1 /*- 2 * Copyright (c) 2000-2013 Mark R V Murray 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 34 #include <crypto/rijndael/rijndael-api-fst.h> 35 #include <crypto/sha2/sha2.h> 36 37 #include <dev/random/hash.h> 38 39 /* Initialise the hash */ 40 void 41 randomdev_hash_init(struct randomdev_hash *context) 42 { 43 SHA256_Init(&context->sha); 44 } 45 46 /* Iterate the hash */ 47 void 48 randomdev_hash_iterate(struct randomdev_hash *context, void *data, size_t size) 49 { 50 SHA256_Update(&context->sha, data, size); 51 } 52 53 /* Conclude by returning the hash in the supplied <*buf> which must be 54 * KEYSIZE bytes long. 55 */ 56 void 57 randomdev_hash_finish(struct randomdev_hash *context, void *buf) 58 { 59 SHA256_Final(buf, &context->sha); 60 } 61 62 /* Initialise the encryption routine by setting up the key schedule 63 * from the supplied <*data> which must be KEYSIZE bytes of binary 64 * data. Use CBC mode for better avalanche. 65 */ 66 void 67 randomdev_encrypt_init(struct randomdev_key *context, void *data) 68 { 69 rijndael_cipherInit(&context->cipher, MODE_CBC, NULL); 70 rijndael_makeKey(&context->key, DIR_ENCRYPT, KEYSIZE*8, data); 71 } 72 73 /* Encrypt the supplied data using the key schedule preset in the context. 74 * <length> bytes are encrypted from <*d_in> to <*d_out>. <length> must be 75 * a multiple of BLOCKSIZE. 76 */ 77 void 78 randomdev_encrypt(struct randomdev_key *context, void *d_in, void *d_out, unsigned length) 79 { 80 rijndael_blockEncrypt(&context->cipher, &context->key, d_in, length*8, d_out); 81 } 82