1221420Sdes/* $OpenBSD: cipher-bf1.c,v 1.6 2010/10/01 23:05:32 djm Exp $ */ 2124208Sdes/* 3124208Sdes * Copyright (c) 2003 Markus Friedl. All rights reserved. 4124208Sdes * 5124208Sdes * Redistribution and use in source and binary forms, with or without 6124208Sdes * modification, are permitted provided that the following conditions 7124208Sdes * are met: 8124208Sdes * 1. Redistributions of source code must retain the above copyright 9124208Sdes * notice, this list of conditions and the following disclaimer. 10124208Sdes * 2. Redistributions in binary form must reproduce the above copyright 11124208Sdes * notice, this list of conditions and the following disclaimer in the 12124208Sdes * documentation and/or other materials provided with the distribution. 13124208Sdes * 14124208Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15124208Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16124208Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17124208Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18124208Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19124208Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20124208Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21124208Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22124208Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23124208Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24124208Sdes */ 25124208Sdes 26124208Sdes#include "includes.h" 27124208Sdes 28162852Sdes#include <sys/types.h> 29162852Sdes 30124208Sdes#include <openssl/evp.h> 31162852Sdes 32162852Sdes#include <stdarg.h> 33162852Sdes#include <string.h> 34162852Sdes 35124208Sdes#include "xmalloc.h" 36124208Sdes#include "log.h" 37124208Sdes 38181111Sdes#include "openbsd-compat/openssl-compat.h" 39124208Sdes 40124208Sdes/* 41124208Sdes * SSH1 uses a variation on Blowfish, all bytes must be swapped before 42124208Sdes * and after encryption/decryption. Thus the swap_bytes stuff (yuk). 43124208Sdes */ 44124208Sdes 45124208Sdesconst EVP_CIPHER * evp_ssh1_bf(void); 46124208Sdes 47124208Sdesstatic void 48124208Sdesswap_bytes(const u_char *src, u_char *dst, int n) 49124208Sdes{ 50124208Sdes u_char c[4]; 51124208Sdes 52124208Sdes /* Process 4 bytes every lap. */ 53124208Sdes for (n = n / 4; n > 0; n--) { 54124208Sdes c[3] = *src++; 55124208Sdes c[2] = *src++; 56124208Sdes c[1] = *src++; 57124208Sdes c[0] = *src++; 58124208Sdes 59124208Sdes *dst++ = c[0]; 60124208Sdes *dst++ = c[1]; 61124208Sdes *dst++ = c[2]; 62124208Sdes *dst++ = c[3]; 63124208Sdes } 64124208Sdes} 65124208Sdes 66124208Sdes#ifdef SSH_OLD_EVP 67124208Sdesstatic void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key, 68124208Sdes const unsigned char *iv, int enc) 69124208Sdes{ 70124208Sdes if (iv != NULL) 71124208Sdes memcpy (&(ctx->oiv[0]), iv, 8); 72124208Sdes memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8); 73124208Sdes if (key != NULL) 74124208Sdes BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx), 75124208Sdes key); 76124208Sdes} 77124208Sdes#endif 78124208Sdes 79221420Sdesstatic int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, 80221420Sdes const u_char *, LIBCRYPTO_EVP_INL_TYPE) = NULL; 81124208Sdes 82124208Sdesstatic int 83221420Sdesbf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, 84221420Sdes LIBCRYPTO_EVP_INL_TYPE len) 85124208Sdes{ 86124208Sdes int ret; 87124208Sdes 88124208Sdes swap_bytes(in, out, len); 89124208Sdes ret = (*orig_bf)(ctx, out, out, len); 90124208Sdes swap_bytes(out, out, len); 91124208Sdes return (ret); 92124208Sdes} 93124208Sdes 94124208Sdesconst EVP_CIPHER * 95124208Sdesevp_ssh1_bf(void) 96124208Sdes{ 97124208Sdes static EVP_CIPHER ssh1_bf; 98124208Sdes 99124208Sdes memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER)); 100124208Sdes orig_bf = ssh1_bf.do_cipher; 101124208Sdes ssh1_bf.nid = NID_undef; 102124208Sdes#ifdef SSH_OLD_EVP 103124208Sdes ssh1_bf.init = bf_ssh1_init; 104124208Sdes#endif 105124208Sdes ssh1_bf.do_cipher = bf_ssh1_cipher; 106124208Sdes ssh1_bf.key_len = 32; 107124208Sdes return (&ssh1_bf); 108124208Sdes} 109