diff --git a/BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py b/BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py
index 1ae6ebb..4188f8e 100644
--- a/BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py
+++ b/BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py
@@ -176,7 +176,7 @@
     # 
     # Sign the input file using the specified private key and capture signature from STDOUT
     #
-    Process = subprocess.Popen('%s sha256 -sign "%s"' % (OpenSslCommand, args.PrivateKeyFileName), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+    Process = subprocess.Popen('%s sha1 -sha256 -sign "%s"' % (OpenSslCommand, args.PrivateKeyFileName), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
     Signature = Process.communicate(input=FullInputFileBuffer)[0]
     if Process.returncode <> 0:
       sys.exit(Process.returncode)
@@ -225,7 +225,7 @@
     #
     # Verify signature
     #    
-    Process = subprocess.Popen('%s sha256 -prverify "%s" -signature %s' % (OpenSslCommand, args.PrivateKeyFileName, args.OutputFileName), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+    Process = subprocess.Popen('%s sha1 -sha256 -prverify "%s" -signature %s' % (OpenSslCommand, args.PrivateKeyFileName, args.OutputFileName), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
     Process.communicate(input=FullInputFileBuffer)
     if Process.returncode <> 0:
       print 'ERROR: Verification failed'