encrypt, setkey, encrypt_r, setkey_r − encrypt 64-bit messages
_XOPEN_SOURCE /* See feature_test_macros(7) */
void encrypt(char block, int edflag);
_XOPEN_SOURCE /* See feature_test_macros(7) */
void setkey(const char *key);
_GNU_SOURCE /* See feature_test_macros(7) */
setkey_r(const char *key, struct crypt_data
void encrypt_r(char *block, int edflag, struct crypt_data *data);
Each of these requires linking with −lcrypt.
These functions encrypt and decrypt 64-bit messages. The setkey() function sets the key used by encrypt(). The key argument used here is an array of 64 bytes, each of which has numerical value 1 or 0. The bytes key[n] where n=8*i-1 are ignored, so that the effective key length is 56 bits.
The encrypt() function modifies the passed buffer, encoding if edflag is 0, and decoding if 1 is being passed. Like the key argument, also block is a bit vector representation of the actual value that is encoded. The result is returned in that same vector.
These two functions are not reentrant, that is, the key data is kept in static storage. The functions setkey_r() and encrypt_r() are the reentrant versions. They use the following structure to hold the key data:
char keysched[16 * 8];
long int current_saltbits;
Before calling setkey_r() set data−>initialized to zero.
These functions do not return any value.
Set errno to zero before calling the above functions. On success, it is unchanged.
The function is not provided. (For example because of former USA export restrictions.)
The encrypt() and setkey() functions are not thread-safe.
The encrypt_r() and setkey_r() functions are thread-safe.
The functions encrypt() and setkey() conform to SVr4, SUSv2, and POSIX.1-2001. The functions encrypt_r() and setkey_r() are GNU extensions.
In glibc 2.2 these functions use the DES algorithm.
You need to link with libcrypt to compile this example with glibc. To do useful work the key and txt arrays must be filled with a useful bit pattern.
char key; /* bit pattern for key */
char txt; /* bit pattern for messages */
encrypt(txt, 0); /* encode */
encrypt(txt, 1); /* decode */
This page is part of release 3.69 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man−pages/.
More Linux Commands
ccoshl(3) - complex hyperbolic cosine - Linux manual page...
The complex hyperbolic cosine function is defined as: ccosh(z) = (exp(z)+exp(-z))/2 VERSIONS These functions first appeared in glibc in version 2.1. CONFORMING
unstr(1) create a random access file for storing strings br
strfile reads a file containing groups of lines separated by a line containing a single percent % sign (or other specified delimiter character) and creates a da
Tcl_ChannelSetOptionProc(3) - procedures for creating and ma
Tcl uses a two-layered channel architecture. It provides a generic upper layer to enable C and Tcl programs to perform input and output using the same APIs for
wait(2) - wait for process to change state - Linux man page
All of these system calls are used to wait for state changes in a child of the calling process, and obtain information about the child whose state has changed.
SDL_JoystickGetButton(3) - Get the current state of a given
SDL_JoystickGetButton returns the current state of the given button on the given joystick. RETURN VALUE 1 if the button is pressed. Otherwise, 0. SEE ALSO SDL_J
rpmdeps(8) - Generate RPM Package Dependencies (Man Page)...
rpmdeps generates package dependencies for the set of FILE arguments. Each FILE argument is searched for Elf32/Elf64, script interpreter, or per-script dependen
XML::PatAct::MatchName(3pm) - A pattern module for matching
XML::PatAct::MatchName is a pattern module for use with PatAct drivers for applying pattern-action lists to XML parses or trees. XML::PatAct::MatchName is a sim
regtree(1) Textmode registry viewer - Linux manual page.....
The regtree utility prints out all the contents of a Windows registry file. Subkeys are printed with one level more indentation than their parents. OPTIONS --he
XListPixmapFormats(3) - image format functions and macros...
The XListPixmapFormats function returns an array of XPixmapFormatValues structures that describe the types of Z format images supported by the specified display
isprint_l(3) character classification functions (Man Page)
These functions check whether c, which must have the value of an unsigned char or EOF, falls into a certain character class according to the specified locale. T
logger(1) - a shell command interface to the syslog(3) syste
logger makes entries in the system log. It provides a shell command interface to the syslog(3) system log module. OPTIONS -d, --udp Use datagram (UDP) only. By
Encode::JP(3pm) - Japanese Encodings - Linux manual page....
To find out how to use this module in detail, see Encode. Note on ISO-2022-JP(-1)? ISO-2022-JP-1 ( RFC2237 ) is a superset of ISO-2022-JP ( RFC1468 ) which adds