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https://issues.apache.org/jira/browse/SSHD-771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162527#comment-16162527
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Goldstein Lyor commented on SSHD-771:
-------------------------------------
Off-by-one value introduced in commit
[e0041fc60281b11037384abb79c3a94ef8bf8c5e|https://github.com/apache/mina-sshd/commit/e0041fc60281b11037384abb79c3a94ef8bf8c5e]
> SFTP server closes the connection when hmac-sha2-512 is used
> ------------------------------------------------------------
>
> Key: SSHD-771
> URL: https://issues.apache.org/jira/browse/SSHD-771
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 1.6.0
> Reporter: Andreas Bergander
> Assignee: Goldstein Lyor
> Attachments: SshdTest.java
>
>
> It seems like the SFTP server in sshd does not handle HMAC SHA-2-512 very
> well. If I set up a server which only accepts that HMAC, the server closes
> the connection as soon as I connect with a client.
> The server throws an exception in AbstractSession (row 1380) before closing
> the connection:
> {code}
> // Check the computed result with the received mac (just after the packet
> data)
> if (!BufferUtils.equals(inMacResult, 0, data, decoderLength + 4, macSize)) {
> throw new SshException(SshConstants.SSH2_DISCONNECT_MAC_ERROR, "MAC Error");
> }
> {code}
> If I switch the HMAC to SHA-2-256 everything works ok.
> I've attached a sample program which sets up a server. I've tested with a
> couple of different clients and all of them exposes the error in the server.
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