/* $OpenBSD: cipher-bf1.c,v 1.7 2015/01/14 10:24:42 markus Exp $ */ /* * Copyright (c) 2003 Markus Friedl. All rights reserved. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * 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" #ifdef WITH_OPENSSL #include <sys/types.h> #include <stdarg.h> #include <string.h> #include <openssl/evp.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); } #endif /* WITH_OPENSSL */