Abstract base class for AES block ciphers. More...

#include <AES.h>

Inheritance diagram for AESCommon:

Public Member Functions
virtual	~AESCommon ()
	Destroys this AES block cipher object after clearing sensitive information.

size_t	blockSize () const
	Size of an AES block in bytes. More...

void	encryptBlock (uint8_t output, const uint8_t input)
	Encrypts a single block using this cipher. More...

void	decryptBlock (uint8_t output, const uint8_t input)
	Decrypts a single block using this cipher. More...

void	clear ()
	Clears all security-sensitive state from this block cipher. More...

Public Member Functions inherited from BlockCipher
	BlockCipher ()
	Constructs a block cipher.

virtual	~BlockCipher ()
	Destroys this block cipher object. More...

virtual size_t	keySize () const =0
	Default size of the key for this block cipher, in bytes. More...

virtual bool	setKey (const uint8_t *key, size_t len)=0
	Sets the key to use for future encryption and decryption operations. More...

Protected Member Functions
	AESCommon ()
	Constructs an AES block cipher object.

Friends
class	AESTiny128

class	AESTiny256

class	AESSmall128

class	AESSmall256

Detailed Description

Abstract base class for AES block ciphers.

This class is abstract. The caller should instantiate AES128, AES192, or AES256 to create an AES block cipher with a specific key size.

Note: This AES implementation does not have constant cache behaviour due to the use of table lookups. It may not be safe to use this implementation in an environment where the attacker can observe the timing of encryption and decryption operations. Unless AES compatibility is required, it is recommended that the ChaCha stream cipher be used instead.

Reference: http://en.wikipedia.org/wiki/Advanced_Encryption_Standard

See also: ChaCha, AES128, AES192, AES256

Definition at line 42 of file AES.h.

Member Function Documentation

◆ blockSize()

size_t AESCommon::blockSize ( ) const

virtual

Size of an AES block in bytes.

Returns: Always returns 16.

Implements BlockCipher.

Definition at line 144 of file AESCommon.cpp.

◆ clear()

void AESCommon::clear ( )

virtual

Clears all security-sensitive state from this block cipher.

Security-sensitive information includes key schedules and any temporary state that is used by encryptBlock() or decryptBlock() which is stored in the object itself.

See also: setKey(), encryptBlock(), decryptBlock()

Implements BlockCipher.

Definition at line 332 of file AESCommon.cpp.

◆ decryptBlock()

void AESCommon::decryptBlock	(	uint8_t *	output,
		const uint8_t *	input
	)

virtual

Decrypts a single block using this cipher.

Parameters

output	The output buffer to put the plaintext into. Must be at least blockSize() bytes in length.
input	The input buffer to read the ciphertext from which is allowed to overlap with output. Must be at least blockSize() bytes in length.

See also: encryptBlock(), blockSize()

Implements BlockCipher.

Definition at line 301 of file AESCommon.cpp.

◆ encryptBlock()

void AESCommon::encryptBlock	(	uint8_t *	output,
		const uint8_t *	input
	)

virtual

Encrypts a single block using this cipher.

Parameters

output	The output buffer to put the ciphertext into. Must be at least blockSize() bytes in length.
input	The input buffer to read the plaintext from which is allowed to overlap with output. Must be at least blockSize() bytes in length.

See also: decryptBlock(), blockSize()

Implements BlockCipher.

Definition at line 270 of file AESCommon.cpp.

The documentation for this class was generated from the following files:

Public Member Functions

Protected Member Functions

Friends

Detailed Description

Member Function Documentation

◆ blockSize()

◆ clear()

◆ decryptBlock()

◆ encryptBlock()