[R4R] - {0.4.2}: Resolve audit feedback from Sigma: MNT-9, MNT-10 and MNT-12

[abelliumnt]

Goals of PR

Core changes:

• Ensure key length is no less than 16
• Add Signature’s size verification

Notes:

• Write notes here

Related Issues:

• close [tsslib]Sigma audit feedback, MNT-12: Lack of Size Checks in createUUID() Function #1127
• close [tsslib]Sigma audit feedback, MNT-09: Lack Of Signature Size Verification Checks #1129
• close [tsslib]Sigma audit feedback, MNT-10: Incorrect Error Returned With Empty Signature #1130

[abelliumnt]

I have verified the PR in RDE