CustomCipher Class Reference

Block cipher Feistel 16 round dengan fungsi F berbasis sigma-delta. More...

#include <cipher.hpp>

Inheritance diagram for CustomCipher:

Public Member Functions
	CustomCipher (const uint8_t master_key[KEY_SIZE])
	Buat cipher dan bangkitkan round key dari master key.
void	encrypt_block (const uint8_t *in, uint8_t *out) const override
	Enkripsi satu blok.
void	decrypt_block (const uint8_t *in, uint8_t *out) const override
	Dekripsi satu blok.

Detailed Description

Block cipher Feistel 16 round dengan fungsi F berbasis sigma-delta.

Blok 128 bit dibelah menjadi L dan R (masing-masing 64 bit). Tiap round:

L' = R
R' = L xor F(R, K[i])

Dekripsi memakai alur yang sama dengan urutan round key dibalik, sehingga F tidak perlu punya invers.

Round key dibangkitkan sekali di constructor.

Note

Objek bersifat immutable setelah dibuat, jadi aman dipakai bersamaan dari beberapa thread untuk read (encrypt/decrypt).

Contoh penggunaan:

uint8_t key[KEY_SIZE] = { ... };
uint8_t pt[BLOCK_SIZE] = { ... };
uint8_t ct[BLOCK_SIZE], back[BLOCK_SIZE];
 
CustomCipher cipher(key);
cipher.encrypt_block(pt, ct);
cipher.decrypt_block(ct, back);   // back == pt

Constructor & Destructor Documentation

CustomCipher()

CustomCipher::CustomCipher ( const uint8_t master_key[KEY_SIZE] )

explicit

Buat cipher dan bangkitkan round key dari master key.

Parameters

[in]

master_key

Master key, KEY_SIZE byte. Pointer tidak disimpan.

Member Function Documentation

decrypt_block()

void CustomCipher::decrypt_block ( const uint8_t * in, uint8_t * out ) const

overridevirtual

Dekripsi satu blok.

Parameters

[in]	in	Ciphertext, BLOCK_SIZE byte.
[out]	out	Plaintext, BLOCK_SIZE byte.

Implements BlockCipher.

encrypt_block()

void CustomCipher::encrypt_block ( const uint8_t * in, uint8_t * out ) const

overridevirtual

Enkripsi satu blok.

Parameters

[in]	in	Plaintext, BLOCK_SIZE byte.
[out]	out	Ciphertext, BLOCK_SIZE byte.

Implements BlockCipher.

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

• include/cipher.hpp
• src/core/cipher.cpp