harden openssl verify, exec path and add regression tests

[pavankumar464]

No description provided.

[Copilot]

Pull request overview

This PR adds regression tests around openssl_verify_with_cert() input handling and hardens the exec() binding by avoiding shell invocation and rejecting unsafe commands.

Changes:

• Add a new GTest suite (openssl_verify_test) covering edge cases for openssl_verify_with_cert() and validating exec() rejection behavior.
• Replace exec() implementation from popen()/shell execution to fork() + execvp() with basic metacharacter filtering and argv parsing.
• Fix openssl_verify_with_cert() URI prefix checking to avoid out-of-bounds reads on short strings.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 9 comments.

File	Description
tests/openssl_verify_test.cpp	New regression tests for openssl_verify_with_cert() and exec() hardening behavior.
tests/CMakeLists.txt	Adds openssl_verify_test target and registers it with CTest/GTest discovery.
source/jst_functions.c	Hardens exec() implementation and fixes file:// prefix checking in openssl_verify_with_cert().

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