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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["check-digit","check-digits","checksum","luhn","luhn-algorithm","transposition"],"created_at":"2026-01-29T10:06:58.025Z","updated_at":"2026-01-29T10:06:58.100Z","avatar_url":"https://github.com/jancajthaml-go.png","language":"Go","funding_links":[],"categories":[],"sub_categories":[],"readme":"## luhn check-digit mod10 algorithm\n\n[![Go Report Card](https://goreportcard.com/badge/jancajthaml-go/luhn)](https://goreportcard.com/report/jancajthaml-go/luhn)\n\nAlgorithm will detect any single-digit error, as well as almost all transpositions of adjacent digits. It will not, however, detect transposition of the two-digit sequence 09 to 90 (or vice versa).\n\nIt is not intended to be a cryptographically secure hash function. It is mostly used for pre-flight credit card number validation as specified in [ISO/IEC 7812-1:2015](http://www.iso.org/iso/catalogue_detail?csnumber=66011)\n\n### Usage ###\n\n```\nimport \"github.com/jancajthaml-go/luhn\"\n\nok := luhn.Validate(\"00123014764700968325\")\n\ndigit, error := luhn.Digit(\"x\")\n\nchecksum := luhn.Generate(\"1\")\n```\n\n### Performance ###\n\n```\nBenchmarkLuhnSmall          200000000  13.9 ns/op  0 B/op  0 allocs/op\nBenchmarkLuhnLarge          50000000   31.8 ns/op  0 B/op  0 allocs/op\nBenchmarkLuhnSmallParallel  300000000  4.06 ns/op  0 B/op  0 allocs/op\nBenchmarkLuhnLargeParallel  100000000  15.0 ns/op  0 B/op  0 allocs/op\n```\n\nverify your performance by running `make benchmark`\n\n### Resources ###\n\n* [Credit Card Validation - Check Digits](https://web.eecs.umich.edu/~bartlett/credit_card_number.html)\n* [Wikipedia - Luhn algorithm](https://en.wikipedia.org/wiki/Luhn_algorithm)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjancajthaml-go%2Fluhn","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjancajthaml-go%2Fluhn","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjancajthaml-go%2Fluhn/lists"}