Package org.cryptacular.generator

Class AbstractOTPGenerator

java.lang.Object
org.cryptacular.generator.AbstractOTPGenerator
Direct Known Subclasses:
HOTPGenerator, TOTPGenerator
public abstract class AbstractOTPGenerator extends Object
Abstract base class for HOTP and TOTP OTP generation schemes.
Author:
Middleware Services

  • Constructor Details

    • AbstractOTPGenerator

      public AbstractOTPGenerator()

  • Method Details

    • getNumberOfDigits

      public int getNumberOfDigits()
      Returns:
      Number of digits in generated OTP.

    • setNumberOfDigits

      public void setNumberOfDigits(int digits)
      Sets the numbers in the generated OTP.
      Parameters:
      digits - Number of digits in generated OTP. MUST be in the range 6 - 9. Default is 6.

    • generateInternal

      protected int generateInternal(byte[] key, long count)
      Internal OTP generation method.
      Parameters:
      key - Per-user key.
      count - Counter moving factor.
      Returns:
      Integer OTP.

    • getDigest

      protected abstract org.bouncycastle.crypto.Digest getDigest()
      Returns:
      Digest algorithm used for HMAC operation.