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module ROTP
class HOTP < OTP
# Generates the OTP for the given count
# @param [Integer] count counter
# @option [Boolean] padding (false) Issue the number as a 0 padded string
# @returns [Integer] OTP
def at(count, padding=true)
generate_otp(count, padding)
end
# Verifies the OTP passed in against the current time OTP
# @param [String/Integer] otp the OTP to check against
# @param [Integer] counter the counter of the OTP
def verify(otp, counter)
super(otp, self.at(counter))
end
# Verifies the OTP passed in against the current time OTP, with a given number of retries.
# Returns the counter that was verified successfully
# @param [String/Integer] otp the OTP to check against
# @param [Integer] initial counter the counter of the OTP
# @param [Integer] number of retries
def verify_with_retries(otp, initial_count, retries = 1)
return false if retries <= 0
1.upto(retries) do |counter|
current_counter = initial_count + counter
return current_counter if verify(otp, current_counter)
end
false
end
# Returns the provisioning URI for the OTP
# This can then be encoded in a QR Code and used
# to provision the Google Authenticator app
# @param [String] name of the account
# @param [Integer] initial_count starting counter value, defaults to 0
# @return [String] provisioning uri
def provisioning_uri(name, initial_count=0)
encode_params("otpauth://hotp/#{URI.encode(name)}", :secret=>secret, :counter=>initial_count)
end
end
end
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