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365b575341* [feature] add TOTP two-factor authentication (2FA) * use byteutil.S2B to avoid allocations when comparing + generating password hashes * don't bother with string conversion for consts * use io.ReadFull * use MustGenerateSecret for backup codes * rename util functions
71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
/**
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* Copyright 2014 Paul Querna
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package otp implements both HOTP and TOTP based
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// one time passcodes in a Google Authenticator compatible manner.
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//
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// When adding a TOTP for a user, you must store the "secret" value
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// persistently. It is recommended to store the secret in an encrypted field in your
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// datastore. Due to how TOTP works, it is not possible to store a hash
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// for the secret value like you would a password.
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//
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// To enroll a user, you must first generate an OTP for them. Google
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// Authenticator supports using a QR code as an enrollment method:
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//
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// import (
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// "github.com/pquerna/otp/totp"
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//
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// "bytes"
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// "image/png"
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// )
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//
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// key, err := totp.Generate(totp.GenerateOpts{
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// Issuer: "Example.com",
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// AccountName: "alice@example.com",
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// })
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//
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// // Convert TOTP key into a QR code encoded as a PNG image.
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// var buf bytes.Buffer
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// img, err := key.Image(200, 200)
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// png.Encode(&buf, img)
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//
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// // display the QR code to the user.
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// display(buf.Bytes())
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//
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// // Now Validate that the user's successfully added the passcode.
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// passcode := promptForPasscode()
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// valid := totp.Validate(passcode, key.Secret())
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//
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// if valid {
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// // User successfully used their TOTP, save it to your backend!
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// storeSecret("alice@example.com", key.Secret())
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// }
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//
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// Validating a TOTP passcode is very easy, just prompt the user for a passcode
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// and retrieve the associated user's previously stored secret.
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//
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// import "github.com/pquerna/otp/totp"
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//
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// passcode := promptForPasscode()
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// secret := getSecret("alice@example.com")
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//
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// valid := totp.Validate(passcode, secret)
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//
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// if valid {
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// // Success! continue login process.
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// }
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package otp
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