How to decrypt a file in UNIX?

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shishi_des

shishi_des(3)							      shishi							     shishi_des(3)

NAME

       shishi_des - API function

SYNOPSIS

       #include <shishi.h>

       int  shishi_des(Shishi * handle, int decryptp, const char key[8], const char iv[8], char * ivout[8], const char * in, size_t inlen, char **
       out);

ARGUMENTS

       Shishi * handle
		   shishi handle as allocated by shishi_init().

       int decryptp
		   0 to indicate encryption, non-0 to indicate decryption.

       const char key[8]

       const char iv[8]

       char * ivout[8]

       const char * in
		   input character array of data to encrypt/decrypt.

       size_t inlen
		   length of input character array of data to encrypt/decrypt.

       char ** out newly allocated character array with encrypted/decrypted data.

DESCRIPTION

       Encrypt or decrypt data (depending on decryptp) using DES in CBC mode.  The out buffer must be deallocated by the caller.

RETURN VALUE

       Returns SHISHI_OK iff successful.

REPORTING BUGS

       Report bugs to <bug-shishi@gnu.org>.

COPYRIGHT

       Copyright (C) 2002-2010 Simon Josefsson.
       Copying and distribution of this file, with or without modification, are permitted in any medium without  royalty  provided  the  copyright
       notice and this notice are preserved.

SEE ALSO

       The  full documentation for shishi is maintained as a Texinfo manual.  If the info and shishi programs are properly installed at your site,
       the command

	      info shishi

       should give you access to the complete manual.

shishi								       1.0.1							     shishi_des(3)

UNIX for Advanced & Expert Users