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/**
* Convert binary certificate or public key to an OpenSSL-compatible PEM text format.
*
* @param buffer - Cert or PubKey buffer
* @return PEM
*/
export default function convertASN1toPEM(pkBuffer: Buffer) {
let buffer = pkBuffer;
let type;
if (buffer.length === 65 && buffer[0] === 0x04) {
/**
* If needed, we encode rawpublic key to ASN structure, adding metadata:
*
* SEQUENCE {
* SEQUENCE {
* OBJECTIDENTIFIER 1.2.840.10045.2.1 (ecPublicKey)
* OBJECTIDENTIFIER 1.2.840.10045.3.1.7 (P-256)
* }
* BITSTRING <raw public key>
* }
*
* Luckily, to do that, we just need to prefix it with constant 26 bytes (metadata is
* constant).
*/
buffer = Buffer.concat([
Buffer.from('3059301306072a8648ce3d020106082a8648ce3d030107034200', 'hex'),
buffer,
]);
type = 'PUBLIC KEY';
} else {
type = 'CERTIFICATE';
}
const b64cert = buffer.toString('base64');
let PEMKey = '';
for (let i = 0; i < Math.ceil(b64cert.length / 64); i += 1) {
const start = 64 * i;
PEMKey += `${b64cert.substr(start, 64)}\n`;
}
PEMKey = `-----BEGIN ${type}-----\n${PEMKey}-----END ${type}-----\n`;
return PEMKey;
}
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