1 /* $OpenBSD: xform.c,v 1.16 2001/08/28 12:20:43 ben Exp $ */ 2 /*- 3 * The authors of this code are John Ioannidis (ji@tla.org), 4 * Angelos D. Keromytis (kermit@csd.uch.gr), 5 * Niels Provos (provos@physnet.uni-hamburg.de) and 6 * Damien Miller (djm@mindrot.org). 7 * 8 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 9 * in November 1995. 10 * 11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 12 * by Angelos D. Keromytis. 13 * 14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 15 * and Niels Provos. 16 * 17 * Additional features in 1999 by Angelos D. Keromytis. 18 * 19 * AES XTS implementation in 2008 by Damien Miller 20 * 21 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 22 * Angelos D. Keromytis and Niels Provos. 23 * 24 * Copyright (C) 2001, Angelos D. Keromytis. 25 * 26 * Copyright (C) 2008, Damien Miller 27 * Copyright (c) 2014 The FreeBSD Foundation 28 * All rights reserved. 29 * 30 * Portions of this software were developed by John-Mark Gurney 31 * under sponsorship of the FreeBSD Foundation and 32 * Rubicon Communications, LLC (Netgate). 33 * 34 * Permission to use, copy, and modify this software with or without fee 35 * is hereby granted, provided that this entire notice is included in 36 * all copies of any software which is or includes a copy or 37 * modification of this software. 38 * You may use this code under the GNU public license if you so wish. Please 39 * contribute changes back to the authors under this freer than GPL license 40 * so that we may further the use of strong encryption without limitations to 41 * all. 42 * 43 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 44 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 45 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 46 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 47 * PURPOSE. 48 */ 49 50 #include <sys/cdefs.h> 51 __FBSDID("$FreeBSD$"); 52 53 #include <opencrypto/xform_auth.h> 54 #include <opencrypto/xform_enc.h> 55 56 static int null_setkey(u_int8_t **, u_int8_t *, int); 57 static void null_encrypt(caddr_t, u_int8_t *); 58 static void null_decrypt(caddr_t, u_int8_t *); 59 static void null_zerokey(u_int8_t **); 60 61 static void null_init(void *); 62 static void null_reinit(void *ctx, const u_int8_t *buf, u_int16_t len); 63 static int null_update(void *, const u_int8_t *, u_int16_t); 64 static void null_final(u_int8_t *, void *); 65 66 /* Encryption instances */ 67 struct enc_xform enc_xform_null = { 68 CRYPTO_NULL_CBC, "NULL", 69 /* NB: blocksize of 4 is to generate a properly aligned ESP header */ 70 NULL_BLOCK_LEN, 0, NULL_MIN_KEY, NULL_MAX_KEY, 71 null_encrypt, 72 null_decrypt, 73 null_setkey, 74 null_zerokey, 75 NULL, 76 }; 77 78 /* Authentication instances */ 79 struct auth_hash auth_hash_null = { /* NB: context isn't used */ 80 CRYPTO_NULL_HMAC, "NULL-HMAC", 81 NULL_HMAC_KEY_LEN, NULL_HASH_LEN, sizeof(int), NULL_HMAC_BLOCK_LEN, 82 null_init, null_reinit, null_reinit, null_update, null_final 83 }; 84 85 /* 86 * Encryption wrapper routines. 87 */ 88 static void 89 null_encrypt(caddr_t key, u_int8_t *blk) 90 { 91 } 92 93 static void 94 null_decrypt(caddr_t key, u_int8_t *blk) 95 { 96 } 97 98 static int 99 null_setkey(u_int8_t **sched, u_int8_t *key, int len) 100 { 101 *sched = NULL; 102 return 0; 103 } 104 105 static void 106 null_zerokey(u_int8_t **sched) 107 { 108 *sched = NULL; 109 } 110 111 /* 112 * And now for auth. 113 */ 114 115 static void 116 null_init(void *ctx) 117 { 118 } 119 120 static void 121 null_reinit(void *ctx, const u_int8_t *buf, u_int16_t len) 122 { 123 } 124 125 static int 126 null_update(void *ctx, const u_int8_t *buf, u_int16_t len) 127 { 128 return 0; 129 } 130 131 static void 132 null_final(u_int8_t *buf, void *ctx) 133 { 134 if (buf != (u_int8_t *) 0) 135 bzero(buf, 12); 136 } 137