1 /* $OpenBSD: crypto.h,v 1.20 2010/10/19 07:47:34 mikeb 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 #include <openssl/des.h> 36 #include <blf.h> 37 #include <openssl/cast.h> 38 39 #include <openssl/aes.h> 40 41 #define USE_32BIT 42 #if defined (USE_64BIT) 43 44 #define XOR64(x,y) *(u_int64_t *)(x) ^= *(u_int64_t *)(y); 45 #define SET64(x,y) *(u_int64_t *)(x) = *(u_int64_t *)(y); 46 47 #elif defined (USE_32BIT) 48 49 #define XOR64(x,y) *(u_int32_t *)(x) ^= *(u_int32_t *)(y); \ 50 *(u_int32_t *)((u_int8_t *)(x) + 4) ^= *(u_int32_t *)((u_int8_t *)(y) + 4); 51 #define SET64(x,y) *(u_int32_t *)(x) = *(u_int32_t *)(y); \ 52 *(u_int32_t *)((u_int8_t *)(x) + 4) = *(u_int32_t *)((u_int8_t *)(y) + 4); 53 54 #else 55 56 #define XOR8(x,y,i) (x)[i] ^= (y)[i]; 57 #define XOR64(x,y) XOR8(x,y,0); XOR8(x,y,1); XOR8(x,y,2); XOR8(x,y,3); \ 58 XOR8(x,y,4); XOR8(x,y,5); XOR8(x,y,6); XOR8(x,y,7); 59 #define SET8(x,y,i) (x)[i] = (y)[i]; 60 #define SET64(x,y) SET8(x,y,0); SET8(x,y,1); SET8(x,y,2); SET8(x,y,3); \ 61 SET8(x,y,4); SET8(x,y,5); SET8(x,y,6); SET8(x,y,7); 62 63 #endif /* USE_64BIT */ 64 65 #define SET_32BIT_BIG(x,y) (x)[3]= (y); (x)[2]= (y) >> 8; \ 66 (x)[1] = (y) >> 16; (x)[0]= (y) >> 24; 67 #define GET_32BIT_BIG(x) (u_int32_t)(x)[3] | ((u_int32_t)(x)[2] << 8) | \ 68 ((u_int32_t)(x)[1] << 16)| ((u_int32_t)(x)[0] << 24); 69 70 /* 71 * This is standard for all block ciphers we use at the moment. 72 * Keep MAXBLK uptodate. 73 */ 74 #define BLOCKSIZE 8 75 #define MAXBLK AES_BLOCK_SIZE 76 77 struct keystate { 78 struct crypto_xf *xf; /* Back pointer */ 79 u_int8_t iv[MAXBLK]; /* Next IV to use */ 80 u_int8_t iv2[MAXBLK]; 81 u_int8_t *riv, *liv; 82 union { 83 DES_key_schedule desks[3]; 84 blf_ctx blfks; 85 CAST_KEY castks; 86 AES_KEY aesks[2]; 87 } keydata; 88 }; 89 90 #define ks_des keydata.desks 91 #define ks_blf keydata.blfks 92 #define ks_cast keydata.castks 93 #define ks_aes keydata.aesks 94 95 /* 96 * Information about the cryptotransform. 97 * 98 * XXX - In regards to the IV (Initialization Vector) the drafts are 99 * completely fucked up and specify a MUST as how it is derived, so 100 * we also have to provide for that. I just don't know where. 101 * Furthermore is this enum needed at all? It seems to be Oakley IDs 102 * only anyhow, and we already have defines for that in ipsec_doi.h. 103 */ 104 enum transform { 105 DES_CBC = 1, /* This is a MUST */ 106 IDEA_CBC = 2, /* Licensed, DONT use */ 107 BLOWFISH_CBC = 3, 108 RC5_R16_B64_CBC = 4, /* Licensed, DONT use */ 109 TRIPLEDES_CBC = 5, /* This is a SHOULD */ 110 CAST_CBC = 6, 111 AES_CBC = 7 112 }; 113 114 enum cryptoerr { 115 EOKAY, /* No error */ 116 ENOCRYPTO, /* A none crypto related error, see errno */ 117 EWEAKKEY, /* A weak key was found in key setup */ 118 EKEYLEN /* The key length was invalid for the cipher */ 119 }; 120 121 struct crypto_xf { 122 enum transform id; /* Oakley ID */ 123 char *name; /* Transform Name */ 124 u_int16_t keymin, keymax; /* Possible Keying Bytes */ 125 u_int16_t blocksize; /* Need to keep IV in the state */ 126 struct keystate *state; /* Key information, can also be passed sep. */ 127 enum cryptoerr (*init)(struct keystate *, u_int8_t *, u_int16_t); 128 void (*encrypt)(struct keystate *, u_int8_t *, u_int16_t); 129 void (*decrypt)(struct keystate *, u_int8_t *, u_int16_t); 130 }; 131 132 extern struct keystate *crypto_clone_keystate(struct keystate *); 133 extern void crypto_decrypt(struct keystate *, u_int8_t *, u_int16_t); 134 extern void crypto_encrypt(struct keystate *, u_int8_t *, u_int16_t); 135 extern struct crypto_xf *crypto_get(enum transform); 136 extern struct keystate *crypto_init(struct crypto_xf *, u_int8_t *, u_int16_t, 137 enum cryptoerr *); 138 extern void crypto_init_iv(struct keystate *, u_int8_t *, size_t); 139 extern void crypto_update_iv(struct keystate *); 140 141 #endif /* _CRYPTO_H_ */ 142