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Google Authenticator for Go

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dgoogauth's Issues

illegal base32 at byte 24

I received this error when decoding my 26 character secret.

You should probably update your code to decode the secret using this: gokyle/twofactor#10 (comment)

Spelling fix

In readme.md RTC 6238 should probably be RFC 6238.

Thanks for a very useful library.

I would like to include this library in one of my side projects but I don't want to violate your rights. Could you please update this repository with a LICENSE file so people understand the restrictions on its use?

See: https://opensource.org/licenses

Google has a very useful document which discusses its legal positions on each of the open source licenses as far as being consumed for commercial purposes. It's a good way to understand the consequences of certain licenses such as the WTFPL: https://opensource.google.com/docs/thirdparty/licenses/

ComputeCode sometimes returns to few digits

The following function sometimes returns 5 digits instead of 6:

dgoogauth/googauth.go

Lines 27 to 49 in 96977cb

    
           func ComputeCode(secret string, value int64) int { 
        
           	key, err := base32.StdEncoding.DecodeString(secret) 
        
           	if err != nil { 
        
           		return -1 
        
           	} 
        
           	hash := hmac.New(sha1.New, key) 
        
           	err = binary.Write(hash, binary.BigEndian, value) 
        
           	if err != nil { 
        
           		return -1 
        
           	} 
        
           	h := hash.Sum(nil) 
        
           	offset := h[19] & 0x0f 
        
           	truncated := binary.BigEndian.Uint32(h[offset : offset+4]) 
        
           	truncated &= 0x7fffffff 
        
           	code := truncated % 1000000 
        
           	return int(code) 
        
           }

e.g.

package main

import (
  "crypto/hmac"
  "crypto/sha1"
  "encoding/base32"
  "encoding/binary"
  "fmt"
  "time"

  "github.com/dgryski/dgoogauth"
)

func main() {
  secret := []byte{'H', 'e', 'l', 'l', 'o', '!', 0xDE, 0xAD, 0xBE, 0xEF}
  secretEnc := base32.StdEncoding.EncodeToString(secret)

  var t0 int64
  t0 = int64(time.Now().Unix() / 2)
  code := dgoogauth.ComputeCode(secretEnc, t0)

  fmt.Printf("code = %+v\n", code)
}

func ComputeCode(secret string, value int64) int {
  key, err := base32.StdEncoding.DecodeString(secret)
  if err != nil {
    return -1
  }

  hash := hmac.New(sha1.New, key)
  err = binary.Write(hash, binary.BigEndian, value)
  if err != nil {
    return -1
  }
  h := hash.Sum(nil)

  offset := h[19] & 0x0f

  truncated := binary.BigEndian.Uint32(h[offset : offset+4])

  truncated &= 0x7fffffff
  code := truncated % 1000000

  return int(code)
}

Outputs the following when looped:

code = 292234
code = 108363
code = 108363
code = 828914
code = 45510
code = 45510
code = 45288
code = 45288
code = 286406
code = 166336
code = 166336
code = 569768
code = 569768

dgryski / dgoogauth Goto Github PK

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dgoogauth's Issues

illegal base32 at byte 24

Spelling fix

Add LICENSE

ComputeCode sometimes returns to few digits

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	func ComputeCode(secret string, value int64) int {

	key, err := base32.StdEncoding.DecodeString(secret)
	if err != nil {
	return -1
	}

	hash := hmac.New(sha1.New, key)
	err = binary.Write(hash, binary.BigEndian, value)
	if err != nil {
	return -1
	}
	h := hash.Sum(nil)

	offset := h[19] & 0x0f

	truncated := binary.BigEndian.Uint32(h[offset : offset+4])

	truncated &= 0x7fffffff
	code := truncated % 1000000

	return int(code)
	}