initial commit

.gitignore

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+otp

LICENSE

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+Copyright (C) 2019 Marius Schellenberger
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * The names of the authors and/or contributors may not be used to
+      endorse or promote products derived from this software without
+      specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL ston1th BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+# otp - a simple TOTP code generator written in go
+
+## Usage
+
+```
+$ ./otp -h
+Usage of ./otp:
+  -loop
+        print new code every 30 seconds
+```
+
+## Example
+
+```
+$ ./otp
+Enter secret key:
+Code: 123456 Seconds left: 23
+```

go.mod

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+module otp
+
+go 1.12
+
+require (
+	github.com/pquerna/otp v1.2.0
+	golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586
+)

go.sum

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+github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc h1:biVzkmvwrH8WK8raXaxBx6fRVTlJILwEwQGL1I/ByEI=
+github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/pquerna/otp v1.2.0 h1:/A3+Jn+cagqayeR3iHs/L62m5ue7710D35zl1zJ1kok=
+github.com/pquerna/otp v1.2.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586 h1:7KByu05hhLed2MO29w7p1XfZvZ13m8mub3shuVftRs0=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

main.go

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+// Copyright (C) 2019 Marius Schellenberger
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"github.com/pquerna/otp/totp"
+	"golang.org/x/crypto/ssh/terminal"
+	"os"
+	"strconv"
+	"time"
+)
+
+var loop bool
+
+func init() {
+	flag.BoolVar(&loop, "loop", false, "print new code every 30 seconds")
+	flag.Parse()
+}
+
+func printCode(secret []byte) {
+	now := time.Now()
+	code, err := totp.GenerateCode(string(secret), now)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	s := 30 - (now.Second() % 30)
+	sec := strconv.Itoa(s)
+	if s < 10 {
+		sec = " " + sec
+	}
+	fmt.Printf("Code: %s Seconds left: %s", code, sec)
+}
+
+func main() {
+	fmt.Print("Enter secret key: ")
+	secret, err := terminal.ReadPassword(int(os.Stdin.Fd()))
+	fmt.Println("")
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	if loop {
+		for {
+			printCode(secret)
+			fmt.Print("\r")
+			time.Sleep(time.Second)
+		}
+	} else {
+		printCode(secret)
+		fmt.Println("")
+	}
+}