Function is_database_encrypted 

pub fn is_database_encrypted<P>(path: P) -> Result<bool, Error>
where
    P: AsRef<Path>,

Checks if a database file appears to be encrypted.

SQLCipher-encrypted databases have a different file header than plain SQLite. Plain SQLite databases start with “SQLite format 3\0” (16 bytes). Encrypted databases will have random-looking bytes at the start.

Arguments

• path - Path to the database file

Returns

• Ok(true) if the file exists and appears encrypted
• Ok(false) if the file exists and appears unencrypted (plain SQLite)
• Ok(false) if the file doesn’t exist (new database)
• Err if there’s an I/O error reading the file