ENCRYPT(3C)ENCRYPT(3C)NAMEencrypt - encoding function
SYNOPSIS
#include <crypt.h>
void encrypt(char block[64], int edflag);
Standard conforming
#include <unistd.h>
void encrypt(char block[64], int edflag);
DESCRIPTION
The encrypt() function provides (rather primitive) access to the hash‐
ing algorithm employed by the crypt(3C) function. The key generated by
setkey(3C) is used to encrypt the string block with encrypt().
The block argument to encrypt() is an array of length 64 bytes contain‐
ing only the bytes with numerical value of 0 and 1. The array is modi‐
fied in place to a similar array using the key set by setkey(3C). If
edflag is 0, the argument is encoded. If edflag is 1, the argument may
be decoded (see the USAGE section below); if the argument is not
decoded, errno will be set to ENOSYS.
RETURN VALUES
The encrypt() function returns no value.
ERRORS
The encrypt() function will fail if:
ENOSYS
The functionality is not supported on this implementation.
USAGE
In some environments, decoding may not be implemented. This is related
to U.S. Government restrictions on encryption and decryption routines:
the DES decryption algorithm cannot be exported outside the U.S.A. His‐
torical 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 encrypt() does encoding but not decoding.
Because encrypt() does not return a value, applications wishing to
check for errors should set errno to 0, call encrypt(), then test errno
and, if it is non-zero, assume an error has occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────┤
│MT-Level │ Safe │
└────────────────────┴─────────────────┘
SEE ALSOcrypt(3C), setkey(3C), attributes(5)
May 2, 2001 ENCRYPT(3C)
