46 lines
913 B
C
46 lines
913 B
C
/*
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* otpcli - command-line interface for HOTP and TOTP
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* Written in 2020-2021 by Lucas
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*
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* To the extent possible under law, the author(s) have dedicated all
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* copyright and related and neighboring rights to this software to the
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* public domain worldwide. This software is distributed without any
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* warranty.
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*
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* You should have received a copy of the CC0 Public Domain Dedication
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* along with this software. If not, see
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* <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#include <stdint.h>
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enum otp_type {
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OTP_HOTP,
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OTP_TOTP,
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};
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enum otp_hmac {
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OTP_HMAC_SHA1,
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OTP_HMAC_SHA256,
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OTP_HMAC_SHA512,
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};
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struct otpcfg {
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enum otp_type type;
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enum otp_hmac algorithm;
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unsigned int digits;
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const void *secret;
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size_t secretlen;
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union {
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struct {
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uint64_t counter;
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} hotp;
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struct {
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uint64_t time;
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unsigned int period;
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} totp;
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} u;
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};
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int32_t otp(const struct otpcfg *);
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