VUSB-Firmware for Attiny85 implementing HMAC one time password authentication
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#ifndef _TRUNC_H_
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#define _TRUNC_H_
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#include "hmac-sha1/hmac-sha1.h"
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#define SHA1_SIZE 20
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int32_t get_otp(uint8_t* hmac, uint8_t digits);
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int32_t get_otp_from_cnt(uint64_t cnt, uint8_t digits, uint8_t* secret, uint8_t sec_len);
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#endif
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