Add utility to decrypt backups

sdk/src/bin/decrypt.rs

@@ -0,0 +1,21 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args = std::env::args().collect::<Vec<_>>();
+
+    if args.len() < 2 {
+        return Err(format!("Usage: {} <enrypted_file>", args[0]).into())
+    }
+
+    let path = &args[1];
+    let file = std::fs::read(path)?;
+
+    eprint!("Type encryption key followed by enter: ");
+
+    let mut buffer = String::new();
+    std::io::stdin().read_line(&mut buffer)?;
+    let buffer = buffer.trim();
+
+    let data = model::EncryptedBackupData::decrypt(&file, &buffer).map_err(|_| "Invalid key")?;
+    eprintln!("{:#?}", data);
+
+    Ok(())
+}