fbf945dc88
* src/common/passcrypt.c this 'workaround' not necessary on NetBSD. Thanks to Daniel Gustafson
166 lines
4 KiB
C
166 lines
4 KiB
C
/*
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* Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
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* Copyright (C) 1999-2003 Hiroyuki Yamamoto and the Sylpheed-Claws Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#define _XOPEN_SOURCE
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#include <sys/types.h>
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#include <stdio.h>
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#include <memory.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <unistd.h>
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#if defined (__FreeBSD__)
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#include <rpc/des_crypt.h>
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#endif
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#include <glib.h>
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#include "passcrypt.h"
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void crypt_cfb_buf(const char key[8], unsigned char *buf, unsigned len,
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unsigned chunksize, int decrypt);
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static void crypt_cfb_shift(unsigned char *to,
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const unsigned char *from, unsigned len);
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static void crypt_cfb_xor(unsigned char *to, const unsigned char *from,
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unsigned len);
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static void crypt_unpack(unsigned char *a);
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void passcrypt_encrypt(gchar *password, guint len)
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{
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crypt_cfb_buf(PASSCRYPT_KEY, password, len, 1, 0 );
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}
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void passcrypt_decrypt(gchar *password, guint len)
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{
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crypt_cfb_buf(PASSCRYPT_KEY, password, len, 1, 1 );
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}
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/*
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* crypt_cfb_iv is the intermediate vector used for cypher feedback encryption
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*/
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unsigned char crypt_cfb_iv[64];
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int crypt_cfb_blocksize = 8; /* 8 for DES */
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#if defined (__FreeBSD__)
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void
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crypt_cfb_buf(const char key[8], unsigned char *buf, unsigned len,
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unsigned chunksize, int decrypt)
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{
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char des_key[8];
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strncpy(des_key, PASSCRYPT_KEY, 8);
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des_setparity(des_key);
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if (decrypt)
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ecb_crypt(des_key, buf, len, DES_DECRYPT);
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else
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ecb_crypt(des_key, buf, len, DES_ENCRYPT);
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}
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#else
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void
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crypt_cfb_buf(const char key[8], unsigned char *buf, unsigned len,
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unsigned chunksize, int decrypt)
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{
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unsigned char temp[64];
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memcpy(temp, key, 8);
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crypt_unpack(temp);
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setkey((const char *) temp);
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memset(temp, 0, sizeof(temp));
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memset(crypt_cfb_iv, 0, sizeof(crypt_cfb_iv));
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if (chunksize > crypt_cfb_blocksize)
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chunksize = crypt_cfb_blocksize;
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while (len) {
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memcpy(temp, crypt_cfb_iv, sizeof(temp));
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encrypt((char *) temp, 0);
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if (chunksize > len)
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chunksize = len;
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if (decrypt)
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crypt_cfb_shift(crypt_cfb_iv, buf, chunksize);
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crypt_cfb_xor((unsigned char *) buf, temp, chunksize);
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if (!decrypt)
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crypt_cfb_shift(crypt_cfb_iv, buf, chunksize);
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len -= chunksize;
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buf += chunksize;
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}
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}
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#endif
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/*
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* Shift len bytes from end of to buffer to beginning, then put len
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* bytes from from at the end. Caution: the to buffer is unpacked,
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* but the from buffer is not.
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*/
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static void
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crypt_cfb_shift(unsigned char *to, const unsigned char *from, unsigned len)
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{
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unsigned i;
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unsigned j;
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unsigned k;
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if (len < crypt_cfb_blocksize) {
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i = len * 8;
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j = crypt_cfb_blocksize * 8;
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for (k = i; k < j; k++) {
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to[0] = to[i];
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++to;
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}
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}
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for (i = 0; i < len; i++) {
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j = *from++;
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for (k = 0x80; k; k >>= 1)
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*to++ = ((j & k) != 0);
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}
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}
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/*
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* XOR len bytes from from into the data at to. Caution: the from buffer
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* is unpacked, but the to buffer is not.
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*/
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static void
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crypt_cfb_xor(unsigned char *to, const unsigned char *from, unsigned len)
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{
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unsigned i;
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unsigned j;
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unsigned char c;
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for (i = 0; i < len; i++) {
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c = 0;
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for (j = 0; j < 8; j++)
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c = (c << 1) | *from++;
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*to++ ^= c;
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}
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}
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/*
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* Take the 8-byte array at *a (must be able to hold 64 bytes!) and unpack
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* each bit into its own byte.
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*/
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static void crypt_unpack(unsigned char *a)
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{
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int i, j;
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for (i = 7; i >= 0; --i)
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for (j = 7; j >= 0; --j)
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a[(i << 3) + j] = (a[i] & (0x80 >> j)) != 0;
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}
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