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/*
* Copyright (c) 1990 Dennis Ferguson. All rights reserved.
*
* Commercial use is permitted only if products which are derived from
* or include this software are made available for purchase and/or use
* in Canada. Otherwise, redistribution and use in source and binary
* forms are permitted.
*/
/*
* des_ecb_encrypt.c - do an encryption in ECB mode
*/
#include "des.h"
#include "des_int.h"
#include "f_tables.h"
/*
* des_ecb_encrypt - {en,de}crypt a block in ECB mode
*/
int
mit_des_ecb_encrypt(in, out, schedule, encrypt)
const mit_des_cblock *in;
mit_des_cblock *out;
mit_des_key_schedule schedule;
int encrypt;
{
register unsigned KRB_INT32 left, right;
register unsigned KRB_INT32 temp;
register int i;
{
/*
* Need a temporary for copying the data in
*/
register unsigned char *datap;
/*
* Copy the input block into the registers
*/
datap = (unsigned char *)in;
GET_HALF_BLOCK(left, datap);
GET_HALF_BLOCK(right, datap);
}
/*
* Do the initial permutation.
*/
DES_INITIAL_PERM(left, right, temp);
/*
* Now the rounds. Use different code depending on whether it
* is an encryption or a decryption (gross, should keep both
* sets of keys in the key schedule instead).
*/
if (encrypt) {
register unsigned KRB_INT32 *kp;
kp = (unsigned KRB_INT32 *)schedule;
for (i = 0; i < 8; i++) {
DES_SP_ENCRYPT_ROUND(left, right, temp, kp);
DES_SP_ENCRYPT_ROUND(right, left, temp, kp);
}
} else {
register unsigned KRB_INT32 *kp;
/*
* Point kp past end of schedule
*/
kp = ((unsigned KRB_INT32 *)schedule) + (2 * 16);;
for (i = 0; i < 8; i++) {
DES_SP_DECRYPT_ROUND(left, right, temp, kp);
DES_SP_DECRYPT_ROUND(right, left, temp, kp);
}
}
/*
* Do the final permutation
*/
DES_FINAL_PERM(left, right, temp);
/*
* Finally, copy the result out a byte at a time
*/
{
register unsigned char *datap;
datap = (unsigned char *)out;
PUT_HALF_BLOCK(left, datap);
PUT_HALF_BLOCK(right, datap);
}
/*
* return nothing
*/
return (0);
}
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