Add support for encrypted cookies #93
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I'm proposing support for encrypted cookies in Express. I followed an approach similar to the cookie signing code. I created the package symmetric-cipher.js which has the encrypt and decrypt functionality. It uses symmetric encryption ('AES-256-CBC') and creates a sha256 hash of the key if the key length is not 32 bytes (256 bits). Encrypted cookies are also signed, to prevent wasting computing resources on a decryption attempt if the cookie has been tampered with. Encryption happens on top of JSON serialisation for JSON cookies so they should decrypt back to
j:. I have opened a PR to add encrypted cookie support to the main express library.I have also added the secretEncosing option so secrets can be used for encryption in encoding schemes like 'base64' and 'hex'. Since cookie-signature@1.0.6 only accepts UTF8 strings, the signing and unsigning is done using the secret as a UTF string, and then encryption and decryption use the specified encoding.