projects / thirdparty / man-pages.git / blame
| Commit | Line | Data |
|---|---|---|
| fea681da MK |
1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| 2 | .\" | |
| 93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
| fea681da MK |
4 | .\" Permission is granted to make and distribute verbatim copies of this |
| 5 | .\" manual provided the copyright notice and this permission notice are | |
| 6 | .\" preserved on all copies. | |
| 7 | .\" | |
| 8 | .\" Permission is granted to copy and distribute modified versions of this | |
| 9 | .\" manual under the conditions for verbatim copying, provided that the | |
| 10 | .\" entire resulting derived work is distributed under the terms of a | |
| 11 | .\" permission notice identical to this one. | |
| c13182ef | 12 | .\" |
| fea681da MK |
13 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 15 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 16 | .\" the use of the information contained herein. The author(s) may not | |
| 17 | .\" have taken the same level of care in the production of this manual, | |
| 18 | .\" which is licensed free of charge, as they might when working | |
| 19 | .\" professionally. | |
| c13182ef | 20 | .\" |
| fea681da MK |
21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 22 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 4b72fb64 | 23 | .\" %%%LICENSE_END |
| fea681da MK |
24 | .\" |
| 25 | .\" References consulted: | |
| 26 | .\" Linux libc source code | |
| 27 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 28 | .\" 386BSD man pages | |
| 29 | .\" Modified Sat Jul 24 18:54:45 1993 by Rik Faith (faith@cs.unc.edu) | |
| fe0fefbf | 30 | .TH MEMFROB 3 2015-03-02 "GNU" "Linux Programmer's Manual" |
| fea681da MK |
31 | .SH NAME |
| 32 | memfrob \- frobnicate (encrypt) a memory area | |
| 33 | .SH SYNOPSIS | |
| 34 | .nf | |
| 86b91fdf | 35 | .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" |
| fea681da MK |
36 | .B #include <string.h> |
| 37 | .sp | |
| 38 | .BI "void *memfrob(void *" s ", size_t " n ); | |
| 39 | .fi | |
| 40 | .SH DESCRIPTION | |
| 60a90ecd MK |
41 | The |
| 42 | .BR memfrob () | |
| 43 | function encrypts the first \fIn\fP bytes of the | |
| fea681da | 44 | memory area \fIs\fP by exclusive-ORing each character with the number |
| 1c44bd5b | 45 | 42. |
| 60a90ecd MK |
46 | The effect can be reversed by using |
| 47 | .BR memfrob () | |
| 48 | on the | |
| fea681da MK |
49 | encrypted memory area. |
| 50 | .PP | |
| 51 | Note that this function is not a proper encryption routine as the XOR | |
| 33a0ccb2 | 52 | constant is fixed, and is suitable only for hiding strings. |
| 47297adb | 53 | .SH RETURN VALUE |
| 60a90ecd MK |
54 | The |
| 55 | .BR memfrob () | |
| 56 | function returns a pointer to the encrypted memory | |
| fea681da | 57 | area. |
| 60ca99ee | 58 | .SH ATTRIBUTES |
| c3b39c34 PH |
59 | For an explanation of the terms used in this section, see |
| 60 | .BR attributes (7). | |
| 61 | .TS | |
| 62 | allbox; | |
| 63 | lb lb lb | |
| 64 | l l l. | |
| 65 | Interface Attribute Value | |
| 66 | T{ | |
| 60ca99ee | 67 | .BR memfrob () |
| c3b39c34 PH |
68 | T} Thread safety MT-Safe |
| 69 | .TE | |
| 47297adb | 70 | .SH CONFORMING TO |
| 60a90ecd MK |
71 | The |
| 72 | .BR memfrob () | |
| 73 | function is unique to the | |
| fea681da | 74 | GNU C Library. |
| 47297adb | 75 | .SH SEE ALSO |
| fea681da | 76 | .BR strfry (3) |