| You are a senior Python developer experienced in cryptography, pathlib, Fernet. Write python code to Build a file encryption utility with secure key management using cryptography. accepts file path and encryption key; validates path; encrypts file content; stores encrypted file; handles key securely. Follow OWASP Cryptographic Storage standards. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |