diff --git b/libgamestream/client.c a/libgamestream/client.c
index bc6c020..2d547ce 100644
--- b/libgamestream/client.c
+++ a/libgamestream/client.c
@@ -494,15 +494,12 @@ int gs_pair(PSERVER_DATA server, char* pin) {
   char client_secret_data[16];
   RAND_bytes(client_secret_data, 16);
 
-  const ASN1_BIT_STRING *asnSignature;
-  X509_get0_signature(&asnSignature, NULL, cert);
-
   char challenge_response[16 + 256 + 16];
   char challenge_response_hash[32];
   char challenge_response_hash_enc[32];
   char challenge_response_hex[65];
   memcpy(challenge_response, challenge_response_data + hash_length, 16);
-  memcpy(challenge_response + 16, asnSignature->data, 256);
+  memcpy(challenge_response + 16, cert->signature->data, 256);
   memcpy(challenge_response + 16 + 256, client_secret_data, 16);
   if (server->serverMajorVersion >= 7)
     SHA256(challenge_response, 16 + 256 + 16, challenge_response_hash);