This man page has not been referenced by anything for a while,
and is not part of the OpenSSL distribution. Remove it.
This commit is contained in:
parent
2488110620
commit
b55e3089db
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=100934
@ -1,509 +0,0 @@
|
||||
.\" $FreeBSD$
|
||||
.TH DES_CRYPT 3
|
||||
.SH NAME
|
||||
des_read_password, des_read_2password,
|
||||
des_string_to_key, des_string_to_2key, des_read_pw_string,
|
||||
des_random_key, des_set_key,
|
||||
des_key_sched, des_ecb_encrypt, des_ecb3_encrypt, des_cbc_encrypt,
|
||||
des_3cbc_encrypt,
|
||||
des_pcbc_encrypt, des_cfb_encrypt, des_ofb_encrypt,
|
||||
des_cbc_cksum, des_quad_cksum,
|
||||
des_enc_read, des_enc_write, des_set_odd_parity,
|
||||
des_is_weak_key, crypt \- (non USA) DES encryption
|
||||
.SH SYNOPSIS
|
||||
.nf
|
||||
.nj
|
||||
.ft B
|
||||
#include <openssl/des.h>
|
||||
.PP
|
||||
.B int des_read_password(key,prompt,verify)
|
||||
des_cblock *key;
|
||||
char *prompt;
|
||||
int verify;
|
||||
.PP
|
||||
.B int des_read_2password(key1,key2,prompt,verify)
|
||||
des_cblock *key1,*key2;
|
||||
char *prompt;
|
||||
int verify;
|
||||
.PP
|
||||
.B int des_string_to_key(str,key)
|
||||
char *str;
|
||||
des_cblock *key;
|
||||
.PP
|
||||
.B int des_string_to_2keys(str,key1,key2)
|
||||
char *str;
|
||||
des_cblock *key1,*key2;
|
||||
.PP
|
||||
.B int des_read_pw_string(buf,length,prompt,verify)
|
||||
char *buf;
|
||||
int length;
|
||||
char *prompt;
|
||||
int verify;
|
||||
.PP
|
||||
.B int des_random_key(key)
|
||||
des_cblock *key;
|
||||
.PP
|
||||
.B int des_set_key(key,schedule)
|
||||
des_cblock *key;
|
||||
des_key_schedule schedule;
|
||||
.PP
|
||||
.B int des_key_sched(key,schedule)
|
||||
des_cblock *key;
|
||||
des_key_schedule schedule;
|
||||
.PP
|
||||
.B int des_ecb_encrypt(input,output,schedule,encrypt)
|
||||
des_cblock *input;
|
||||
des_cblock *output;
|
||||
des_key_schedule schedule;
|
||||
int encrypt;
|
||||
.PP
|
||||
.B int des_ecb3_encrypt(input,output,ks1,ks2,encrypt)
|
||||
des_cblock *input;
|
||||
des_cblock *output;
|
||||
des_key_schedule ks1,ks2;
|
||||
int encrypt;
|
||||
.PP
|
||||
.B int des_cbc_encrypt(input,output,length,schedule,ivec,encrypt)
|
||||
des_cblock *input;
|
||||
des_cblock *output;
|
||||
long length;
|
||||
des_key_schedule schedule;
|
||||
des_cblock *ivec;
|
||||
int encrypt;
|
||||
.PP
|
||||
.B int des_3cbc_encrypt(input,output,length,sk1,sk2,ivec1,ivec2,encrypt)
|
||||
des_cblock *input;
|
||||
des_cblock *output;
|
||||
long length;
|
||||
des_key_schedule sk1;
|
||||
des_key_schedule sk2;
|
||||
des_cblock *ivec1;
|
||||
des_cblock *ivec2;
|
||||
int encrypt;
|
||||
.PP
|
||||
.B int des_pcbc_encrypt(input,output,length,schedule,ivec,encrypt)
|
||||
des_cblock *input;
|
||||
des_cblock *output;
|
||||
long length;
|
||||
des_key_schedule schedule;
|
||||
des_cblock *ivec;
|
||||
int encrypt;
|
||||
.PP
|
||||
.B int des_cfb_encrypt(input,output,numbits,length,schedule,ivec,encrypt)
|
||||
unsigned char *input;
|
||||
unsigned char *output;
|
||||
int numbits;
|
||||
long length;
|
||||
des_key_schedule schedule;
|
||||
des_cblock *ivec;
|
||||
int encrypt;
|
||||
.PP
|
||||
.B int des_ofb_encrypt(input,output,numbits,length,schedule,ivec)
|
||||
unsigned char *input,*output;
|
||||
int numbits;
|
||||
long length;
|
||||
des_key_schedule schedule;
|
||||
des_cblock *ivec;
|
||||
.PP
|
||||
.B unsigned long des_cbc_cksum(input,output,length,schedule,ivec)
|
||||
des_cblock *input;
|
||||
des_cblock *output;
|
||||
long length;
|
||||
des_key_schedule schedule;
|
||||
des_cblock *ivec;
|
||||
.PP
|
||||
.B unsigned long des_quad_cksum(input,output,length,out_count,seed)
|
||||
des_cblock *input;
|
||||
des_cblock *output;
|
||||
long length;
|
||||
int out_count;
|
||||
des_cblock *seed;
|
||||
.PP
|
||||
.B int des_check_key;
|
||||
.PP
|
||||
.B int des_enc_read(fd,buf,len,sched,iv)
|
||||
int fd;
|
||||
char *buf;
|
||||
int len;
|
||||
des_key_schedule sched;
|
||||
des_cblock *iv;
|
||||
.PP
|
||||
.B int des_enc_write(fd,buf,len,sched,iv)
|
||||
int fd;
|
||||
char *buf;
|
||||
int len;
|
||||
des_key_schedule sched;
|
||||
des_cblock *iv;
|
||||
.PP
|
||||
.B extern int des_rw_mode;
|
||||
.PP
|
||||
.B void des_set_odd_parity(key)
|
||||
des_cblock *key;
|
||||
.PP
|
||||
.B int des_is_weak_key(key)
|
||||
des_cblock *key;
|
||||
.PP
|
||||
.B char *crypt(passwd,salt)
|
||||
char *passwd;
|
||||
char *salt;
|
||||
.PP
|
||||
.fi
|
||||
.SH DESCRIPTION
|
||||
This library contains a fast implementation of the DES encryption
|
||||
algorithm.
|
||||
.PP
|
||||
There are two phases to the use of DES encryption.
|
||||
The first is the generation of a
|
||||
.I des_key_schedule
|
||||
from a key,
|
||||
the second is the actual encryption.
|
||||
A des key is of type
|
||||
.I des_cblock.
|
||||
This type is made from 8 characters with odd parity.
|
||||
The least significant bit in the character is the parity bit.
|
||||
The key schedule is an expanded form of the key; it is used to speed the
|
||||
encryption process.
|
||||
.PP
|
||||
.I des_read_password
|
||||
writes the string specified by prompt to the standard output,
|
||||
turns off echo and reads an input string from standard input
|
||||
until terminated with a newline.
|
||||
If verify is non-zero, it prompts and reads the input again and verifies
|
||||
that both entered passwords are the same.
|
||||
The entered string is converted into a des key by using the
|
||||
.I des_string_to_key
|
||||
routine.
|
||||
The new key is placed in the
|
||||
.I des_cblock
|
||||
that was passed (by reference) to the routine.
|
||||
If there were no errors,
|
||||
.I des_read_password
|
||||
returns 0,
|
||||
-1 is returned if there was a terminal error and 1 is returned for
|
||||
any other error.
|
||||
.PP
|
||||
.I des_read_2password
|
||||
operates in the same way as
|
||||
.I des_read_password
|
||||
except that it generates 2 keys by using the
|
||||
.I des_string_to_2key
|
||||
function.
|
||||
.PP
|
||||
.I des_read_pw_string
|
||||
is called by
|
||||
.I des_read_password
|
||||
to read and verify a string from a terminal device.
|
||||
The string is returned in
|
||||
.I buf.
|
||||
The size of
|
||||
.I buf
|
||||
is passed to the routine via the
|
||||
.I length
|
||||
parameter.
|
||||
.PP
|
||||
.I des_string_to_key
|
||||
converts a string into a valid des key.
|
||||
.PP
|
||||
.I des_string_to_2key
|
||||
converts a string into 2 valid des keys.
|
||||
This routine is best suited for used to generate keys for use with
|
||||
.I des_ecb3_encrypt.
|
||||
.PP
|
||||
.I des_random_key
|
||||
returns a random key that is made of a combination of process id,
|
||||
time and an increasing counter.
|
||||
.PP
|
||||
Before a des key can be used it is converted into a
|
||||
.I des_key_schedule
|
||||
via the
|
||||
.I des_set_key
|
||||
routine.
|
||||
If the
|
||||
.I des_check_key
|
||||
flag is non-zero,
|
||||
.I des_set_key
|
||||
will check that the key passed is of odd parity and is not a week or
|
||||
semi-weak key.
|
||||
If the parity is wrong,
|
||||
then -1 is returned.
|
||||
If the key is a weak key,
|
||||
then -2 is returned.
|
||||
If an error is returned,
|
||||
the key schedule is not generated.
|
||||
.PP
|
||||
.I des_key_sched
|
||||
is another name for the
|
||||
.I des_set_key
|
||||
function.
|
||||
.PP
|
||||
The following routines mostly operate on an input and output stream of
|
||||
.I des_cblock's.
|
||||
.PP
|
||||
.I des_ecb_encrypt
|
||||
is the basic DES encryption routine that encrypts or decrypts a single 8-byte
|
||||
.I des_cblock
|
||||
in
|
||||
.I electronic code book
|
||||
mode.
|
||||
It always transforms the input data, pointed to by
|
||||
.I input,
|
||||
into the output data,
|
||||
pointed to by the
|
||||
.I output
|
||||
argument.
|
||||
If the
|
||||
.I encrypt
|
||||
argument is non-zero (DES_ENCRYPT),
|
||||
the
|
||||
.I input
|
||||
(cleartext) is encrypted in to the
|
||||
.I output
|
||||
(ciphertext) using the key_schedule specified by the
|
||||
.I schedule
|
||||
argument,
|
||||
previously set via
|
||||
.I des_set_key.
|
||||
If
|
||||
.I encrypt
|
||||
is zero (DES_DECRYPT),
|
||||
the
|
||||
.I input
|
||||
(now ciphertext)
|
||||
is decrypted into the
|
||||
.I output
|
||||
(now cleartext).
|
||||
Input and output may overlap.
|
||||
No meaningful value is returned.
|
||||
.PP
|
||||
.I des_ecb3_encrypt
|
||||
encrypts/decrypts the
|
||||
.I input
|
||||
block by using triple ecb DES encryption.
|
||||
This involves encrypting the input with
|
||||
.I ks1,
|
||||
decryption with the key schedule
|
||||
.I ks2,
|
||||
and then encryption with the first again.
|
||||
This routine greatly reduces the chances of brute force breaking of
|
||||
DES and has the advantage of if
|
||||
.I ks1
|
||||
and
|
||||
.I ks2
|
||||
are the same, it is equivalent to just encryption using ecb mode and
|
||||
.I ks1
|
||||
as the key.
|
||||
.PP
|
||||
.I des_cbc_encrypt
|
||||
encrypts/decrypts using the
|
||||
.I cipher-block-chaining
|
||||
mode of DES.
|
||||
If the
|
||||
.I encrypt
|
||||
argument is non-zero,
|
||||
the routine cipher-block-chain encrypts the cleartext data pointed to by the
|
||||
.I input
|
||||
argument into the ciphertext pointed to by the
|
||||
.I output
|
||||
argument,
|
||||
using the key schedule provided by the
|
||||
.I schedule
|
||||
argument,
|
||||
and initialisation vector provided by the
|
||||
.I ivec
|
||||
argument.
|
||||
If the
|
||||
.I length
|
||||
argument is not an integral multiple of eight bytes,
|
||||
the last block is copied to a temporary area and zero filled.
|
||||
The output is always
|
||||
an integral multiple of eight bytes.
|
||||
To make multiple cbc encrypt calls on a large amount of data appear to
|
||||
be one
|
||||
.I des_cbc_encrypt
|
||||
call, the
|
||||
.I ivec
|
||||
of subsequent calls should be the last 8 bytes of the output.
|
||||
.PP
|
||||
.I des_3cbc_encrypt
|
||||
encrypts/decrypts the
|
||||
.I input
|
||||
block by using triple cbc DES encryption.
|
||||
This involves encrypting the input with key schedule
|
||||
.I ks1,
|
||||
decryption with the key schedule
|
||||
.I ks2,
|
||||
and then encryption with the first again.
|
||||
2 initialisation vectors are required,
|
||||
.I ivec1
|
||||
and
|
||||
.I ivec2.
|
||||
Unlike
|
||||
.I des_cbc_encrypt,
|
||||
these initialisation vectors are modified by the subroutine.
|
||||
This routine greatly reduces the chances of brute force breaking of
|
||||
DES and has the advantage of if
|
||||
.I ks1
|
||||
and
|
||||
.I ks2
|
||||
are the same, it is equivalent to just encryption using cbc mode and
|
||||
.I ks1
|
||||
as the key.
|
||||
.PP
|
||||
.I des_pcbc_encrypt
|
||||
encrypt/decrypts using a modified block chaining mode.
|
||||
It provides better error propagation characteristics than cbc
|
||||
encryption.
|
||||
.PP
|
||||
.I des_cfb_encrypt
|
||||
encrypt/decrypts using cipher feedback mode. This method takes an
|
||||
array of characters as input and outputs and array of characters. It
|
||||
does not require any padding to 8 character groups. Note: the ivec
|
||||
variable is changed and the new changed value needs to be passed to
|
||||
the next call to this function. Since this function runs a complete
|
||||
DES ecb encryption per numbits, this function is only suggested for
|
||||
use when sending small numbers of characters.
|
||||
.PP
|
||||
.I des_ofb_encrypt
|
||||
encrypt using output feedback mode. This method takes an
|
||||
array of characters as input and outputs and array of characters. It
|
||||
does not require any padding to 8 character groups. Note: the ivec
|
||||
variable is changed and the new changed value needs to be passed to
|
||||
the next call to this function. Since this function runs a complete
|
||||
DES ecb encryption per numbits, this function is only suggested for
|
||||
use when sending small numbers of characters.
|
||||
.PP
|
||||
.I des_cbc_cksum
|
||||
produces an 8 byte checksum based on the input stream (via cbc encryption).
|
||||
The last 4 bytes of the checksum is returned and the complete 8 bytes is
|
||||
placed in
|
||||
.I output.
|
||||
.PP
|
||||
.I des_quad_cksum
|
||||
returns a 4 byte checksum from the input bytes.
|
||||
The algorithm can be iterated over the input,
|
||||
depending on
|
||||
.I out_count,
|
||||
1, 2, 3 or 4 times.
|
||||
If
|
||||
.I output
|
||||
is non-NULL,
|
||||
the 8 bytes generated by each pass are written into
|
||||
.I output.
|
||||
.PP
|
||||
.I des_enc_write
|
||||
is used to write
|
||||
.I len
|
||||
bytes
|
||||
to file descriptor
|
||||
.I fd
|
||||
from buffer
|
||||
.I buf.
|
||||
The data is encrypted via
|
||||
.I pcbc_encrypt
|
||||
(default) using
|
||||
.I sched
|
||||
for the key and
|
||||
.I iv
|
||||
as a starting vector.
|
||||
The actual data send down
|
||||
.I fd
|
||||
consists of 4 bytes (in network byte order) containing the length of the
|
||||
following encrypted data. The encrypted data then follows, padded with random
|
||||
data out to a multiple of 8 bytes.
|
||||
.PP
|
||||
.I des_enc_read
|
||||
is used to read
|
||||
.I len
|
||||
bytes
|
||||
from file descriptor
|
||||
.I fd
|
||||
into buffer
|
||||
.I buf.
|
||||
The data being read from
|
||||
.I fd
|
||||
is assumed to have come from
|
||||
.I des_enc_write
|
||||
and is decrypted using
|
||||
.I sched
|
||||
for the key schedule and
|
||||
.I iv
|
||||
for the initial vector.
|
||||
The
|
||||
.I des_enc_read/des_enc_write
|
||||
pair can be used to read/write to files, pipes and sockets.
|
||||
I have used them in implementing a version of rlogin in which all
|
||||
data is encrypted.
|
||||
.PP
|
||||
.I des_rw_mode
|
||||
is used to specify the encryption mode to use with
|
||||
.I des_enc_read
|
||||
and
|
||||
.I des_end_write.
|
||||
If set to
|
||||
.I DES_PCBC_MODE
|
||||
(the default), des_pcbc_encrypt is used.
|
||||
If set to
|
||||
.I DES_CBC_MODE
|
||||
des_cbc_encrypt is used.
|
||||
These two routines and the variable are not part of the normal MIT library.
|
||||
.PP
|
||||
.I des_set_odd_parity
|
||||
sets the parity of the passed
|
||||
.I key
|
||||
to odd. This routine is not part of the standard MIT library.
|
||||
.PP
|
||||
.I des_is_weak_key
|
||||
returns 1 is the passed key is a weak key (pick again :-),
|
||||
0 if it is ok.
|
||||
This routine is not part of the standard MIT library.
|
||||
.PP
|
||||
.I crypt
|
||||
is a replacement for the normal system crypt.
|
||||
It is much faster than the system crypt.
|
||||
.PP
|
||||
.SH FILES
|
||||
/usr/include/openssl/des.h
|
||||
.br
|
||||
/usr/lib/libcrypto.a
|
||||
.PP
|
||||
The encryption routines have been tested on 16bit, 32bit and 64bit
|
||||
machines of various endian and even works under VMS.
|
||||
.PP
|
||||
.SH BUGS
|
||||
.PP
|
||||
If you think this manual is sparse,
|
||||
read the des_crypt(3) manual from the MIT kerberos (or bones outside
|
||||
of the USA) distribution.
|
||||
.PP
|
||||
.I des_cfb_encrypt
|
||||
and
|
||||
.I des_ofb_encrypt
|
||||
operates on input of 8 bits. What this means is that if you set
|
||||
numbits to 12, and length to 2, the first 12 bits will come from the 1st
|
||||
input byte and the low half of the second input byte. The second 12
|
||||
bits will have the low 8 bits taken from the 3rd input byte and the
|
||||
top 4 bits taken from the 4th input byte. The same holds for output.
|
||||
This function has been implemented this way because most people will
|
||||
be using a multiple of 8 and because once you get into pulling bytes input
|
||||
bytes apart things get ugly!
|
||||
.PP
|
||||
.I des_read_pw_string
|
||||
is the most machine/OS dependent function and normally generates the
|
||||
most problems when porting this code.
|
||||
.PP
|
||||
.I des_string_to_key
|
||||
is probably different from the MIT version since there are lots
|
||||
of fun ways to implement one-way encryption of a text string.
|
||||
.PP
|
||||
The routines are optimised for 32 bit machines and so are not efficient
|
||||
on IBM PCs.
|
||||
.PP
|
||||
NOTE: extensive work has been done on this library since this document
|
||||
was origionally written. Please try to read des.doc from the libdes
|
||||
distribution since it is far more upto date and documents more of the
|
||||
functions. Libdes is now also being shipped as part of SSLeay, a
|
||||
general cryptographic library that amonst other things implements
|
||||
netscapes SSL protocoll. The most recent version can be found in
|
||||
SSLeay distributions.
|
||||
.SH AUTHOR
|
||||
Eric Young (eay@cryptsoft.com)
|
Loading…
Reference in New Issue
Block a user