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Annotation of researchv10dc/man/adm/man3/crypt.3, revision 1.1

1.1     ! root        1: .TH CRYPT 3
        !             2: .CT 2 data_man
        !             3: .SH NAME
        !             4: crypt, setkey, encrypt \(mi DES encryption
        !             5: .SH SYNOPSIS
        !             6: .nf
        !             7: .B char *crypt(key, salt)
        !             8: .B char *key, *salt;
        !             9: .PP
        !            10: .B setkey(key)
        !            11: .B char *key;
        !            12: .PP
        !            13: .B encrypt(block, edflag)
        !            14: .B char *block;
        !            15: .fi
        !            16: .SH DESCRIPTION
        !            17: .I Crypt
        !            18: is the password encryption routine.
        !            19: It is based on the NBS Data Encryption Standard, with
        !            20: variations intended (among other things) to frustrate use of hardware
        !            21: implementations of the DES for key search.
        !            22: .PP
        !            23: The first argument to
        !            24: .I crypt
        !            25: is a user's typed password.
        !            26: The second is a 2-character string chosen from the
        !            27: set
        !            28: .BR [a-zA-Z0-9./] .
        !            29: The
        !            30: .I salt
        !            31: string is used to perturb the DES algorithm in one of 4096
        !            32: different ways, after which the password
        !            33: is used as the key to encrypt repeatedly a constant string.
        !            34: The returned value points to the encrypted password,
        !            35: in the same alphabet as the salt.
        !            36: The first two characters are the salt itself.
        !            37: .PP
        !            38: The other functions provide (rather primitive)
        !            39: access to the actual DES algorithm.
        !            40: The argument of
        !            41: .I setkey
        !            42: is a character array of length 64 containing only the characters
        !            43: with numerical value 0 and 1.
        !            44: If this string is divided into groups of 8,
        !            45: the low-order bit in each group is ignored,
        !            46: leading to a 56-bit key which is set into the machine.
        !            47: .PP
        !            48: The argument to 
        !            49: .I encrypt
        !            50: is also a character array of length 64
        !            51: containing 0's and 1's.
        !            52: The 64 argument `bits' are encrypted in place by the DES
        !            53: algorithm using the key previously set by
        !            54: .I setkey.
        !            55: If
        !            56: .I edflag
        !            57: is 0, the argument is encrypted;
        !            58: if non-zero,
        !            59: it is decrypted.
        !            60: .SH "SEE ALSO"
        !            61: .IR crypt (1), 
        !            62: .IR passwd (1), 
        !            63: .IR passwd (5), 
        !            64: .IR getpass (3)
        !            65: .SH BUGS
        !            66: The return value
        !            67: points to static data whose content is overwritten
        !            68: by each call.
        !            69: .br
        !            70: .I Encrypt
        !            71: is not available outside the United States and Canada.

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