/*! x509-1.1.js (c) 2012 Kenji Urushima | kjur.github.com/jsrsasign/license
 */
// 
// x509.js - X509 class to read subject public key from certificate.
//
// version: 1.1 (10-May-2012)
//
// Copyright (c) 2010-2012 Kenji Urushima (kenji.urushima@gmail.com)
//
// This software is licensed under the terms of the MIT License.
// http://kjur.github.com/jsrsasign/license
//
// The above copyright and license notice shall be 
// included in all copies or substantial portions of the Software.
// 

// Depends:
//   base64.js
//   rsa.js
//   asn1hex.js

function _x509_pemToBase64(sCertPEM) {
  var s = sCertPEM;
  s = s.replace("-----BEGIN CERTIFICATE-----", "");
  s = s.replace("-----END CERTIFICATE-----", "");
  s = s.replace(/[ \n]+/g, "");
  return s;
}

function _x509_pemToHex(sCertPEM) {
  var b64Cert = _x509_pemToBase64(sCertPEM);
  var hCert = b64tohex(b64Cert);
  return hCert;
}

function _x509_getHexTbsCertificateFromCert(hCert) {
  var pTbsCert = ASN1HEX.getStartPosOfV_AtObj(hCert, 0);
  return pTbsCert;
}

// NOTE: privateKeyUsagePeriod field of X509v2 not supported.
// NOTE: v1 and v3 supported
function _x509_getSubjectPublicKeyInfoPosFromCertHex(hCert) {
  var pTbsCert = ASN1HEX.getStartPosOfV_AtObj(hCert, 0);
  var a = ASN1HEX.getPosArrayOfChildren_AtObj(hCert, pTbsCert); 
  if (a.length < 1) return -1;
  if (hCert.substring(a[0], a[0] + 10) == "a003020102") { // v3
    if (a.length < 6) return -1;
    return a[6];
  } else {
    if (a.length < 5) return -1;
    return a[5];
  }
}

// NOTE: Without BITSTRING encapsulation.
function _x509_getSubjectPublicKeyPosFromCertHex(hCert) {
  var pInfo = _x509_getSubjectPublicKeyInfoPosFromCertHex(hCert);
  if (pInfo == -1) return -1;    
  var a = ASN1HEX.getPosArrayOfChildren_AtObj(hCert, pInfo); 
  
  if (a.length != 2) return -1;
  var pBitString = a[1];
  if (hCert.substring(pBitString, pBitString + 2) != '03') return -1;
  var pBitStringV = ASN1HEX.getStartPosOfV_AtObj(hCert, pBitString);

  if (hCert.substring(pBitStringV, pBitStringV + 2) != '00') return -1;
  return pBitStringV + 2;
}

function _x509_getPublicKeyHexArrayFromCertHex(hCert) {
  var p = _x509_getSubjectPublicKeyPosFromCertHex(hCert);
  var a = ASN1HEX.getPosArrayOfChildren_AtObj(hCert, p); 
  //var a = ASN1HEX.getPosArrayOfChildren_AtObj(hCert, a[3]); 
  if(LOG>4){
	  console.log('a is now');
	  console.log(a);
  }
  
  //if (a.length != 2) return [];
  if (a.length < 2) return [];

  var hN = ASN1HEX.getHexOfV_AtObj(hCert, a[0]);
  var hE = ASN1HEX.getHexOfV_AtObj(hCert, a[1]);
  if (hN != null && hE != null) {
    return [hN, hE];
  } else {
    return [];
  }
}

function _x509_getPublicKeyHexArrayFromCertPEM(sCertPEM) {
  var hCert = _x509_pemToHex(sCertPEM);
  var a = _x509_getPublicKeyHexArrayFromCertHex(hCert);
  return a;
}

// ===== get basic fields from hex =====================================
/**
 * get hexadecimal string of serialNumber field of certificate.<br/>
 * @name getSerialNumberHex
 * @memberOf X509#
 * @function
 */
function _x509_getSerialNumberHex() {
  return ASN1HEX.getDecendantHexVByNthList(this.hex, 0, [0, 1]);
}

/**
 * get hexadecimal string of issuer field of certificate.<br/>
 * @name getIssuerHex
 * @memberOf X509#
 * @function
 */
function _x509_getIssuerHex() {
  return ASN1HEX.getDecendantHexTLVByNthList(this.hex, 0, [0, 3]);
}

/**
 * get string of issuer field of certificate.<br/>
 * @name getIssuerString
 * @memberOf X509#
 * @function
 */
function _x509_getIssuerString() {
  return _x509_hex2dn(ASN1HEX.getDecendantHexTLVByNthList(this.hex, 0, [0, 3]));
}

/**
 * get hexadecimal string of subject field of certificate.<br/>
 * @name getSubjectHex
 * @memberOf X509#
 * @function
 */
function _x509_getSubjectHex() {
  return ASN1HEX.getDecendantHexTLVByNthList(this.hex, 0, [0, 5]);
}

/**
 * get string of subject field of certificate.<br/>
 * @name getSubjectString
 * @memberOf X509#
 * @function
 */
function _x509_getSubjectString() {
  return _x509_hex2dn(ASN1HEX.getDecendantHexTLVByNthList(this.hex, 0, [0, 5]));
}

/**
 * get notBefore field string of certificate.<br/>
 * @name getNotBefore
 * @memberOf X509#
 * @function
 */
function _x509_getNotBefore() {
  var s = ASN1HEX.getDecendantHexVByNthList(this.hex, 0, [0, 4, 0]);
  s = s.replace(/(..)/g, "%$1");
  s = decodeURIComponent(s);
  return s;
}

/**
 * get notAfter field string of certificate.<br/>
 * @name getNotAfter
 * @memberOf X509#
 * @function
 */
function _x509_getNotAfter() {
  var s = ASN1HEX.getDecendantHexVByNthList(this.hex, 0, [0, 4, 1]);
  s = s.replace(/(..)/g, "%$1");
  s = decodeURIComponent(s);
  return s;
}

// ===== read certificate =====================================

_x509_DN_ATTRHEX = {
    "0603550406": "C",
    "060355040a": "O",
    "060355040b": "OU",
    "0603550403": "CN",
    "0603550405": "SN",
    "0603550408": "ST",
    "0603550407": "L" };

function _x509_hex2dn(hDN) {
  var s = "";
  var a = ASN1HEX.getPosArrayOfChildren_AtObj(hDN, 0);
  for (var i = 0; i < a.length; i++) {
    var hRDN = ASN1HEX.getHexOfTLV_AtObj(hDN, a[i]);
    s = s + "/" + _x509_hex2rdn(hRDN);
  }
  return s;
}

function _x509_hex2rdn(hRDN) {
    var hType = ASN1HEX.getDecendantHexTLVByNthList(hRDN, 0, [0, 0]);
    var hValue = ASN1HEX.getDecendantHexVByNthList(hRDN, 0, [0, 1]);
    var type = "";
    try { type = _x509_DN_ATTRHEX[hType]; } catch (ex) { type = hType; }
    hValue = hValue.replace(/(..)/g, "%$1");
    var value = decodeURIComponent(hValue);
    return type + "=" + value;
}

// ===== read certificate =====================================


/**
 * read PEM formatted X.509 certificate from string.<br/>
 * @name readCertPEM
 * @memberOf X509#
 * @function
 * @param {String} sCertPEM string for PEM formatted X.509 certificate
 */
function _x509_readCertPEM(sCertPEM) {
  var hCert = _x509_pemToHex(sCertPEM);
  var a = _x509_getPublicKeyHexArrayFromCertHex(hCert);
  if(LOG>4){
	  console.log('HEX VALUE IS ' + hCert);
	  console.log('type of a' + typeof a);
	  console.log('a VALUE IS ');
	  console.log(a);
	  console.log('a[0] VALUE IS ' + a[0]);
	  console.log('a[1] VALUE IS ' + a[1]);
  }
  var rsa = new RSAKey();
  rsa.setPublic(a[0], a[1]);
  this.subjectPublicKeyRSA = rsa;
  this.subjectPublicKeyRSA_hN = a[0];
  this.subjectPublicKeyRSA_hE = a[1];
  this.hex = hCert;
}

function _x509_readCertPEMWithoutRSAInit(sCertPEM) {
  var hCert = _x509_pemToHex(sCertPEM);
  var a = _x509_getPublicKeyHexArrayFromCertHex(hCert);
  this.subjectPublicKeyRSA.setPublic(a[0], a[1]);
  this.subjectPublicKeyRSA_hN = a[0];
  this.subjectPublicKeyRSA_hE = a[1];
  this.hex = hCert;
}

/**
 * X.509 certificate class.<br/>
 * @class X.509 certificate class
 * @property {RSAKey} subjectPublicKeyRSA Tom Wu's RSAKey object
 * @property {String} subjectPublicKeyRSA_hN hexadecimal string for modulus of RSA public key
 * @property {String} subjectPublicKeyRSA_hE hexadecimal string for public exponent of RSA public key
 * @property {String} hex hexacedimal string for X.509 certificate.
 * @author Kenji Urushima
 * @version 1.0.1 (08 May 2012)
 * @see <a href="http://kjur.github.com/jsrsasigns/">'jwrsasign'(RSA Sign JavaScript Library) home page http://kjur.github.com/jsrsasign/</a>
 */
function X509() {
  this.subjectPublicKeyRSA = null;
  this.subjectPublicKeyRSA_hN = null;
  this.subjectPublicKeyRSA_hE = null;
  this.hex = null;
}

X509.prototype.readCertPEM = _x509_readCertPEM;
X509.prototype.readCertPEMWithoutRSAInit = _x509_readCertPEMWithoutRSAInit;
X509.prototype.getSerialNumberHex = _x509_getSerialNumberHex;
X509.prototype.getIssuerHex = _x509_getIssuerHex;
X509.prototype.getSubjectHex = _x509_getSubjectHex;
X509.prototype.getIssuerString = _x509_getIssuerString;
X509.prototype.getSubjectString = _x509_getSubjectString;
X509.prototype.getNotBefore = _x509_getNotBefore;
X509.prototype.getNotAfter = _x509_getNotAfter;