Class: ApplePay::PaymentToken::EncryptedData

Inherits:
Object
  • Object
show all
Defined in:
lib/apple_pay/payment_token/encrypted_data.rb

Defined Under Namespace

Classes: DecryptionFailed

Constant Summary collapse

MERCHANT_ID_OID = 
'1.2.840.113635.100.6.32'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(encoded_data) ⇒ EncryptedData

Returns a new instance of EncryptedData.



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# File 'lib/apple_pay/payment_token/encrypted_data.rb', line 10

def initialize(encoded_data)
  self.data = Base64.decode64 encoded_data
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/apple_pay/payment_token/encrypted_data.rb', line 8

def data
  @data
end

Instance Method Details

#decrypt!(client_cert, private_key, ephemeral_public_key_or_wrapped_key) ⇒ Object

NOTE: Payment Processing Certificate



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# File 'lib/apple_pay/payment_token/encrypted_data.rb', line 14

def decrypt!(client_cert, private_key, ephemeral_public_key_or_wrapped_key) # NOTE: Payment Processing Certificate
  merchant_id = merchant_id_in client_cert
  shared_secret = shared_secret_derived_from private_key, ephemeral_public_key_or_wrapped_key
  symmetric_key = symmetric_key_derived_from merchant_id, shared_secret
  cipher = OpenSSL::Cipher.new('aes-256-gcm')
  cipher.decrypt
  cipher.iv_len = 16 # NOTE: require ruby 2.4.0+ & openssl gem v2.0.0+
  cipher.key = symmetric_key
  cipher.auth_tag = data[-16..-1]
  cipher.update(data[0..-17]) + cipher.final
end