filemd5 Function

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filemd5 is a variant of md5 that hashes the contents of a given file rather than a literal string.

This is similar to md5(file(filename)), but because file accepts only UTF-8 text it cannot be used to create hashes for binary files.

Collision attacks have been successfully performed against this hashing function. Before using this function for anything security-sensitive, refer to RFC 6151 for updated security considerations applying to the MD5 algorithm.