lib/fintecture/utils/crypto.rb in fintecture-0.1.6 vs lib/fintecture/utils/crypto.rb in fintecture-0.1.7

@@ -1,47 +1,74 @@
 require 'securerandom'
 require 'openssl'
 require 'base64'
 require 'json'
+require 'fintecture/exceptions'
+require 'fintecture/utils/constants'
+require 'uri'
 
-
 module Fintecture
   module Utils
     class Crypto
       class << self
 
         def generate_uuid
-          SecureRandom.uuid.gsub!('-','')
+          SecureRandom.uuid
         end
 
+        def generate_uuid_only_chars
+          generate_uuid.gsub!('-','')
+        end
+
         def sign_payload(payload)
           payload = payload.to_json.to_s if payload.is_a? Hash
 
           digest = OpenSSL::Digest::SHA256.new
-          private_key = OpenSSL::PKey::RSA.new(Fintecture.app_private_key)
+          private_key = OpenSSL::PKey::RSA.new(Fintecture.private_key)
 
           begin
             signature = private_key.sign(digest, payload)
             Base64.strict_encode64(signature)
           rescue
-            raise 'error during signature'
+            raise Fintecture::CryptoException.new('error during signature')
           end
         end
 
         def decrypt_private(digest)
+          digest = URI.unescape digest
           encrypted_string = Base64.decode64(digest)
-          private_key = OpenSSL::PKey::RSA.new(Fintecture.app_private_key)
+          private_key = OpenSSL::PKey::RSA.new(Fintecture.private_key)
 
           begin
             private_key.private_decrypt(encrypted_string, OpenSSL::PKey::RSA::PKCS1_OAEP_PADDING)
+          rescue OpenSSL::PKey::RSAError => e
+            raise Fintecture::CryptoException.new("error while decrypt, #{e.message}")
           rescue
-            raise 'error during decryption'
+            raise Fintecture::CryptoException.new('error during decryption')
           end
         end
 
         def hash_base64(plain_text)
           digest = Digest::SHA256.digest plain_text
           Base64.strict_encode64(digest)
+        end
+
+        def create_signature_header(headers)
+          signing = []
+          header = []
+
+          Fintecture::Utils::Constants::SIGNEDHEADERPARAMETERLIST.each do |param|
+            next unless headers[param]
+
+            param_low = param.downcase
+            signing << "#{param_low}: #{headers[param]}"
+            header << param_low
+          end
+
+          # Double quote in join needed. If not we will get two slashes \\n
+          signature = sign_payload signing.join("\n")
+
+          'keyId="' + Fintecture.app_id + '",algorithm="rsa-sha256",headers="' + header.join(' ') + '",signature="' + signature + '"'
         end
 
       end
     end
   end
\ No newline at end of file