Add method to get random bytes from the TPM.

tpm_init.cc

Index: tpm_init.cc
diff --git a/tpm_init.cc b/tpm_init.cc
index 92f1c7e86d9de0e18a4e4dd98226e7f0d420d47d..e792141d52060cd328641cea1406e2fb63b6d58e 100644
--- a/tpm_init.cc
+++ b/tpm_init.cc
@@ -28,6 +28,7 @@ class TpmInitTask : public PlatformThread::Delegate {
   bool IsTpmEnabled();
   bool GetTpmPassword(chromeos::Blob* password);
   long GetInitializationMillis();
+  bool GetRandomData(int length, chromeos::Blob* data);
 
  private:
   scoped_ptr<tpm_init::Tpm> default_tpm_;
@@ -44,6 +45,10 @@ TpmInit::TpmInit()
 TpmInit::~TpmInit() {
 }
 
+bool TpmInit::GetRandomData(int length, chromeos::Blob* data) {
+  return tpm_init_->GetRandomData(length, data);
+}
+
 bool TpmInit::StartInitializeTpm() {
   tpm_init_->Init();
   if (!PlatformThread::CreateNonJoinable(0, tpm_init_.get())) {
@@ -125,4 +130,8 @@ long TpmInitTask::GetInitializationMillis() {
   return initialization_time_;
 }
 
+bool TpmInitTask::GetRandomData(int length, chromeos::Blob* data) {
+  return tpm_->GetRandomData(length, data);
+}
+
 }  // namespace tpm_init