chacha20.h

#ifndef CHACHA20_H
#define CHACHA20_H

#include <stdint.h>

#define ChaCha20StateSizeBytes 48;
#define ChaCha20KeySizeByte 32
#define ChaCha20NonceSizeByte 12
#define ChaCha20CounterSizeByte 4






#ifdef __cplusplus
extern "C" {
#endif


void ChaCha20SetKey(uint8_t * state, const uint8_t *Key);
void ChaCha20SetNonce(uint8_t * state, const uint8_t *Nonce);
void ChaCha20SetCtr(uint8_t * state, const uint8_t *Ctr);
void ChaCha20EncryptBytes(uint8_t * state, uint8_t * In, uint8_t * Out, const uint64_t Size); //if In=nullptr - just fill Out
void ChaCha20IncrementNonce(uint8_t * state);



inline void ChaCha20AddCounter(uint8_t* ChaCha, const uint32_t value_to_add)
{
	uint32_t* State32bits = (uint32_t*)ChaCha;
	State32bits[8]+=value_to_add;
}


#ifdef __cplusplus
}
#endif




#endif // CHACHA20_H