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bigint-crypto-utils
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Merge pull request #5 from coffee-converter/fix-randBits 

Fixes bug in randBits()
This commit is contained in:
Juan Hernández Serrano 2020-03-25 00:18:59 +01:00 committed by GitHub
parent 463d6fd8b0 4de924a186
commit 3602667de4
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GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 35 additions and 20 deletions
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3
.gitignore vendored
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@ -14,3 +14,6 @@ node_modules/
# Visual Studio Code
.vscode
# IntelliJ
.idea/

11
dist/bigint-crypto-utils-latest.browser.js vendored
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@ -360,11 +360,14 @@ var bigintCryptoUtils = (function (exports) {
throw new RangeError(`bitLength MUST be > 0 and it is ${bitLength}`);
const byteLength = Math.ceil(bitLength / 8);
let rndBytes = randBytesSync(byteLength, false);
// Fill with 0's the extra bits
rndBytes[0] = rndBytes[0] & (2 ** (bitLength % 8) - 1);
const rndBytes = randBytesSync(byteLength, false);
const bitLengthMod8 = bitLength % 8;
if (bitLengthMod8) {
// Fill with 0's the extra bits
rndBytes[0] = rndBytes[0] & (2 ** bitLengthMod8 - 1);
}
if (forceLength) {
let mask = (bitLength % 8) ? 2 ** ((bitLength % 8) - 1) : 128;
const mask = bitLengthMod8 ? 2 ** (bitLengthMod8 - 1) : 128;
rndBytes[0] = rndBytes[0] | mask;
}
return rndBytes;

2
dist/bigint-crypto-utils-latest.browser.min.js vendored
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File diff suppressed because one or more lines are too long

11
dist/bigint-crypto-utils-latest.browser.mod.js vendored
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@ -357,11 +357,14 @@ function randBits(bitLength, forceLength = false) {
throw new RangeError(`bitLength MUST be > 0 and it is ${bitLength}`);
const byteLength = Math.ceil(bitLength / 8);
let rndBytes = randBytesSync(byteLength, false);
// Fill with 0's the extra bits
rndBytes[0] = rndBytes[0] & (2 ** (bitLength % 8) - 1);
const rndBytes = randBytesSync(byteLength, false);
const bitLengthMod8 = bitLength % 8;
if (bitLengthMod8) {
// Fill with 0's the extra bits
rndBytes[0] = rndBytes[0] & (2 ** bitLengthMod8 - 1);
}
if (forceLength) {
let mask = (bitLength % 8) ? 2 ** ((bitLength % 8) - 1) : 128;
const mask = bitLengthMod8 ? 2 ** (bitLengthMod8 - 1) : 128;
rndBytes[0] = rndBytes[0] | mask;
}
return rndBytes;

2
dist/bigint-crypto-utils-latest.browser.mod.min.js vendored
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File diff suppressed because one or more lines are too long

11
dist/bigint-crypto-utils-latest.node.js vendored
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@ -376,11 +376,14 @@ function randBits(bitLength, forceLength = false) {
throw new RangeError(`bitLength MUST be > 0 and it is ${bitLength}`);
const byteLength = Math.ceil(bitLength / 8);
let rndBytes = randBytesSync(byteLength, false);
// Fill with 0's the extra bits
rndBytes[0] = rndBytes[0] & (2 ** (bitLength % 8) - 1);
const rndBytes = randBytesSync(byteLength, false);
const bitLengthMod8 = bitLength % 8;
if (bitLengthMod8) {
// Fill with 0's the extra bits
rndBytes[0] = rndBytes[0] & (2 ** bitLengthMod8 - 1);
}
if (forceLength) {
let mask = (bitLength % 8) ? 2 ** ((bitLength % 8) - 1) : 128;
const mask = bitLengthMod8 ? 2 ** (bitLengthMod8 - 1) : 128;
rndBytes[0] = rndBytes[0] | mask;
}
return rndBytes;

2
package-lock.json generated
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@ -1,6 +1,6 @@
{
"name": "bigint-crypto-utils",
"version": "2.5.0",
"version": "2.5.1",
"lockfileVersion": 1,
"requires": true,
"dependencies": {

2
package.json
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@ -1,6 +1,6 @@
{
"name": "bigint-crypto-utils",
"version": "2.5.0",
"version": "2.5.1",
"description": "Utils for working with cryptography using native JS implementation of BigInt. It includes arbitrary precision modular arithmetics, cryptographically secure random numbers and strong probable prime generation/testing.",
"keywords": [
"modular arithmetics",

11
src/main.js
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@ -400,11 +400,14 @@ export function randBits(bitLength, forceLength = false) {
throw new RangeError(`bitLength MUST be > 0 and it is ${bitLength}`);
const byteLength = Math.ceil(bitLength / 8);
let rndBytes = randBytesSync(byteLength, false);
// Fill with 0's the extra bits
rndBytes[0] = rndBytes[0] & (2 ** (bitLength % 8) - 1);
const rndBytes = randBytesSync(byteLength, false);
const bitLengthMod8 = bitLength % 8;
if (bitLengthMod8) {
// Fill with 0's the extra bits
rndBytes[0] = rndBytes[0] & (2 ** bitLengthMod8 - 1);
}
if (forceLength) {
let mask = (bitLength % 8) ? 2 ** ((bitLength % 8) - 1) : 128;
const mask = bitLengthMod8 ? 2 ** (bitLengthMod8 - 1) : 128;
rndBytes[0] = rndBytes[0] | mask;
}
return rndBytes;