@oddjs/odd/lib/did/transformers.js

ODD SDK

import * as uint8arrays from "uint8arrays";
import { BASE58_DID_PREFIX, hasPrefix } from "./util.js";
/**
 * Convert a base64 public key to a DID (did:key).
 */
export function publicKeyToDid(crypto, publicKey, keyType) {
    // Prefix public-write key
    const prefix = crypto.did.keyTypes[keyType]?.magicBytes;
    if (prefix === null) {
        throw new Error(`Key type '${keyType}' not supported, available types: ${Object.keys(crypto.did.keyTypes).join(", ")}`);
    }
    const prefixedBuf = uint8arrays.concat([prefix, publicKey]);
    // Encode prefixed
    return BASE58_DID_PREFIX + uint8arrays.toString(prefixedBuf, "base58btc");
}
/**
 * Convert a DID (did:key) to a base64 public key.
 */
export function didToPublicKey(crypto, did) {
    if (!did.startsWith(BASE58_DID_PREFIX)) {
        throw new Error("Please use a base58-encoded DID formatted `did:key:z...`");
    }
    const didWithoutPrefix = did.substr(BASE58_DID_PREFIX.length);
    const magicalBuf = uint8arrays.fromString(didWithoutPrefix, "base58btc");
    const result = Object.entries(crypto.did.keyTypes).find(([_key, attr]) => hasPrefix(magicalBuf, attr.magicBytes));
    if (!result) {
        throw new Error("Unsupported key algorithm.");
    }
    return {
        publicKey: magicalBuf.slice(result[1].magicBytes.length),
        type: result[0]
    };
}
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