I did this

#0 0x00000000059e44d5 in BN_bin2bn (s=0x139ec030 "", len=32, ret=0x139ebf50)
at bn_lib.c:638
#1 0x00000000059ea8a1 in bnrand (pseudorand=0, rnd=0x139ebf50, bits=256,
top=-1, bottom=0) at bn_rand.c:192
#2 0x00000000059ea973 in BN_rand (rnd=0x139ebf50, bits=256, top=-1, bottom=0)
at bn_rand.c:206
#3 0x00000000059eabbe in bn_rand_range (pseudo=0, r=0x139ebf50,
range=0x139ebe70) at bn_rand.c:272
#4 0x00000000059eac9d in BN_rand_range (r=0x139ebf50, range=0x139ebe70)
at bn_rand.c:289
#5 0x0000000005a11a58 in EC_KEY_generate_key (eckey=0x139eb530)
at ec_key.c:263
#6 0x00000000056a4eff in ssl3_send_client_key_exchange (s=0x139b1d70)
at s3_clnt.c:2869
#7 0x000000000569f6e0 in ssl3_connect (s=0x139b1d70) at s3_clnt.c:430
#8 0x00000000056cd695 in SSL_connect (s=0x139b1d70) at ssl_lib.c:1008
#9 0x00000000056b5132 in ssl23_get_server_hello (s=0x139b1d70)
at s23_clnt.c:799
#10 0x00000000056b3fa9 in ssl23_connect (s=0x139b1d70) at s23_clnt.c:228
#11 0x00000000056cd695 in SSL_connect (s=0x139b1d70) at ssl_lib.c:1008
#12 0x0000000006023ff4 in ossl_connect_step2 (conn=0x134e2498, sockindex=0)
at vtls/openssl.c:2138
#13 0x0000000006025e90 in ossl_connect_common (conn=0x134e2498, sockindex=0,
nonblocking=true, done=0x117a8144) at vtls/openssl.c:2974
#14 0x0000000006025fc2 in Curl_ossl_connect_nonblocking (conn=0x134e2498,
sockindex=0, done=0x117a8144) at vtls/openssl.c:3008
#15 0x0000000006026e93 in Curl_ssl_connect_nonblocking (conn=0x134e2498,
sockindex=0, done=0x117a8144) at vtls/vtls.c:322
#16 0x0000000005fbf15d in https_connecting (conn=0x134e2498, done=0x117a8144)
at http.c:1385
#17 0x0000000005fbf0bb in Curl_http_connect (conn=0x134e2498, done=0x117a8144)
at http.c:1355
#18 0x0000000005fd87d9 in Curl_protocol_connect (conn=0x134e2498,
protocol_done=0x117a8144) at url.c:3727
#19 0x0000000005ff48a1 in multi_runsingle (multi=0x134ba6f8, now=...,
data=0xf41abe8) at multi.c:1567
#20 0x0000000005ff5a7a in curl_multi_perform (multi=0x134ba6f8,
running_handles=0x117a830c) at multi.c:2115
#21 0x0000000005fe9f6a in easy_transfer (multi=0x134ba6f8) at easy.c:727
#22 0x0000000005fea14c in easy_perform (data=0xf41abe8, events=false)
at easy.c:814
#23 0x0000000005fea196 in curl_easy_perform (data=0xf41abe8) at easy.c:833
#24 0x0000000000432c39 in HttpRequestGoogleGcm (http_ptr=0x117a8cb0,
url_str=0x4a9e00 "https://android.googleapis.com/gcm/send",
json_payload=0x134e1ff0 "{"registration_ids":["valuex"] "message":"h"}") at http_request.c:177

I expected the following

curl/libcurl version

libssl.so.1.0.0 => /opt/lib/libssl.so.1.0.0 (0x00007f18f0f20000)
libcrypto.so.1.0.0 => /opt/lib/libcrypto.so.1.0.0 (0x00007f18f0a8e000)
libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007f18f0878000)
libcurl.so.4 => /opt/lib/libcurl.so.4 (0x00007f18f05c6000)

[curl -V output perhaps?]

operating system

debian Linux 4.4.0-x86_64-linode63 x86_64

I'm getting some valgrind instrumentation noise when I connect using libcurl. always found it tricky to rationalise about some of the uninitialised warnings spat out by valgrind, so it maybe a false one.

==00:00:00:31.910 20121== Conditional jump or move depends on uninitialised value(s)
==00:00:00:31.911 20121== at 0x59E44D5: BN_bin2bn (bn_lib.c:638)
==00:00:00:31.911 20121== by 0x59EA8A0: bnrand (bn_rand.c:192)
==00:00:00:31.911 20121== by 0x59EA972: BN_rand (bn_rand.c:206)
==00:00:00:31.911 20121== by 0x59EABBD: bn_rand_range (bn_rand.c:272)
==00:00:00:31.911 20121== by 0x59EAC9C: BN_rand_range (bn_rand.c:289)
==00:00:00:31.911 20121== by 0x5A11A57: EC_KEY_generate_key (ec_key.c:263)
==00:00:00:31.911 20121== by 0x56A4EFE: ssl3_send_client_key_exchange (s3_clnt.c:2869)
==00:00:00:31.911 20121== by 0x569F6DF: ssl3_connect (s3_clnt.c:430)
==00:00:00:31.911 20121== by 0x56CD694: SSL_connect (ssl_lib.c:1008)
==00:00:00:31.911 20121== by 0x56B5131: ssl23_get_server_hello (s23_clnt.c:799)
==00:00:00:31.911 20121== by 0x56B3FA8: ssl23_connect (s23_clnt.c:228)
==00:00:00:31.911 20121== by 0x56CD694: SSL_connect (ssl_lib.c:1008)
==00:00:00:31.911 20121== Uninitialised value was created by a heap allocation
==00:00:00:31.911 20121== at 0x4C295E4: malloc (vg_replace_malloc.c:299)
==00:00:00:31.911 20121== by 0x5972B0E: default_malloc_ex (mem.c:79)
==00:00:00:31.911 20121== by 0x59731C5: CRYPTO_malloc (mem.c:342)
==00:00:00:31.911 20121== by 0x59EA69A: bnrand (bn_rand.c:138)
==00:00:00:31.911 20121== by 0x59EA972: BN_rand (bn_rand.c:206)
==00:00:00:31.911 20121== by 0x59EABBD: bn_rand_range (bn_rand.c:272)
==00:00:00:31.911 20121== by 0x59EAC9C: BN_rand_range (bn_rand.c:289)
==00:00:00:31.911 20121== by 0x5A11A57: EC_KEY_generate_key (ec_key.c:263)
==00:00:00:31.911 20121== by 0x56A4EFE: ssl3_send_client_key_exchange (s3_clnt.c:2869)
==00:00:00:31.911 20121== by 0x569F6DF: ssl3_connect (s3_clnt.c:430)
==00:00:00:31.911 20121== by 0x56CD694: SSL_connect (ssl_lib.c:1008)
==00:00:00:31.911 20121== by 0x56B5131: ssl23_get_server_hello (s23_clnt.c:799)