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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I am trying to bring up ikev2 sa between strongswan and cisco router.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The authentication method used is certificates and prf algorithm is SHA256.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I wanted to know what is the hash algorithm that is used while generating the signature in AUTH payload for strongswan.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Is it SHA1 or SHA256 ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I observed that if I generate the signature in AUTH payload using SHA256, it fails the signature validation<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">If I generate the signature in authentication payload using SHA1 , it passes the signature validation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">RFC quotes below in page 94 of 5996<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="page-break-before:always"><span lang="EN" style="font-family:"Courier New"">RSA Digital Signature 1<o:p></o:p></span></p>
<p class="MsoNormal" style="page-break-before:always"><span lang="EN" style="font-family:"Courier New""> Computed as specified in
<a href="https://tools.ietf.org/html/rfc5996#section-2.15">Section 2.15</a> using an RSA private key<o:p></o:p></span></p>
<p class="MsoNormal" style="page-break-before:always"><span lang="EN" style="font-family:"Courier New""> with RSASSA-PKCS1-v1_5 signature scheme specified in [<a href="https://tools.ietf.org/html/rfc5996#ref-PKCS1" title=""Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1"">PKCS1</a>]<o:p></o:p></span></p>
<p class="MsoNormal" style="page-break-before:always"><span lang="EN" style="font-family:"Courier New""> (implementers should note that IKEv1 used a different method for<o:p></o:p></span></p>
<p class="MsoNormal" style="page-break-before:always"><span lang="EN" style="font-family:"Courier New""> RSA signatures). To promote interoperability, implementations<o:p></o:p></span></p>
<p class="MsoNormal" style="page-break-before:always"><span lang="EN" style="font-family:"Courier New""> that support this type SHOULD support signatures that use SHA-1<o:p></o:p></span></p>
<p class="MsoNormal" style="page-break-before:always"><span lang="EN" style="font-family:"Courier New""> as the hash function and SHOULD use SHA-1 as the default hash<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN"> function when generating signatures</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">kalyani<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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