Validate securities identification numbers with ease!

Check-digit calculation is also available.

Currently supported standards: ISIN, CUSIP, SEDOL

Work in progress: IBAN.

Add this line to your application's Gemfile:

gem 'sec_id', '~> 4.0'

And then execute:

$ bundle

Or install it yourself as:

$ gem install sec_id

Base API has 4 main methods which can be used both on class level and on instance level:

• valid? - never raises any errors, always returns true or false, numbers without the check-digit will return false

  # class level
  SecId::ISIN.valid?('US5949181045') # => true
  SecId::ISIN.valid?('US594918104')  # => false
  
  # instance level
  isin = SecId::ISIN.new('US5949181045')
  isin.valid? # => true

• valid_format? - never raises any errors, always returns true or false, numbers without the check-digit but in valid format will return true

  # class level
  SecId::ISIN.valid_format?('US5949181045') # => true
  SecId::ISIN.valid_format?('US594918104') # => true
  
  # instance level
  isin = SecId::ISIN.new('US594918104')
  isin.valid_format? # => true

• restore! - restores check-digit and returns the full number, raises an error if number's format is invalid and thus check-digit is impossible to calculate

  # class level
  SecId::ISIN.restore!('US594918104') # => 'US5949181045'
  
  # instance level
  isin = SecId::ISIN.new('US5949181045')
  isin.restore! # => 'US5949181045'

• check_digit and calculate_check_digit - these are the same, but the former is used at class level for bravity, and the latter is used at instance level for clarity; it calculates and returns the check-digit if the number is valid and raises an error otherwise.

  # class level
  SecId::ISIN.check_digit('US594918104') # => 5
  
  # instance level
  isin = SecId::ISIN.new('US594918104')
  isin.calculate_check_digit # => 5
  isin.check_digit # => nil

  ❗ Please note that isin.check_digit returns nil because #check_digit at instance level represents original check-digit of the number passed to new, which in this example is missing and thus it's nil.

# class level
SecId::ISIN.valid?('US5949181045')       # => true
SecId::ISIN.valid_format?('US594918104') # => true
SecId::ISIN.restore!('US594918104')      # => 'US5949181045'
SecId::ISIN.check_digit('US594918104')   # => 5

# instance level
isin = SecId::ISIN.new('US5949181045')
isin.full_number           # => 'US5949181045'
isin.country_code          # => 'US'
isin.nsin                  # => '594918104'
isin.check_digit           # => 5
isin.valid?                # => true
isin.valid_format?         # => true
isin.restore!              # => 'US5949181045'
isin.calculate_check_digit # => 5

# class level
SecId::CUSIP.valid?('594918104')       # => true
SecId::CUSIP.valid_format?('59491810') # => true
SecId::CUSIP.restore!('59491810')      # => '594918104'
SecId::CUSIP.check_digit('59491810')   # => 5

# instance level
cusip = SecId::CUSIP.new('594918104')
cusip.full_number           # => '594918104'
cusip.cusip6                # => '594918'
cusip.issue                 # => '10'
cusip.check_digit           # => 4
cusip.valid?                # => true
cusip.valid_format?         # => true
cusip.restore!              # => '594918104'
cusip.calculate_check_digit # => 4

# class level
SecId::SEDOL.valid?('B0Z52W5')       # => true
SecId::SEDOL.valid_format?('B0Z52W') # => true
SecId::SEDOL.restore!('B0Z52W')      # => 'B0Z52W5'
SecId::SEDOL.check_digit('B0Z52W')   # => 5

# instance level
cusip = SecId::SEDOL.new('B0Z52W5')
cusip.full_number           # => 'B0Z52W5'
cusip.check_digit           # => 5
cusip.valid?                # => true
cusip.valid_format?         # => true
cusip.restore!              # => 'B0Z52W5'
cusip.calculate_check_digit # => 5

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.

Bug reports and pull requests are welcome on GitHub at https://github.com/svyatov/sec_id.

The gem is available as open source under the terms of the MIT License.