1 | /* |
2 | * Copyright (c) 2013 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | |
29 | #ifndef _PRNG_RANDOM_H_ |
30 | #define _PRNG_RANDOM_H_ |
31 | |
32 | __BEGIN_DECLS |
33 | |
34 | #ifdef XNU_KERNEL_PRIVATE |
35 | |
36 | #define ENTROPY_BUFFER_BYTE_SIZE 64 |
37 | |
38 | #define ENTROPY_BUFFER_SIZE (ENTROPY_BUFFER_BYTE_SIZE / sizeof(uint32_t)) |
39 | |
40 | typedef struct entropy_data { |
41 | /* |
42 | * TODO: Should index_ptr be volatile? Are we exposed to any races that |
43 | * we care about if it is not? |
44 | */ |
45 | uint32_t * index_ptr; |
46 | uint32_t buffer[ENTROPY_BUFFER_SIZE]; |
47 | } entropy_data_t; |
48 | |
49 | extern entropy_data_t EntropyData; |
50 | |
51 | /* Trace codes for DBG_SEC_KERNEL: */ |
52 | #define ENTROPY_READ(n) SECURITYDBG_CODE(DBG_SEC_KERNEL, n) /* n: 0 .. 3 */ |
53 | |
54 | /* |
55 | * Early_random implementation params: */ |
56 | #define EARLY_RANDOM_SEED_SIZE (16) |
57 | #define EARLY_RANDOM_STATE_STATIC_SIZE (264) |
58 | |
59 | void early_random_cpu_init(int cpu); |
60 | |
61 | /* |
62 | * Wrapper for requesting a CCKPRNG operation. |
63 | * This macro makes the DRBG call with pre-emption disabled to ensure that |
64 | * any attempt to block will cause a panic. And the operation is timed and |
65 | * cannot exceed 10msec (for development kernels). |
66 | * But skip this while we retain Yarrow. |
67 | */ |
68 | #define YARROW 1 |
69 | #if YARROW |
70 | #define PRNG_CCKPRNG(op) \ |
71 | MACRO_BEGIN \ |
72 | op; \ |
73 | MACRO_END |
74 | #else |
75 | #define PRNG_CCKPRNG(op) \ |
76 | MACRO_BEGIN \ |
77 | uint64_t start; \ |
78 | uint64_t stop; \ |
79 | disable_preemption(); \ |
80 | start = mach_absolute_time(); \ |
81 | op; \ |
82 | stop = mach_absolute_time(); \ |
83 | enable_preemption(); \ |
84 | assert(stop - start < 10 * NSEC_PER_MSEC || machine_timeout_suspended()); \ |
85 | (void)start; \ |
86 | (void)stop; \ |
87 | MACRO_END |
88 | #endif |
89 | |
90 | #endif /* XNU_KERNEL_PRIVATE */ |
91 | |
92 | #include <corecrypto/cckprng.h> |
93 | |
94 | /* kernel prng */ |
95 | typedef const struct prng_fns { |
96 | int (*init)(cckprng_ctx_t ctx, size_t nbytes, const void * seed); |
97 | int (*reseed)(cckprng_ctx_t ctx, size_t nbytes, const void * seed); |
98 | int (*addentropy)(cckprng_ctx_t ctx, size_t nbytes, const void * entropy); |
99 | int (*generate)(cckprng_ctx_t ctx, size_t nbytes, void * out); |
100 | } * prng_fns_t; |
101 | |
102 | void register_and_init_prng(prng_fns_t fns); |
103 | |
104 | #include <kern/simple_lock.h> |
105 | /* Definitions for boolean PRNG */ |
106 | #define RANDOM_BOOL_GEN_SEED_COUNT 4 |
107 | struct bool_gen { |
108 | unsigned int seed[RANDOM_BOOL_GEN_SEED_COUNT]; |
109 | unsigned int state; |
110 | decl_simple_lock_data(, lock) |
111 | }; |
112 | |
113 | extern void random_bool_init(struct bool_gen * bg); |
114 | |
115 | extern void random_bool_gen_entropy(struct bool_gen * bg, unsigned int * buffer, int count); |
116 | |
117 | extern unsigned int random_bool_gen_bits(struct bool_gen * bg, unsigned int * buffer, unsigned int count, unsigned int numbits); |
118 | |
119 | __END_DECLS |
120 | |
121 | #endif /* _PRNG_RANDOM_H_ */ |
122 | |