+++ /dev/null
-/* -*-c-*-
- *
- * $Id: icrypt.c,v 1.4 1998/01/12 16:46:02 mdw Exp $
- *
- * Higher level encryption functions
- *
- * (c) 1998 Mark Wooding
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of `become'
- *
- * `Become' is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * `Become' is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with `become'; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: icrypt.c,v $
- * Revision 1.4 1998/01/12 16:46:02 mdw
- * Fix copyright date.
- *
- * Revision 1.3 1997/09/26 09:14:58 mdw
- * Merged blowfish branch into trunk.
- *
- * Revision 1.2.2.1 1997/09/26 09:08:07 mdw
- * Use the Blowfish encryption algorithm instead of IDEA. This is partly
- * because I prefer Blowfish (without any particularly strong evidence) but
- * mainly because IDEA is patented and Blowfish isn't.
- *
- * Revision 1.2 1997/08/04 10:24:22 mdw
- * Sources placed under CVS control.
- *
- * Revision 1.1 1997/07/21 13:47:49 mdw
- * Initial revision
- *
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-/* --- ANSI headers --- */
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-
-/* --- Local headers --- */
-
-#include "blowfish.h"
-#include "config.h"
-#include "icrypt.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @icrypt_init@ --- *
- *
- * Arguments: @icrypt_job *j@ = pointer to job context block
- * @unsigned char *k@ = pointer to key data
- * @size_t sz@ = size of the key data
- * @const unsigned char *iv@ = pointer to IV
- *
- * Returns: ---
- *
- * Use: Primes the context block ready for encryption.
- */
-
-void icrypt_init(icrypt_job *j, unsigned char *k,
- size_t sz, const unsigned char *iv)
-{
- blowfish_setKey(&j->k, k, sz);
- if (iv)
- memcpy(j->iv, iv, BLOWFISH_BLKSIZE);
- else
- memset(j->iv, 0, BLOWFISH_BLKSIZE);
- j->i = 8;
-}
-
-/* --- @icrypt_encrypt@ --- *
- *
- * Arguments: @icrypt_job *j@ = job handle
- * @const void *src@ = pointer to source buffer
- * @void *dest@ = pointer to destination buffer
- * @size_t sz@ = size of buffers to handle
- *
- * Returns: ---
- *
- * Use: Encrypts data from the source to the destination, using the
- * key attached to the job handle.
- */
-
-void icrypt_encrypt(icrypt_job *j, const void *src, void *dest, size_t sz)
-{
- const unsigned char *s = src;
- unsigned char *d = dest;
- int i;
-
- /* --- First, use up bytes in the buffer --- */
-
- while (j->i < BLOWFISH_BLKSIZE && sz > 0) {
- *d++ = j->iv[j->i++] ^= *s++;
- sz--;
- }
- if (!sz) return;
-
- /* --- Now encrypt larger chunks at a time --- */
-
- while (sz >= BLOWFISH_BLKSIZE) {
-
- /* --- Freshen the IV --- */
-
- blowfish_encrypt(&j->k, j->iv, j->iv);
-
- /* --- Now encrypt some more bytes --- */
-
- for (i = 0; i < BLOWFISH_BLKSIZE; i++) {
- *d++ = j->iv[i] ^= *s++;
- }
- sz -= BLOWFISH_BLKSIZE;
- }
- if (!sz) return;
-
- /* --- Do the tail-end bits --- */
-
- blowfish_encrypt(&j->k, j->iv, j->iv);
- j->i = 0;
- while (sz) {
- *d++ = j->iv[j->i++] ^= *s++;
- sz--;
- }
-}
-
-/* --- @icrypt_decrypt@ --- *
- *
- * Arguments: @icrypt_job *j@ = job handle
- * @const void *src@ = pointer to source buffer
- * @void *dest@ = pointer to destination buffer
- * @size_t sz@ = size of buffers to handle
- *
- * Returns: ---
- *
- * Use: Decrypts data from the source to the destination, using
- * the key attached to the job handle.
- */
-
-void icrypt_decrypt(icrypt_job *j, const void *src, void *dest, size_t sz)
-{
- unsigned const char *s = src;
- unsigned char *d = dest;
- int i;
- unsigned char c;
-
- /* --- First, use up bytes in the buffer --- */
-
- while (j->i < BLOWFISH_BLKSIZE && sz > 0) {
- c = *s++;
- *d++ = j->iv[j->i] ^ c;
- j->iv[j->i++] = c;
- sz--;
- }
- if (!sz) return;
-
- /* --- Now encrypt larger chunks at a time --- */
-
- while (sz >= BLOWFISH_BLKSIZE) {
-
- /* --- Freshen the IV --- */
-
- blowfish_encrypt(&j->k, j->iv, j->iv);
-
- /* --- Now encrypt some more bytes --- */
-
- for (i = 0; i < BLOWFISH_BLKSIZE; i++) {
- c = *s++;
- *d++ = j->iv[i] ^ c;
- j->iv[i] = c;
- }
- sz -= BLOWFISH_BLKSIZE;
- }
- if (!sz) return;
-
- /* --- Do the tail-end bits --- */
-
- blowfish_encrypt(&j->k, j->iv, j->iv);
- j->i = 0;
- while (sz) {
- c = *s++;
- *d++ = j->iv[j->i] ^ c;
- j->iv[j->i++] = c;
- sz--;
- }
-}
-
-/* --- @icrypt_reset@ --- *
- *
- * Arguments: @icrypt_job *j@ = pointer to job context block
- * @unsigned char *k@ = pointer to key data, or zero for
- * no change
- * @size_t sz@ = size of the key in bytes
- * @const unsigned char *iv@ = pointer to IV, or zero
- *
- * Returns: ---
- *
- * Use: Alters the context block. This can be used after recovery
- * of a session key, for example.
- */
-
-void icrypt_reset(icrypt_job *j, unsigned char *k,
- size_t sz, const unsigned char *iv)
-{
- if (k)
- blowfish_setKey(&j->k, k, sz);
- if (iv)
- memcpy(j->iv, iv, BLOWFISH_BLKSIZE);
- else {
- unsigned char b[BLOWFISH_BLKSIZE];
- int n = j->i, o = BLOWFISH_BLKSIZE - j->i;
-
- memcpy(b, j->iv, sizeof(b));
- memcpy(j->iv, b + n, o);
- memcpy(j->iv + o, b, n);
- }
- j->i = 8;
-}
-
-/* --- @icrypt_saveIV@ --- *
- *
- * Arguments: @icrypt_job *j@ = pointer to job context block
- * @unsigned char *iv@ = where to store the IV
- *
- * Returns: ---
- *
- * Use: Writes out the job's IV after munging it a little.
- */
-
-void icrypt_saveIV(icrypt_job *j, unsigned char *iv)
-{
- int n = j->i, o = BLOWFISH_BLKSIZE - j->i;
-
- memcpy(j->iv, iv + n, o);
- memcpy(j->iv + o, iv, n);
- blowfish_encrypt(&j->k, iv, iv);
-}
-
-/*----- Test rig ----------------------------------------------------------*/
-
-#ifdef TEST_RIG
-
-#include <errno.h>
-#include <pwd.h>
-#include <unistd.h>
-#include "crypt.h"
-#include "mdwopt.h"
-#include "md5.h"
-#include "utils.h"
-
-void icrypt(icrypt_job *j,
- void (*proc)(icrypt_job *j,
- const void *src,
- void *dest,
- size_t sz),
- FILE *fp)
-{
- char buff[71];
- size_t r;
-
- for (;;) {
- r = fread(buff, 1, sizeof(buff), fp);
- if (!r) break;
- proc(j, buff, buff, r);
- fwrite(buff, 1, r, stdout);
- }
-}
-
-int main(int argc, char *argv[])
-{
- icrypt_job j;
- md5 md;
- void (*proc)(icrypt_job *j,
- const void *src,
- void *dest,
- size_t sz) = icrypt_encrypt;
-
- ego(argv[0]);
-
- for (;;) {
- int i = getopt(argc, argv, "d");
- if (i < 0)
- break;
- if (i == 'd')
- proc = icrypt_decrypt;
- }
-
- {
- char *pass = getpass("Password: ");
- unsigned char k[BLOWFISH_KEYSIZE];
- md5_init(&md);
- md5_buffer(&md, pass, strlen(pass));
- memset(pass, 0, strlen(pass));
- md5_final(&md, k);
-
- icrypt_init(&j, k, BLOWFISH_KEYSIZE, 0);
- }
-
- if (optind >= argc)
- icrypt(&j, proc, stdin);
-
- while (optind < argc) {
- char *p = argv[optind++];
- if (strcmp(p, "-") == 0)
- icrypt(&j, proc, stdin);
- else {
- FILE *fp = fopen(p, "rb");
- if (!fp)
- die("couldn't open `%s': %s", p, strerror(errno));
- icrypt(&j, proc, fp);
- fclose(fp);
- }
- }
-
- return (0);
-}
-
-#endif
-
-/*----- That's all, folks -------------------------------------------------*/
~mdw / become / blobdiff