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# msgdigest

Purpose
Compute the message digest of a document.
Synopsis
`function msgdigest(mdalg:string, fname:string, mdf:string):integer`
`function msgdigest(fname:string, mdf:string):integer`
Arguments

mdalg | Name of the algorithm to use
fname | Name of the file to be processed
mdf | File where to store the digest

Return value
Size of the message digest in bytes or -1 if case of error.
Example
The following procedure implements the command 'md5sum':

    procedure md5sum(f:string)
     if msgdigest("md5",f,"mem:dgst")<>16 then
      writeln("Failed to compute digest")
     else
      fcopy("mem:dgst",F_BINARY,"hex:",F_TEXT)
      writeln("  ",f)
     end-if
    end-procedure

Further information
1. This function computes a message digest (MD) using either the algorithm specified by the mdalg argument or the default algorithm as defined by the control parameter ssl_digest. The produced output takes the form of a binary file the size of which is returned by the function.
2. The set of supported algorithms includes "md5", "sha", and "sha256". For a full list use the command mmssl list digest.
Related topics
sslmdsize
Module
mmssl
Parent Topic Procedures and functions

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