Version 1.1.0

Author: Y0ursTruly

myRSA.js

@@ -0,0 +1,63 @@
+var crypto=require('crypto'), fs=require('fs')
+var padding=crypto.constants.RSA_PKCS1_OAEP_PADDING
+var rootDir=__dirname+(process.platform=="win32"?"\\":"/")
+const atob=(text)=>Buffer.from(text,'base64').toString('binary')
+const btoa=(text)=>Buffer.from(text,'binary').toString('base64')
+let oaepHash="sha256"
+
+function str2ab(str) {
+    const buf = new ArrayBuffer(str.length);
+    const bufView = new Uint8Array(buf);
+    for (let i = 0, strLen = str.length; i < strLen; i++) {
+        bufView[i] = str.charCodeAt(i);
+    }
+    return buf;
+}
+function ab2str(buf,getOwnPropertyNames) {
+    var buff=new Uint8Array(buf)
+    return Object.getOwnPropertyNames(buff)
+    .map(i=>String.fromCharCode(buff[i])).join('')
+}
+
+function make_RSA_keys(key_name){
+  let publicKeyEncoding={type:'spki',format:'pem'}
+  let privateKeyEncoding={type:'pkcs8',format:'pem'}
+  let {privateKey,publicKey}=crypto.generateKeyPairSync('rsa',
+    {modulusLength:4096,publicKeyEncoding,privateKeyEncoding}
+  )
+  fs.writeFileSync(rootDir+key_name+'-prv.pem',privateKey)
+  fs.writeFileSync(rootDir+key_name+'-pub.pem',publicKey)
+  return [privateKey, publicKey]
+}
+
+function get_RSA_keys(key_name){
+  return [
+    fs.readFileSync(rootDir+key_name+'-prv.pem'),
+    fs.readFileSync(rootDir+key_name+'-pub.pem')
+  ]
+}
+
+function rsa_decrypt(key,text){
+  if(typeof key=="string"){key=Buffer.from(key)}
+  return JSON.parse(text).map(txt=>{
+    let data=str2ab(atob(txt))
+    let result=crypto.privateDecrypt({key,padding,oaepHash},data)
+    return ab2str(result)
+  }).join('')
+}
+
+function rsa_encrypt(key,text){
+  var list=[], n=446
+  for(let i in text){
+    let index=(i-(i%n))/n
+    list[index]=list[index]!=undefined? list[index]+text[i]: text[i]
+  }
+  if(typeof key=="string"){key=Buffer.from(key)}
+  return JSON.stringify( list.map(txt=>{
+    let data=str2ab(txt)
+    let result=crypto.publicEncrypt({key,padding,oaepHash},data)
+    return btoa(ab2str(result))
+  }) )
+}
+
+module.exports={rsa_encrypt,rsa_decrypt,get_RSA_keys,make_RSA_keys,ab2str,str2ab}