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Subject: [Bug 215946] IPsec AH hmac-sha2 does not work with Linux
Date: Tue, 10 Jan 2017 18:35:08 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215946

            Bug ID: 215946
           Summary: IPsec AH hmac-sha2 does not work with Linux
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: jasonmader@gmail.com
                CC: freebsd-amd64@FreeBSD.org
                CC: freebsd-amd64@FreeBSD.org

IPsec AH doesn't appear to work with Linux when using the SHA2 hmac.

On the FreeBSD side,

add -n SRC DST ah 5000 -m transport -A hmac-sha2-384 0x96HEXKEY;

never works with the Linux,

ip xfrm state add src SRC dst DST proto ah spi 5000 auth-trunc "hmac(sha384=
)"
0x96HEXKEY 192 mode transport

I've tried a variety of truncation lengths (96, 128, 192) and hmac-sha2-256=
 but
none worked. However by changing to "-A hmac-sha1 0x40HEXKEY" which has a
default 96 bit truncation, AH worked between the two hosts.

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