signature.c File Reference

#include "MagickCore/studio.h"
#include "MagickCore/cache.h"
#include "MagickCore/exception.h"
#include "MagickCore/exception-private.h"
#include "MagickCore/property.h"
#include "MagickCore/image.h"
#include "MagickCore/memory_.h"
#include "MagickCore/memory-private.h"
#include "MagickCore/pixel-accessor.h"
#include "MagickCore/quantum.h"
#include "MagickCore/quantum-private.h"
#include "MagickCore/signature.h"
#include "MagickCore/signature-private.h"
#include "MagickCore/string_.h"
#include "MagickCore/timer-private.h"

Include dependency graph for signature.c:

Go to the source code of this file.

Data Structures
struct	_SignatureInfo

Macros
#define	SignatureBlocksize   64
#define	SignatureDigestsize   32
#define	Ch(x, y, z)   (((x) & (y)) ^ (~(x) & (z)))
#define	Maj(x, y, z)   (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define	RotateRight(x, n)   (Trunc32(((x) >> n) | ((x) << (32-n))))
#define	Sigma0(x)   (RotateRight(x,7) ^ RotateRight(x,18) ^ Trunc32((x) >> 3))
#define	Sigma1(x)   (RotateRight(x,17) ^ RotateRight(x,19) ^ Trunc32((x) >> 10))
#define	Suma0(x)   (RotateRight(x,2) ^ RotateRight(x,13) ^ RotateRight(x,22))
#define	Suma1(x)   (RotateRight(x,6) ^ RotateRight(x,11) ^ RotateRight(x,25))
#define	Trunc32(x)   ((unsigned int) ((x) & 0xffffffffU))

Functions
static void	TransformSignature (SignatureInfo *)
MagickPrivate SignatureInfo *	AcquireSignatureInfo (void)
MagickPrivate SignatureInfo *	DestroySignatureInfo (SignatureInfo *signature_info)
MagickPrivate void	FinalizeSignature (SignatureInfo *signature_info)
MagickPrivate unsigned int	GetSignatureBlocksize (const SignatureInfo *signature_info)
MagickPrivate const StringInfo *	GetSignatureDigest (const SignatureInfo *signature_info)
MagickPrivate unsigned int	GetSignatureDigestsize (const SignatureInfo *signature_info)
MagickPrivate void	InitializeSignature (SignatureInfo *signature_info)
MagickPrivate void	SetSignatureDigest (SignatureInfo *signature_info, const StringInfo *digest)
MagickExport MagickBooleanType	SignatureImage (Image *image, ExceptionInfo *exception)
MagickPrivate void	UpdateSignature (SignatureInfo *signature_info, const StringInfo *message)

Macro Definition Documentation

Ch

#define Ch	(		x,
			y,
			z
	)		(((x) & (y)) ^ (~(x) & (z)))

Maj

#define Maj	(		x,
			y,
			z
	)		(((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))

RotateRight

#define RotateRight	(		x,
			n
	)		(Trunc32(((x) >> n) | ((x) << (32-n))))

Sigma0

#define Sigma0

(

x

)

(RotateRight(x,7) ^ RotateRight(x,18) ^ Trunc32((x) >> 3))

Sigma1

#define Sigma1

(

x

)

(RotateRight(x,17) ^ RotateRight(x,19) ^ Trunc32((x) >> 10))

SignatureBlocksize

#define SignatureBlocksize   64

Definition at line 60 of file signature.c.

SignatureDigestsize

#define SignatureDigestsize   32

Definition at line 61 of file signature.c.

Suma0

#define Suma0

(

x

)

(RotateRight(x,2) ^ RotateRight(x,13) ^ RotateRight(x,22))

Suma1

#define Suma1

(

x

)

(RotateRight(x,6) ^ RotateRight(x,11) ^ RotateRight(x,25))

Trunc32

#define Trunc32

(

x

)

((unsigned int) ((x) & 0xffffffffU))

Function Documentation

AcquireSignatureInfo()

MagickPrivate SignatureInfo * AcquireSignatureInfo

(

void

)

Definition at line 118 of file signature.c.

References _SignatureInfo::accumulator, AcquireCriticalMemory(), AcquireQuantumMemory(), AcquireStringInfo(), _SignatureInfo::blocksize, _SignatureInfo::digest, _SignatureInfo::digestsize, GetMagickTime(), InitializeSignature(), _SignatureInfo::lsb_first, MagickCoreSignature, MagickFalse, MagickTrue, _SignatureInfo::message, ResourceLimitFatalError, _SignatureInfo::signature, SignatureBlocksize, SignatureDigestsize, ThrowFatalException, and _SignatureInfo::timestamp.

Referenced by SignatureImage().

DestroySignatureInfo()

MagickPrivate SignatureInfo * DestroySignatureInfo

(

SignatureInfo *

signature_info

)

Definition at line 171 of file signature.c.

References _SignatureInfo::accumulator, DestroyStringInfo(), _SignatureInfo::digest, GetMagickModule, IsEventLogging(), LogMagickEvent(), MagickCoreSignature, MagickFalse, _SignatureInfo::message, RelinquishMagickMemory(), _SignatureInfo::signature, and TraceEvent.

Referenced by AcquireRandomInfo(), DestroyRandomInfo(), SignatureImage(), and StringInfoToDigest().

FinalizeSignature()

MagickPrivate void FinalizeSignature

(

SignatureInfo *

signature_info

)

Definition at line 211 of file signature.c.

References _SignatureInfo::accumulator, _SignatureInfo::digest, GetMagickModule, GetStringInfoDatum(), GetStringInfoLength(), _SignatureInfo::high_order, IsEventLogging(), LogMagickEvent(), _SignatureInfo::low_order, MagickCoreSignature, MagickFalse, _SignatureInfo::message, _SignatureInfo::signature, SignatureDigestsize, TraceEvent, and TransformSignature().

Referenced by SignatureImage().

GetSignatureBlocksize()

MagickPrivate unsigned int GetSignatureBlocksize

(

const SignatureInfo *

signature_info

)

Definition at line 298 of file signature.c.

References _SignatureInfo::blocksize, GetMagickModule, IsEventLogging(), LogMagickEvent(), MagickCoreSignature, MagickFalse, _SignatureInfo::signature, and TraceEvent.

GetSignatureDigest()

MagickPrivate const StringInfo * GetSignatureDigest

(

const SignatureInfo *

signature_info

)

Definition at line 330 of file signature.c.

References _SignatureInfo::digest, GetMagickModule, IsEventLogging(), LogMagickEvent(), MagickCoreSignature, MagickFalse, _SignatureInfo::signature, and TraceEvent.

Referenced by AcquireRandomInfo(), SetRandomKey(), SignatureImage(), and StringInfoToDigest().

GetSignatureDigestsize()

MagickPrivate unsigned int GetSignatureDigestsize

(

const SignatureInfo *

signature_info

)

Definition at line 362 of file signature.c.

References _SignatureInfo::digestsize, GetMagickModule, IsEventLogging(), LogMagickEvent(), MagickCoreSignature, MagickFalse, _SignatureInfo::signature, and TraceEvent.

Referenced by AcquireRandomInfo(), and SetRandomKey().

InitializeSignature()

MagickPrivate void InitializeSignature

(

SignatureInfo *

signature_info

)

Definition at line 394 of file signature.c.

References _SignatureInfo::accumulator, _SignatureInfo::extent, GetMagickModule, _SignatureInfo::high_order, IsEventLogging(), LogMagickEvent(), _SignatureInfo::low_order, MagickCoreSignature, MagickFalse, _SignatureInfo::signature, and TraceEvent.

Referenced by AcquireSignatureInfo().

SetSignatureDigest()

MagickPrivate void SetSignatureDigest	(	SignatureInfo *	signature_info,
		const StringInfo *	digest
	)

Definition at line 438 of file signature.c.

References _SignatureInfo::digest, MagickCoreSignature, SetStringInfo(), and _SignatureInfo::signature.

SignatureImage()

MagickExport MagickBooleanType SignatureImage	(	Image *	image,
		ExceptionInfo *	exception
	)

Definition at line 476 of file signature.c.

References AcquireSignatureInfo(), AcquireStringInfo(), AcquireVirtualCacheView(), _Image::columns, DeleteImageProperty(), DestroyCacheView(), DestroySignatureInfo(), DestroyString(), DestroyStringInfo(), _Image::filename, FinalizeSignature(), GetCacheViewVirtualPixels(), GetMagickModule, GetPixelChannelChannel(), GetPixelChannels(), GetPixelChannelTraits(), GetPixelReadMask(), GetSignatureDigest(), GetStringInfoDatum(), IsEventLogging(), LogMagickEvent(), _SignatureInfo::lsb_first, MagickCoreSignature, MagickFalse, MagickTrue, QuantumRange, QuantumScale, _Image::rows, SetImageProperty(), SetStringInfoLength(), _Image::signature, StringInfoToHexString(), TraceEvent, UpdatePixelTrait, and UpdateSignature().

Referenced by GetMagickPropertyLetter(), and IdentifyImage().

TransformSignature()

static void TransformSignature ( SignatureInfo *  signature_info )

static

Definition at line 597 of file signature.c.

References _SignatureInfo::accumulator, Ch, DisableMSCWarning, GetStringInfoDatum(), _SignatureInfo::lsb_first, MagickFalse, Maj, _SignatureInfo::message, ResetMagickMemory(), RestoreMSCWarning, Sigma0, Sigma1, Suma0, Suma1, and Trunc32.

Referenced by FinalizeSignature(), and UpdateSignature().

UpdateSignature()

MagickPrivate void UpdateSignature	(	SignatureInfo *	signature_info,
		const StringInfo *	message
	)

Definition at line 772 of file signature.c.

References _SignatureInfo::extent, GetStringInfoDatum(), GetStringInfoLength(), _SignatureInfo::high_order, _SignatureInfo::low_order, MagickCoreSignature, _SignatureInfo::message, SetStringInfoDatum(), _SignatureInfo::signature, TransformSignature(), and Trunc32.

Referenced by AcquireRandomInfo(), SetRandomKey(), SignatureImage(), and StringInfoToDigest().