| 1 | /* $NetBSD: cprng.h,v 1.12 2015/04/13 15:51:30 riastradh Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2011-2013 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Thor Lancelot Simon and Taylor R. Campbell. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * XXX Don't change this to _SYS_CPRNG_H or anything -- code outside |
| 34 | * this file relies on its name... (I'm looking at you, ipf!) |
| 35 | */ |
| 36 | #ifndef _CPRNG_H |
| 37 | #define _CPRNG_H |
| 38 | |
| 39 | #include <sys/types.h> |
| 40 | |
| 41 | #include <crypto/nist_ctr_drbg/nist_ctr_drbg.h> |
| 42 | #include <crypto/cprng_fast/cprng_fast.h> |
| 43 | |
| 44 | /* |
| 45 | * NIST SP800-90 says 2^19 bytes per request for the CTR_DRBG. |
| 46 | */ |
| 47 | #define CPRNG_MAX_LEN 524288 |
| 48 | |
| 49 | typedef struct cprng_strong cprng_strong_t; |
| 50 | |
| 51 | void cprng_init(void); |
| 52 | |
| 53 | #define CPRNG_INIT_ANY 0x00000001 |
| 54 | #define CPRNG_REKEY_ANY 0x00000002 |
| 55 | #define CPRNG_USE_CV 0x00000004 |
| 56 | #define CPRNG_HARD 0x00000008 |
| 57 | #define CPRNG_FMT "\177\020\ |
| 58 | b\0INIT_ANY\0\ |
| 59 | b\1REKEY_ANY\0\ |
| 60 | b\2USE_CV\0\ |
| 61 | b\3HARD\0" |
| 62 | |
| 63 | cprng_strong_t * |
| 64 | cprng_strong_create(const char *, int, int); |
| 65 | void cprng_strong_destroy(cprng_strong_t *); |
| 66 | size_t cprng_strong(cprng_strong_t *, void *, size_t, int); |
| 67 | |
| 68 | struct knote; /* XXX temp, for /dev/random */ |
| 69 | int cprng_strong_kqfilter(cprng_strong_t *, struct knote *); /* XXX " */ |
| 70 | int cprng_strong_poll(cprng_strong_t *, int); /* XXX " */ |
| 71 | |
| 72 | extern cprng_strong_t *kern_cprng; |
| 73 | |
| 74 | static inline uint32_t |
| 75 | cprng_strong32(void) |
| 76 | { |
| 77 | uint32_t r; |
| 78 | cprng_strong(kern_cprng, &r, sizeof(r), 0); |
| 79 | return r; |
| 80 | } |
| 81 | |
| 82 | static inline uint64_t |
| 83 | cprng_strong64(void) |
| 84 | { |
| 85 | uint64_t r; |
| 86 | cprng_strong(kern_cprng, &r, sizeof(r), 0); |
| 87 | return r; |
| 88 | } |
| 89 | |
| 90 | static inline unsigned int |
| 91 | cprng_strong_strength(cprng_strong_t *c) |
| 92 | { |
| 93 | return NIST_BLOCK_KEYLEN_BYTES; |
| 94 | } |
| 95 | |
| 96 | #endif /* _CPRNG_H */ |
| 97 | |