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MD5, MD5Init, MD5Transform - message digest routines
MD5Transform(u_int32_t buf, const unsigned char block);
The MD5 module implements the RSA Data Security, Inc. MD5 Message-Digest
Algorithm (MD5). It produces 128-bit MD5 Digest of data.
MD5Init must be called just before MD5Transform() will be used
to produce a digest. The buf argument is the storage
for the digest being produced on subsequent calls to the
MD5Transform is the core of the MD5 algorithm, this alters an
existing MD5 hash kept in buf to reflect the addition of
64 characters of new data passed in block argument.
The code for MD5 transform was taken from Colin Plumb’s implementation,
which has been placed in the public domain. The MD5 cryptographic
checksum was devised by Ronald Rivest, and is documented in RFC 1321,
"The MD5 Message Digest Algorithm".