TOTP is an algorithm that uses a rolling window of time to calculate single use passwords. It is often used for two factor authentication. The Google Authenticator app uses TOTP to calculate one time passwords. This library implements TOTP code calculation in C#. This could be embedded in a mobile ...

*totp はまだ 草案 状態。 まず、基本としてどちらの生成方法でも ウェブサービス とアプリ（あるいはハードウェアトークン）に 秘密鍵 と呼ばれる秘密の暗号をお互い同じものを所持していなければならない。*SHA-512 (SHA-2) digest based TOTP. Declaration. Swift. public static var SHA512: TOTP {get} Show on GitHub. algorithm. DigestAlgorithm being used. Declaration. Swift. The default MAC algorithm to use with TOTP is HMAC−SHA1 and this is what is usually used. The tool supports two other MACs, namely the HMAC−SHA256 and HMAC−SHA512 as well. To use either of these, qualify the −−totp parameter with a value. Use "sha256" for HMAC−SHA256 and "sha512" for HMAC−SHA512. passlib.hash.sha256_crypt - SHA-256 Crypt¶. SHA-256 Crypt and SHA-512 Crypt were developed in 2008 by Ulrich Drepper , designed as the successor to md5_crypt.They include fixes and advancements such as variable rounds, and use of NIST-approved cryptographic primitives. TOTP is the time-based variant of this algorithm, where a value T, derived from a time reference and a time step, replaces the counter C in the HOTP computation.