Function fnDsaVerify

fnDsaVerify(
    level: FnDsaLevel,
    publicKeyHex: string,
    messageHex: string,
    signatureHex: string,
): FnDsaVerifyResult
Verify an FN-DSA signature.
Parameters
- level: FnDsaLevel
  Security level: 512 or 1024.
- publicKeyHex: string
  Hex-encoded public key.
- messageHex: string
  Hex-encoded message that was signed.
- signatureHex: string
  Hex-encoded signature to verify.
Returns FnDsaVerifyResult
Verification result with validity flag.
Example
```
const kp = fnDsaKeygen(512);
const msg = Buffer.from("hello").toString("hex");
const sig = fnDsaSign(512, kp.secretKey, msg);
const result = fnDsaVerify(512, kp.publicKey, msg, sig.signature);
console.log(result.valid);  // true
```
- Defined in modern/fn-dsa.ts:195