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