/* $OpenBSD: crypto.h,v 1.14 2004/05/14 08:42:56 hshoexer Exp $ */ /* $EOM: crypto.h,v 1.12 2000/10/15 21:56:41 niklas Exp $ */ /* * Copyright (c) 1998 Niels Provos. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * This code was written under funding by Ericsson Radio Systems. */ #ifndef _CRYPTO_H_ #define _CRYPTO_H_ #if defined (__APPLE__) #include #ifdef USE_BLOWFISH #include #endif #ifdef USE_CAST #include #endif #else #include #ifdef USE_BLOWFISH #include #endif #ifdef USE_CAST #include #endif #endif /* __APPLE__ */ #ifdef USE_AES #include #endif #define USE_32BIT #if defined (USE_64BIT) #define XOR64(x,y) *(u_int64_t *)(x) ^= *(u_int64_t *)(y); #define SET64(x,y) *(u_int64_t *)(x) = *(u_int64_t *)(y); #elif defined (USE_32BIT) #define XOR64(x,y) *(u_int32_t *)(x) ^= *(u_int32_t *)(y); \ *(u_int32_t *)((u_int8_t *)(x) + 4) ^= *(u_int32_t *)((u_int8_t *)(y) + 4); #define SET64(x,y) *(u_int32_t *)(x) = *(u_int32_t *)(y); \ *(u_int32_t *)((u_int8_t *)(x) + 4) = *(u_int32_t *)((u_int8_t *)(y) + 4); #else #define XOR8(x,y,i) (x)[i] ^= (y)[i]; #define XOR64(x,y) XOR8(x,y,0); XOR8(x,y,1); XOR8(x,y,2); XOR8(x,y,3); \ XOR8(x,y,4); XOR8(x,y,5); XOR8(x,y,6); XOR8(x,y,7); #define SET8(x,y,i) (x)[i] = (y)[i]; #define SET64(x,y) SET8(x,y,0); SET8(x,y,1); SET8(x,y,2); SET8(x,y,3); \ SET8(x,y,4); SET8(x,y,5); SET8(x,y,6); SET8(x,y,7); #endif /* USE_64BIT */ #define SET_32BIT_BIG(x,y) (x)[3]= (y); (x)[2]= (y) >> 8; \ (x)[1] = (y) >> 16; (x)[0]= (y) >> 24; #define GET_32BIT_BIG(x) (u_int32_t)(x)[3] | ((u_int32_t)(x)[2] << 8) | \ ((u_int32_t)(x)[1] << 16)| ((u_int32_t)(x)[0] << 24); /* * This is standard for all block ciphers we use at the moment. * Keep MAXBLK uptodate. */ #define BLOCKSIZE 8 #ifdef USE_AES #define MAXBLK AES_BLOCK_SIZE #else #define MAXBLK BLOCKSIZE #endif struct keystate { struct crypto_xf *xf; /* Back pointer */ u_int16_t ebytes; /* Number of encrypted bytes */ u_int16_t dbytes; /* Number of decrypted bytes */ time_t life; /* Creation time */ u_int8_t iv[MAXBLK]; /* Next IV to use */ u_int8_t iv2[MAXBLK]; u_int8_t *riv, *liv; union { des_key_schedule desks[3]; #ifdef USE_BLOWFISH blf_ctx blfks; #endif #ifdef USE_CAST cast_key castks; #endif #ifdef USE_AES AES_KEY aesks[2]; #endif } keydata; }; #define ks_des keydata.desks #define ks_blf keydata.blfks #define ks_cast keydata.castks #define ks_aes keydata.aesks /* * Information about the cryptotransform. * * XXX - In regards to the IV (Initialization Vector) the drafts are * completly fucked up and specify a MUST as how it is derived, so * we also have to provide for that. I just don't know where. * Furthermore is this enum needed at all? It seems to be Oakley IDs * only anyhow, and we already have defines for that in ipsec_doi.h. */ enum transform { DES_CBC = 1, /* This is a MUST */ IDEA_CBC = 2, /* Licensed, DONT use */ BLOWFISH_CBC = 3, RC5_R16_B64_CBC = 4, /* Licensed, DONT use */ TRIPLEDES_CBC = 5, /* This is a SHOULD */ CAST_CBC = 6, AES_CBC = 7 }; enum cryptoerr { EOKAY, /* No error */ ENOCRYPTO, /* A none crypto related error, see errno */ EWEAKKEY, /* A weak key was found in key setup */ EKEYLEN /* The key length was invalid for the cipher */ }; struct crypto_xf { enum transform id; /* Oakley ID */ char *name; /* Transform Name */ u_int16_t keymin, keymax; /* Possible Keying Bytes */ u_int16_t blocksize; /* Need to keep IV in the state */ struct keystate *state; /* Key information, can also be passed sep. */ enum cryptoerr (*init)(struct keystate *, u_int8_t *, u_int16_t); void (*encrypt)(struct keystate *, u_int8_t *, u_int16_t); void (*decrypt)(struct keystate *, u_int8_t *, u_int16_t); }; extern struct keystate *crypto_clone_keystate(struct keystate *); extern void crypto_decrypt(struct keystate *, u_int8_t *, u_int16_t); extern void crypto_encrypt(struct keystate *, u_int8_t *, u_int16_t); extern struct crypto_xf *crypto_get(enum transform); extern struct keystate *crypto_init(struct crypto_xf *, u_int8_t *, u_int16_t, enum cryptoerr *); extern void crypto_init_iv(struct keystate *, u_int8_t *, size_t); extern void crypto_update_iv(struct keystate *); #endif /* _CRYPTO_H_ */