Fixing gcc 4.7 building problems.

crypto/third_party/nss/secsign.cc

 /*
  * Signature stuff.
  *
  * ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
@@ skipping 75 matching lines @@
       PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
       return SECFailure;
   }
 
   // Hash the input.
   std::vector<uint8> hash_data(HASH_ResultLen(hash_type));
   SECStatus rv = HASH_HashBuf(
       hash_type, &hash_data[0], input->data, input->len);
   if (rv != SECSuccess)
     return rv;
-  SECItem hash = {siBuffer, &hash_data[0], hash_data.size()};
+  SECItem hash = {siBuffer, &hash_data[0], 
+                  static_cast<unsigned int>(hash_data.size())};
 
   // Compute signature of hash.
   int signature_len = PK11_SignatureLen(key);
   std::vector<uint8> signature_data(signature_len);
-  SECItem sig = {siBuffer, &signature_data[0], signature_len};
+  SECItem sig = {siBuffer, &signature_data[0], 
+                 static_cast<unsigned int>(signature_len)};
   rv = PK11_Sign(key, &sig, &hash);
   if (rv != SECSuccess)
     return rv;
 
   CERTSignedData sd;
   PORT_Memset(&sd, 0, sizeof(sd));
   // Fill in tbsCertificate.
   sd.data.data = (unsigned char*) input->data;
   sd.data.len = input->len;
 
   // Fill in signatureAlgorithm.
   rv = SECOID_SetAlgorithmID(arena, &sd.signatureAlgorithm, algo_id, 0);
   if (rv != SECSuccess)
     return rv;
 
   // Fill in signatureValue.
   rv = DSAU_EncodeDerSigWithLen(&sd.signature, &sig, sig.len);
   if (rv != SECSuccess)
     return rv;
   sd.signature.len <<=  3;  // Convert to bit string.
 
   // DER encode the signed data object.
   void* encode_result = SEC_ASN1EncodeItem(
       arena, result, &sd, SEC_ASN1_GET(CERT_SignedDataTemplate));
 
   PORT_Free(sd.signature.data);
 
   return encode_result ? SECSuccess : SECFailure;
 }