DeprecationWarning on Buffer

[exoego]

I see the below warning on Node.js 10.x and 12.x
[DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.

new Buffer(size) had been deprecated in Node.js 6.0.0 back in 2016-04-26.
https://nodejs.org/api/buffer.html#buffer_new_buffer_size

I suspect these lines

elliptic/dist/elliptic.js

Line 4367 in 71e4e8e

return this.toArrayLike(Buffer, endian, length);

elliptic/dist/elliptic.js

Line 4382 in 71e4e8e

var res = new ArrayType(reqLength);

[exoego]

Ah, sorry.
These lines come from bn.js.
I will transfer this issue there.
https://github.com/indutny/bn.js/blob/79dccc4d3274ffae17cfb54ce08703a98b1d4fe0/lib/bn.js

[exoego]

Ah, bn.js already addressed deprecation in latest version.
I think elliptic should update bn.js dependeny.
I will open a PR.

[fanatid]

Duplicate of #191 in some way.