b7aa600c41
I have worked hard to reduce diffs against the vendor branch. One notable change in that respect is that we no longer prefer DSA over RSA - the reasons for doing so went away years ago. This may cause some surprises, as ssh will warn about unknown host keys even for hosts whose keys haven't changed. MFC after: 6 weeks
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/* $OpenBSD: cipher-bf1.c,v 1.5 2006/08/03 03:34:42 deraadt 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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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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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#include <sys/types.h>
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#include <openssl/evp.h>
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#include <stdarg.h>
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#include <string.h>
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#include "xmalloc.h"
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#include "log.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 *, const u_char *, u_int) = 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, u_int 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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