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<p class="MsoNormal">I’m using an OpenSSL engine that uses the RSA_FLAG_SIGN_VER flag and implements RSA_METHOD.rsa_sign() instead rsa_priv_enc(). This is mainly because of the requirement that it work with Windows CryptoAPI which does not support low-level
RSA signing (see CAPI engine). Everything works as it should until FIPS mode is enabled. Under FIPS mode, the “non-implemented” rsa_priv_enc() is called and an error is returned. The simplified backtrace is:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">#0 rsa_priv_enc // non-implemented engine function<o:p></o:p></p>
<p class="MsoNormal">#1 FIPS_rsa_sign_digest // FIPS canister<o:p></o:p></p>
<p class="MsoNormal">#2 pkey_rsa_sign<o:p></o:p></p>
<p class="MsoNormal">#3 EVP_SignFinal<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It appears that FIPS_rsa_sign_digest() never checks RSA_FLAG_SIGN_VER or calls rsa_sign() - it simply defaults to rsa_priv_enc(). I can’t find any place rsa_sign is called.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There are posts that specifically reference running CAPI with FIPS mode, so I don’t know what I’m missing.<o:p></o:p></p>
<p class="MsoNormal"><a href="http://openssl.6102.n7.nabble.com/FIPS-with-CAPI-Engine-td26273.html">http://openssl.6102.n7.nabble.com/FIPS-with-CAPI-Engine-td26273.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Using OpenSSL 1.0.2o and FIPS canister 2.0.2 (older but I checked the latest release and it behaves the same).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you.<o:p></o:p></p>
<p class="MsoNormal">Paul<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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