ENCRYPT(3C) Standard C Library Functions ENCRYPT(3C)
NAME
encrypt - 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
hashing 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
containing only the bytes with numerical value of 0 and 1. The array
is modified 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. Historical 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(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | Safe |
+--------------------+-----------------+
SEE ALSO
crypt(3C),
setkey(3C),
attributes(7) May 2, 2001 ENCRYPT(3C)
