36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
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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