FPakSignatureFile | Unreal Engine 5.6 Documentation

Structure which describes the content of the pak .sig files


Name	FPakSignatureFile
Type	struct
Header File	/Engine/Source/Runtime/PakFile/Public/IPlatformFilePak.h
Include Path	#include "IPlatformFilePak.h"

Syntax

struct FPakSignatureFile

Name	Remarks
EVersion

Name	Type	Remarks	Include Path
Magic	const uint32	Magic number that tells us we're dealing with the new format sig files.	IPlatformFilePak.h

Name	Type	Remarks	Include Path
ChunkHashes	TArray< TPakChunkHash >	CRCs of each contiguous 64kb block of the pak file.	IPlatformFilePak.h
DecryptedHash	FSHAHash	SHA1 hash of the chunk CRC data. Only valid after calling DecryptSignatureAndValidate.	IPlatformFilePak.h
EncryptedHash	TArray< uint8 >	RSA encrypted hash.	IPlatformFilePak.h
SignatureData	TArray< uint8 >	The actual array of data that was encrypted in the RSA block. Contains the chunk table hash and also other custom data related to the pak file.	IPlatformFilePak.h
Version	EVersion	Sig file version. Set to Legacy if the sig file is of an old version.	IPlatformFilePak.h

Name	Remarks	Include Path
FSHAHash ComputeCurrentPrincipalHash()	Helper function for computing the SHA1 hash of the current chunk CRC array	IPlatformFilePak.h
bool DecryptSignatureAndValidate ( const FRSAKeyHandle InKey, const FString& InFilename )	Decrypt the chunk CRCs hash and validate that it matches the current one	IPlatformFilePak.h
void Serialize ( FArchive& Ar )	Serialize/deserialize this object to/from an FArchive	IPlatformFilePak.h
void SetChunkHashesAndSign ( const TArray< TPakChunkHash >& InChunkHashes, const TArrayView< uint8 >& InSignatureData, const FRSAKeyHandle InKey )	Initialize and hash the CRC list then use the provided private key to encrypt the hash	IPlatformFilePak.h

Name	Remarks	Include Path	Unreal Specifiers
UE_DEPRECATED ( "5.1", "Use ComputeCurrentPrincipalHash instead" ) const		IPlatformFilePak.h