OEMCrypto v16.1 -- update ODK

This CL updates the ODK library to address review comments.

util/include/cdm_random.h

@@ -14,9 +14,18 @@ namespace wvcdm {
 // It's purpose is to simplified interface for C++11's <random> library.
 // Some of the methods use a "device specific" random seed, if the
 // compiler/device does not support device specific randomizers, then the
-// actual value supplied may not be random.
+// actual value supplied may not be random.  The generator is designed to
+// meet the C++ named requirement UniformRandomBitGenerator to allow it to
+// be used with standard library functions / class which are designed to
+// work with the standard library generators.
 class CdmRandomGenerator {
  public:
+  // Result type of operator().
+  using result_type = unsigned int;
+  // Inclusive boundaries of operator().
+  static constexpr unsigned int min() { return 0; }
+  static constexpr unsigned int max() { return RAND_MAX; }
+
   // The maximum number of bytes that can be generated at once for
   // `RandomData()`.
   static constexpr size_t kMaxRandomDataLength = 8192;  // 8 kB
@@ -44,12 +53,11 @@ class CdmRandomGenerator {
 
   // Returns a pseudo-random integer.
   // This is similar to `rand()` from the C standard library.  The integer
-  // returned is in the range of [0, RAND_MAX].
-  int Rand();
+  // returned is in the range of [min(), max()].
+  unsigned int Rand();
 
-  // Allows for RNG to be callable, this is to make it similar to the
-  // C++11 generator interfaces.
-  int operator()() { return Rand(); }
+  // Allows for RNG to be callable.
+  unsigned int operator()() { return Rand(); }
 
   // Returns a pseudo-random integer within the provided inclusive range.
   uint64_t RandomInRange(uint64_t lower, uint64_t upper);
@@ -79,7 +87,7 @@ class CdmRandomGenerator {
 // CdmRandomGenerator.
 class CdmRandom {
  public:
-  static int Rand() { return GetInstance()->Rand(); }
+  static unsigned int Rand() { return GetInstance()->Rand(); }
   static uint64_t RandomInRange(uint64_t lower, uint64_t upper) {
     return GetInstance()->RandomInRange(lower, upper);
   }