rsa-pem.js

//
// rsa-pem.js - adding function for reading/writing PKCS#1 PEM private key
//              to RSAKey class.
//
// version: 1.0 (2010-Jun-03)
//
// Copyright (c) 2010 Kenji Urushima (kenji.urushima@gmail.com)
//
// This software is licensed under the terms of the MIT License.
// http://www.opensource.org/licenses/mit-license.php
//
// The above copyright and license notice shall be 
// included in all copies or substantial portions of the Software.
// 
//
// Depends on:
//
//
//
// _RSApem_pemToBase64(sPEM)
//
//   removing PEM header, PEM footer and space characters including
//   new lines from PEM formatted RSA private key string.
//
function _rsapem_pemToBase64(sPEMPrivateKey) {
  var s = sPEMPrivateKey;
  s = s.replace("-----BEGIN RSA PRIVATE KEY-----", "");
  s = s.replace("-----END RSA PRIVATE KEY-----", "");
  s = s.replace(/[ \n]+/g, "");
  return s;
}

function _rsapem_getPosArrayOfChildrenFromHex(hPrivateKey) {
  var a = new Array();
  var v1 = _asnhex_getStartPosOfV_AtObj(hPrivateKey, 0);
  var n1 = _asnhex_getPosOfNextSibling_AtObj(hPrivateKey, v1);
  var e1 = _asnhex_getPosOfNextSibling_AtObj(hPrivateKey, n1);
  var d1 = _asnhex_getPosOfNextSibling_AtObj(hPrivateKey, e1);
  var p1 = _asnhex_getPosOfNextSibling_AtObj(hPrivateKey, d1);
  var q1 = _asnhex_getPosOfNextSibling_AtObj(hPrivateKey, p1);
  var dp1 = _asnhex_getPosOfNextSibling_AtObj(hPrivateKey, q1);
  var dq1 = _asnhex_getPosOfNextSibling_AtObj(hPrivateKey, dp1);
  var co1 = _asnhex_getPosOfNextSibling_AtObj(hPrivateKey, dq1);
  a.push(v1, n1, e1, d1, p1, q1, dp1, dq1, co1);
  return a;
}

function _rsapem_getHexValueArrayOfChildrenFromHex(hPrivateKey) {
  var posArray = _rsapem_getPosArrayOfChildrenFromHex(hPrivateKey);
  var v =  _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[0]);
  var n =  _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[1]);
  var e =  _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[2]);
  var d =  _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[3]);
  var p =  _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[4]);
  var q =  _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[5]);
  var dp = _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[6]);
  var dq = _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[7]);
  var co = _asnhex_getHexOfV_AtObj(hPrivateKey, posArray[8]);
  var a = new Array();
  a.push(v, n, e, d, p, q, dp, dq, co);
  return a;
}

function _rsapem_readPrivateKeyFromPEMString(keyPEM) {
  var keyB64 = _rsapem_pemToBase64(keyPEM);
  var keyHex = b64tohex(keyB64) // depends base64.js
  var a = _rsapem_getHexValueArrayOfChildrenFromHex(keyHex);
  this.setPrivateEx(a[1],a[2],a[3],a[4],a[5],a[6],a[7],a[8]);
}

RSAKey.prototype.readPrivateKeyFromPEMString = _rsapem_readPrivateKeyFromPEMString;