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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m using StrongSwan 5.5.2 (built from source) with Linux 2.6 to connect to another machine also running StrongSwan.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m having an issue getting StrongSwan to use SHA2 as the integrity algorithm. Here’s an example of a working configuration that allows me to bring up an IPsec connection:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>ike=aes256-sha1-modp4096!<o:p></o:p></p><p class=MsoNormal>esp=aes256-sha1-modp4096!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>However, when I change it to this, I get an error:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>ike=aes256-sha256-modp4096!<o:p></o:p></p><p class=MsoNormal>esp=aes256-sha256-modp4096!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>This is the error returned by “ipsec up connName”: “received netlink error: Function not implemented (38)”<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>From what I can tell from Google, this means that my kernel doesn’t implement SHA256. Unfortunately, I’m stuck with the version of the kernel that I have.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Is there a configuration option to tell StrongSwan that the integrity algorithm should be used in userland? As I understand it, StrongSwan can use its own implementation or OpenSSL’s, but I’m having difficulty figuring out exactly how to do that.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Phillip Goldfarb<o:p></o:p></p></div></body></html>