| /* $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_SSH1 |
| #if defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF) |
| |
| #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 /* defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF) */ |
| |
| #endif /* WITH_SSH1 */ |