diff --git a/blake.js b/blake.js
--- a/blake.js
+++ b/blake.js
@@ -1,6 +1,5 @@
 // https://tools.ietf.org/html/rfc7693
 
-const MASK=0xffffffff;
 const BLOCK_LEN=64;
 
 const IV=[0x6A09E667,0xBB67AE85,0x3C6EF372,0xA54FF53A,0x510E527F,0x9B05688C,0x1F83D9AB,0x5BE0CD19];
@@ -92,17 +91,19 @@ function blake2s(data,outputLen=32,key=[
 	return h.digest();
 }
 
-let msg=str2utf8("abc");
-let longMsg=str2utf8("0123456789.10.456789.20.456789.30.456789.40.456789.50.456789.60.456789.70.456789.80.456789.90.456789");
-let key=str2utf8("zoqpiz");
-let longKey=str2utf8("zoqpizjutyclcmkamzhhmhvchxjtefjy");
-console.log(bytes2hex(blake2s(msg,16))=="aa4938119b1dc7b87cbad0ffd200d0ae");
-console.log(bytes2hex(blake2s(msg,20))=="5ae3b99be29b01834c3b508521ede60438f8de17");
-console.log(bytes2hex(blake2s(msg,28))=="0b033fc226df7abde29f67a05d3dc62cf271ef3dfea4d387407fbd55");
-console.log(bytes2hex(blake2s(msg))=="508c5e8c327c14e2e1a72ba34eeb452f37458b209ed63a294d999b4c86675982");
-console.log(bytes2hex(blake2s(longMsg))=="59a44e5e417d07fb382505ee7e67c23e0d476d354abc81899960bcab677beee1");
-console.log(bytes2hex(blake2s(msg,32,key))=="0da0b6a54e8f294b60bb25c572700166ddb9d124257ff36f9f43f18b844adf9f");
-console.log(bytes2hex(blake2s(msg,32,longKey))=="09ef85c9942bebdeb866c6ade769220fd9b851aead642017f6d59bf7e2a32037");
-console.log(bytes2hex(blake2s([]))=="69217a3079908094e11121d042354a7c1f55b6482ca1a51e1b250dfd1ed0eef9");
-console.log(bytes2hex(blake2s(longMsg.slice(0,64)))=="70484f89974551454d596350dda8af2aa6f0811b527549b9ecfe7adede063753");
-console.log(bytes2hex(blake2s(longMsg.slice(0,65)))=="af14d4f74947bbde734d0e3015c667cc80676efe4349be235be8046e9e45e0ae");
+function testBlake(){
+	let msg=str2utf8("abc");
+	let longMsg=str2utf8("0123456789.10.456789.20.456789.30.456789.40.456789.50.456789.60.456789.70.456789.80.456789.90.456789");
+	let key=str2utf8("zoqpiz");
+	let longKey=str2utf8("zoqpizjutyclcmkamzhhmhvchxjtefjy");
+	console.log(bytes2hex(blake2s(msg,16))=="aa4938119b1dc7b87cbad0ffd200d0ae");
+	console.log(bytes2hex(blake2s(msg,20))=="5ae3b99be29b01834c3b508521ede60438f8de17");
+	console.log(bytes2hex(blake2s(msg,28))=="0b033fc226df7abde29f67a05d3dc62cf271ef3dfea4d387407fbd55");
+	console.log(bytes2hex(blake2s(msg))=="508c5e8c327c14e2e1a72ba34eeb452f37458b209ed63a294d999b4c86675982");
+	console.log(bytes2hex(blake2s(longMsg))=="59a44e5e417d07fb382505ee7e67c23e0d476d354abc81899960bcab677beee1");
+	console.log(bytes2hex(blake2s(msg,32,key))=="0da0b6a54e8f294b60bb25c572700166ddb9d124257ff36f9f43f18b844adf9f");
+	console.log(bytes2hex(blake2s(msg,32,longKey))=="09ef85c9942bebdeb866c6ade769220fd9b851aead642017f6d59bf7e2a32037");
+	console.log(bytes2hex(blake2s([]))=="69217a3079908094e11121d042354a7c1f55b6482ca1a51e1b250dfd1ed0eef9");
+	console.log(bytes2hex(blake2s(longMsg.slice(0,64)))=="70484f89974551454d596350dda8af2aa6f0811b527549b9ecfe7adede063753");
+	console.log(bytes2hex(blake2s(longMsg.slice(0,65)))=="af14d4f74947bbde734d0e3015c667cc80676efe4349be235be8046e9e45e0ae");
+}