1 /*- 2 * Copyright (c) 2000-2015 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 #ifndef SYS_DEV_RANDOM_HASH_H_INCLUDED 28 #define SYS_DEV_RANDOM_HASH_H_INCLUDED 29 30 #include <crypto/chacha20/_chacha.h> 31 #include <dev/random/uint128.h> 32 33 #ifndef _KERNEL 34 #define __read_frequently 35 #endif 36 37 /* Keys are formed from cipher blocks */ 38 #define RANDOM_KEYSIZE 32 /* (in bytes) == 256 bits */ 39 #define RANDOM_KEYSIZE_WORDS (RANDOM_KEYSIZE/sizeof(uint32_t)) 40 #define RANDOM_BLOCKSIZE 16 /* (in bytes) == 128 bits */ 41 #define RANDOM_BLOCKSIZE_WORDS (RANDOM_BLOCKSIZE/sizeof(uint32_t)) 42 #define RANDOM_KEYS_PER_BLOCK (RANDOM_KEYSIZE/RANDOM_BLOCKSIZE) 43 44 /* The size of the zero block portion used to form H_d(m) */ 45 #define RANDOM_ZERO_BLOCKSIZE 64 /* (in bytes) == 512 zero bits */ 46 47 struct randomdev_hash { 48 SHA256_CTX sha; 49 }; 50 51 union randomdev_key { 52 struct { 53 keyInstance key; /* Key schedule */ 54 cipherInstance cipher; /* Rijndael internal */ 55 }; 56 struct chacha_ctx chacha; 57 }; 58 59 extern bool random_chachamode; 60 61 void randomdev_hash_init(struct randomdev_hash *); 62 void randomdev_hash_iterate(struct randomdev_hash *, const void *, size_t); 63 void randomdev_hash_finish(struct randomdev_hash *, void *); 64 65 void randomdev_encrypt_init(union randomdev_key *, const void *); 66 void randomdev_keystream(union randomdev_key *context, uint128_t *, void *, size_t); 67 void randomdev_getkey(union randomdev_key *, const void **, size_t *); 68 69 #endif /* SYS_DEV_RANDOM_HASH_H_INCLUDED */ 70