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msgsign

Purpose
Compute the digital signature of a document.
Synopsis
function msgsign(mdalg:string, pkey:string, fname:string, sgf:string):integer
function msgsign(fname:string, sgf:string):integer
Arguments
mdalg 
Name of the message digest algorithm to use
pkey 
Name of the private key file to use for signing
fname 
File to sign
sgf 
File where the signature is to be saved
Return value
Length of the signature or -1 in the case of an error.
Further information
1. This function computes the digital signature of a document by encrypting the message digest of its input file using an RSA private key. The resulting signature can be verified with the function msgverify used with the appropriate public key.
2. If no message digest algorithm is specified, the default algorithm defined by the control parameter ssl_digest is used. Unless a specific key file is selected, the default private key defined by the control parameter ssl_privkey or, (if this parameter is not defined) the key under getparam("ssl_dir")+"/personal.key" is used.
Related topics
msgverify
Module
mmssl

Parent Topic Procedures and functions

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