Linux 2.6 - man page for setkey (linux section 3posix)
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SETKEY(P) POSIX Programmer's Manual SETKEY(P)
setkey - set encoding key (CRYPT)
void setkey(const char *key);
The setkey() function provides access to an implementation-defined encoding algorithm. The
argument of setkey() is an array of length 64 bytes containing only the bytes with numeri-
cal value of 0 and 1. If this string is divided into groups of 8, the low-order bit in
each group is ignored; this gives a 56-bit key which is used by the algorithm. This is the
key that shall be used with the algorithm to encode a string block passed to encrypt().
The setkey() function shall not change the setting of errno if successful. An application
wishing to check for error situations should set errno to 0 before calling setkey(). If
errno is non-zero on return, an error has occurred.
The setkey() function need not be reentrant. A function that is not required to be reen-
trant is not required to be thread-safe.
No values are returned.
The setkey() function shall fail if:
ENOSYS The functionality is not supported on this implementation.
The following sections are informative.
Decoding need not be implemented in all environments. This is related to government
restrictions in some countries on encryption and decryption routines. Historical practice
has been to ship a different version of the encryption library without the decryption fea-
ture in the routines supplied. Thus the exported version of encrypt() does encoding but
crypt() , encrypt() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 SETKEY(P)
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