diff --git a/src/util.js b/src/util.js
--- a/src/util.js
+++ b/src/util.js
@@ -16,6 +16,9 @@ export function bytes2int32s(arr){
 	return res;
 }
 
+/**
+ * Converts a 32 bit integer into 4 bytes in little endian order.
+ */
 export function int322bytes(x){
 	let res=[];
 	for(let i=0;i<4;i++){
@@ -25,6 +28,15 @@ export function int322bytes(x){
 	return res;
 }
 
+/**
+ * Converts a 32 bit integer into 4 bytes in big endian order.
+ */
+export function int322bytesBE(x){
+	let res=int322bytes(x);
+	res.reverse();
+	return res;
+}
+
 export function int32s2bytes(arr){
 	return arr.map(int322bytes).reduce((acc,bytes)=>acc.concat(bytes));
 }