@dfinity/identity-secp256k1
Version:
JavaScript and TypeScript library to manage Secp256k1KeyIdentities for use with the Internet Computer
39 lines • 1.39 kB
JavaScript
import * as asn1js from '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
*/
export 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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