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+       The MD5 module allows you to use the RSA Data Security
+       Inc. MD5 Message Digest algorithm from within Perl
+       programs.
+
+       A new MD5 context object is created with the new
+       operation.  Multiple simultaneous digest contexts can be
+       maintained, if desired.  The context is updated with the
+       add operation which adds the strings contained in the LIST
+       parameter. Note, however, that add('foo', 'bar'),
+       add('foo') followed by add('bar') and add('foobar') should
+       all give the same result.                        
+
+       The final message digest value is returned by the digest
+       operation as a 16-byte binary string. This operation
+       delivers the result of add operations since the last new
+       or reset operation. Note that the digest operation is
+       effectively a destructive, read-once operation. Once it
+       has been performed, the context must be reset before being
+       used to calculate another digest value.
+
+       Several convenience functions are also provided. The
+       addfile operation takes an open file-handle and reads it
+       until end-of file in 1024 byte blocks adding the contents
+       to the context. The file-handle can either be specified by
+       name or passed as a type-glob reference, as shown in the
+       examples below. The hexdigest operation calls digest and
+       returns the result as a printable string of hexdecimal
+       digits. This is exactly the same operation as performed by
+       the unpack operation in the examples below.
+
+       The hash operation can act as either a static member
+       function (ie you invoke it on the MD5 class as in the
+       synopsis above) or as a normal virtual function. In both        
+       cases it performs the complete MD5 cycle (reset, add,
+       digest) on the supplied scalar value. This is convenient
+       for handling small quantities of data. When invoked on the
+       class a temporary context is created. When invoked through
+       an already created context object, this context is used.
+       The latter form is slightly more efficient. The hexhash
+       operation is analogous to hexdigest.