markus@openbsd.org | 60c2c4e | 2015-01-14 10:24:42 +0000 | [diff] [blame] | 1 | /* $OpenBSD: cipher-bf1.c,v 1.7 2015/01/14 10:24:42 markus Exp $ */ |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2003 Markus Friedl. All rights reserved. |
| 4 | * |
markus@openbsd.org | 60c2c4e | 2015-01-14 10:24:42 +0000 | [diff] [blame] | 5 | * Permission to use, copy, modify, and distribute this software for any |
| 6 | * purpose with or without fee is hereby granted, provided that the above |
| 7 | * copyright notice and this permission notice appear in all copies. |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame] | 8 | * |
| 9 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 10 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 11 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 12 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 13 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 14 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 15 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 16 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 17 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 18 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 19 | */ |
| 20 | |
| 21 | #include "includes.h" |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame] | 22 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 23 | #include <sys/types.h> |
| 24 | |
Damien Miller | ded319c | 2006-09-01 15:38:36 +1000 | [diff] [blame] | 25 | #include <stdarg.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 26 | #include <string.h> |
| 27 | |
markus@openbsd.org | 60c2c4e | 2015-01-14 10:24:42 +0000 | [diff] [blame] | 28 | #include <openssl/evp.h> |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 29 | |
Darren Tucker | da05f48 | 2007-03-13 18:50:04 +1100 | [diff] [blame] | 30 | #include "openbsd-compat/openssl-compat.h" |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 31 | |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame] | 32 | /* |
| 33 | * SSH1 uses a variation on Blowfish, all bytes must be swapped before |
| 34 | * and after encryption/decryption. Thus the swap_bytes stuff (yuk). |
| 35 | */ |
| 36 | |
| 37 | const EVP_CIPHER * evp_ssh1_bf(void); |
| 38 | |
| 39 | static void |
| 40 | swap_bytes(const u_char *src, u_char *dst, int n) |
| 41 | { |
| 42 | u_char c[4]; |
| 43 | |
| 44 | /* Process 4 bytes every lap. */ |
| 45 | for (n = n / 4; n > 0; n--) { |
| 46 | c[3] = *src++; |
| 47 | c[2] = *src++; |
| 48 | c[1] = *src++; |
| 49 | c[0] = *src++; |
| 50 | |
| 51 | *dst++ = c[0]; |
| 52 | *dst++ = c[1]; |
| 53 | *dst++ = c[2]; |
| 54 | *dst++ = c[3]; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | #ifdef SSH_OLD_EVP |
| 59 | static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key, |
| 60 | const unsigned char *iv, int enc) |
| 61 | { |
| 62 | if (iv != NULL) |
| 63 | memcpy (&(ctx->oiv[0]), iv, 8); |
| 64 | memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8); |
| 65 | if (key != NULL) |
| 66 | BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx), |
| 67 | key); |
| 68 | } |
| 69 | #endif |
| 70 | |
Damien Miller | 9a3d0dc | 2010-10-07 22:06:42 +1100 | [diff] [blame] | 71 | static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, |
| 72 | const u_char *, LIBCRYPTO_EVP_INL_TYPE) = NULL; |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame] | 73 | |
| 74 | static int |
Damien Miller | 9a3d0dc | 2010-10-07 22:06:42 +1100 | [diff] [blame] | 75 | bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, |
| 76 | LIBCRYPTO_EVP_INL_TYPE len) |
Damien Miller | 3a3261f | 2003-05-15 13:37:19 +1000 | [diff] [blame] | 77 | { |
| 78 | int ret; |
| 79 | |
| 80 | swap_bytes(in, out, len); |
| 81 | ret = (*orig_bf)(ctx, out, out, len); |
| 82 | swap_bytes(out, out, len); |
| 83 | return (ret); |
| 84 | } |
| 85 | |
| 86 | const EVP_CIPHER * |
| 87 | evp_ssh1_bf(void) |
| 88 | { |
| 89 | static EVP_CIPHER ssh1_bf; |
| 90 | |
| 91 | memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER)); |
| 92 | orig_bf = ssh1_bf.do_cipher; |
| 93 | ssh1_bf.nid = NID_undef; |
| 94 | #ifdef SSH_OLD_EVP |
| 95 | ssh1_bf.init = bf_ssh1_init; |
| 96 | #endif |
| 97 | ssh1_bf.do_cipher = bf_ssh1_cipher; |
| 98 | ssh1_bf.key_len = 32; |
| 99 | return (&ssh1_bf); |
| 100 | } |