ChaCha20 Class Reference

A class for ChaCha20 256-bit stream cipher developed by Daniel J. More...

#include <chacha20.h>

Public Member Functions
	ChaCha20 ()
	ChaCha20 (const uint8_t *key, size_t keylen)
void	SetKey (const uint8_t *key, size_t keylen)
	set key with flexible keylength; 256bit recommended More...
void	SetIV (uint64_t iv)
void	Seek (uint64_t pos)
void	Keystream (uint8_t *c, size_t bytes)
	outputs the keystream of size <bytes> into More...
void	Crypt (const uint8_t *input, uint8_t *output, size_t bytes)
	enciphers the message <input> of length <bytes> and write the enciphered representation into <output> Used for encryption and decryption (XOR) More...

Private Attributes
uint32_t	input [16]

Detailed Description

A class for ChaCha20 256-bit stream cipher developed by Daniel J.

Bernstein https://cr.yp.to/chacha/chacha-20080128.pdf

Definition at line 15 of file chacha20.h.

Constructor & Destructor Documentation

ChaCha20() [1/2]

ChaCha20::ChaCha20

(

)

Definition at line 61 of file chacha20.cpp.

ChaCha20() [2/2]

ChaCha20::ChaCha20	(	const uint8_t *	key,
		size_t	keylen
	)

Definition at line 65 of file chacha20.cpp.

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Member Function Documentation

Crypt()

void ChaCha20::Crypt	(	const uint8_t *	input,
		uint8_t *	output,
		size_t	bytes
	)

enciphers the message <input> of length <bytes> and write the enciphered representation into <output> Used for encryption and decryption (XOR)

Definition at line 194 of file chacha20.cpp.

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Keystream()

void ChaCha20::Keystream	(	uint8_t *	c,
		size_t	bytes
	)

outputs the keystream of size <bytes> into

Definition at line 79 of file chacha20.cpp.

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Seek()

void ChaCha20::Seek

(

uint64_t

pos

)

Definition at line 74 of file chacha20.cpp.

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SetIV()

void ChaCha20::SetIV

(

uint64_t

iv

)

Definition at line 69 of file chacha20.cpp.

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SetKey()

void ChaCha20::SetKey	(	const uint8_t *	key,
		size_t	keylen
	)

set key with flexible keylength; 256bit recommended

Definition at line 32 of file chacha20.cpp.

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Member Data Documentation

input

uint32_t ChaCha20::input[16]

private

Definition at line 17 of file chacha20.h.

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

• /work/src/crypto/chacha20.h
• /work/src/crypto/chacha20.cpp