mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/* $OpenBSD: cipher-bf1.c,v 1.6 2010/10/01 23:05:32 djm Exp $ */
|
|
/*
|
|
* Copyright (c) 2003 Markus Friedl. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
|
|
#include "xmalloc.h"
|
|
#include "log.h"
|
|
|
|
#include "openbsd-compat/openssl-compat.h"
|
|
|
|
/*
|
|
* SSH1 uses a variation on Blowfish, all bytes must be swapped before
|
|
* and after encryption/decryption. Thus the swap_bytes stuff (yuk).
|
|
*/
|
|
|
|
const EVP_CIPHER * evp_ssh1_bf(void);
|
|
|
|
static void
|
|
swap_bytes(const u_char *src, u_char *dst, int n)
|
|
{
|
|
u_char c[4];
|
|
|
|
/* Process 4 bytes every lap. */
|
|
for (n = n / 4; n > 0; n--) {
|
|
c[3] = *src++;
|
|
c[2] = *src++;
|
|
c[1] = *src++;
|
|
c[0] = *src++;
|
|
|
|
*dst++ = c[0];
|
|
*dst++ = c[1];
|
|
*dst++ = c[2];
|
|
*dst++ = c[3];
|
|
}
|
|
}
|
|
|
|
#ifdef SSH_OLD_EVP
|
|
static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key,
|
|
const unsigned char *iv, int enc)
|
|
{
|
|
if (iv != NULL)
|
|
memcpy (&(ctx->oiv[0]), iv, 8);
|
|
memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8);
|
|
if (key != NULL)
|
|
BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx),
|
|
key);
|
|
}
|
|
#endif
|
|
|
|
static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *,
|
|
const u_char *, LIBCRYPTO_EVP_INL_TYPE) = NULL;
|
|
|
|
static int
|
|
bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in,
|
|
LIBCRYPTO_EVP_INL_TYPE len)
|
|
{
|
|
int ret;
|
|
|
|
swap_bytes(in, out, len);
|
|
ret = (*orig_bf)(ctx, out, out, len);
|
|
swap_bytes(out, out, len);
|
|
return (ret);
|
|
}
|
|
|
|
const EVP_CIPHER *
|
|
evp_ssh1_bf(void)
|
|
{
|
|
static EVP_CIPHER ssh1_bf;
|
|
|
|
memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
|
|
orig_bf = ssh1_bf.do_cipher;
|
|
ssh1_bf.nid = NID_undef;
|
|
#ifdef SSH_OLD_EVP
|
|
ssh1_bf.init = bf_ssh1_init;
|
|
#endif
|
|
ssh1_bf.do_cipher = bf_ssh1_cipher;
|
|
ssh1_bf.key_len = 32;
|
|
return (&ssh1_bf);
|
|
}
|