illumos: manual page: encrypt.3c

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.

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