1Pal (1Password Auto Login) cydia tweak automatically enters your master password upon launching of the 1Password app.
1Pal is designed to be used in conjuction with many of the newer Touch ID-based application lockers (BioLockdown, BioProtect, etc) to allow you convenient, yet secure, access to your 1Password data.
Your password is securely stored within the iOS Keychain. It is not stored in plain-text anywhere on your filesystem.
To use, simply launch 1Password after installing 1Pal and enter your passcode. That’s it! From here on out, you will be logged into 1Password automatically. Should you wish to disable this feature, you can use the Clear Keychain option in Settings > 1Pal to permanently remove your passcode from the iOS Keychain.