did-key-creator/lib/did_key_utils.js

This is a library for converting public keys to the did:key format

import * as u8a from "uint8arrays";
import multicodec from "multicodec";
import { base58btc } from "multiformats/bases/base58";
export function ECPointCompress(x, y) {
    const out = new Uint8Array(x.length + 1);
    out[0] = 2 + (y[y.length - 1] & 1);
    out.set(x, 1);
    return out;
}
export function compressedKeyInHexfromRaw(publicKeyHex) {
    const xHex = publicKeyHex.slice(0, publicKeyHex.length / 2);
    const yHex = publicKeyHex.slice(publicKeyHex.length / 2, publicKeyHex.length);
    const xOctet = u8a.fromString(xHex, "base16");
    const yOctet = u8a.fromString(yHex, "base16");
    const compressedPoint = ECPointCompress(xOctet, yOctet);
    const compressedPointHex = u8a.toString(compressedPoint, "base16");
    return compressedPointHex;
}
export function uncompressedKeyInHexfromRaw(publicKeyHex) {
    return "04" + publicKeyHex;
}
export function rawKeyInHexfromUncompressed(publicKeyHex) {
    return publicKeyHex.slice(2);
}
export function pubKeyHexToUint8Array(publicKeyHex) {
    if (publicKeyHex == null) {
        throw new TypeError("input cannot be null or undefined.");
    }
    if (publicKeyHex.length % 2 === 0) {
        return u8a.fromString(publicKeyHex, "base16");
    }
    else {
        return u8a.fromString("0" + publicKeyHex, "base16");
    }
}
export function didKeyIDtoPubKeyHex(didKeyID) {
    const buf = base58btc.decode(didKeyID);
    const bufwoPrefix = multicodec.rmPrefix(buf);
    return u8a.toString(bufwoPrefix, "base16");
}
export function didKeyURLtoPubKeyHex(didKeyURL) {
    const didKeyID = didKeyURL.split(":")[2];
    return didKeyIDtoPubKeyHex(didKeyID);
}
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