xnu-2782.1.97.tar.gz

[apple/xnu.git] / osfmk / prng / YarrowCoreLib / src / prngpriv.h

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+/*
+ * Copyright (c) 1999, 2000-2013 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+/*
+       File:           prngpriv.h
+
+       Contains:       Private typedefs and #defines for Counterpane Yarrow PRNG.
+
+       Written by:     Counterpane, Inc. 
+
+       Copyright: (c) 2000 by Apple Computer, Inc., all rights reserved.
+
+       Change History (most recent first):
+
+               02/10/99        dpm             Created, based on Counterpane source.
+ 
+*/
+/*
+       prngpriv.h
+
+       Completely private header for the Counterpane PRNG. Should only be included by prng.c
+*/
+
+#ifndef __YARROW_PRNG_PRIV_H__
+#define __YARROW_PRNG_PRIV_H__
+
+#include "userdefines.h"
+#include "prng/YarrowCoreLib/include/yarrow.h"
+#include "entropysources.h"
+#include "comp.h"
+#include "sha1mod.h"
+#include "smf.h"
+
+#define TOTAL_SOURCES ENTROPY_SOURCES+USER_SOURCES
+
+#ifdef COMPRESSION_ON
+#define COMP_SOURCES TOTAL_SOURCES
+#else
+#define COMP_SOURCES ENTROPY_SOURCES
+#endif
+
+/* Error numbers */
+typedef enum prng_ready_status {
+       PRNG_READY = 33,        /* Compiler will initialize to either 0 or random if allowed to */
+       PRNG_NOT_READY = 0
+} prng_ready_status;
+
+/* Top level output state */
+typedef struct{
+       BYTE IV[20];
+       BYTE out[20];
+       UINT index;                     /* current byte to output */
+       UINT numout;            /* bytes since last prng_make_new_state */ 
+} GEN_CTX;
+
+/* PRNG state structure */
+struct PRNG {
+       /* Output State */
+       GEN_CTX outstate;
+
+       /* Entropy Pools (somewhat unlike a gene pool) */
+       YSHA1_CTX pool;
+       UINT poolSize[TOTAL_SOURCES];                   /* Note that size is in bytes and est in bits */
+       UINT poolEstBits[TOTAL_SOURCES];
+       COMP_CTX comp_state[COMP_SOURCES];
+
+       /* Status Flags */
+       prng_ready_status ready;
+};
+
+/*
+ * Clients see an opaque PrngRef; internal code uses the 
+ * following typedef.
+ */
+typedef struct PRNG PRNG;
+
+
+/* Test Macros */
+#define CHECKSTATE(p) \
+if(p==NULL) {return PRNG_ERR_NOT_READY;} /* Does the state exist? */   \
+if(p->ready != PRNG_READY) {return PRNG_ERR_NOT_READY;}        /* Set error state and return */
+/* To make sure that a pointer isn't NULL */
+#define PCHECK(ptr)  if(ptr==NULL) {return PRNG_ERR_NULL_POINTER;}
+/* To make sure that malloc returned a valid value */
+#define MCHECK(ptr)  if(ptr==NULL) {return PRNG_ERR_LOW_MEMORY;}
+/* To make sure that a given value is non-negative */
+#if            defined(macintosh) || defined(__APPLE__)
+/* original looks like a bogon */
+#define ZCHECK(val)  if(val<0) {return PRNG_ERR_OUT_OF_BOUNDS;}
+#else
+#define ZCHECK(val)  if(p<0) {return PRNG_ERR_OUT_OF_BOUNDS;}
+#endif /* macintosh */
+/* To make sure that the generator state is valid */
+#define GENCHECK(p) if(p->outstate.index>20) {return PRNG_ERR_OUT_OF_BOUNDS;} /* index is unsigned */
+/* To make sure that the entropy pool is valid */
+#define POOLCHECK(p) /* */
+
+
+#endif