Comment by userbinator

6 years ago

MD5 and all other hashes still take arbitrary bytes as input, so they wouldn't be the source of any restrictions; I suspect the majority of them are due to character set/encoding issues more than anything else.

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userbinator

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gruez  6 years ago

Presumably he's talking about code like this:

   $cursor.execute("SELECT * FROM users WHERE username = '$username' AND hash = MD5('password')")

Allowing any value would allow for SQL injections, so the programmer does the lazy thing and "sanitize" the inputs ($username/$password) with a roll-your-own "sanitizing" function that throws an error if there are "evil" characters.