On 05/04/15 22:04, David Rufino wrote: > Hello, > > It's possible I'm doing something wrong here, but I can't seem to > negotiate ecdhe with an elliptic curve other than P-256. To reproduce > the issue, using openssl 1.0.2 > > openssl s_server -key server.key -cert server.crt -msg -debug -dhparam > dhparam.pem -cipher ECDHE-RSA-AES128-SHA -tls1_2 > > gnutls-cli 127.0.0.1 -p 4433 -d 4 --insecure > --priority="NORMAL:-KX-ALL:+ECDHE-RSA:-CURVE-ALL:+CURVE-SECP224R1" > > which gives the error > > :SSL routines:ssl3_get_client_hello:no shared cipher:s3_srvr.c:1366: > > changing to p256r1 succeeds. is there a particular why the negotation > would fail with p224 ? my understanding is that openssl supports all the > nist curves. Try adding "-named_curve secp224r1" to your s_server arguments. This specifies the curve to use for ECDHE keys. The default if you don't specify a named curve is P-256 which is why it works when you are using that curve. Matt
