BSD 2.11 - man page for setkey (bsd section 3)
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crypt, setkey, encrypt - DES encryption
char *crypt(key, salt)
char *key, *salt;
Crypt is the password encryption routine. It is based on the NBS Data Encryption Stan-
dard, with variations intended (among other things) to frustrate use of hardware implemen-
tations of the DES for key search.
The first argument to crypt is normally a user's typed password. The second is a 2-char-
acter string chosen from the set [a-zA-Z0-9./]. The salt string is used to perturb the
DES 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 pass-
word, in the same alphabet as the salt. The first two characters are the salt itself.
The other entries provide (rather primitive) access to the actual DES algorithm. The
argument of 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, leading to a 56-bit key which is set into the machine.
The argument to the encrypt entry is likewise a character array of length 64 containing
0's and 1's. The argument array is modified in place to a similar array representing the
bits of the argument after having been subjected to the DES algorithm using the key set by
setkey. The edflag flag is ignored; the argument can only be encrypted.
passwd(1), passwd(5), login(1), getpass(3)
The return value points to static data whose content is overwritten by each call.
7th Edition August 12, 1986 CRYPT(3)
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