Provide RSA2048 as per RFC

webrtc/base/opensslidentity.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 15 matching lines @@
 #include "webrtc/base/helpers.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/openssl.h"
 #include "webrtc/base/openssldigest.h"
 
 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;
 
 // Certificate validity lifetime
 static const int CERTIFICATE_LIFETIME = 60*60*24*30;  // 30 days, arbitrarily
 // Certificate validity window.
 // This is to compensate for slightly incorrect system clocks.
 static const int CERTIFICATE_WINDOW = -60*60*24;
 
 // Generate a key pair. Caller is responsible for freeing the returned object.
 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);
       RSA_free(rsa);
       LOG(LS_ERROR) << "Failed to make RSA key pair";
       return NULL;
     }
     // ownership of rsa struct was assigned, don't free it.
     BN_free(exponent);
   } else if (key_type == KT_ECDSA) {
@@ skipping 382 matching lines @@
      SSL_CTX_use_PrivateKey(ctx, key_pair_->pkey()) != 1) {
     LogSSLErrors("Configuring key and certificate");
     return false;
   }
   return true;
 }
 
 }  // namespace rtc
 
 #endif  // HAVE_OPENSSL_SSL_H