Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
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...The simple yet effective encryption algorithm has a password hash, salt key and vigenère cipher key that are changed with every update. The only thing you have to do when updating is to delete the .tsf files and re-enter all your info again so that it can be encrypted using the new parameters.
Detailed How-To can be found in the project wiki.