37 lines
1.3 KiB
JavaScript
37 lines
1.3 KiB
JavaScript
/* global describe, it */
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var assert = require('assert');
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var BigInteger = require('../src/jsbn/jsbn.js')
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var bytesToHex = require('../src/convert.js').bytesToHex;
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var secureRandom = require('secure-random');
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describe('BigInteger', function() {
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describe('toByteArraySigned', function() {
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it('handles examples', function() {
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function hex(num) {
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var bytes = BigInteger.valueOf(num).toByteArraySigned();
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var h = bytesToHex(bytes);
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return '0x' + h;
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}
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assert.equal(hex( 0), '0x');
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assert.equal(hex( 1), '0x01');
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assert.equal(hex(-1), '0x81');
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assert.equal(hex( 127), '0x7f');
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assert.equal(hex(-127), '0xff');
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assert.equal(hex( 255), '0x00ff');
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assert.equal(hex(-255), '0x80ff');
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assert.equal(hex( 16300), '0x3fac');
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assert.equal(hex(-16300), '0xbfac');
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assert.equal(hex( 62300), '0x00f35c');
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assert.equal(hex(-62300), '0x80f35c');
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})
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})
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describe('with RNG passed into constructor as the 2nd argument', function(){
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it('returns a BigInteger with the limit of the specified length', function(){
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var bitLength = 256
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var i = new BigInteger(bitLength, secureRandom)
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assert(i.bitLength() <= 256)
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})
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})
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})
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