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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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