common/bitutil: using subtle.XORBytes for optimization

Author: cuiweixie

common/bitutil/bitutil.go

@@ -8,6 +8,7 @@
 package bitutil
 
 import (
+	"crypto/subtle"
 	"runtime"
 	"unsafe"
 )
@@ -18,10 +19,7 @@ const supportsUnaligned = runtime.GOARCH == "386" || runtime.GOARCH == "amd64" |
 // XORBytes xors the bytes in a and b. The destination is assumed to have enough
 // space. Returns the number of bytes xor'd.
 func XORBytes(dst, a, b []byte) int {
-	if supportsUnaligned {
-		return fastXORBytes(dst, a, b)
-	}
-	return safeXORBytes(dst, a, b)
+	return subtle.XORBytes(dst, a, b)
 }
 
 // fastXORBytes xors in bulk. It only works on architectures that support