c# - .NET Core JWE：没有“cty”标头

Question

我正在使用以下代码来发布我的 JWE：

var signCreds = new SigningCredentials(new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration["Jwt:SigningKey"])), SecurityAlgorithms.HmacSha256);
var encryptionCreds = new EncryptingCredentials(new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration["Jwt:Encryptionkey"])), SecurityAlgorithms.Aes128KW, SecurityAlgorithms.Aes128CbcHmacSha256);

var handler = new JwtSecurityTokenHandler();


var jwtSecurityToken = handler.CreateJwtSecurityToken(
  Configuration["Jwt:Issuer"],
  Configuration["Jwt:Audience"],
  new ClaimsIdentity(claims),
  DateTime.UtcNow,
  expiresIn,
  DateTime.UtcNow,
  signCreds,
  encryptionCreds);

但它没有指定令牌的“cty”标头——只有 alg、enc 和 typ。如果我理解正确，则必须为加密的 JWT 设置标头，因此由于标头不存在，我在 golang 中解析令牌时遇到问题。

我还尝试了以下方式来发出 JWE：

var signCreds = new SigningCredentials(new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration["Jwt:SigningKey"])), SecurityAlgorithms.HmacSha256);
var encryptionCreds = new EncryptingCredentials(new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration["Jwt:Encryptionkey"])), SecurityAlgorithms.Aes128KW, SecurityAlgorithms.Aes128CbcHmacSha256);

var handler = new JwtSecurityTokenHandler();

var tokenDescriptor1 = new SecurityTokenDescriptor
  {
     Audience = "you",
     Issuer = "me",
     Subject = new ClaimsIdentity(claims),
     EncryptingCredentials = encryptionCreds
};

var tokenDescriptor2 = new SecurityTokenDescriptor
  {
     Audience = "you",
     Issuer = "me",
     Subject = new ClaimsIdentity(claims),
     EncryptingCredentials = encryptionCreds,
     SigningCredentials = signCreds
};

var tokenDescriptor3 = new SecurityTokenDescriptor
  {
     Audience = "you",
     Issuer = "me",
     Subject = new ClaimsIdentity(claims),
     EncryptingCredentials = encryptionCreds,
     SigningCredentials = signCreds,
     AdditionalHeaderClaims = new Dictionary<string, object> { { "cty", "JWT" } }
   };

var enc = handler.CreateEncodedJwt(tokenDescriptor1);
var encSigned = handler.CreateEncodedJwt(tokenDescriptor2);
var encSignedWithCty = handler.CreateEncodedJwt(tokenDescriptor3);

但结果相同：

我扫描了库，但没有找到为令牌设置 Cty 标头的代码。

也许有人知道我错过了什么或有什么问题？

谢谢！

Answer 1

好像是图书馆的问题