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-.\" from: des_crypt.3,v 4.3 89/01/23 17:08:59 steiner Exp $
-.\" $Id: des_crypt.3,v 1.1.1.1 1994/09/30 14:50:05 csgr Exp $
-.\" Copyright 1989 by the Massachusetts Institute of Technology.
-.\"
-.\" For copying and distribution information,
-.\" please see the file <Copyright.MIT>.
-.\"
-.TH DES_CRYPT 3  "Kerberos Version 4.0" "MIT Project Athena"
-.SH NAME
-des_read_password, des_string_to_key, des_random_key, des_set_key,
-des_ecb_encrypt, des_cbc_encrypt, des_pcbc_encrypt, des_cbc_cksum,
-des_quad_cksum, \- (new) DES encryption
-.SH SYNOPSIS
-.nf
-.nj
-.ft B
-#include <kerberosIV/des.h>
-.PP
-.ft B
-.B int des_read_password(key,prompt,verify)
-des_cblock *key;
-char *prompt;
-int verify;
-.PP
-.ft B
-int des_string_to_key(str,key)
-char *str;
-des_cblock key;
-.PP
-.ft B
-int des_random_key(key)
-des_cblock *key;
-.PP
-.ft B
-int des_set_key(key,schedule)
-des_cblock *key;
-des_key_schedule schedule;
-.PP
-.ft B
-int des_ecb_encrypt(input,output,schedule,encrypt)
-des_cblock *input;
-des_cblock *output;
-des_key_schedule schedule;
-int encrypt;
-.PP
-.ft 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
-.ft 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
-.ft 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
-.ft B
-unsigned long quad_cksum(input,output,length,out_count,seed)
-des_cblock *input;
-des_cblock *output;
-long length;
-int out_count;
-des_cblock *seed;
-.PP
-.fi
-.SH DESCRIPTION
-This library supports various DES encryption related operations. It differs
-from the
-.I crypt, setkey, and encrypt
-library routines in that it provides
-a true DES encryption, without modifying the algorithm,
-and executes much faster.
-.PP
-For each key that may be simultaneously active, create a
-.B des_key_schedule
-struct,
-defined in "des.h". Next, create key schedules (from the 8-byte keys) as
-needed, via
-.I des_set_key,
-prior to using the encryption or checksum routines. Then
-setup the input and output areas.  Make sure to note the restrictions
-on lengths being multiples of eight bytes. Finally, invoke the
-encryption/decryption routines,
-.I des_ecb_encrypt
-or
-.I des_cbc_encrypt
-or
-.I des_pcbc_encrypt,
-or, to generate a cryptographic checksum, use
-.I quad_cksum
-(fast) or
-.I des_cbc_cksum
-(slow).
-.PP
-A
-.I des_cblock
-struct is an 8 byte block used as the fundamental unit for DES data and
-keys, and is defined as:
-.PP
-.B	typedef	unsigned char des_cblock[8];
-.PP
-and a
-.I des_key_schedule,
-is defined as:
-.PP
-.B	typedef	struct des_ks_struct {des_cblock _;}  des_key_schedule[16];
-.PP
-.I des_read_password
-writes the string specified by
-.I prompt
-to the standard
-output, turns off echo (if possible)
-and reads an input string from standard input until terminated with a newline.
-If
-.I verify
-is non-zero, it prompts and reads input again, for use
-in applications such as changing a password; both
-versions are compared, and the input is requested repeatedly until they
-match.  Then
-.I des_read_password
-converts the input string into a valid DES key, internally
-using the
-.I des_string_to_key
-routine.  The newly created key is copied to the
-area pointed to by the
-.I key
-argument.
-.I des_read_password
-returns a zero if no errors occurred, or a -1
-indicating that an error
-occurred trying to manipulate the terminal echo.
-.PP
-.PP
-.I des_string_to_key
-converts an arbitrary length null-terminated string
-to an 8 byte DES key, with odd byte parity, per FIPS specification.
-A one-way function is used to convert the string to a key, making it
-very difficult to reconstruct the string from the key.
-The
-.I str
-argument is a pointer to the string, and
-.I key
-should
-point to a
-.I des_cblock
-supplied by the caller to receive the generated key.
-No meaningful value is returned. Void is not used for compatibility with
-other compilers.
-.PP
-.PP
-.I des_random_key
-generates a random DES encryption key (eight bytes), set to odd parity per
-FIPS
-specifications.
-This routine uses the current time, process id, and a counter
-as a seed for the random number generator.
-The caller must	supply space for the output key, pointed to
-by argument
-.I key,
-then after calling
-.I des_random_key
-should
-call the
-.I des_set_key
-routine when needed.
-No meaningful value is returned.  Void is not used for compatibility
-with other compilers.
-.PP
-.PP
-.I des_set_key
-calculates a key schedule from all eight bytes of the input key, pointed
-to by the
-.I key
-argument, and outputs the schedule into the
-.I des_key_schedule
-indicated by the
-.I schedule
-argument. Make sure to pass a valid eight byte
-key; no padding is done.  The key schedule may then be used in subsequent
-encryption/decryption/checksum operations.  Many key schedules may be
-cached for later use.  The user is responsible to clear keys and schedules
-as soon as no longer needed, to prevent their disclosure.
-The routine also checks the key
-parity, and returns a zero if the key parity is correct (odd), a -1
-indicating a key parity error, or a -2 indicating use of an illegal
-weak key. If an error is returned, the key schedule was not created.
-.PP
-.PP
-.I des_ecb_encrypt
-is the basic DES encryption routine that encrypts or decrypts a single 8-byte
-block in
-.B 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.
-.PP
-If the
-.I encrypt
-argument is non-zero, the
-.I input
-(cleartext) is encrypted into the
-.I output
-(ciphertext) using the key_schedule specified by the
-.I schedule
-argument, previously set via
-.I des_set_key
-.PP
-If encrypt is zero, the
-.I input
-(now ciphertext) is decrypted into the
-.I output
-(now cleartext).
-.PP
-Input and output may overlap.
-.PP
-No meaningful value is returned.  Void is not used for compatibility
-with other compilers.
-.PP
-.PP
-.I des_cbc_encrypt
-encrypts/decrypts using the
-.B 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 initialization 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 temp and zero
-filled (highest addresses).  The output is ALWAYS an integral multiple
-of eight bytes.
-.PP
-If
-.I encrypt
-is zero, the routine cipher-block chain decrypts the (now) ciphertext
-data pointed to by the
-.I input
-argument into (now) cleartext pointed to by the
-.I output
-argument using the key schedule provided by the
-.I schedule
-argument, and initialization vector provided by the
-.I ivec
-argument. Decryption ALWAYS operates on integral
-multiples of 8 bytes, so it will round the
-.I length
-provided up to the
-appropriate multiple. Consequently, it will always produce the rounded-up
-number of bytes of output cleartext. The application must determine if
-the output cleartext was zero-padded due to original cleartext lengths that
-were not integral multiples of 8.
-.PP
-No errors or meaningful values are returned.  Void is not used for
-compatibility with other compilers.
-.PP
-A characteristic of cbc mode is that changing a single bit of the
-cleartext, then encrypting using cbc mode,
-affects ALL the subsequent ciphertext.  This makes cryptanalysis
-much more difficult. However, modifying a single bit of the ciphertext,
-then decrypting, only affects the resulting cleartext from
-the modified block and the succeeding block.  Therefore,
-.I des_pcbc_encrypt
-is STRONGLY recommended for applications where
-indefinite propagation of errors is required in order to detect modifications.
-.PP
-.PP
-.I des_pcbc_encrypt
-encrypts/decrypts using a modified block chaining mode. Its calling
-sequence is identical to
-.I des_cbc_encrypt.
-It differs in its error propagation characteristics.
-.PP
-.I des_pcbc_encrypt
-is highly recommended for most encryption purposes, in that
-modification of a single bit of the ciphertext will affect ALL the
-subsequent (decrypted) cleartext. Similarly, modifying a single bit of
-the cleartext will affect ALL the subsequent (encrypted) ciphertext.
-"PCBC" mode, on encryption, "xors" both the
-cleartext of block N and the ciphertext resulting from block N with the
-cleartext for block N+1 prior to encrypting block N+1.
-.PP
-.I des_cbc_cksum
-produces an 8 byte cryptographic checksum by cipher-block-chain
-encrypting the cleartext data pointed to by the
-.I input
-argument. All of the ciphertext output is discarded, except the
-last 8-byte ciphertext block, which is written into the area pointed to by
-the
-.I output
-argument.
-It uses the key schedule,
-provided by the
-.I schedule
-argument and initialization vector provided by the
-.I ivec
-argument.
-If the
-.I length
-argument is not an integral
-multiple of eight bytes, the last cleartext block is copied to a temp and zero
-filled (highest addresses).  The output is ALWAYS eight bytes.
-.PP
-The routine also returns an unsigned long, which is the last (highest address)
-half of the 8 byte checksum computed.
-.PP
-.PP
-.I quad_cksum
-produces a checksum by chaining quadratic operations on the cleartext data
-pointed to by the
-.I input
-argument. The
-.I length
-argument specifies the length of the
-input -- only exactly that many bytes are included for the checksum,
-without any padding.
-.PP
-The algorithm may be iterated over the same input data, if the
-.I out_count
-argument is 2, 3 or 4, and the optional
-.I output
-argument is a non-null pointer .
-The default is one iteration, and it will not run
-more than 4 times. Multiple iterations run slower, but provide
-a longer checksum if desired. The
-.I seed
-argument provides an 8-byte seed for the first iteration. If multiple iterations are
-requested, the results of one iteration are automatically used as
-the seed for the next iteration.
-.PP
-It returns both an unsigned long checksum value, and
-if the
-.I output
-argument is not a null pointer, up to 16 bytes of
-the computed checksum are written into the output.
-.PP
-.PP
-.SH FILES
-/usr/include/kerberosIV/des.h
-.br
-/usr/lib/libdes.a
-.SH "SEE ALSO"
-.SH DIAGNOSTICS
-.SH BUGS
-This software has not yet been compiled or tested on machines other than the
-VAX and the IBM PC.
-.SH AUTHORS
-Steve Miller, MIT Project Athena/Digital Equipment Corporation
-.SH RESTRICTIONS
-COPYRIGHT 1985,1986 Massachusetts Institute of Technology
-.PP
-This software may not be exported outside of the US without a special
-license from the US Dept of Commerce. It may be replaced by any secret
-key block cipher with block length and key length of 8 bytes, as long
-as the interface is the same as described here.