ChaCha20

Implementation of the ChaCha stream cipher as first described by D. J. Bernstein (http://cr.yp.to/chacha.html), following RFC 7539.

Standard: RFC 7539

Note: This might not be compatible with BouncyCastle's implementation because that one uses a 64-bit counter.

struct ChaCha20 {

@safe nothrow @nogc

void start(bool forEncryption, ubyte[] key, ubyte[] iv);

ubyte returnByte(ubyte input);

ubyte[] processBytes(ubyte[] input, ubyte[] output);

void reset();

static void initState(uint[16] state, ubyte[] key, uint counter, ubyte[] nonce);

static void block(uint[16] inState, uint[16] outState);

static void block(uint[16] inState, ubyte[16 * 4] outState);

}

Destructor

~this ~this(): Undocumented in source.

Members

Functions

processBytes ubyte[] processBytes(ubyte[] input, ubyte[] output)
reset deprecated void reset(): Reset the cipher to its initial state. Same as calling start() with same parameters again. Warning: Don't encrypt different data with the same initial state.
returnByte ubyte returnByte(ubyte input): Process a single byte.
start void start(bool forEncryption, ubyte[] key, ubyte[] iv): Initialize the ChaCha20 stream cipher.

Manifest constants

name enum name;: Undocumented in source.

Static functions

block void block(uint[16] inState, uint[16] outState): Performs the ChaCha block function on inState, result in outState
block void block(uint[16] inState, ubyte[16 * 4] outState): Performs the ChaCha block function on inState, result in outState
initState void initState(uint[16] state, ubyte[] key, uint counter, ubyte[] nonce): Set the state as follows: state = constants ~ key ~ counter ~ nonce

Meta

Source

See Implementation

dcrypt crypto engines chacha structs

ChaCha20