Provide RSA2048 as per RFC

webrtc/base/opensslidentity.cc

Index: webrtc/base/opensslidentity.cc
diff --git a/webrtc/base/opensslidentity.cc b/webrtc/base/opensslidentity.cc
index de4e6a771e04f5f0c1924ba83313f790a16988a2..db61531c26c2173f3cfcd217bf052a4c76d8fbc6 100644
--- a/webrtc/base/opensslidentity.cc
+++ b/webrtc/base/opensslidentity.cc
@@ -33,9 +33,6 @@ namespace rtc {
 // We could have exposed a myriad of parameters for the crypto stuff,
 // but keeping it simple seems best.
 
-// Strength of generated keys. Those are RSA.
-static const int KEY_LENGTH = 1024;
-
 // Random bits for certificate serial number
 static const int SERIAL_RAND_BITS = 64;
 
@@ -49,12 +46,13 @@ static const int CERTIFICATE_WINDOW = -60*60*24;
 static EVP_PKEY* MakeKey(KeyType key_type) {
   LOG(LS_INFO) << "Making key pair";
   EVP_PKEY* pkey = EVP_PKEY_new();
-  if (key_type == KT_RSA) {
+  if (key_type == KT_RSA1024 || key_type == KT_RSA2048) {
+    int key_length = key_type == KT_RSA1024 ? 1024 : 2048;
     BIGNUM* exponent = BN_new();
     RSA* rsa = RSA_new();
     if (!pkey || !exponent || !rsa ||
         !BN_set_word(exponent, 0x10001) ||  // 65537 RSA exponent
-        !RSA_generate_key_ex(rsa, KEY_LENGTH, exponent, NULL) ||
+        !RSA_generate_key_ex(rsa, key_length, exponent, NULL) ||
         !EVP_PKEY_assign_RSA(pkey, rsa)) {
       EVP_PKEY_free(pkey);
       BN_free(exponent);