Add explicit typecasts so it compiles using MSVC.

firmware/lib/cryptolib/rsa_utility.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Implementation of RSA utility functions.
  */
 
 #include "cryptolib.h"
 #include "stateful_util.h"
 #include "utility.h"
 
 int RSAProcessedKeySize(unsigned int algorithm, int* out_size) {
   int key_len; /* Key length in bytes. */
-  if (algorithm < kNumAlgorithms) {
+  if (algorithm < (unsigned int)kNumAlgorithms) {
     key_len =  siglen_map[algorithm];
     /* Total size needed by a RSAPublicKey structure is =
      *  2 * key_len bytes for the  n and rr arrays
      *  + sizeof len + sizeof n0inv.
      */
     *out_size = (2 * key_len + sizeof(uint32_t) + sizeof(uint32_t));
     return 1;
   }
   return 0;
 }
@@ skipping 53 matching lines @@
                       const uint8_t* buf,
                       uint64_t len,
                       const uint8_t* sig,
                       unsigned int algorithm) {
   RSAPublicKey* verification_key = NULL;
   uint8_t* digest = NULL;
   int key_size;
   int sig_size;
   int success;
 
-  if (algorithm >= kNumAlgorithms)
+  if (algorithm >= (unsigned int)kNumAlgorithms)
     return 0;  /* Invalid algorithm. */
   if (!RSAProcessedKeySize(algorithm, &key_size))
     return 0;
   sig_size = siglen_map[algorithm];
 
   if (key_blob && !key)
     verification_key = RSAPublicKeyFromBuf(key_blob, key_size);
   else if (!key_blob && key)
     verification_key = (RSAPublicKey*) key;  /* Supress const warning. */
   else
@@ skipping 18 matching lines @@
 int RSAVerifyBinaryWithDigest_f(const uint8_t* key_blob,
                                 const RSAPublicKey* key,
                                 const uint8_t* digest,
                                 const uint8_t* sig,
                                 unsigned int algorithm) {
   RSAPublicKey* verification_key = NULL;
   int key_size;
   int sig_size;
   int success;
 
-  if (algorithm >= kNumAlgorithms)
+  if (algorithm >= (unsigned int)kNumAlgorithms)
     return 0;  /* Invalid algorithm. */
   if (!RSAProcessedKeySize(algorithm, &key_size))
     return 0;
   sig_size = siglen_map[algorithm];
 
   if (key_blob && !key)
     verification_key = RSAPublicKeyFromBuf(key_blob, key_size);
   else if (!key_blob && key)
     verification_key = (RSAPublicKey*) key;  /* Supress const warning. */
   else
     return 0; /* Both can't be NULL or non-NULL. */
 
   /* Ensure we have a valid key. */
   if (!verification_key)
     return 0;
 
   success = RSAVerify(verification_key, sig, (uint32_t)sig_size,
                       (uint8_t)algorithm, digest);
 
   if (!key)
     RSAPublicKeyFree(verification_key);  /* Only free if we allocated it. */
   return success;
 }