new Buffer is deprecated and unsafe

test/constructor-test.js

@@ -164,15 +164,15 @@ describe('BN.js/Constructor', function () {
   // the Array code is able to handle Buffer
   describe('with Buffer input', function () {
     it('should not fail on empty Buffer', function () {
-      assert.equal(new BN(new Buffer(0)).toString(16), '0');
+      assert.equal(new BN(Buffer.alloc(0)).toString(16), '0');
     });
 
     it('should import/export big endian', function () {
-      assert.equal(new BN(new Buffer('010203', 'hex')).toString(16), '10203');
+      assert.equal(new BN(Buffer.from('010203', 'hex')).toString(16), '10203');
     });
 
     it('should import little endian', function () {
-      assert.equal(new BN(new Buffer('010203', 'hex'), 'le').toString(16), '30201');
+      assert.equal(new BN(Buffer.from('010203', 'hex'), 'le').toString(16), '30201');
     });
   });
 

test/pummel/dh-group-test.js

@@ -16,7 +16,7 @@ describe('BN.js/Slow DH test', function () {
       var mont = BN.red(new BN(group.prime, 16));
       var priv = new BN(group.priv, 16);
       var multed = base.toRed(mont).redPow(priv).fromRed();
-      var actual = new Buffer(multed.toArray());
+      var actual = Buffer.from(multed.toArray());
       assert.equal(actual.toString('hex'), group.pub);
     });
   });

test/red-test.js

@@ -222,7 +222,7 @@ describe('BN.js/Reduction context', function () {
       }
       return bits;
     }
-    var t = new Buffer('aff1651e4cd6036d57aa8b2a05ccf1a9d5a40166340ecbbdc55' +
+    var t = Buffer.from('aff1651e4cd6036d57aa8b2a05ccf1a9d5a40166340ecbbdc55' +
       'be10b568aa0aa3d05ce9a2fcec9df8ed018e29683c6051cb83e' +
       '46ce31ba4edb045356a8d0d80b', 'hex');
     var g = new BN('5c7ff6b06f8f143fe8288433493e4769c4d988ace5be25a0e24809670' +