Split libcrypt and libcipher man pages.
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@ -1,5 +1,5 @@
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#
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# $Id: Makefile,v 1.8 1995/12/16 09:14:07 markm Exp $
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# $Id: Makefile,v 1.10 1996/03/24 07:30:27 markm Exp $
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#
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LCRYPTBASE= libcrypt
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id$
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.\" $Id: crypt.3,v 1.5 1995/12/16 09:01:49 markm Exp $
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.\"
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.\" Manual page, using -mandoc macros
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.\"
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@ -35,23 +35,11 @@
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.Dt CRYPT 3
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.Os "FreeSec 1.0"
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.Sh NAME
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.Nm crypt ,
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.Nm setkey ,
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.Nm encrypt ,
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.Nm des_setkey ,
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.Nm des_cipher ,
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.Nd DES encryption
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.Nm crypt
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.Nd DES trapdoor encryption
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.Sh SYNOPSIS
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.Ft char
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.Fn *crypt "const char *key" "const char *setting"
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.Ft int
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.Fn setkey "char *key"
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.Ft int
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.Fn encrypt "char *block" "int flag"
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.Ft int
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.Fn des_setkey "const char *key"
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.Ft int
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.Fn des_cipher "const char *in" "char *out" "long salt" "int count"
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.Sh DESCRIPTION
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The
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.Fn crypt
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@ -64,9 +52,10 @@ The first argument to
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is a
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.Dv null Ns -terminated
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string, typically a user's typed password.
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The second is in one of two forms:
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The second is in one of three forms:
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if it begins with an underscore (``_'') then an extended format is used
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in interpreting both the the key and the setting, as outlined below.
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if it begins with the string ``$1$'' then an exportable format is used.
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.Ss Extended crypt:
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.Pp
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The
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@ -137,83 +126,9 @@ string, 20 or 13 bytes (plus null) in length, consisting of the
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.Ar setting
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followed by the encoded 64-bit encryption.
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.Pp
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The functions,
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.Fn encrypt ,
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.Fn setkey ,
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.Fn des_setkey
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and
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.Fn des_cipher
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provide access to the
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.Tn DES
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algorithm itself.
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.Fn setkey
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is passed a 64-byte array of binary values (numeric 0 or 1).
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A 56-bit key is extracted from this array by dividing the
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array into groups of 8, and ignoring the last bit in each group.
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That bit is reserved for a byte parity check by DES, but is ignored
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by these functions.
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.Pp
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The
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.Fa block
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argument to
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.Fn encrypt
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is also a 64-byte array of binary values.
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If the value of
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.Fa flag
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is 0,
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.Fa block
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is encrypted otherwise it is decrypted.
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The result is returned in the original array
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.Fa block
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after using the key specified by
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.Fn setkey
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to process it.
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.Pp
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The argument to
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.Fn des_setkey
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is a character array of length 8.
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The least significant bit (the parity bit) in each character is ignored,
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and the remaining bits are concatenated to form a 56-bit key.
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The function
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.Fn des_cipher
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encrypts (or decrypts if
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.Fa count
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is negative) the 64-bits stored in the 8 characters at
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.Fa in
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using
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.Xr abs 3
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of
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.Fa count
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iterations of
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.Tn DES
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and stores the 64-bit result in the 8 characters at
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.Fa out
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(which may be the same as
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.Fa in
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).
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The
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.Fa salt
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specifies perturbations to the
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.Tn DES
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E-box output as described above.
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.Pp
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The function
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.Fn crypt
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returns a pointer to the encrypted value on success, and NULL on failure.
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The functions
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.Fn setkey ,
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.Fn encrypt ,
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.Fn des_setkey ,
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and
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.Fn des_cipher
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return 0 on success and 1 on failure.
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.Pp
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The
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.Fn crypt ,
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.Fn setkey
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and
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.Fn des_setkey
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functions all manipulate the same key space.
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr passwd 1 ,
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