Libraries tagged by check-digit

Helper classes to calculate and validate ckecksums

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This library is a set of static methods for GTIN validation. Methods return true if given string is publicly available GTIN-8, GTIN-12, GTIN-13 or GTIN-14 code. Checks include format, check digit and prefix.

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HKID digit check

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Check Digit Algorithms

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A PHP library that calculates and verifies the check digit using the Damm algorithm.

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Utility to calculate check digits on CNPJ (Brazilian Business Tax ID)

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Check Digit Validation for PHP 5.3+

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Base32 implementation of the Damm check digit algorithm

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Validate and generate Mexican identifiers — RFC, CURP, CLABE, NSS and código postal — with real check-digit verification. Framework-agnostic core with an optional Laravel bridge (rules, casts, Faker).

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Product-identity master data for SilverShop (CMS 6): EAN/GTIN and MPN on Product and Variation, with a reusable GS1 check-digit validator and CMS validation. A dependency-light foundation consumed (guarded) by the product-feed, catalog-data, SEO and conversion-tracking modules.

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Damm algorithm functions, a check digit algorithm that detects single-digit errors and adjacent transposition errors

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Routing Number Lookup is a bank routing number lookup and validation API for US ABA numbers. It checks the check digit, finds the bank name and state, and identifies the routing type and Federal Reserve district, while paid plans add full street addresses, branch details, and replacement numbers.

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IBAN Validator checks an IBAN's mod-97 checksum, its length and format for the country, and national check digits where the country defines them. It returns whether the IBAN is valid, the country and the reasons it fails. Paid plans add the bank code, branch code and account number, the correct check digits and the SEPA flag.

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Random IDs optimized for visual transcription, with a curated alphabet, normalization, and a built-in check character.

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