auto import from //depot/cupcake/@135843
diff --git a/fastboot/signfile.sh b/fastboot/signfile.sh
new file mode 100755
index 0000000..3188d2d
--- /dev/null
+++ b/fastboot/signfile.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ $# -ne 3 ]
+then
+ echo "Usage: $0 alias filename passpharse"
+ exit -1
+fi
+
+openssl dgst -passin pass:"$3" -binary -sha1 -sign $1.pem $2 > $2.sign
+