Files
zod-backend/src/auth/utils/crypt.ts
2024-12-05 11:20:50 +03:00

27 lines
735 B
TypeScript

import * as crypto from 'crypto';
export function verifySignature(
publicKeyBase64: string,
signatureBase64: string,
message: string,
algorithm: 'SHA1' | 'SHA384',
) {
const signatureBuffer = Buffer.from(signatureBase64, 'base64');
const publicKeyPEM = '-----BEGIN PUBLIC KEY-----\n' + publicKeyBase64 + '\n-----END PUBLIC KEY-----';
const verifier = crypto.createVerify(algorithm);
verifier.update(message, 'utf8');
return verifier.verify(
{
key: publicKeyPEM,
padding: crypto.constants.RSA_PKCS1_PADDING,
},
signatureBuffer,
);
}
export function removePadding(originalSignature: string) {
const buffer = Buffer.from(originalSignature, 'base64');
return buffer.toString('base64');
}