邮递员：使用SHA256和RSA的自定义签名请求

如何解决邮递员：使用SHA256和RSA的自定义签名请求

我编写了一个接口，以使用python向内部可听api发送请求。每个API请求都需要使用RSA SHA256签名。

现在，我想使用Postman测试API的端点，并使用预请求脚本功能。但是我对javascript不太了解。也许有人可以帮助我将以下python函数转换为Postman脚本：

def sign_request(
    request: httpx.Request,adp_token: str,private_key: str
) -> httpx.Request:
    """
    Helper function who creates a signed requests for authentication.

    :param request: The request to be signed
    :param adp_token: the token is obtained after register as device
    :param private_key: the rsa key obtained after register as device
    :returns: The signed request
    """
    method = request.method
    path = request.url.path
    query = request.url.query
    body = request.content.decode("utf-8")
    date = datetime.utcnow().isoformat("T") + "Z"

    if query:
        path += f"?{query}"

    data = f"{method}\n{path}\n{date}\n{body}\n{adp_token}"

    key = rsa.PrivateKey.load_pkcs1(private_key.encode())
    cipher = rsa.pkcs1.sign(data.encode(),key,"SHA-256")
    signed_encoded = base64.b64encode(cipher)

    signed_header = {
        "x-adp-token": adp_token,"x-adp-alg": "SHA256withRSA:1.0","x-adp-signature": f"{signed_encoded.decode()}:{date}"
    }
    request.headers.update(signed_header)

    return request

我发现了如何获取请求方法和主体。我可以获取路径并使用pm.request.url.getPathWithQuery()进行查询。要将标头添加到请求中，请使用pm.request.headers.add。

但是我不知道如何以等格式获取日期时间，连接字符串并签署数据。

解决方法

在Postman中进行此操作的问题在于，您只能使用sandbox中可用的那些软件包。因此，为此，您拥有crypto-js作为加密操作的唯一软件包助手。

var CryptoJS = require("crypto-js");
var moment = require("moment");

signRequest(pm.request,"yourAdpToken","yourPrivateKey")

function signRequest(request,adpToken,privateKey) {
    const method = request.method;
    const path = request.url.getPathWithQuery();
    const body = request.body.raw;
    const date = moment.utc().format();
    const data = `${method}\n${path}\n${date}\n${body}\n${adpToken}`
    const hash = CryptoJS.HmacSHA256(data,privateKey);
    const signedEncoded = CryptoJS.enc.Base64.stringify(hash);

    pm.request.headers.add({
        key: 'x-adp-token',value: adpToken
    });

    pm.request.headers.add({
        key: 'x-adp-alg',value: 'SHA256withRSA:1.0'
    });

    pm.request.headers.add({
        key: 'x-adp-signature',value: `${CryptoJS.enc.Base64.parse(signedEncoded)}:${date}`
    });
}

将以上内容添加到请求前脚本中，会将您需要的标头添加到请求中，如下所示：

您可能需要更改编码部分，检查encode options

,

我让它与pm lib一起运行。谢谢您的帮助。

唯一的问题是从env var获取包含换行符的私人证书，这些代码sig.init(privateKey);出错。我必须直接在预请求脚本中写私有证书字符串。

这是我的剧本。

eval( pm.globals.get('pmlib_code') );
var CryptoJS = require("crypto-js");
var moment = require("moment");

const adpToken = pm.environment.get("adp-token")
// private-key loaded from env var doesn't work because of newlines in it; bugfix
const privateKey = pm.environment.get("private-key")
// use private-key in pre request script directly make use of newline correctly
const privateKey2 = "-----BEGIN RSA PRIVATE KEY-----\nMIIE...==\n-----END RSA PRIVATE KEY-----\n"


signRequest(pm.request,privateKey);

function signRequest(request,privateKey2) {
    const method = request.method;
    const path = request.url.getPathWithQuery();
    const body = request.body || "";
    const date = moment.utc().format();
    const data = `${method}\n${path}\n${date}\n${body}\n${adpToken}`;
    var sig = new pmlib.rs.KJUR.crypto.Signature({"alg": "SHA256withRSA"});
    sig.init(privateKey);
    var hash = sig.signString(data);
    const signedEncoded = CryptoJS.enc.Base64.stringify(CryptoJS.enc.Hex.parse(hash));

    pm.request.headers.add({
        key: 'x-adp-token',value: `${signedEncoded}:${date}`
    });
}

更新：

现在从env var works中读取设备证书。我不得不将const privateKey = pm.environment.get("private-key")替换为const privateKey = pm.environment.get("private-key").replace(/\\n/g,"\n")

,

fwiw 使用“jsrsasign-js”库对 Adob​​e Experience Manager 的 JWT 令牌进行 RS256 签名

https://experience-aem.blogspot.com/2021/07/aem-cloud-service-get-adobe-ims-jwt-and-aem-access-token-using-post-man-aem-sso.html