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 40typedef struct entropy_data { 41 uint32_t *index_ptr; 42 uint32_t buffer[ENTROPY_BUFFER_SIZE]; 43} entropy_data_t; 44 45extern entropy_data_t EntropyData; 46 47/* Trace codes for DBG_SEC_KERNEL: */ 48#define ENTROPY_READ(n) SECURITYDBG_CODE(DBG_SEC_KERNEL, n) /* n: 0 .. 3 */ 49 50/* 51 * Early_random implementation params: */ 52#define EARLY_RANDOM_SEED_SIZE (16) 53#define EARLY_RANDOM_STATE_STATIC_SIZE (256) 54 55#if defined (__x86_64__) 56#define current_prng_context() (current_cpu_datap()->cpu_prng) 57#define master_prng_context() (cpu_datap(master_cpu)->cpu_prng) 58#else 59#error architecture unknown 60#endif 61 62#include <corecrypto/ccdrbg.h> 63#include <corecrypto/ccsha1.h> 64 65typedef struct ccdrbg_info ccdrbg_info_t; 66typedef void (*ccdrbg_factory_t)(ccdrbg_info_t *info, const void *custom); 67 68extern void ccdrbg_factory_yarrow(ccdrbg_info_t *info, const void *custom); 69 70void prng_factory_register(ccdrbg_factory_t factory); 71void prng_cpu_init(int cpu); 72 73void entropy_buffer_read(char *buffer, unsigned int *count); 74void entropy_boot_trace(void); 75 76/* 77 * Wrapper for requesting a CCDRBG operation. 78 * This macro makes the DRBG call with pre-emption disabled to ensure that 79 * any attempt to block will cause a panic. And the operation is timed and 80 * cannot exceed 10msec (for development kernels). 81 * But skip this while we retain Yarrow. 82 */ 83#define YARROW 1 84#if YARROW 85#define PRNG_CCDRBG(op) \ 86MACRO_BEGIN \ 87 op; \ 88MACRO_END 89#else 90#define PRNG_CCDRBG(op) \ 91MACRO_BEGIN \ 92 uint64_t start; \ 93 uint64_t stop; \ 94 disable_preemption(); \ 95 start = mach_absolute_time(); \ 96 op; \ 97 stop = mach_absolute_time(); \ 98 enable_preemption(); \ 99 assert(stop - start < 10*NSEC_PER_MSEC || \ 100 machine_timeout_suspended()); \ 101 (void) start; \ 102 (void) stop; \ 103MACRO_END 104#endif 105 106#endif /* XNU_KERNEL_PRIVATE */ 107 108/* /dev/random's PRNG is reseeded after generating this many bytes: */ 109#define RESEED_BYTES (17597) 110 111__END_DECLS 112 113#endif /* _PRNG_RANDOM_H_ */ 114