Manual Pages for UNIX Operating System command usage for man isencrypt

String Pattern-Matching Library Functions         isencrypt(3GEN)



NAME
     isencrypt - determine whether  a  buffer  of  characters  is
     encrypted

SYNOPSIS
     cc  [flag]... [file]... -lgen [library]...


     #include

     int isencrypt(const char *fbuf, size_t ninbuf);


DESCRIPTION
     isencrypt() uses heuristics to determine whether a buffer of
     characters  is  encrypted.  It  requires  two  arguments:  a
     pointer to an array of characters and the number of  charac-
     ters in the buffer.


     isencrypt() assumes that the file is not  encrypted  if  all
     the  characters  in the first block are ASCII characters. If
     there are non-ASCII characters in the first  ninbuf  charac-
     ters,  and  if the setlocale() LC_CTYPE category is set to C
     or ascii, isencrypt() assumes that the buffer is encrypted


     If the LC_CTYPE category is set to a value other than  C  or
     ascii,  then isencrypt() uses a combination of heuristics to
     determine if the buffer is encrypted. If ninbuf has at least
     64 characters, a chi-square test is used to determine if the
     bytes in the buffer have a uniform distribution; if it does,
     then  isencrypt()  assumes  the buffer is encrypted.  If the
     buffer has less than 64 characters, a check is made for null
     characters  and a terminating  new-line to determine whether
     the buffer is encrypted.

RETURN VALUES
     If the buffer is encrypted,  1 is returned; otherwise,  zero
     is returned.

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:











SunOS 5.11          Last change: 29 Dec 1996                    1






String Pattern-Matching Library Functions         isencrypt(3GEN)



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|


SEE ALSO
     setlocale(3C), attributes(5)

NOTES
     When compiling multithreaded  applications,  the  _REENTRANT
     flag  must be defined on the compile line.  This flag should
     only be used in multithreaded applications.









































SunOS 5.11          Last change: 29 Dec 1996                    2