1295367Sdes/* $OpenBSD: cipher-bf1.c,v 1.7 2015/01/14 10:24:42 markus Exp $ */ 2124208Sdes/* 3124208Sdes * Copyright (c) 2003 Markus Friedl. All rights reserved. 4124208Sdes * 5295367Sdes * Permission to use, copy, modify, and distribute this software for any 6295367Sdes * purpose with or without fee is hereby granted, provided that the above 7295367Sdes * copyright notice and this permission notice appear in all copies. 8124208Sdes * 9124208Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 10124208Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 11124208Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 12124208Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 13124208Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 14124208Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 15124208Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 16124208Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 17124208Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 18124208Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 19124208Sdes */ 20124208Sdes 21124208Sdes#include "includes.h" 22124208Sdes 23323124Sdes#if defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF) 24295367Sdes 25162852Sdes#include <sys/types.h> 26162852Sdes 27162852Sdes#include <stdarg.h> 28162852Sdes#include <string.h> 29162852Sdes 30295367Sdes#include <openssl/evp.h> 31124208Sdes 32181111Sdes#include "openbsd-compat/openssl-compat.h" 33124208Sdes 34124208Sdes/* 35124208Sdes * SSH1 uses a variation on Blowfish, all bytes must be swapped before 36124208Sdes * and after encryption/decryption. Thus the swap_bytes stuff (yuk). 37124208Sdes */ 38124208Sdes 39124208Sdesconst EVP_CIPHER * evp_ssh1_bf(void); 40124208Sdes 41124208Sdesstatic void 42124208Sdesswap_bytes(const u_char *src, u_char *dst, int n) 43124208Sdes{ 44124208Sdes u_char c[4]; 45124208Sdes 46124208Sdes /* Process 4 bytes every lap. */ 47124208Sdes for (n = n / 4; n > 0; n--) { 48124208Sdes c[3] = *src++; 49124208Sdes c[2] = *src++; 50124208Sdes c[1] = *src++; 51124208Sdes c[0] = *src++; 52124208Sdes 53124208Sdes *dst++ = c[0]; 54124208Sdes *dst++ = c[1]; 55124208Sdes *dst++ = c[2]; 56124208Sdes *dst++ = c[3]; 57124208Sdes } 58124208Sdes} 59124208Sdes 60124208Sdes#ifdef SSH_OLD_EVP 61124208Sdesstatic void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key, 62124208Sdes const unsigned char *iv, int enc) 63124208Sdes{ 64124208Sdes if (iv != NULL) 65124208Sdes memcpy (&(ctx->oiv[0]), iv, 8); 66124208Sdes memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8); 67124208Sdes if (key != NULL) 68124208Sdes BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx), 69124208Sdes key); 70124208Sdes} 71124208Sdes#endif 72124208Sdes 73221420Sdesstatic int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, 74221420Sdes const u_char *, LIBCRYPTO_EVP_INL_TYPE) = NULL; 75124208Sdes 76124208Sdesstatic int 77221420Sdesbf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, 78221420Sdes LIBCRYPTO_EVP_INL_TYPE len) 79124208Sdes{ 80124208Sdes int ret; 81124208Sdes 82124208Sdes swap_bytes(in, out, len); 83124208Sdes ret = (*orig_bf)(ctx, out, out, len); 84124208Sdes swap_bytes(out, out, len); 85124208Sdes return (ret); 86124208Sdes} 87124208Sdes 88124208Sdesconst EVP_CIPHER * 89124208Sdesevp_ssh1_bf(void) 90124208Sdes{ 91124208Sdes static EVP_CIPHER ssh1_bf; 92124208Sdes 93124208Sdes memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER)); 94124208Sdes orig_bf = ssh1_bf.do_cipher; 95124208Sdes ssh1_bf.nid = NID_undef; 96124208Sdes#ifdef SSH_OLD_EVP 97124208Sdes ssh1_bf.init = bf_ssh1_init; 98124208Sdes#endif 99124208Sdes ssh1_bf.do_cipher = bf_ssh1_cipher; 100124208Sdes ssh1_bf.key_len = 32; 101124208Sdes return (&ssh1_bf); 102124208Sdes} 103323124Sdes#endif /* defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF) */ 104