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Annotation of 43BSDTahoe/man/man3/crypt.3, revision 1.1.1.1

1.1       root        1: .\"    @(#)crypt.3     6.1 (Berkeley) 5/15/85
                      2: .\"
                      3: .TH CRYPT 3  "May 15, 1985"
                      4: .AT 3
                      5: .SH NAME
                      6: crypt, setkey, encrypt \- DES encryption
                      7: .SH SYNOPSIS
                      8: .nf
                      9: .B char *crypt(key, salt)
                     10: .B char *key, *salt;
                     11: .PP
                     12: .B setkey(key)
                     13: .B char *key;
                     14: .PP
                     15: .B encrypt(block, edflag)
                     16: .B char *block;
                     17: .fi
                     18: .SH DESCRIPTION
                     19: .I Crypt
                     20: is the password encryption routine.
                     21: It is based on the NBS Data Encryption Standard, with
                     22: variations intended (among other things) to frustrate use of hardware
                     23: implementations of the DES for key search.
                     24: .PP
                     25: The first argument to
                     26: .I crypt
                     27: is normally a user's typed password.
                     28: The second is a 2-character string chosen from the
                     29: set [a-zA-Z0-9./].
                     30: The
                     31: .I salt
                     32: string is used to perturb the DES algorithm in one of 4096
                     33: different ways, after which the password
                     34: is used as the key to encrypt repeatedly a constant string.
                     35: The returned value points to the encrypted password,
                     36: in the same alphabet as the salt.
                     37: The first two characters are the salt itself.
                     38: .PP
                     39: The other entries provide (rather primitive)
                     40: access to the actual DES algorithm.
                     41: The argument of
                     42: .I setkey
                     43: is a character array of length 64 containing only the characters
                     44: with numerical value 0 and 1.
                     45: If this string is divided into groups of 8,
                     46: the low-order bit in each group is ignored,
                     47: leading to a 56-bit key which is set into the machine.
                     48: .PP
                     49: The argument to the
                     50: .I encrypt
                     51: entry is likewise a character array of length 64
                     52: containing 0's and 1's.
                     53: The argument array is modified in place
                     54: to a similar array
                     55: representing the bits of the argument after having been
                     56: subjected to the DES algorithm using the key set by
                     57: .I setkey.
                     58: If
                     59: .I edflag
                     60: is 0, the argument is encrypted;
                     61: if non-zero,
                     62: it is decrypted.
                     63: .SH "SEE ALSO"
                     64: passwd(1), passwd(5), login(1), getpass(3)
                     65: .SH BUGS
                     66: The return value
                     67: points to static data whose content is overwritten
                     68: by each call.

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