Crypto1.h

#ifndef CRYPTO1_H
#define CRYPTO1_H

#include <stdint.h>
#include <stdbool.h>

/* Gets the current keystream-bit, without shifting the internal LFSR */
uint8_t Crypto1FilterOutput(void);

/* Set up Crypto1 cipher using the given Key, Uid and CardNonce. Also encrypts
 * the CardNonce in-place while in non-linear mode. */
void Crypto1Setup(uint8_t Key[6], uint8_t Uid[4], uint8_t CardNonce[4]);

/* Set up Crypto1 cipher using the given Key, Uid and CardNonce. Nested indicates
 * whether the CardNonce is encrypted (true) or not (false).
 * If the CardNonce is encrypted, it will we decrypted in-place. If not, it will
 * be fed into the LFSR, but remains unchanged. */
void Crypto1SetupReader(uint8_t Key[6], uint8_t Uid[4], uint8_t CardNonce[4], bool Nested);

/* Load the decrypted ReaderNonce into the Crypto1 state LFSR */
void Crypto1Auth(uint8_t EncryptedReaderNonce[4]);

/* Generate 8 Bits of key stream */
uint8_t Crypto1Byte(void);

/* Generate 4 Bits of key stream */
uint8_t Crypto1Nibble(void);

/* Execute 'ClockCount' cycles on the PRNG state 'State' */
void Crypto1PRNG(uint8_t State[4], uint16_t ClockCount);

/* Encrypts buffer with consideration of parity bits */
void Crypto1EncryptWithParity(uint8_t * Buffer, uint16_t BitCount);

/* Encrypts buffer with LFSR feedback within reader nonce and considers parity bits */
void Crypto1ReaderAuthWithParity(uint8_t PlainReaderAnswerWithParityBits[9]);

#endif //CRYPTO1_H