDsa LoadPrivateKey(byte[] key)
{

    var privKeyInt = new Org.BouncyCastle.Math.BigInteger(+1, key);
    var parameters = SecNamedCurves.GetByName("secP384r1");
    var ecPoint = parameters.G.Multiply(privKeyInt);
    var privKeyX = ecPoint.Normalize().XCoord.ToBigInteger().ToByteArrayUnsigned();
    var privKeyY = ecPoint.Normalize().YCoord.ToBigInteger().ToByteArrayUnsigned();

    var curve = ECCurve.NamedCurves.nistP384;
    var d = privKeyInt.ToByteArrayUnsigned();
    var q = new ECPoint
    {
        X = privKeyX,
        Y = privKeyY
    };

    var eCParameters = new ECParameters
    {
        Curve = curve,
        D = d,
        Q = q
    };


    var eCDsa = ECDsa.Create(eCParameters); //In this line I got an exception
    return eCDsa;

}

但是我在ECDsa.Create中遇到了一个例外:

But I got an exception in ECDsa.Create:

The specified key parameters are not valid. Q.X and Q.Y are required fields. Q.X, Q.Y must be the same length. If D is specified it must be the same length as Q.X and Q.Y for named curves or the same length as Order for explicit curves.

更新:

我还尝试了这种固定尺寸的方法:

var d = FixSize(privKeyInt.ToByteArrayUnsigned(), privKeyX.Length);

但是在这种情况下 input [0]！= 0 我遇到了一个异常，我的 input [0] 不是0另外 input.Length 为1250，预期大小为48

but in this condition input[0] != 0 I got an exception, my input[0] is not 0Also the input.Length is 1250 and expected size is 48

我错过了什么?有什么想法.

What I missed? any idea please.

推荐答案

好吧，经过一番搜索，我发现一个简单的解决方案，我在这里将其作为答案:

Ok, after some search I found an easy solution, I put it as an answer here:

using System.Security.Cryptography.X509Certificates;

public string GetSignedToken(IEnumerable<Claim> claims)
{
    var signingCertificate = GetSigningCertificate();
    var securityKey = new ECDsaSecurityKey(signingCertificate.GetECDsaPrivateKey());
    var signingCredentials = new SigningCredentials(securityKey, SecurityAlgorithms.EcdsaSha384);

     var token = new JwtSecurityToken(
          issuer: _issuer,
          audience: _audience,
          claims: claims,
          expires: DateTime.Now.AddMinutes(_expiryMinutes),
          signingCredentials: signingCredentials);

    var securityTokenHandler = new JwtSecurityTokenHandler();
    var rawJwtToken = securityTokenHandler.WriteToken(token);

    return rawJwtToken;
}

并进行验证:

using System.Security.Cryptography.X509Certificates;

public TokenValidationParameters GetTokenValidationParameters()
{
    var signingCertificate = GetSigningCertificate();
    var securityKey = new ECDsaSecurityKey(signingCertificate.GetECDsaPublicKey());

    var validationParameters = new TokenValidationParameters()
    {
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = securityKey,
        ValidateIssuer = true,
        ValidIssuer = _issuer,
        ValidateAudience = true,
        ValidAudience = _audience
    };

    return validationParameters;
}

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