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Might a base64 encoded string contain whitespace? Specifically, could it contain whitespace at the end of the string?
PS. I’m thinking about the whole “MySQL will trim trailing whitespace when storing strings in VARCHAR fields” here 😉
No it can’t. See Base64 for the allowed character repository used by
base64, which are the charactersA-Z,a-z,0-9,+and/(the last two may differ depending on the implementation) as well as the padding character=(but that’s also implementation dependent as some implementations don’t use padding at all).