Class: AadhaarAuth::Encrypter

Inherits:
Object
  • Object
show all
Defined in:
lib/aadhaar_auth/encrypter.rb

Constant Summary collapse

ENC_ALGO = 
'AES-256-ECB'

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.public_cert ⇒ Object 



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# File 'lib/aadhaar_auth/encrypter.rb', line 36

def public_cert
  @public_cert ||= OpenSSL::X509::Certificate.new(File.read(Config.public_certificate_path))
end

Instance Method Details

#calculate_hmac(data) ⇒ Object 



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# File 'lib/aadhaar_auth/encrypter.rb', line 27

def calculate_hmac(data)
  Base64.encode64(encrypt_using_session_key(Digest::SHA256.digest(data)))
end

#encrypt_using_session_key(data) ⇒ Object 



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# File 'lib/aadhaar_auth/encrypter.rb', line 20

def encrypt_using_session_key(data)
  aes = OpenSSL::Cipher.new(ENC_ALGO)
  aes.encrypt
  aes.key = session_key
  (aes.update(data) + aes.final)
end

#encrypted_session_key ⇒ Object 



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# File 'lib/aadhaar_auth/encrypter.rb', line 13

def encrypted_session_key
  @encrypted_session_key ||= begin
    public_key = public_cert.public_key
    Base64.encode64(public_key.public_encrypt(session_key))
  end
end

#public_cert ⇒ Object 



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# File 'lib/aadhaar_auth/encrypter.rb', line 31

def public_cert
  self.class.public_cert
end

#session_key ⇒ Object 



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# File 'lib/aadhaar_auth/encrypter.rb', line 5

def session_key
  @session_key ||= begin
    aes = OpenSSL::Cipher.new(ENC_ALGO)
    aes.encrypt
    aes.random_key
  end
end