如何从JSON密钥生成jose4j EllipticCurveJsonWebKey

Question

我能够根据https://bitbucket.org/b_c/jose4j/wiki/JWT%20Examples创建JWE。Problem：无法使用json密钥创建JWE (如下面所述的EC类型)。

Requirement：创建并验证以下类型的JWE

  "typ": "JWT",
  "alg": "ECDH-ES+A256KW",
  "enc": "A128CBC-HS256",

我想避免EcJwkGenerator.generateJwk(EllipticCurves.P256);

EllipticCurveJsonWebKey senderJwk = EcJwkGenerator.generateJwk(EllipticCurves.P256);

我可以从json键创建EllipticCurveJsonWebKey吗？

这里是json web键：

{
  "kty":"EC",
  "d":"648B3L4cIM8oMDPshuo3jeV5nd8XjMp3bVDjMQgXqhE",
  "use":"enc",
  "crv":"P-256",
  "x":"w_UdBacxbKLLMbdvFaHWRK-O-GdnaBkRPtPaCQWcV44",
  "y":"tHYH0m2uHIFNotcTJxwDLyykUtVHHd8XSXlFwyxJXNQ"
}

Answer 1

https://bitbucket.org/b_c/jose4j/wiki/JWS%20Examples#markdown-header-using-the-rfc-7797-jws-unencoded-payload-option中的第一个例子是：

    // The public/private key pair for this example as a JWK
    PublicJsonWebKey jwk = PublicJsonWebKey.Factory.newPublicJwk("{" +
            "  \"kty\": \"EC\"," +
            "  \"d\": \"Tk7qzHNnSBMioAU7NwZ9JugFWmWbUCyzeBRjVcTp_so\"," +
            "  \"use\": \"sig\"," +
            "  \"crv\": \"P-256\"," +
            "  \"kid\": \"example\"," +
            "  \"x\": \"qqeGjWmYZU5M5bBrRw1zqZcbPunoFVxsfaa9JdA0R5I\"," +
            "  \"y\": \"wnoj0YjheNP80XYh1SEvz1-wnKByEoHvb6KrDcjMuWc\"" +
            "}"); 

我确实希望你发布的JWK只是一个例子。它有私钥，d参数，应该是私有的。