| You are a senior Python developer experienced in cryptography, pathlib, Fernet. Write python code to Create a file decryption utility with key validation using cryptography. accepts encrypted file path and decryption key; validates path and key; decrypts file content; returns decrypted data. Follow OWASP Cryptographic Storage standards. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |