/* $OpenBSD: cipher-bf1.c,v 1.7 2015/01/14 10:24:42 markus Exp $ */
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/*
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* Copyright (c) 2003 Markus Friedl. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#ifdef WITH_SSH1
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#if defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF)
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#include <sys/types.h>
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#include <stdarg.h>
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#include <string.h>
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#include <openssl/evp.h>
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#include "openbsd-compat/openssl-compat.h"
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/*
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* SSH1 uses a variation on Blowfish, all bytes must be swapped before
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* and after encryption/decryption. Thus the swap_bytes stuff (yuk).
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*/
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const EVP_CIPHER * evp_ssh1_bf(void);
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static void
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swap_bytes(const u_char *src, u_char *dst, int n)
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{
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u_char c[4];
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/* Process 4 bytes every lap. */
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for (n = n / 4; n > 0; n--) {
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c[3] = *src++;
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c[2] = *src++;
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c[1] = *src++;
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c[0] = *src++;
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*dst++ = c[0];
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*dst++ = c[1];
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*dst++ = c[2];
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*dst++ = c[3];
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}
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}
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#ifdef SSH_OLD_EVP
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static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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if (iv != NULL)
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memcpy (&(ctx->oiv[0]), iv, 8);
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memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8);
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if (key != NULL)
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BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx),
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key);
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}
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#endif
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static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *,
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const u_char *, LIBCRYPTO_EVP_INL_TYPE) = NULL;
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static int
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bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in,
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LIBCRYPTO_EVP_INL_TYPE len)
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{
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int ret;
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swap_bytes(in, out, len);
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ret = (*orig_bf)(ctx, out, out, len);
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swap_bytes(out, out, len);
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return (ret);
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}
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const EVP_CIPHER *
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evp_ssh1_bf(void)
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{
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static EVP_CIPHER ssh1_bf;
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memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
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orig_bf = ssh1_bf.do_cipher;
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ssh1_bf.nid = NID_undef;
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#ifdef SSH_OLD_EVP
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ssh1_bf.init = bf_ssh1_init;
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#endif
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ssh1_bf.do_cipher = bf_ssh1_cipher;
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ssh1_bf.key_len = 32;
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return (&ssh1_bf);
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}
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#endif /* defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF) */
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#endif /* WITH_SSH1 */
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