chase_tokenize_service.js.coffee

  #This function encrypts
  #returns encrypted card number (if successful) and code
  chaseEncrypt = (ccNumber, cvv) ->
    embed = embed_encryption
    card = {}
    payment_provider =
      options: {}

    if is_pie_encryption_download_error() || is_pie_key_download_error()
      scribe.log({user_id: user.id, error: 'cant load encryption js'}, 'payments_log', 'payments/credit_card/chase/tokenization/encrypting_card/failure')
      scribe.log({user_id: user.id, error: 'cant load encryption js'}, 'payments_log', 'payments/chase/javascript_failure')
      card.code = 2

    if embed && !ValidatePANChecksum(ccNumber)
      # Check MOD 10 digit, since PIE embedded encryption requires that the MOD 10 checksum is valid.
      scribe.log({user_id: user.id, error: 'credit card number invalid checksum'}, 'payments_log', 'payments/credit_card/chase/tokenization/encrypting_card/failure')
      card.code = 2

    #returns encrypted cc number, encrypted cvv and integrity check value
    response = ProtectPANandCVV(ccNumber, cvv, !embed)

    if response != null && cvv.match(/^[0-9]{3,4}$/) != null
      scribe.log({user_id: user.id, response: response}, 'payments_log', 'payments/credit_card/chase/tokenization/encrypting_card/success')
      card.code = 0
      payment_provider.options.embed_encryption = embed
      payment_provider.options.key = PIE.key_id
      payment_provider.options.phase = PIE.phase
      payment_provider.options.integrity_check = response[2]
      payment_provider.provider = 'chase'
      card.cc_number = response[0].replace(/\D/g,'')
      card.cvv = response[1]
      card.credit_card_tokens_attributes = [payment_provider]
    else
      scribe.log({user_id: user.id, response: response, error: 'invalid cc or cvv'}, 'payments_log', 'payments/credit_card/chase/tokenization/encrypting_card/failure')
      card.code = 1

    card

I would like to know where this ProtectPANandCVV function is coming from.