crypto.h revision 1.14
1/* $OpenBSD: crypto.h,v 1.14 2004/05/14 08:42:56 hshoexer Exp $ */ 2/* $EOM: crypto.h,v 1.12 2000/10/15 21:56:41 niklas Exp $ */ 3 4/* 5 * Copyright (c) 1998 Niels Provos. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28/* 29 * This code was written under funding by Ericsson Radio Systems. 30 */ 31 32#ifndef _CRYPTO_H_ 33#define _CRYPTO_H_ 34 35#if defined (__APPLE__) 36 37#include <openssl/des.h> 38#ifdef USE_BLOWFISH 39#include <openssl/blowfish.h> 40#endif 41#ifdef USE_CAST 42#include <openssl/cast.h> 43#endif 44 45#else 46 47#include <des.h> 48#ifdef USE_BLOWFISH 49#include <blf.h> 50#endif 51#ifdef USE_CAST 52#include <cast.h> 53#endif 54 55#endif /* __APPLE__ */ 56 57#ifdef USE_AES 58#include <openssl/aes.h> 59#endif 60 61#define USE_32BIT 62#if defined (USE_64BIT) 63 64#define XOR64(x,y) *(u_int64_t *)(x) ^= *(u_int64_t *)(y); 65#define SET64(x,y) *(u_int64_t *)(x) = *(u_int64_t *)(y); 66 67#elif defined (USE_32BIT) 68 69#define XOR64(x,y) *(u_int32_t *)(x) ^= *(u_int32_t *)(y); \ 70 *(u_int32_t *)((u_int8_t *)(x) + 4) ^= *(u_int32_t *)((u_int8_t *)(y) + 4); 71#define SET64(x,y) *(u_int32_t *)(x) = *(u_int32_t *)(y); \ 72 *(u_int32_t *)((u_int8_t *)(x) + 4) = *(u_int32_t *)((u_int8_t *)(y) + 4); 73 74#else 75 76#define XOR8(x,y,i) (x)[i] ^= (y)[i]; 77#define XOR64(x,y) XOR8(x,y,0); XOR8(x,y,1); XOR8(x,y,2); XOR8(x,y,3); \ 78 XOR8(x,y,4); XOR8(x,y,5); XOR8(x,y,6); XOR8(x,y,7); 79#define SET8(x,y,i) (x)[i] = (y)[i]; 80#define SET64(x,y) SET8(x,y,0); SET8(x,y,1); SET8(x,y,2); SET8(x,y,3); \ 81 SET8(x,y,4); SET8(x,y,5); SET8(x,y,6); SET8(x,y,7); 82 83#endif /* USE_64BIT */ 84 85#define SET_32BIT_BIG(x,y) (x)[3]= (y); (x)[2]= (y) >> 8; \ 86 (x)[1] = (y) >> 16; (x)[0]= (y) >> 24; 87#define GET_32BIT_BIG(x) (u_int32_t)(x)[3] | ((u_int32_t)(x)[2] << 8) | \ 88 ((u_int32_t)(x)[1] << 16)| ((u_int32_t)(x)[0] << 24); 89 90/* 91 * This is standard for all block ciphers we use at the moment. 92 * Keep MAXBLK uptodate. 93 */ 94#define BLOCKSIZE 8 95 96#ifdef USE_AES 97#define MAXBLK AES_BLOCK_SIZE 98#else 99#define MAXBLK BLOCKSIZE 100#endif 101 102struct keystate { 103 struct crypto_xf *xf; /* Back pointer */ 104 u_int16_t ebytes; /* Number of encrypted bytes */ 105 u_int16_t dbytes; /* Number of decrypted bytes */ 106 time_t life; /* Creation time */ 107 u_int8_t iv[MAXBLK]; /* Next IV to use */ 108 u_int8_t iv2[MAXBLK]; 109 u_int8_t *riv, *liv; 110 union { 111 des_key_schedule desks[3]; 112#ifdef USE_BLOWFISH 113 blf_ctx blfks; 114#endif 115#ifdef USE_CAST 116 cast_key castks; 117#endif 118#ifdef USE_AES 119 AES_KEY aesks[2]; 120#endif 121 } keydata; 122}; 123 124#define ks_des keydata.desks 125#define ks_blf keydata.blfks 126#define ks_cast keydata.castks 127#define ks_aes keydata.aesks 128 129/* 130 * Information about the cryptotransform. 131 * 132 * XXX - In regards to the IV (Initialization Vector) the drafts are 133 * completly fucked up and specify a MUST as how it is derived, so 134 * we also have to provide for that. I just don't know where. 135 * Furthermore is this enum needed at all? It seems to be Oakley IDs 136 * only anyhow, and we already have defines for that in ipsec_doi.h. 137 */ 138enum transform { 139 DES_CBC = 1, /* This is a MUST */ 140 IDEA_CBC = 2, /* Licensed, DONT use */ 141 BLOWFISH_CBC = 3, 142 RC5_R16_B64_CBC = 4, /* Licensed, DONT use */ 143 TRIPLEDES_CBC = 5, /* This is a SHOULD */ 144 CAST_CBC = 6, 145 AES_CBC = 7 146}; 147 148enum cryptoerr { 149 EOKAY, /* No error */ 150 ENOCRYPTO, /* A none crypto related error, see errno */ 151 EWEAKKEY, /* A weak key was found in key setup */ 152 EKEYLEN /* The key length was invalid for the cipher */ 153}; 154 155struct crypto_xf { 156 enum transform id; /* Oakley ID */ 157 char *name; /* Transform Name */ 158 u_int16_t keymin, keymax; /* Possible Keying Bytes */ 159 u_int16_t blocksize; /* Need to keep IV in the state */ 160 struct keystate *state; /* Key information, can also be passed sep. */ 161 enum cryptoerr (*init)(struct keystate *, u_int8_t *, u_int16_t); 162 void (*encrypt)(struct keystate *, u_int8_t *, u_int16_t); 163 void (*decrypt)(struct keystate *, u_int8_t *, u_int16_t); 164}; 165 166extern struct keystate *crypto_clone_keystate(struct keystate *); 167extern void crypto_decrypt(struct keystate *, u_int8_t *, u_int16_t); 168extern void crypto_encrypt(struct keystate *, u_int8_t *, u_int16_t); 169extern struct crypto_xf *crypto_get(enum transform); 170extern struct keystate *crypto_init(struct crypto_xf *, u_int8_t *, u_int16_t, 171 enum cryptoerr *); 172extern void crypto_init_iv(struct keystate *, u_int8_t *, size_t); 173extern void crypto_update_iv(struct keystate *); 174 175#endif /* _CRYPTO_H_ */ 176