One Time Pass

This one time token generator is based off RFC 4226 and generates tokens based on a shared secret and the time interval.

Variables

• Interval - default 30-seconds
• Entropy - number of bytes for Secret; default 20

Functions

• Sizer - specify the number of digits to emit; default 6
• Secret - random secret generator; eg. AW6TJVTYMAYJXLWFW2WWJ6D3Q5B2AY25
• HOTPToken - generation requires a secret and an interval timeframe
• Token - is a HOTPToken with current Interval seed
• Tokens - is a HOTPToken with a bracketed last|now|next current Interval seed range

func main() {

  secret := "secretsecretsecret"

  fmt.Println(otp.Token(secret))  // 397657
  fmt.Println(otp.Tokens(secret)) // [755604 397657 140422]

  otp.Sizer(10)

  fmt.Println(otp.Token(secret))  // 1545628642
  fmt.Println(otp.Tokens(secret)) // [0511092633 1545628642 1383583942]
  
}