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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "ENCRYPT" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" encrypt 
+.SH NAME
+encrypt \- encoding function (\fBCRYPT\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+void encrypt(char\fP \fIblock\fP\fB[64], int\fP \fIedflag\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIencrypt\fP() function shall provide access to an implementation-defined
+encoding algorithm. The key generated by \fIsetkey\fP() is used to
+encrypt the string \fIblock\fP with \fIencrypt\fP().
+.LP
+The \fIblock\fP argument to \fIencrypt\fP() shall be an array of length
+64 bytes containing only the bytes with values of 0
+and 1. The array is modified in place to a similar array using the
+key set by \fIsetkey\fP(). If \fIedflag\fP is 0, the argument is encoded.
+If \fIedflag\fP is 1, the argument
+may be decoded (see the APPLICATION USAGE section); if the argument
+is not decoded, \fIerrno\fP shall be set to [ENOSYS].
+.LP
+The \fIencrypt\fP() function shall not change the setting of \fIerrno\fP
+if successful. An application wishing to check for
+error situations should set \fIerrno\fP to 0 before calling \fIencrypt\fP().
+If \fIerrno\fP is non-zero on return, an error has
+occurred.
+.LP
+The \fIencrypt\fP() function need not be reentrant. A function that
+is not required to be reentrant is not required to be
+thread-safe.
+.SH RETURN VALUE
+.LP
+The \fIencrypt\fP() function shall not return a value.
+.SH ERRORS
+.LP
+The \fIencrypt\fP() function shall fail if:
+.TP 7
+.B ENOSYS
+The functionality is not supported on this implementation.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+Historical implementations of the \fIencrypt\fP() function used a
+rather primitive encoding algorithm.
+.LP
+In some environments, decoding might not be implemented. This is related
+to some Government restrictions on encryption and
+decryption routines. Historical practice has been to ship a different
+version of the encryption library without the decryption
+feature in the routines supplied. Thus the exported version of \fIencrypt\fP()
+does encoding but not decoding.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIcrypt\fP() , \fIsetkey\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<unistd.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .