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PL286/external/ImageMagick/MagickCore/random.c

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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% RRRR AAA N N DDDD OOO M M %
% R R A A NN N D D O O MM MM %
% RRRR AAAAA N N N D D O O M M M %
% R R A A N NN D D O O M M %
% R R A A N N DDDD OOO M M %
% %
% %
% MagickCore Methods to Generate Random Numbers %
% %
% Software Design %
% Cristy %
% December 2001 %
% %
% %
% Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% http://www.imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% The generation of random numbers is too important to be left to chance.
% -- Tom Christiansen <tchrist@mox.perl.com>
%
%
*/
/*
Include declarations.
*/
#if defined(__VMS)
#include <time.h>
#endif
#if defined(__MINGW32__) || defined(__MINGW64__)
#include <sys/time.h>
#endif
#include "MagickCore/studio.h"
#include "MagickCore/exception.h"
#include "MagickCore/exception-private.h"
#include "MagickCore/image-private.h"
#include "MagickCore/memory_.h"
#include "MagickCore/semaphore.h"
#include "MagickCore/random_.h"
#include "MagickCore/random-private.h"
#include "MagickCore/resource_.h"
#include "MagickCore/signature-private.h"
#include "MagickCore/string_.h"
#include "MagickCore/thread_.h"
#include "MagickCore/thread-private.h"
#include "MagickCore/utility.h"
#include "MagickCore/utility-private.h"
/*
Define declarations.
*/
#define PseudoRandomHash SHA256Hash
#define RandomEntropyLevel 9
#define RandomFilename "reservoir.xdm"
#define RandomFiletype "random"
#define RandomProtocolMajorVersion 1
#define RandomProtocolMinorVersion 0
/*
Typedef declarations.
*/
struct _RandomInfo
{
SignatureInfo
*signature_info;
StringInfo
*nonce,
*reservoir;
size_t
i;
unsigned long
seed[4];
double
normalize;
unsigned long
secret_key;
unsigned short
protocol_major,
protocol_minor;
SemaphoreInfo
*semaphore;
ssize_t
timestamp;
size_t
signature;
};
/*
External declarations.
*/
#if defined(__APPLE__) && !defined(TARGET_OS_IPHONE)
#include <crt_externs.h>
#define environ (*_NSGetEnviron())
#endif
#if !defined(MAGICKCORE_WINDOWS_SUPPORT)
extern char
**environ;
#endif
/*
Global declarations.
*/
static SemaphoreInfo
*random_semaphore = (SemaphoreInfo *) NULL;
static unsigned long
secret_key = ~0UL;
static MagickBooleanType
gather_true_random = MagickFalse;
/*
Forward declarations.
*/
static StringInfo
*GenerateEntropicChaos(RandomInfo *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% A c q u i r e R a n d o m I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AcquireRandomInfo() allocates the RandomInfo structure.
%
% The format of the AcquireRandomInfo method is:
%
% RandomInfo *AcquireRandomInfo(void)
%
*/
MagickExport RandomInfo *AcquireRandomInfo(void)
{
const StringInfo
*digest;
RandomInfo
*random_info;
StringInfo
*entropy,
*key,
*nonce;
random_info=(RandomInfo *) AcquireMagickMemory(sizeof(*random_info));
if (random_info == (RandomInfo *) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
(void) ResetMagickMemory(random_info,0,sizeof(*random_info));
random_info->signature_info=AcquireSignatureInfo();
random_info->nonce=AcquireStringInfo(2*GetSignatureDigestsize(
random_info->signature_info));
ResetStringInfo(random_info->nonce);
random_info->reservoir=AcquireStringInfo(GetSignatureDigestsize(
random_info->signature_info));
ResetStringInfo(random_info->reservoir);
random_info->normalize=1.0/(~0UL);
random_info->secret_key=secret_key;
random_info->protocol_major=RandomProtocolMajorVersion;
random_info->protocol_minor=RandomProtocolMinorVersion;
random_info->semaphore=AcquireSemaphoreInfo();
random_info->timestamp=(ssize_t) time(0);
random_info->signature=MagickCoreSignature;
/*
Seed random nonce.
*/
nonce=GenerateEntropicChaos(random_info);
if (nonce == (StringInfo *) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
InitializeSignature(random_info->signature_info);
UpdateSignature(random_info->signature_info,nonce);
FinalizeSignature(random_info->signature_info);
SetStringInfoLength(nonce,(GetSignatureDigestsize(
random_info->signature_info)+1)/2);
SetStringInfo(nonce,GetSignatureDigest(random_info->signature_info));
SetStringInfo(random_info->nonce,nonce);
nonce=DestroyStringInfo(nonce);
/*
Seed random reservoir with entropic data.
*/
entropy=GenerateEntropicChaos(random_info);
if (entropy == (StringInfo *) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
UpdateSignature(random_info->signature_info,entropy);
FinalizeSignature(random_info->signature_info);
SetStringInfo(random_info->reservoir,GetSignatureDigest(
random_info->signature_info));
entropy=DestroyStringInfo(entropy);
/*
Seed pseudo random number generator.
*/
if (random_info->secret_key == ~0UL)
{
key=GetRandomKey(random_info,sizeof(random_info->secret_key));
(void) CopyMagickMemory(random_info->seed,GetStringInfoDatum(key),
GetStringInfoLength(key));
key=DestroyStringInfo(key);
}
else
{
SignatureInfo
*signature_info;
signature_info=AcquireSignatureInfo();
key=AcquireStringInfo(sizeof(random_info->secret_key));
SetStringInfoDatum(key,(unsigned char *) &random_info->secret_key);
UpdateSignature(signature_info,key);
key=DestroyStringInfo(key);
FinalizeSignature(signature_info);
digest=GetSignatureDigest(signature_info);
(void) CopyMagickMemory(random_info->seed,GetStringInfoDatum(digest),
MagickMin(GetSignatureDigestsize(signature_info),
sizeof(*random_info->seed)));
signature_info=DestroySignatureInfo(signature_info);
}
random_info->seed[1]=0x50a7f451UL;
random_info->seed[2]=0x5365417eUL;
random_info->seed[3]=0xc3a4171aUL;
return(random_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D e s t r o y R a n d o m I n f o %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DestroyRandomInfo() deallocates memory associated with the random
% reservoir.
%
% The format of the DestroyRandomInfo method is:
%
% RandomInfo *DestroyRandomInfo(RandomInfo *random_info)
%
% A description of each parameter follows:
%
% o random_info: the random info.
%
*/
MagickExport RandomInfo *DestroyRandomInfo(RandomInfo *random_info)
{
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
assert(random_info != (RandomInfo *) NULL);
assert(random_info->signature == MagickCoreSignature);
LockSemaphoreInfo(random_info->semaphore);
if (random_info->reservoir != (StringInfo *) NULL)
random_info->reservoir=DestroyStringInfo(random_info->reservoir);
if (random_info->nonce != (StringInfo *) NULL)
random_info->nonce=DestroyStringInfo(random_info->nonce);
if (random_info->signature_info != (SignatureInfo *) NULL)
random_info->signature_info=DestroySignatureInfo(
random_info->signature_info);
(void) ResetMagickMemory(random_info->seed,0,sizeof(*random_info->seed));
random_info->signature=(~MagickCoreSignature);
UnlockSemaphoreInfo(random_info->semaphore);
RelinquishSemaphoreInfo(&random_info->semaphore);
random_info=(RandomInfo *) RelinquishMagickMemory(random_info);
return(random_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e n e r a t e E n t r o p i c C h a o s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GenerateEntropicChaos() generate entropic chaos used to initialize the
% random reservoir.
%
% The format of the GenerateEntropicChaos method is:
%
% StringInfo *GenerateEntropicChaos(RandomInfo *random_info)
%
% A description of each parameter follows:
%
% o random_info: the random info.
%
*/
#if !defined(MAGICKCORE_WINDOWS_SUPPORT)
static ssize_t ReadRandom(int file,unsigned char *source,size_t length)
{
register unsigned char
*q;
ssize_t
offset,
count;
offset=0;
for (q=source; length != 0; length-=count)
{
count=(ssize_t) read(file,q,length);
if (count <= 0)
{
count=0;
if (errno == EINTR)
continue;
return(-1);
}
q+=count;
offset+=count;
}
return(offset);
}
#endif
static StringInfo *GenerateEntropicChaos(RandomInfo *random_info)
{
#define MaxEntropyExtent 64
MagickThreadType
tid;
StringInfo
*chaos,
*entropy;
size_t
nanoseconds,
seconds;
ssize_t
pid;
/*
Initialize random reservoir.
*/
entropy=AcquireStringInfo(0);
LockSemaphoreInfo(random_info->semaphore);
chaos=AcquireStringInfo(sizeof(unsigned char *));
SetStringInfoDatum(chaos,(unsigned char *) &entropy);
ConcatenateStringInfo(entropy,chaos);
SetStringInfoDatum(chaos,(unsigned char *) entropy);
ConcatenateStringInfo(entropy,chaos);
pid=(ssize_t) getpid();
SetStringInfoLength(chaos,sizeof(pid));
SetStringInfoDatum(chaos,(unsigned char *) &pid);
ConcatenateStringInfo(entropy,chaos);
tid=GetMagickThreadId();
SetStringInfoLength(chaos,sizeof(tid));
SetStringInfoDatum(chaos,(unsigned char *) &tid);
ConcatenateStringInfo(entropy,chaos);
#if defined(MAGICKCORE_HAVE_SYSCONF) && defined(_SC_PHYS_PAGES)
{
ssize_t
pages;
pages=(ssize_t) sysconf(_SC_PHYS_PAGES);
SetStringInfoLength(chaos,sizeof(pages));
SetStringInfoDatum(chaos,(unsigned char *) &pages);
ConcatenateStringInfo(entropy,chaos);
}
#endif
#if defined(MAGICKCORE_HAVE_GETRUSAGE) && defined(RUSAGE_SELF)
{
struct rusage
usage;
if (getrusage(RUSAGE_SELF,&usage) == 0)
{
SetStringInfoLength(chaos,sizeof(usage));
SetStringInfoDatum(chaos,(unsigned char *) &usage);
}
}
#endif
seconds=time((time_t *) 0);
nanoseconds=0;
#if defined(MAGICKCORE_HAVE_GETTIMEOFDAY)
{
struct timeval
timer;
if (gettimeofday(&timer,(struct timezone *) NULL) == 0)
{
seconds=timer.tv_sec;
nanoseconds=1000UL*timer.tv_usec;
}
}
#endif
#if defined(MAGICKCORE_HAVE_CLOCK_GETTIME) && defined(CLOCK_REALTIME_HR)
{
struct timespec
timer;
if (clock_gettime(CLOCK_REALTIME_HR,&timer) == 0)
{
seconds=timer.tv_sec;
nanoseconds=timer.tv_nsec;
}
}
#endif
SetStringInfoLength(chaos,sizeof(seconds));
SetStringInfoDatum(chaos,(unsigned char *) &seconds);
ConcatenateStringInfo(entropy,chaos);
SetStringInfoLength(chaos,sizeof(nanoseconds));
SetStringInfoDatum(chaos,(unsigned char *) &nanoseconds);
ConcatenateStringInfo(entropy,chaos);
nanoseconds=0;
#if defined(MAGICKCORE_HAVE_CLOCK)
nanoseconds=clock();
#endif
#if defined(MAGICKCORE_HAVE_TIMES)
{
struct tms
timer;
(void) times(&timer);
nanoseconds=timer.tms_utime+timer.tms_stime;
}
#endif
SetStringInfoLength(chaos,sizeof(nanoseconds));
SetStringInfoDatum(chaos,(unsigned char *) &nanoseconds);
ConcatenateStringInfo(entropy,chaos);
#if defined(MAGICKCORE_HAVE_MKSTEMP)
{
char
path[MagickPathExtent];
int
file;
(void) GetPathTemplate(path);
file=mkstemp(path);
if (file != -1)
{
#if defined(MAGICKCORE_HAVE_FCHMOD)
(void) fchmod(file,0600);
#endif
#if defined(__OS2__)
setmode(file,O_BINARY);
#endif
(void) close(file);
}
(void) remove_utf8(path);
SetStringInfoLength(chaos,strlen(path));
SetStringInfoDatum(chaos,(unsigned char *) path);
ConcatenateStringInfo(entropy,chaos);
}
#endif
#if defined(MAGICKCORE_WINDOWS_SUPPORT)
{
double
seconds;
LARGE_INTEGER
nanoseconds;
MagickBooleanType
status;
/*
Not crytographically strong but better than nothing.
*/
seconds=NTElapsedTime()+NTUserTime();
SetStringInfoLength(chaos,sizeof(seconds));
SetStringInfoDatum(chaos,(unsigned char *) &seconds);
ConcatenateStringInfo(entropy,chaos);
if (QueryPerformanceCounter(&nanoseconds) != 0)
{
SetStringInfoLength(chaos,sizeof(nanoseconds));
SetStringInfoDatum(chaos,(unsigned char *) &nanoseconds);
ConcatenateStringInfo(entropy,chaos);
}
/*
Our best hope for true entropy.
*/
SetStringInfoLength(chaos,MaxEntropyExtent);
status=NTGatherRandomData(MaxEntropyExtent,GetStringInfoDatum(chaos));
(void) status;
ConcatenateStringInfo(entropy,chaos);
}
#else
{
char
*filename;
int
file;
ssize_t
count;
StringInfo
*device;
/*
Not crytographically strong but better than nothing.
*/
if (environ != (char **) NULL)
{
register ssize_t
i;
/*
Squeeze some entropy from the sometimes unpredicatble environment.
*/
for (i=0; environ[i] != (char *) NULL; i++)
{
SetStringInfoLength(chaos,strlen(environ[i]));
SetStringInfoDatum(chaos,(unsigned char *) environ[i]);
ConcatenateStringInfo(entropy,chaos);
}
}
filename=AcquireString("/dev/urandom");
device=StringToStringInfo(filename);
device=DestroyStringInfo(device);
file=open_utf8(filename,O_RDONLY | O_BINARY,0);
filename=DestroyString(filename);
if (file != -1)
{
SetStringInfoLength(chaos,MaxEntropyExtent);
count=ReadRandom(file,GetStringInfoDatum(chaos),MaxEntropyExtent);
(void) close(file);
SetStringInfoLength(chaos,(size_t) count);
ConcatenateStringInfo(entropy,chaos);
}
if (gather_true_random != MagickFalse)
{
/*
Our best hope for true entropy.
*/
filename=AcquireString("/dev/random");
device=StringToStringInfo(filename);
device=DestroyStringInfo(device);
file=open_utf8(filename,O_RDONLY | O_BINARY,0);
filename=DestroyString(filename);
if (file == -1)
{
filename=AcquireString("/dev/srandom");
device=StringToStringInfo(filename);
device=DestroyStringInfo(device);
file=open_utf8(filename,O_RDONLY | O_BINARY,0);
}
if (file != -1)
{
SetStringInfoLength(chaos,MaxEntropyExtent);
count=ReadRandom(file,GetStringInfoDatum(chaos),MaxEntropyExtent);
(void) close(file);
SetStringInfoLength(chaos,(size_t) count);
ConcatenateStringInfo(entropy,chaos);
}
}
}
#endif
chaos=DestroyStringInfo(chaos);
UnlockSemaphoreInfo(random_info->semaphore);
return(entropy);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t P s e u d o R a n d o m V a l u e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetPseudoRandomValue() return a non-negative double-precision floating-point
% value uniformly distributed over the interval [0.0, 1.0) with a 2 to the
% 128th-1 period.
%
% The format of the GetPseudoRandomValue method is:
%
% double GetPseudoRandomValue(RandomInfo *randon_info)
%
% A description of each parameter follows:
%
% o random_info: the random info.
%
*/
MagickExport double GetPseudoRandomValue(RandomInfo *random_info)
{
register unsigned long
*seed;
unsigned long
alpha;
seed=random_info->seed;
do
{
alpha=(unsigned long) (seed[1] ^ (seed[1] << 11));
seed[1]=seed[2];
seed[2]=seed[3];
seed[3]=seed[0];
seed[0]=(seed[0] ^ (seed[0] >> 19)) ^ (alpha ^ (alpha >> 8));
} while (seed[0] == ~0UL);
return(random_info->normalize*seed[0]);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e t R a n d o m I n f o N o r m a l i z e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetRandomInfoNormalize() returns the random normalize value.
%
% The format of the GetRandomInfoNormalize method is:
%
% double GetRandomInfoNormalize(const RandomInfo *random_info)
%
% A description of each parameter follows:
%
% o random_info: the random info.
%
*/
MagickPrivate double GetRandomInfoNormalize(const RandomInfo *random_info)
{
assert(random_info != (const RandomInfo *) NULL);
return(random_info->normalize);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e t R a n d o m I n f o S e e d %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetRandomInfoSeed() returns the random seed.
%
% The format of the GetRandomInfoSeed method is:
%
% unsigned long *GetRandomInfoSeed(RandomInfo *random_info)
%
% A description of each parameter follows:
%
% o random_info: the random info.
%
*/
MagickPrivate unsigned long *GetRandomInfoSeed(RandomInfo *random_info)
{
assert(random_info != (RandomInfo *) NULL);
return(random_info->seed);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t R a n d o m K e y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetRandomKey() gets a random key from the reservoir.
%
% The format of the GetRandomKey method is:
%
% StringInfo *GetRandomKey(RandomInfo *random_info,const size_t length)
%
% A description of each parameter follows:
%
% o random_info: the random info.
%
% o length: the key length.
%
*/
MagickExport StringInfo *GetRandomKey(RandomInfo *random_info,
const size_t length)
{
StringInfo
*key;
assert(random_info != (RandomInfo *) NULL);
key=AcquireStringInfo(length);
SetRandomKey(random_info,length,GetStringInfoDatum(key));
return(key);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t R a n d o m S e c r e t K e y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetRandomSecretKey() returns the random secet key.
%
% The format of the GetRandomSecretKey method is:
%
% unsigned long GetRandomSecretKey(const RandomInfo *random_info)
%
% A description of each parameter follows:
%
% o random_info: the random info.
*/
MagickExport unsigned long GetRandomSecretKey(const RandomInfo *random_info)
{
return(random_info->secret_key);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t R a n d o m V a l u e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetRandomValue() return a non-negative double-precision floating-point
% value uniformly distributed over the interval [0.0, 1.0) with a 2 to the
% 128th-1 period (not cryptographically strong).
%
% The format of the GetRandomValue method is:
%
% double GetRandomValue(void)
%
*/
MagickExport double GetRandomValue(RandomInfo *random_info)
{
unsigned long
key,
range;
range=(~0UL);
do
{
SetRandomKey(random_info,sizeof(key),(unsigned char *) &key);
} while (key == range);
return((double) key/range);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ R a n d o m C o m p o n e n t G e n e s i s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RandomComponentGenesis() instantiates the random component.
%
% The format of the RandomComponentGenesis method is:
%
% MagickBooleanType RandomComponentGenesis(void)
%
*/
MagickPrivate MagickBooleanType RandomComponentGenesis(void)
{
if (random_semaphore == (SemaphoreInfo *) NULL)
random_semaphore=AcquireSemaphoreInfo();
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ R a n d o m C o m p o n e n t T e r m i n u s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RandomComponentTerminus() destroys the random component.
%
% The format of the RandomComponentTerminus method is:
%
% RandomComponentTerminus(void)
%
*/
MagickPrivate void RandomComponentTerminus(void)
{
if (random_semaphore == (SemaphoreInfo *) NULL)
ActivateSemaphoreInfo(&random_semaphore);
RelinquishSemaphoreInfo(&random_semaphore);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% S e t R a n d o m K e y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% SetRandomKey() sets a random key from the reservoir.
%
% The format of the SetRandomKey method is:
%
% void SetRandomKey(RandomInfo *random_info,const size_t length,
% unsigned char *key)
%
% A description of each parameter follows:
%
% o random_info: the random info.
%
% o length: the key length.
%
% o key: the key.
%
*/
static inline void IncrementRandomNonce(StringInfo *nonce)
{
register ssize_t
i;
unsigned char
*datum;
datum=GetStringInfoDatum(nonce);
for (i=(ssize_t) (GetStringInfoLength(nonce)-1); i != 0; i--)
{
datum[i]++;
if (datum[i] != 0)
return;
}
ThrowFatalException(RandomFatalError,"SequenceWrapError");
}
MagickExport void SetRandomKey(RandomInfo *random_info,const size_t length,
unsigned char *key)
{
register size_t
i;
register unsigned char
*p;
SignatureInfo
*signature_info;
unsigned char
*datum;
assert(random_info != (RandomInfo *) NULL);
if (length == 0)
return;
LockSemaphoreInfo(random_info->semaphore);
signature_info=random_info->signature_info;
datum=GetStringInfoDatum(random_info->reservoir);
i=length;
for (p=key; (i != 0) && (random_info->i != 0); i--)
{
*p++=datum[random_info->i];
random_info->i++;
if (random_info->i == GetSignatureDigestsize(signature_info))
random_info->i=0;
}
while (i >= GetSignatureDigestsize(signature_info))
{
InitializeSignature(signature_info);
UpdateSignature(signature_info,random_info->nonce);
FinalizeSignature(signature_info);
IncrementRandomNonce(random_info->nonce);
(void) CopyMagickMemory(p,GetStringInfoDatum(GetSignatureDigest(
signature_info)),GetSignatureDigestsize(signature_info));
p+=GetSignatureDigestsize(signature_info);
i-=GetSignatureDigestsize(signature_info);
}
if (i != 0)
{
InitializeSignature(signature_info);
UpdateSignature(signature_info,random_info->nonce);
FinalizeSignature(signature_info);
IncrementRandomNonce(random_info->nonce);
SetStringInfo(random_info->reservoir,GetSignatureDigest(signature_info));
random_info->i=i;
datum=GetStringInfoDatum(random_info->reservoir);
while (i-- != 0)
p[i]=datum[i];
}
UnlockSemaphoreInfo(random_info->semaphore);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% S e t R a n d o m S e c r e t K e y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% SetRandomSecretKey() sets the pseudo-random number generator secret key.
%
% The format of the SetRandomSecretKey method is:
%
% void SetRandomSecretKey(const unsigned long key)
%
% A description of each parameter follows:
%
% o key: the secret seed.
%
*/
MagickExport void SetRandomSecretKey(const unsigned long key)
{
secret_key=key;
}
/*
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% %
% %
% %
% S e t R a n d o m T r u e R a n d o m %
% %
% %
% %
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%
% SetRandomTrueRandom() declares your intentions to use true random numbers.
% True random numbers are encouraged but may not always be practical because
% your application may block while entropy is gathered from your environment.
%
% The format of the SetRandomTrueRandom method is:
%
% void SetRandomTrueRandom(const MagickBooleanType true_random)
%
% A description of each parameter follows:
%
% o true_random: declare your intentions to use true-random number.
%
*/
MagickExport void SetRandomTrueRandom(const MagickBooleanType true_random)
{
gather_true_random=true_random;
}