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CRYPT(3EXT)							   CRYPT(3EXT)

       crypt, setkey, encrypt, des_crypt, des_setkey, des_encrypt, run_setkey,
       run_crypt, crypt_close - password and file encryption functions

       cc [ flag ... ] file ... -lcrypt [ library ... ]
       #include <crypt.h>

       char *crypt(const char *key, const char *salt);

       void setkey(const char *key);

       void encrypt(char *block, int flag);

       char *des_crypt(const char *key, const char *salt);

       void des_setkey(const char *key);

       void des_encrypt(char *block, int flag);

       int run_setkey(int *p, const char *key);

       int run_crypt(long offset, char *buffer, unsigned int count,
	    int *p);

       int crypt_close(int *p);

       des_crypt() is the password encryption function. It is based on a  one-
       way  hashing encryption algorithm with variations intended (among other
       things) to frustrate use of hardware implementations of a key search.

       key is a user's typed password. salt is a two-character	string	chosen
       from  the set [a-zA-Z0-9./]; this string is used to perturb the hashing
       algorithm in one of 4096 different ways, after which  the  password  is
       used  as	 the key to encrypt repeatedly a constant string. The returned
       value points to the encrypted password. The first  two  characters  are
       the salt itself.

       The  des_setkey()  and des_encrypt() entries provide (rather primitive)
       access to the actual hashing algorithm. The argument of des_setkey() is
       a  character  array  of	length	64 containing only the characters with
       numerical value 0 and 1. If this string is divided into	groups	of  8,
       the  low-order  bit in each group is ignored, thereby creating a 56-bit
       key that is set into the machine. This key is the key that will be used
       with  the  hashing algorithm to encrypt the string block with the func‐
       tion des_encrypt().

       The argument to the des_encrypt() entry is a character array of	length
       64  containing  only  the  characters with numerical value 0 and 1. The
       argument array is modified in place to a similar array representing the
       bits  of	 the argument after having been subjected to the hashing algo‐
       rithm using the key set by des_setkey(). If  flag is zero, the argument
       is encrypted; if non-zero, it is decrypted.

       Note  that  decryption  is not provided in the international version of
       crypt(). The international version is part of the  C  Development  Set,
       and  the domestic version is part of the Security Administration Utili‐
       ties.  If decryption is attempted with  the  international  version  of
       des_encrypt(), an error message is printed.

       crypt(),	 setkey(),  and	 encrypt()  are front-end routines that invoke
       des_crypt(), des_setkey(), and des_encrypt() respectively.

       The routines run_setkey() and  run_crypt()  are	designed  for  use  by
       applications  that  need	 cryptographic capabilities, such as ed(1) and
       vi(1). run_setkey() establishes a  two-way  pipe	 connection  with  the
       crypt utility, using key as the password argument.  run_crypt() takes a
       block of characters and transforms the  cleartext  or  ciphertext  into
       their  ciphertext  or cleartext using the crypt utility.	 offset is the
       relative byte position from the beginning of the file that the block of
       text  provided  in block is coming from. count is the number of charac‐
       ters in block, and connection  is an array containing indices to a  ta‐
       ble  of	input  and output file streams.	  When encryption is finished,
       crypt_close() is used to terminate the connection with the crypt	 util‐

       run_setkey()  returns  −1 if a connection with the crypt utility cannot
       be established. This result will occur in international versions of the
       UNIX system in which the crypt utility is not available.	 If a null key
       is passed to run_setkey(), 0 is returned.  Otherwise,  1	 is  returned.
       run_crypt()  returns   −1  if it cannot write output or read input from
       the pipe attached to crypt(). Otherwise it returns  0.

       The program must be linked with the object file access routine  library

       In  the	international  version	of  crypt(),  a flag argument of  1 to
       encrypt() or des_encrypt() is not accepted, and errno is set to	ENOSYS
       to indicate that the functionality is not available.

       See attributes(5) for descriptions of the following attributes:

       │MT-Level       │ Unsafe		 │

       ed(1),	 login(1),    passwd(1),    vi(1),   getpass(3C),   passwd(4),

       The return value in crypt() points to static data that are  overwritten
       by each call.

				  Mar 3, 2008			   CRYPT(3EXT)

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