Paw dynamic value extension using ethereumjs-util to sign messages to be sent in HTTP requests.
To build and install from source, clone the repository and run the following commands.
$ git clone https://github.com/dworznik/paw-eth-sign-message.git
$ cd paw-eth-sign-message
$ NODE_ENV=production make install
Alternatively, download the latest build from the releases page, and extract it to Paw extensions directory.
Insert the dynamic value from the right-click menu: Extensions -> Ethereum Message Signature. Provide your private key in hex format and a message to be hashed and signed. You can choose whether the signature is prefixed with "0x" by checking the "0x Prefix" checkbox.