mirror of https://github.com/mkerrisk/man-pages
90 lines
3.1 KiB
Plaintext
90 lines
3.1 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "ENCRYPT" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" encrypt
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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.SH NAME
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encrypt \- encoding function (\fBCRYPT\fP)
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.SH SYNOPSIS
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.LP
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\fB#include <unistd.h>
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.br
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.sp
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void encrypt(char\fP \fIblock\fP\fB[64], int\fP \fIedflag\fP\fB);
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\fP
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\fB
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIencrypt\fP() function shall provide access to an implementation-defined
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encoding algorithm. The key generated by \fIsetkey\fP() is used to
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encrypt the string \fIblock\fP with \fIencrypt\fP().
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.LP
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The \fIblock\fP argument to \fIencrypt\fP() shall be an array of length
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64 bytes containing only the bytes with values of 0
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and 1. The array is modified in place to a similar array using the
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key set by \fIsetkey\fP(). If \fIedflag\fP is 0, the argument is encoded.
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If \fIedflag\fP is 1, the argument
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may be decoded (see the APPLICATION USAGE section); if the argument
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is not decoded, \fIerrno\fP shall be set to [ENOSYS].
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.LP
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The \fIencrypt\fP() function shall not change the setting of \fIerrno\fP
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if successful. An application wishing to check for
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error situations should set \fIerrno\fP to 0 before calling \fIencrypt\fP().
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If \fIerrno\fP is non-zero on return, an error has
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occurred.
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.LP
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The \fIencrypt\fP() function need not be reentrant. A function that
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is not required to be reentrant is not required to be
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thread-safe.
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.SH RETURN VALUE
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.LP
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The \fIencrypt\fP() function shall not return a value.
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.SH ERRORS
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.LP
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The \fIencrypt\fP() function shall fail if:
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.TP 7
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.B ENOSYS
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The functionality is not supported on this implementation.
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.sp
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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Historical implementations of the \fIencrypt\fP() function used a
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rather primitive encoding algorithm.
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.LP
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In some environments, decoding might not be implemented. This is related
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to some Government restrictions on encryption and
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decryption routines. Historical practice has been to ship a different
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version of the encryption library without the decryption
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feature in the routines supplied. Thus the exported version of \fIencrypt\fP()
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does encoding but not decoding.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIcrypt\fP(), \fIsetkey\fP(), the Base Definitions volume of
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IEEE\ Std\ 1003.1-2001, \fI<unistd.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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