@dfinity/identity-secp256k1/lib/cjs/pem.js

JavaScript and TypeScript library to manage Secp256k1KeyIdentities for use with the Internet Computer

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.pemToSecretKey = pemToSecretKey;
const asn1js = __importStar(require("asn1js"));
const HEADER = `-----BEGIN EC PRIVATE KEY-----`;
const FOOTER = `-----END EC PRIVATE KEY-----`;
/**
 * Parse a PEM-encoded key into a Uint8Array
 * @param pem - the PEM-encoded key
 * @returns secret key as a Uint8Array
 */
function pemToSecretKey(pem) {
    const lines = pem.trim().split('\n');
    const header = lines[0].trim();
    const footer = lines[lines.length - 1].trim();
    if (lines.length < 3) {
        throw new Error('Invalid PEM format');
    }
    if (!header.startsWith(HEADER)) {
        throw new Error('Invalid PEM header');
    }
    if (!footer.startsWith(FOOTER)) {
        throw new Error('Invalid PEM footer');
    }
    const base64Data = lines.slice(1, -1).join('').replace(/\r?\n/g, '');
    const rawKey = Uint8Array.from(atob(base64Data), c => c.charCodeAt(0));
    // Parse the key as ASN.1 object
    try {
        const asn1 = asn1js.fromBER(rawKey);
        // OID for secp256k1
        if (!asn1.result.toString().includes(`OBJECT IDENTIFIER : 1.3.132.0.10`)) {
            throw new Error('Invalid curve, must be secp256k1');
        }
        // Returns the 32-byte raw private key at the appropriate offset
        return rawKey.slice(7, 39);
    }
    catch (error) {
        console.error(error);
        throw new Error('Encountered error while parsing PEM key');
    }
}
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