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(void *, const uint8_t *, int); 57 static void null_crypt(void *, const uint8_t *, uint8_t *); 58 static void null_crypt_multi(void *, const uint8_t *, uint8_t *, size_t); 59 60 static void null_init(void *); 61 static void null_reinit(void *ctx, const uint8_t *buf, u_int len); 62 static int null_update(void *, const void *, u_int); 63 static void null_final(uint8_t *, void *); 64 65 /* Encryption instances */ 66 const struct enc_xform enc_xform_null = { 67 .type = CRYPTO_NULL_CBC, 68 .name = "NULL", 69 /* NB: blocksize of 4 is to generate a properly aligned ESP header */ 70 .blocksize = NULL_BLOCK_LEN, 71 .ivsize = 0, 72 .minkey = NULL_MIN_KEY, 73 .maxkey = NULL_MAX_KEY, 74 .setkey = null_setkey, 75 .encrypt = null_crypt, 76 .decrypt = null_crypt, 77 .encrypt_multi = null_crypt_multi, 78 .decrypt_multi = null_crypt_multi, 79 }; 80 81 /* Authentication instances */ 82 const struct auth_hash auth_hash_null = { 83 .type = CRYPTO_NULL_HMAC, 84 .name = "NULL-HMAC", 85 .keysize = 0, 86 .hashsize = NULL_HASH_LEN, 87 .ctxsize = sizeof(int), /* NB: context isn't used */ 88 .blocksize = NULL_HMAC_BLOCK_LEN, 89 .Init = null_init, 90 .Setkey = null_reinit, 91 .Reinit = null_reinit, 92 .Update = null_update, 93 .Final = null_final, 94 }; 95 96 /* 97 * Encryption wrapper routines. 98 */ 99 static void 100 null_crypt(void *key, const uint8_t *in, uint8_t *out) 101 { 102 } 103 104 static void 105 null_crypt_multi(void *key, const uint8_t *in, uint8_t *out, size_t len) 106 { 107 } 108 109 static int 110 null_setkey(void *sched, const uint8_t *key, int len) 111 { 112 return (0); 113 } 114 115 /* 116 * And now for auth. 117 */ 118 119 static void 120 null_init(void *ctx) 121 { 122 } 123 124 static void 125 null_reinit(void *ctx, const uint8_t *buf, u_int len) 126 { 127 } 128 129 static int 130 null_update(void *ctx, const void *buf, u_int len) 131 { 132 return 0; 133 } 134 135 static void 136 null_final(uint8_t *buf, void *ctx) 137 { 138 bzero(buf, NULL_HASH_LEN); 139 } 140