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Using crow::utility::base64encode(mystring, mystring.size()) will return a Base64 encoded string. For URL safe Base64 crow::utility::base64encode_urlsafe(mystring, mystring.size()) can be used. The key used in the encoding process can be changed, it is a string containing all 64 characters to be used.



Using crow::utility::base64decode(mystring, mystring.size()) with mystring being a Base64 encoded string will return a plain-text string. The function works with both normal and URL safe Base64. However it cannot decode a Base64 string encoded with a custom key.