Function verifyHmacSignature

verifyHmacSignature(hmacKey: string, body: string, signature: string): boolean
Verify an HMAC-SHA256 signature from a request header.

Expects the signature header to be in one of these forms:
- Raw hex: a1b2c3...
- Prefixed: sha256=a1b2c3...
Parameters
- hmacKey: string
  Hex-encoded HMAC key.
- body: string
  The raw request body (string).
- signature: string
  The signature header value.
Returns boolean
true if the signature is valid.
Throws
If the signature is invalid.
Example
```
const sig = req.headers["x-hub-signature-256"] as string;
verifyHmacSignature(process.env.HMAC_KEY!, rawBody, sig);
// throws CryptoMiddlewareError if the signature is invalid
```
- Defined in common.ts:90