From cee51d551acb04ac602eaa9055c373324d064de1 Mon Sep 17 00:00:00 2001
From: Alba Mendez <me@alba.sh>
Date: Tue, 5 Jan 2021 22:00:14 +0100
Subject: [PATCH] add RC4 cipher

---
 README.md    |  2 +-
 browser.js   | 11 ++++++++++-
 package.json |  1 +
 test.js      |  5 +++++
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 3c0b157..38e681b 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,4 @@ browserify-cipher
 [![Build Status](https://travis-ci.org/crypto-browserify/browserify-cipher.svg)](https://travis-ci.org/crypto-browserify/browserify-cipher)
 
 Provides createCipher, createDecipher, createCipheriv, createDecipheriv and
-getCiphers for the browserify.  Includes AES and DES ciphers.
+getCiphers for the browserify.  Includes AES, DES and RC4 ciphers.
diff --git a/browser.js b/browser.js
index 444825b..cedbe6e 100644
--- a/browser.js
+++ b/browser.js
@@ -1,3 +1,4 @@
+var RC4 = require('browserify-rc4')
 var DES = require('browserify-des')
 var aes = require('browserify-aes/browser')
 var aesModes = require('browserify-aes/modes')
@@ -14,6 +15,9 @@ function createCipher (suite, password) {
   } else if (desModes[suite]) {
     keyLen = desModes[suite].key * 8
     ivLen = desModes[suite].iv
+  } else if (suite === 'rc4') {
+    keyLen = 16
+    ivLen = 0
   } else {
     throw new TypeError('invalid suite type')
   }
@@ -32,6 +36,9 @@ function createDecipher (suite, password) {
   } else if (desModes[suite]) {
     keyLen = desModes[suite].key * 8
     ivLen = desModes[suite].iv
+  } else if (suite === 'rc4') {
+    keyLen = 16
+    ivLen = 0
   } else {
     throw new TypeError('invalid suite type')
   }
@@ -44,6 +51,7 @@ function createCipheriv (suite, key, iv) {
   suite = suite.toLowerCase()
   if (aesModes[suite]) return aes.createCipheriv(suite, key, iv)
   if (desModes[suite]) return new DES({ key: key, iv: iv, mode: suite })
+  if (suite === 'rc4') return new RC4(key, iv)
 
   throw new TypeError('invalid suite type')
 }
@@ -52,12 +60,13 @@ function createDecipheriv (suite, key, iv) {
   suite = suite.toLowerCase()
   if (aesModes[suite]) return aes.createDecipheriv(suite, key, iv)
   if (desModes[suite]) return new DES({ key: key, iv: iv, mode: suite, decrypt: true })
+  if (suite === 'rc4') return new RC4(key, iv)
 
   throw new TypeError('invalid suite type')
 }
 
 function getCiphers () {
-  return Object.keys(desModes).concat(aes.getCiphers())
+  return Object.keys(desModes).concat(aes.getCiphers()).concat(['rc4'])
 }
 
 exports.createCipher = exports.Cipher = createCipher
diff --git a/package.json b/package.json
index 9168754..2b6dbe2 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "dependencies": {
     "browserify-aes": "^1.0.4",
     "browserify-des": "^1.0.0",
+    "browserify-rc4": "^1.0.0",
     "evp_bytestokey": "^1.0.0"
   },
   "browser": "browser.js",
diff --git a/test.js b/test.js
index d4beaa0..ab1037f 100644
--- a/test.js
+++ b/test.js
@@ -53,3 +53,8 @@ Object.keys(desModes).forEach(function (modeName) {
   var mode = desModes[modeName]
   runIvTest(modeName, mode.key, mode.iv)
 })
+
+// rc4 admits arbitrary key sizes
+runIvTest('rc4', 3, 0)
+runIvTest('rc4', 16, 0)
+runIvTest('rc4', 27, 0)