https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215946
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: jasonma...@gmail.com
CC: freebsd-am...@freebsd.org
CC: freebsd-am...@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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