epg-sign-string
epg-sign-string is a compiled Lisp function in `epg.el
'.
(epg-sign-string CONTEXT PLAIN &optional MODE)
Sign a string PLAIN and return the output as string.
If optional 3rd argument MODE is t or 'detached, it makes a detached signature.
If it is nil or 'normal, it makes a normal signature.
Otherwise, it makes a cleartext signature.