/
index.js
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/
index.js
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const jsonld = require("jsonld");
const crypto = require("crypto");
const canonize = async data => {
return jsonld.canonize(data);
};
const sha256 = data => {
const h = crypto.createHash("sha256");
h.update(data);
return h.digest("hex");
};
const cannonizeSignatureOptions = signatureOptions => {
let _signatureOptions = {
...signatureOptions,
"@context": "https://w3id.org/security/v2"
};
delete _signatureOptions.jws;
delete _signatureOptions.signatureValue;
delete _signatureOptions.proofValue;
return canonize(_signatureOptions);
};
const cannonizeDocument = doc => {
let _doc = { ...doc };
delete _doc["proof"];
return canonize(_doc);
};
const createVerifyData = async (data, signatureOptions) => {
if (signatureOptions.creator) {
signatureOptions.verificationMethod = signatureOptions.creator;
}
if (!signatureOptions.verificationMethod) {
throw new Error("signatureOptions.verificationMethod is required");
}
if (!signatureOptions.created) {
signatureOptions.created = new Date().toISOString();
}
if (!signatureOptions.type === "Ed25519Signature2018") {
signatureOptions.type = "Ed25519Signature2018";
}
const [expanded] = await jsonld.expand(data);
const framed = await jsonld.compact(
expanded,
"https://w3id.org/security/v2",
{ skipExpansion: true }
);
const cannonizedSignatureOptions = await cannonizeSignatureOptions(
signatureOptions
);
const hashOfCannonizedSignatureOptions = sha256(cannonizedSignatureOptions);
const cannonizedDocument = await cannonizeDocument(framed);
const hashOfCannonizedDocument = sha256(cannonizedDocument);
return {
framed,
verifyDataHexString:
hashOfCannonizedSignatureOptions + hashOfCannonizedDocument
};
};
module.exports = createVerifyData;