[hibernate-issues] [Hibernate-JIRA] Commented: (HV-491) Add support for MOD11 Algorithm

[Hardy Ferentschik (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HV-491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=42573#action_42573 ] 

Hardy Ferentschik commented on HV-491:
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Great idea. Any chance you want to contribute a patch ;-)
Here are some thoughts from my side. Maybe it would make sense to have a _Mod11_ constraint and as parameter we pass the mod11 algorithm type. If we go down this path it makes sense to re-work our _CreditCardNumber_ constraint. It implements the Luhn algorithm which is effectively Mod10. _CreditCardNumber_ can then use constraint composition. 
In fact we could also just have one single _ModCheck_ constraint and implement the different mod10 and mod11 algorithms there. WDYT?

> Add support for MOD11 Algorithm
> -------------------------------
>
>                 Key: HV-491
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-491
>             Project: Hibernate Validator
>          Issue Type: Improvement
>          Components: validators
>            Reporter: George Gastaldi
>
> It would be nice to add support for the MOD11 algorithm. It is described on http://joselop.es/mod-11 or http://en.wikipedia.org/wiki/MSI_Barcode#Mod_11_Check_Digit and it is  widely used on Brazil, such as CPF (Cadastro de Pessoa Física - http://en.wikipedia.org/wiki/Cadastro_de_Pessoas_F%C3%ADsicas), CNPJ (Cadastro de Pessoa Jurídica - National Registry of Corporations) and Título de Eleitor (Voter ID card)

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