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https://issues.apache.org/jira/browse/SSHD-1247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17494046#comment-17494046
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Lyor Goldstein commented on SSHD-1247:
--------------------------------------

The PPK headers seem to contain all the relevant data except for the output 
hash length - which is probably according to the selected encryption key size

> Add support for Argon2 encrypted PUTTY key files
> ------------------------------------------------
>
>                 Key: SSHD-1247
>                 URL: https://issues.apache.org/jira/browse/SSHD-1247
>             Project: MINA SSHD
>          Issue Type: New Feature
>            Reporter: Lyor Goldstein
>            Priority: Major
>         Attachments: SSHD-1247-private-RSA-123456.ppk, sshargon2.c, sshpubk.c
>
>
> In the attached file (protected with password=123456), it is possible to see 
> some new password protection key derivation algorithm
> {noformat}
> Key-Derivation: Argon2id
> Argon2-Memory: 8192
> Argon2-Passes: 5
> Argon2-Parallelism: 1
> Argon2-Salt: 6fdbdf2093b7697f46686e31506c1564
> {noformat}



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