C# Class Gurux.DLMS.Secure.GXDLMSChipperingStream

Implements GMAC. This class is based to this doc: http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf

Show file Open project: Gurux/Gurux.DLMS.Net Class Usage Examples

Public Methods

Method	Description
FlushFinalBlock ( ) : byte[]	Process encrypting/decrypting.
GXDLMSChipperingStream ( Gurux security, bool encrypt, byte blockCipherKey, byte aad, byte iv, byte tag ) : System	Constructor.
GXDLMSChipperingStream ( bool encrypt, byte kek ) : System	Constructor.
GetTag ( ) : byte[]	Get tag from crypted data.
Write ( byte input ) : void	Write bytes to decrypt/encrypt.

Private Methods

Method	Description
BEToUInt32 ( byte buff, int offset ) : uint	Convert Big Endian byte array to Little Endian UInt 32.
DecryptAes ( byte input ) : byte[]	Decrypt data using AES RFC3394.
DecryptBlock ( uint key ) : void
EncryptAes ( byte data ) : byte[]	Encrypt data using AES RFC3394.
EncryptBlock ( uint key ) : void	Encrypt data block.
GenerateKey ( bool encrypt, byte key ) : ].uint[	Generate AES keys.
GetGHash ( byte b ) : byte[]	The GF(2128) field used is defined by the polynomial x^{128}+x^7+x^2+x+1. The authentication tag is constructed by feeding blocks of data into the GHASH function, and encrypting the result.
GetUInt32 ( uint value, byte data, int offset ) : void	Get bytes from UIn32.
GetUint128 ( byte buff ) : uint[]	Get Uint 128 as array of UInt32.
ImixCol ( uint x ) : uint
Init ( byte H ) : void
MultiplyH ( byte value ) : void
MultiplyP ( uint x ) : void
MultiplyP8 ( uint x ) : void
PackBlock ( byte bytes, int offset ) : void
ProcessBlock ( byte input, int inOffset, byte output, int outOffset ) : int
Reset ( ) : void	Reset
SetPackLength ( ulong length, byte buff, int offset ) : void	Set packet length to byte array.
Shift ( UInt32 value, int shift ) : UInt32	Shift value.
ShiftRight ( uint block, int count ) : void	Shift block to right.
StarX ( uint value ) : uint	Initialise the key schedule from the user supplied key.
SubWord ( uint value ) : UInt32
TagsEquals ( byte tag1, byte tag2 ) : bool	Are tags equals.
ToUInt32 ( byte value, int offset ) : UInt32	Convert byte array to Little Endian.
UInt32_To_BE ( uint value, byte buff, int offset ) : void	Convert uint32 to Big Endian byte array.
UnPackBlock ( byte bytes, int offset ) : void
Xor ( byte block, byte value ) : void	Make Xor for 128 bits.
Xor ( uint block, uint value ) : void	Make Xor for 128 bits.
gCTRBlock ( byte buf, int bufCount ) : void

Method Details

FlushFinalBlock() public method

Process encrypting/decrypting.

public FlushFinalBlock ( ) : byte[]
return	byte[]

GXDLMSChipperingStream() public method

Constructor.

public GXDLMSChipperingStream ( Gurux security, bool encrypt, byte blockCipherKey, byte aad, byte iv, byte tag ) : System
security	Gurux	Used security level.
encrypt	bool
blockCipherKey	byte
aad	byte
iv	byte
tag	byte
return	System

GXDLMSChipperingStream() public method

Constructor.

public GXDLMSChipperingStream ( bool encrypt, byte kek ) : System
encrypt	bool
kek	byte	Key Encrypting Key, also known as Master key.
return	System

GetTag() public method

Get tag from crypted data.

public GetTag ( ) : byte[]
return	byte[]

Write() public method

Write bytes to decrypt/encrypt.

public Write ( byte input ) : void
input	byte
return	void