@cocalc/backend/dist/sha1.js

CoCalc backend functionality: functionality used by either the hub, the next.js server or the project.

"use strict";
/*
sha1 hash functionality
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.uuidsha1 = exports.sha1 = void 0;
const crypto_1 = require("crypto");
// compute sha1 hash of data in hex
function sha1(data) {
    if (typeof data === "string") {
        // CRITICAL: Code below assumes data is a Buffer; it will seem to work on a string, but give
        // the wrong result where wrong means that it doesn't agree with the frontend version defined
        // in misc.
        data = Buffer.from(data);
    }
    const sha1sum = (0, crypto_1.createHash)("sha1");
    sha1sum.update(data);
    return sha1sum.digest("hex");
}
exports.sha1 = sha1;
// Compute a uuid v4 from the Sha-1 hash of data.
// Optionally, if knownSha1 is given, just uses that, rather than recomputing it.
function uuidsha1(data, knownSha1) {
    const s = knownSha1 ?? sha1(data);
    let i = -1;
    return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (c) => {
        i += 1;
        switch (c) {
            case "x":
                return s[i] ?? "0";
            case "y":
                // take 8 + low order 3 bits of hex number.
                return ((parseInt("0x" + s[i], 16) & 0x3) | 0x8).toString(16);
        }
        return "0";
    });
}
exports.uuidsha1 = uuidsha1;
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