Implementation of the Cipher Feedback (CFB) mode for 128-bit block ciphers. More...
#include <CFB.h>
Inheritance diagram for CFB< T >:
Public Member Functions | |
| CFB () | |
| Constructs a new CFB object for the block cipher T. | |
 Public Member Functions inherited from CFBCommon | |
| virtual | ~CFBCommon () |
| Destroys this cipher object after clearing sensitive information. | |
| size_t | keySize () const |
| Default size of the key for this cipher, in bytes. More... | |
| size_t | ivSize () const |
| Size of the initialization vector for this cipher, in bytes. More... | |
| bool | setKey (const uint8_t *key, size_t len) |
| Sets the key to use for future encryption and decryption operations. More... | |
| bool | setIV (const uint8_t *iv, size_t len) |
| Sets the initialization vector to use for future encryption and decryption operations. More... | |
| void | encrypt (uint8_t *output, const uint8_t *input, size_t len) |
| Encrypts an input buffer and writes the ciphertext to an output buffer. More... | |
| void | decrypt (uint8_t *output, const uint8_t *input, size_t len) |
| Decrypts an input buffer and writes the plaintext to an output buffer. More... | |
| void | clear () |
| Clears all security-sensitive state from this cipher. More... | |
| Public Member Functions inherited from Cipher | |
| Cipher () | |
| Constructs a new cipher object. | |
| virtual | ~Cipher () |
| Destroys this cipher object. More... | |
Additional Inherited Members | |
| Protected Member Functions inherited from CFBCommon | |
| CFBCommon () | |
| Constructs a new cipher in CFB mode. More... | |
| void | setBlockCipher (BlockCipher *cipher) |
| Sets the block cipher to use for this CFB object. More... | |
Detailed Description
template<typename T>
class CFB< T >
Implementation of the Cipher Feedback (CFB) mode for 128-bit block ciphers.
The template parameter T must be a concrete subclass of BlockCipher indicating the specific block cipher to use. T must have a block size of 16 bytes (128 bits). The size of the CFB shift register is the same as the block size.
For example, the following creates a CFB object using AES192 as the underlying cipher:
CFB<AES192> cfb;
cfb.setKey(key, 24);
cfb.setIV(iv, 16);
cfb.encrypt(output, input, len);
bool setKey(const uint8_t *key, size_t len)
Sets the key to use for future encryption and decryption operations.
Definition: CFB.cpp:66
void encrypt(uint8_t *output, const uint8_t *input, size_t len)
Encrypts an input buffer and writes the ciphertext to an output buffer.
Definition: CFB.cpp:85
bool setIV(const uint8_t *iv, size_t len)
Sets the initialization vector to use for future encryption and decryption operations.
Definition: CFB.cpp:76
Decryption is similar:
CFB<AES192> cfb;
cfb.setKey(key, 24);
cfb.setIV(iv, 16);
cfb.decrypt(output, input, len);
void decrypt(uint8_t *output, const uint8_t *input, size_t len)
Decrypts an input buffer and writes the plaintext to an output buffer.
Definition: CFB.cpp:112
The size of the ciphertext will always be the same as the size of the plaintext.
Reference: http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation
The documentation for this class was generated from the following files:
