Question

我尝试了波纹管代码来创建RSA-OAEP和A128GCM JWE生成器和验证器。它适用于节点js，即加密声明并生成jwe并解密它同样给我声明。但它不与其他客户合作，如nimbusds jose，jose4j。所以我肯定错过了一些东西。

我是通过阅读https://tools.ietf.org/html/rfc7516

来做到这一点的

index.js

var crypto = require('crypto');
var randomstring = require("randomstring");
var ursa = require("ursa");
var fs = require("fs");
var base64url = require('base64url');
var ascii = require("./ASCII");


var claims = {
    firstName: "vimal"
};

var header = {
    "enc": "A128GCM",
    "alg": "RSA-OAEP"
};

var headerBase64Url = base64url.encode(JSON.stringify(header));
console.log("headerBase64Url : " + headerBase64Url);
console.log("headerBase64Url to UTF8 : " + base64url.decode(headerBase64Url));


var cek = randomstring.generate(16);
console.log("cek : " + cek);

var publicKey = ursa.createPublicKey(fs.readFileSync('./pubkey.pem'));
var encryptedKey = publicKey.encrypt(cek, 'utf8', 'base64');
console.log("encryptedKey : " + encryptedKey);

// var privateKey = ursa.createPrivateKey(fs.readFileSync('./privkey.pkc8.pem'));
// var decryptedKey = privateKey.decrypt(encryptedKey, "hex", "utf8");

// console.log("decryptedKey : " + decryptedKey);


var iv = randomstring.generate(12);
console.log("IV : " + iv);
var cipher = crypto.createCipheriv('aes-128-gcm', cek, iv);
cipher.setAAD(Buffer.from(ascii.toASCII(headerBase64Url)));
var chipherText = cipher.update(JSON.stringify(claims), "utf8", "base64");
chipherText += cipher.final('base64');
console.log("chipherText : " + chipherText);
var chipherTextAuthTag = cipher.getAuthTag().toString("base64");
console.log("chipherText Auth Tag : " + chipherTextAuthTag);


var jweToken = headerBase64Url + "." + base64url.encode(encryptedKey, "base64") + "." + base64url.encode(iv, "base64") + "." + base64url.encode(chipherText, "base64") +
    "." + base64url.encode(chipherTextAuthTag, "base64");
console.log("jweToken : " + jweToken);


// decrypt

var jweTokenParts = jweToken.split(".");

var headerHex = base64url.decode(jweTokenParts[0]);
console.log(headerHex);
var encryptedKeyHex = base64url.decode(jweTokenParts[1], "base64");
console.log(encryptedKeyHex);
var ivHex = base64url.decode(jweTokenParts[2], "base64");
console.log(ivHex);
var chipperTextHex = base64url.decode(jweTokenParts[3], "base64");
console.log(chipperTextHex);
var chipherTextAuthTagHex = base64url.decode(jweTokenParts[4], "base64");
console.log(chipherTextAuthTagHex);


var privateKey = ursa.createPrivateKey(fs.readFileSync('./privkey.pkc8.pem'));
var decryptedKeyHex = privateKey.decrypt(encryptedKeyHex, "base64", "utf8");

console.log("decryptedKeyHex : " + decryptedKeyHex);

var dcipher = crypto.createDecipheriv('aes-128-gcm', decryptedKeyHex, iv);
dcipher.setAAD(Buffer.from(ascii.toASCII(jweTokenParts[0])));
dcipher.setAuthTag(Buffer.from(chipherTextAuthTagHex, "base64"));
var planText = dcipher.update(chipperTextHex, "base64", "utf8");
planText += dcipher.final('utf8');
console.log(planText);

ASCII.js

function toASCII(text) {
    var ascii = "";
    for (var f in text) {
        ascii = ascii + text.charCodeAt(f);
    }

    return ascii;
}

module.exports = {
    toASCII: toASCII
};

使用以下命令生成公钥和私钥

openssl genrsa -out ./privkey.pem 2048

openssl pkcs8 -topk8 -inform pem -in ./privkey.pem -outform pem -nocrypt -out ./privkey.pkc8.pem

openssl rsa -in ./privkey.pkc8.pem -poutout -out ./pubkey.pem

请帮我修复此代码。

这是我的公钥

生成JWE

eyJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiUlNBLU9BRVAifQ.A_KMJqfr6FZSoejRGWPsZKMCNZmPyaWoNvpG6KMRpqyv7Alb8Ui5ELWLjpcaemjNM8EFU8d4-Yzz8jRRZ5TpK2pEEc4NXfDLcnj2b0-38_-P-0HbW1YyMkkGMVXIpJDYMo8vKgVHIBj0pNlzgF7xmxLFWZlJlXmYzXi4QZcig5HezHg7AAQB7U2HYry25cQDYam60747gRCH372NaSm_dfRCNvH8copVXqiJGNs6xhslxMt_LopnZt9iIcAC9o7m0FPdnu_0Ui_w0jp5OUam8i0v8k6SSajBvXSedtUENxcehPGRSFYzi8KqZ53u4CpRygir84wNFRTi7zmLV6TlVw.84xgyx6TTI8I.4zTt1fI1XCbvxW2L-pH8_Mfp_ySF.EPmpEHiMYAvA2nqz9M0v5Q

Answer 1

看起来使用Base64 Url无法正确编码IV。在我的计算机上，当我执行以下代码行时：

console.log(iv);
console.log(base64url.encode(iv, "base64"));

然后两条线是相同的。当我修改你的代码时：

var jweToken = headerBase64Url + "." + base64url.encode(encryptedKey, "base64") + "." + base64url.encode(iv, "base64") + "." + base64url.encode(chipherText, "base64") +
"." + base64url.encode(chipherTextAuthTag, "base64");

这些行：

var bufferedIV = new Buffer(iv);
var jweToken = headerBase64Url + "." + base64url.encode(encryptedKey, "base64") + "." + base64url.encode(bufferedIV, "base64") + "." + base64url.encode(chipherText, "base64") +
"." + base64url.encode(chipherTextAuthTag, "base64");

然后它工作正常;我可以使用我的PHP库加载生成的JWE。

根据我的理解，错误来自base64url依赖，它不能正确编码IV。

如何在节点js中生成和验证JWE？

1 个答案: