@konfirm/iso7064 v2.1.2

ISO 7064

An implementation of check digit calculating algorithms described in the ISO/IEC 7064:2003 specification. Check digits are primarily used to quickly detect eratic input and are not intended for cryptographical purposes.

Installation

The ISO 7064 package is a scoped package, which means one needs to provide the scope (both in installation and use).

$ npm install --save @konfirm/iso7064

Usage

The ISO 7064 package provides several extendable classes of which all modulus-algorithms are ready for immediate use.

As of version 2.1 the ISO 7064 provides Typescript types and ES Modules.

Example

Using import (ES Modules, Typescript)

import { Mod97_10 } from '@konfirm/iso7064';

Or the CommonJS require

const { Mod97_10 } = require('@konfirm/iso7064');

Available exports

Methods

All algorithm implementations have the same methods, please refer to their respective documentation for the details on the exact in- and outputs.

Example using import (ES Modules, Typescript)

import { Mod11_2, Mod11_10 } from '@konfirm/iso7064';

console.log(Mod11_2.checksum('079')); //  'X'
console.log(Mod11_2.generate('079')); //  '079X'
console.log(Mod11_2.validate('079X')); //  true

console.log(Mod11_10.checksum('079')); // '2'
console.log(Mod11_10.generate('079')); // '0792'
console.log(Mod11_10.validate('0792')); // true

Example using require (CommonJS)

const { Mod11_2, Mod11_10 } = require('@konfirm/iso7064');

console.log(Mod11_2.checksum('079')); //  'X'
console.log(Mod11_2.generate('079')); //  '079X'
console.log(Mod11_2.validate('079X')); //  true

console.log(Mod11_10.checksum('079')); // '2'
console.log(Mod11_10.generate('079')); // '0792'
console.log(Mod11_10.validate('0792')); // true

Extending

The class architecture allows for easy implementation of your custom algorithm, it mostly consists of picking the right system (either pure or hybrid) and creating the appropriate configuration.

Example

The specification for International Standard Audiovisual Number (ISAN, ISO 15706-2:2007) details the use of the ISO 7064, MOD 17,16 algorithm, which in itself is not described in the ISO 7064 specification. The implementation however is simple to do.

The ISO 15706-2:2007 specification states it uses the hybrid system, with hexadecimal characters for the input and a single character checksum (from the same hexadecimal characters). This means the HybridISO7064 should be used, and the indices (allowed input characters) and alphabet should be provided. As the alphabet is the same as the indices we can omit it.

This leads to the following code

// const { HybridISO7064, Alphabet } = require('@konfirm/iso7064');
import { HybridISO7064, Alphabet } form '@konfirm/iso7064';

const Mod17_16 = new HybridISO7064({
	alphabet: Alphabet.from('0123456789ABCDEF')
});

console.log(Mod17_17.checksum('D98989898909898')); // 'B'
console.log(Mod17_17.generate('D98989898909898')); // 'D98989898909899B'
console.log(Mod17_17.validate('D98989898909898B')); // true
console.log(Mod17_17.validate('D98-989-898-909-898-B')); // true

NOTE Searching online for the contents of the ISO 15706-2:2007 specification may lead to a version of the specification which includes an error in the example output. The example number shown below the calculation steps is D98989898909899 with the supposed outcome of B (which should be 9), while the ISAN used used in the calculation steps table is D98989898909898 (last digit being 8 instead of 9).

There is an addendum available for the specification, ISO 15706-1:2002/Amd 1:2008, in which we assume the mistake was corrected (we haven't purchased the specification to verify).

API

ISO7064

This is the base class of the package, it contains all properties and methods used by both the Pure- and HybridISO7064 classes and extends (the Mod-algorithm extensions).

Constructor

New instances (such as the prepared Mod* implementations) are configured using an options object, the table below describes the type, defaults, purpose and whether the values are inherited by the factory method

Properties

Methods

PureISO7064

This is the base class for all pure systems. A pure system uses a single modulus for every stage of the checksum calculation.

As only the pure systems require the radix property, this class implements its default value.

Properties

The PureISO7064 class inherits all properties from ISO7064 and adds radix.

Methods

HybridISO7064

This is the base class for all hybrid systems. The hybrid systems use two different modulus operations, one equal to the number of characters in the checksum characters (indices) and the greater then that.

Properties

The Hybrid7064 class inherits all properties from ISO7064.

Methods

MOD 11-2

The ISO 7064, MOD 11-2 algorithm is used by several standards, including

• ORCID
• International Standard Name Identifier
• Resident Identity Card

Properties

Methods

MOD 11,10

The ISO 7064, MOD 11,10 algorithm is used by several standards, including

• Personal identification number

Properties

Methods

MOD 27,26

Properties

Methods

MOD 37-2

The ISO 7064, MOD 37-2 algorithm is used by several standards, including

• ISBT 128

Properties

Methods

MOD 37,36

The ISO 7064, MOD 37,36 algorithm is used by several standards, including

• Global Release Identifier (GRid)

Properties

Methods

MOD 97-10

Properties

Methods

MOD 661-26

Properties

Methods

MOD 1271-36

Properties

Methods

Credits

There a quite a few implementations of the ISO 7064 specification in various programming languages. From some we've taken the libery of using (parts of) the data samples for the unit tests.

• LiosK/cdigit JavaScript
• danieltwagner/iso7064 Java

License

MIT License Copyright (c) 2019-2022 Rogier Spieker (Konfirm)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.