AESDecrypt Class Reference

AES decryption class. More...

#include <crypto_asdcp.h>

Inheritance diagram for AESDecrypt:


Public Member Functions
virtual bool	SetKey (size_t KeySize, const UInt8 *Key)
	Set an encryption key.
bool	SetIV (size_t IVSize, const UInt8 *IV, bool Force=false)
	Set a decryption Initialization Vector.
DataChunkPtr	GetIV (void)
	Get the Initialization Vector that will be used for the next decryption.
bool	CanDecryptInPlace (size_t BlockSize=0)
	Can this decryption system safely decrypt in place?
bool	DecryptInPlace (size_t Size, UInt8 *Data)
	Decrypt data bytes in place.
DataChunkPtr	Decrypt (size_t Size, const UInt8 *Data)
	Decrypt data and return in a new buffer.
Protected Attributes
AES_KEY	CurrentKey
UInt8	CurrentIV [16]

Detailed Description

AES decryption class.

Member Function Documentation

virtual bool SetKey	(	size_t	KeySize,
		const UInt8 *	Key
	)			`[inline, virtual]`

Set an encryption key.

Returns:: True if key is accepted

Implements Decrypt_Base.

bool SetIV	(	size_t	IVSize,
		const UInt8 *	IV,
		bool	Force = `false`
	)			`[inline, virtual]`

Set a decryption Initialization Vector.

Returns:: False if Initialization Vector is rejected

Note:: Some crypto schemes, such as cypher block chaining, only require the initialization vector to be set at the start - in these cases Force will be set to true when the vector needs to be initialized, and false for any other calls. This allows different schemes to be used with minimal changes in the calling code.

Implements Decrypt_Base.

DataChunkPtr GetIV ( void ) [inline, virtual]

Get the Initialization Vector that will be used for the next decryption.

If called immediately after SetIV() with Force=true or SetIV() for a crypto scheme that accepts each offered vector (rather than creating its own ones) the result will be the vector offered in that SetIV() call.

Implements Decrypt_Base.

bool CanDecryptInPlace ( size_t BlockSize = 0 ) [inline, virtual]

Can this decryption system safely decrypt in place?

If BlockSize is 0 this function will return true if decryption of all block sizes can be "in place". Otherwise the result will indicate whether the given blocksize can be decrypted "in place".

Implements Decrypt_Base.