Yes! That was the problem. In order to use cipher "AECDH", SSL_CTX_set_ecdh_auto(ctx, 1) must be called first. Thanks Michael!! Norm On 5/24/16 15:52, Michael Wojcik wrote: >> From: openssl-users [mailto:openssl-users-bounces at openssl.org] On Behalf >> Of Norm Green >> Sent: Tuesday, May 24, 2016 13:40 >> >> I've tried both: >> >> SSL_CTX_set_cipher_list("AECDH") >> >> and: >> >> SSL_CTX_set_cipher_list("AECDH-AES256-SHA") >> >> on both the client and server side, both of which result in the dreaded >> "no shared cipher" error: >> >> error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared >> cipher:s3_srvr.c:1417: > You might run a wire trace to see what suites the client is actually advertising. > > And you are using TLS, right? > > For AECDH* (or any ECC suite), don't you have to tell OpenSSL what curve to use? I haven't implemented that bit myself in any applications, but my understanding is that with OpenSSL 1.0.2 you can just call SSL_CTX_set_ecdh_auto(ctx, 1). With 1.0.1 you have to specify a particular named curve with SSL_CTX_set_tmp_ecdh. >
