.net 中的 JWT 生成和验证抛出“不支持密钥”

Question

我正在使用以下代码生成和验证 JWT。

static string GenerateToken()
{
    var tokenHandler = new JwtSecurityTokenHandler();
    var certificate = new X509Certificate2(@"Test.pfx", "123");
    var rsa = certificate.GetRSAPrivateKey();

    var tokenDescriptor = new SecurityTokenDescriptor
    {
        Subject = new ClaimsIdentity(),
        Issuer = "Self",
        IssuedAt = DateTime.Now,
        Audience = "Others",
        Expires = DateTime.MaxValue,
        SigningCredentials = new SigningCredentials(
            new RsaSecurityKey(rsa),
            SecurityAlgorithms.RsaSha256Signature)
    };

    var token = tokenHandler.CreateToken(tokenDescriptor);
    return tokenHandler.WriteToken(token);
}

static bool ValidateToken(string token)
{
    var tokenHandler = new JwtSecurityTokenHandler();
    var certificate = new X509Certificate2(@"Test.cer");
    var rsa = certificate.GetRSAPublicKey();

    var validationParameters = new TokenValidationParameters
    {
        ValidAudience = "Others",
        ValidIssuer = "Self",
        IssuerSigningKey = new RsaSecurityKey(rsa)
    };

    var principal = tokenHandler.ValidateToken(token, validationParameters, out SecurityToken securityToken);
    if (principal == null)
        return false;
    if (securityToken == null)
        return false;

    return true;
}

我在一个针对 .net 标准 2.0 和 net46 的库中有这段代码。

当我在 .net core app 2.0 项目中使用该库时，一切都按预期工作。我使用以下 nuget 包。

• System.IdentityModel.Tokens.Jwt => 5.1.4
• System.Security.Cryptography.Csp => 4.3.0

但是当我使用 .net46 构建相同的代码时，尝试生成令牌时出现以下异常。

var token = tokenHandler.CreateToken(tokenDescriptor);

System.NotSupportedException: 'NotSupported_Method'

当我尝试验证令牌时会引发以下异常。

var principal = tokenHandler.ValidateToken(token, validationParameters, out SecurityToken securityToken);

Microsoft.IdentityModel.Tokens.SecurityTokenInvalidSignatureException: 'IDX10503: 签名验证失败。尝试的键：'Microsoft.IdentityModel.Tokens.RsaSecurityKey，KeyId： '。

Answer 1

我现在直接使用X509SecurityKey，而不是使用RsaSecurityKey。这适用于 netstandard2.0 和 net46。

static string GenerateToken()
{
    var tokenHandler = new JwtSecurityTokenHandler();
    var certificate = new X509Certificate2(@"Test.pfx", "123");
    var securityKey = new X509SecurityKey(certificate);

    var tokenDescriptor = new SecurityTokenDescriptor
    {
        Subject = new ClaimsIdentity(),
        Issuer = "Self",
        IssuedAt = DateTime.Now,
        Audience = "Others",
        Expires = DateTime.MaxValue,
        SigningCredentials = new SigningCredentials(
            securityKey,
            SecurityAlgorithms.RsaSha256Signature)
    };

    var token = tokenHandler.CreateToken(tokenDescriptor);
    return tokenHandler.WriteToken(token);
}

static bool ValidateToken(string token)
{
    var tokenHandler = new JwtSecurityTokenHandler();
    var certificate = new X509Certificate2(@"Test.cer");
    var securityKey = new X509SecurityKey(certificate);

    var validationParameters = new TokenValidationParameters
    {
        ValidAudience = "Others",
        ValidIssuer = "Self",
        IssuerSigningKey = securityKey
    };

    var principal = tokenHandler.ValidateToken(token, validationParameters, out SecurityToken securityToken);
    if (principal == null)
        return false;
    if (securityToken == null)
        return false;

    return true;
}

另外我只需要System.IdentityModel.Tokens.Jwt nuget 包，可以删除System.Security.Cryptography.Csp 包。

Answer 2

谢谢你 NtFrex ..

我只是对 NtFrex 的答案进行了一些小改动，以使其对我有用。 这也适用于 .net 4.5.1，我认为它可能对某人有所帮助。这是最终代码，但首先要创建一个证书。我已经使用 openssl 用 RSA512 创建了一个。

创建令牌：

    private string GenerateToken1()
    {
        var tokenHandler = new JwtSecurityTokenHandler();
        var certificate = new X509Certificate2(@"C:\Users\myname\my-cert.pfx", "mypassword");
        var securityKey = new X509SecurityKey(certificate);

        var tokenDescriptor = new SecurityTokenDescriptor
        {
            Subject = new ClaimsIdentity(),
            Issuer = "Self",
            IssuedAt = DateTime.Now,
            Audience = "Others",
            Expires = DateTime.Now.AddMinutes(30),
            SigningCredentials = new SigningCredentials(
                securityKey,
                SecurityAlgorithms.RsaSha512Signature)
        };

        var token = tokenHandler.CreateToken(tokenDescriptor);
        return tokenHandler.WriteToken(token);
    }

验证令牌：

    private bool ValidateToken1(string token)
    {
        var tokenHandler = new JwtSecurityTokenHandler();
        var certificate = new X509Certificate2(@"C:\Users\myname\my-cert.pfx", "mypassword");
        var securityKey = new X509SecurityKey(certificate);

        var validationParameters = new TokenValidationParameters
        {
            ValidAudience = "Others",
            ValidIssuer = "Self",
            IssuerSigningKey = securityKey
        };

        SecurityToken securityToken;
        var principal = tokenHandler.ValidateToken(token, validationParameters, out securityToken);
        if (principal == null)
            return false;
        if (securityToken == null)
            return false;

        return true;
    }