Rsa

How signature verification bypass happens in Node.js crypto and how to fix it

A high-severity signature verification bypass was discovered in `apps/panel/panel.js` where the `JMkey` variable was passed directly to `Buffer.from(JMkey, 'hex')` without validating its format. An attacker could supply a malformed hex string to cause silent failures or unexpected behavior in the RSA-SHA256 verification process, potentially bypassing signature checks entirely. The fix adds strict hex format validation before processing.