3D Secure Recurring Payment

generate_hash_key() {
  local total="$1"
  local installment="$2"
  local currency_code="$3"
  local merchant_key="$4"
  local invoice_id="$5"
  local app_secret="$6"

  local data="${total}|${installment}|${currency_code}|${merchant_key}|${invoice_id}"

  local rand1
  rand1=$(openssl rand -hex 16)
  local iv
  iv=$(printf "%s" "$rand1" | openssl sha1 | awk '{print $2}' | cut -c1-16)

  local password
  password=$(printf "%s" "$app_secret" | openssl sha1 | awk '{print $2}')

  local rand2
  rand2=$(openssl rand -hex 16)
  local salt
  salt=$(printf "%s" "$rand2" | openssl sha1 | awk '{print $2}' | cut -c1-4)

  local salt_with_password
  salt_with_password=$(printf "%s" "${password}${salt}" | openssl sha256 | awk '{print $2}' | cut -c1-32)

  local key_hex
  key_hex=$(printf "%s" "$salt_with_password" | xxd -p -c 256)

  local iv_hex
  iv_hex=$(printf "%s" "$iv" | xxd -p -c 256)

  local encrypted_base64
  encrypted_base64=$(printf "%s" "$data" | openssl enc -aes-256-cbc -K "$key_hex" -iv "$iv_hex" -base64)

  local msg_encrypted_bundle="${iv}:${salt}:${encrypted_base64}"
  msg_encrypted_bundle="${msg_encrypted_bundle//\//__}"

  echo "$msg_encrypted_bundle"
}

total="100"
installment="1"
currency_code="TRY"
merchant_key="merchant_key"
invoice_id="invoice_id"
app_secret="app_secret"

result=$(generate_hash_key "$total" "$installment" "$currency_code" "$merchant_key" "$invoice_id" "$app_secret")
echo "$result"