Module: ActiveMerchant::Billing::Integrations::Banklink::Common

Included in:
DnbNordLtu::Common, SampoEst::Helper, SampoEst::Notification, SebEst::Helper, SebEst::Notification, SebLtu::Common, SwedbankEst::Helper, SwedbankEst::Notification, SwedbankLtu::Helper, SwedbankLtu::Notification
Defined in:
lib/active_merchant/billing/integrations/banklink.rb

Overview

Calculation using method VK_VERSION=008: VK_MAC is RSA signature of the request fields coded into BASE64. VK_MAC will be calculated using secret key of the sender using RSA. Signature will be calculated for string that consists of all field lengths and contents in the query. Also empty fields are used in calculation – lenght “000”. Unnumbered (optional) fields are not used in calculation. MAC(x1,x2,…,xn) := RSA( SHA-1(p(x1 )|| x1|| p(x2 )|| x2 || … ||p( xn )||xn),d,n) where: || is string concatenation mark x1, x2, …, xn are parameters of the query p(x) is the length of the field x in bytes, represented by three digits d is RSA secret exponent n is RSA modulus

Instance Method Summary collapse

Instance Method Details

#func_p(val) ⇒ Object

p(x) is the length of the field x in bytes, represented by three digits



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# File 'lib/active_merchant/billing/integrations/banklink.rb', line 124

def func_p(val)
  sprintf("%03i", val.bytesize)
end

#generate_data_string(service_msg_number, sigparams) ⇒ Object

Generate a string to be signed out of service message parameters. p(x1 )|| x1|| p(x2 )|| x2 || … ||p( xn )||xn || is string concatenation mark p(x) is length of the field x represented by three digits Parameters val1, val2, value3 would be turned into: ‘003val1003val2006value3’



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# File 'lib/active_merchant/billing/integrations/banklink.rb', line 134

def generate_data_string(service_msg_number, sigparams)
  str = ''
  required_service_params[Integer(service_msg_number)].each do |param|
    val = sigparams[param].to_s # nil goes to ''
    str << func_p(val) << val
  end
  str
end

#generate_mac(service_msg_number, sigparams) ⇒ Object 



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# File 'lib/active_merchant/billing/integrations/banklink.rb', line 148

def generate_mac(service_msg_number, sigparams)
  Base64.encode64(generate_signature(service_msg_number, sigparams)).gsub(/\n/,'')
end

#generate_signature(service_msg_number, sigparams) ⇒ Object 



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# File 'lib/active_merchant/billing/integrations/banklink.rb', line 143

def generate_signature(service_msg_number, sigparams)
  privkey = self.class.parent.get_private_key
  privkey.sign(OpenSSL::Digest::SHA1.new, generate_data_string(service_msg_number, sigparams))
end

#required_service_params ⇒ Object

Define required fields for each service message. We need to know this in order to calculate VK_MAC from a given hash of parameters. Order of the parameters is important.



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# File 'lib/active_merchant/billing/integrations/banklink.rb', line 48

def required_service_params
  {
    1001 => [
      'VK_SERVICE',
      'VK_VERSION',
      'VK_SND_ID',
      'VK_STAMP',
      'VK_AMOUNT',
      'VK_CURR',
      'VK_ACC',
      'VK_NAME',
      'VK_REF',
      'VK_MSG'],
    2001 => [
      'VK_SERVICE',
      'VK_VERSION',
      'VK_SND_ID',
      'VK_STAMP',
      'VK_AMOUNT',
      'VK_CURR',
      'VK_ACC',
      'VK_PANK',
      'VK_NAME',
      'VK_REF',
      'VK_MSG'],
    1002 => [
      'VK_SERVICE',
      'VK_VERSION',
      'VK_SND_ID',
      'VK_STAMP',
      'VK_AMOUNT',
      'VK_CURR',
      'VK_REF',
      'VK_MSG' ],
    1101 => [
      'VK_SERVICE',
      'VK_VERSION',
      'VK_SND_ID',
      'VK_REC_ID',
      'VK_STAMP',
      'VK_T_NO',
      'VK_AMOUNT',
      'VK_CURR',
      'VK_REC_ACC',
      'VK_REC_NAME',
      'VK_SND_ACC',
      'VK_SND_NAME',
      'VK_REF',
      'VK_MSG',
      'VK_T_DATE'],
    1201 => [
      'VK_SERVICE',
      'VK_VERSION',
      'VK_SND_ID',
      'VK_REC_ID',
      'VK_STAMP',
      'VK_AMOUNT',
      'VK_CURR',
      'VK_REC_ACC',
      'VK_REC_NAME',
      'VK_SND_ACC',
      'VK_SND_NAME',
      'VK_REF',
      'VK_MSG'],
    1901 => [
      'VK_SERVICE',
      'VK_VERSION',
      'VK_SND_ID',
      'VK_REC_ID',
      'VK_STAMP',
      'VK_REF',
      'VK_MSG']
  }
end