/**
 * Javascript implementation of Abstract Syntax Notation Number One.
 *
 * @author Dave Longley
 *
 * Copyright (c) 2010-2015 Digital Bazaar, Inc.
 *
 * An API for storing data using the Abstract Syntax Notation Number One
 * format using DER (Distinguished Encoding Rules) encoding. This encoding is
 * commonly used to store data for PKI, i.e. X.509 Certificates, and this
 * implementation exists for that purpose.
 *
 * Abstract Syntax Notation Number One (ASN.1) is used to define the abstract
 * syntax of information without restricting the way the information is encoded
 * for transmission. It provides a standard that allows for open systems
 * communication. ASN.1 defines the syntax of information data and a number of
 * simple data types as well as a notation for describing them and specifying
 * values for them.
 *
 * The RSA algorithm creates public and private keys that are often stored in
 * X.509 or PKCS#X formats -- which use ASN.1 (encoded in DER format). This
 * class provides the most basic functionality required to store and load DSA
 * keys that are encoded according to ASN.1.
 *
 * The most common binary encodings for ASN.1 are BER (Basic Encoding Rules)
 * and DER (Distinguished Encoding Rules). DER is just a subset of BER that
 * has stricter requirements for how data must be encoded.
 *
 * Each ASN.1 structure has a tag (a byte identifying the ASN.1 structure type)
 * and a byte array for the value of this ASN1 structure which may be data or a
 * list of ASN.1 structures.
 *
 * Each ASN.1 structure using BER is (Tag-Length-Value):
 *
 * | byte 0 | bytes X | bytes Y |
 * |--------|---------|----------
 * |  tag   | length  |  value  |
 *
 * ASN.1 allows for tags to be of "High-tag-number form" which allows a tag to
 * be two or more octets, but that is not supported by this class. A tag is
 * only 1 byte. Bits 1-5 give the tag number (ie the data type within a
 * particular 'class'), 6 indicates whether or not the ASN.1 value is
 * constructed from other ASN.1 values, and bits 7 and 8 give the 'class'. If
 * bits 7 and 8 are both zero, the class is UNIVERSAL. If only bit 7 is set,
 * then the class is APPLICATION. If only bit 8 is set, then the class is
 * CONTEXT_SPECIFIC. If both bits 7 and 8 are set, then the class is PRIVATE.
 * The tag numbers for the data types for the class UNIVERSAL are listed below:
 *
 * UNIVERSAL 0 Reserved for use by the encoding rules
 * UNIVERSAL 1 Boolean type
 * UNIVERSAL 2 Integer type
 * UNIVERSAL 3 Bitstring type
 * UNIVERSAL 4 Octetstring type
 * UNIVERSAL 5 Null type
 * UNIVERSAL 6 Object identifier type
 * UNIVERSAL 7 Object descriptor type
 * UNIVERSAL 8 External type and Instance-of type
 * UNIVERSAL 9 Real type
 * UNIVERSAL 10 Enumerated type
 * UNIVERSAL 11 Embedded-pdv type
 * UNIVERSAL 12 UTF8String type
 * UNIVERSAL 13 Relative object identifier type
 * UNIVERSAL 14-15 Reserved for future editions
 * UNIVERSAL 16 Sequence and Sequence-of types
 * UNIVERSAL 17 Set and Set-of types
 * UNIVERSAL 18-22, 25-30 Character string types
 * UNIVERSAL 23-24 Time types
 *
 * The length of an ASN.1 structure is specified after the tag identifier.
 * There is a definite form and an indefinite form. The indefinite form may
 * be used if the encoding is constructed and not all immediately available.
 * The indefinite form is encoded using a length byte with only the 8th bit
 * set. The end of the constructed object is marked using end-of-contents
 * octets (two zero bytes).
 *
 * The definite form looks like this:
 *
 * The length may take up 1 or more bytes, it depends on the length of the
 * value of the ASN.1 structure. DER encoding requires that if the ASN.1
 * structure has a value that has a length greater than 127, more than 1 byte
 * will be used to store its length, otherwise just one byte will be used.
 * This is strict.
 *
 * In the case that the length of the ASN.1 value is less than 127, 1 octet
 * (byte) is used to store the "short form" length. The 8th bit has a value of
 * 0 indicating the length is "short form" and not "long form" and bits 7-1
 * give the length of the data. (The 8th bit is the left-most, most significant
 * bit: also known as big endian or network format).
 *
 * In the case that the length of the ASN.1 value is greater than 127, 2 to
 * 127 octets (bytes) are used to store the "long form" length. The first
 * byte's 8th bit is set to 1 to indicate the length is "long form." Bits 7-1
 * give the number of additional octets. All following octets are in base 256
 * with the most significant digit first (typical big-endian binary unsigned
 * integer storage). So, for instance, if the length of a value was 257, the
 * first byte would be set to:
 *
 * 10000010 = 130 = 0x82.
 *
 * This indicates there are 2 octets (base 256) for the length. The second and
 * third bytes (the octets just mentioned) would store the length in base 256:
 *
 * octet 2: 00000001 = 1 * 256^1 = 256
 * octet 3: 00000001 = 1 * 256^0 = 1
 * total = 257
 *
 * The algorithm for converting a js integer value of 257 to base-256 is:
 *
 * var value = 257;
 * var bytes = [];
 * bytes[0] = (value >>> 8) & 0xFF; // most significant byte first
 * bytes[1] = value & 0xFF;        // least significant byte last
 *
 * On the ASN.1 UNIVERSAL Object Identifier (OID) type:
 *
 * An OID can be written like: "value1.value2.value3...valueN"
 *
 * The DER encoding rules:
 *
 * The first byte has the value 40 * value1 + value2.
 * The following bytes, if any, encode the remaining values. Each value is
 * encoded in base 128, most significant digit first (big endian), with as
 * few digits as possible, and the most significant bit of each byte set
 * to 1 except the last in each value's encoding. For example: Given the
 * OID "1.2.840.113549", its DER encoding is (remember each byte except the
 * last one in each encoding is OR'd with 0x80):
 *
 * byte 1: 40 * 1 + 2 = 42 = 0x2A.
 * bytes 2-3: 128 * 6 + 72 = 840 = 6 72 = 6 72 = 0x0648 = 0x8648
 * bytes 4-6: 16384 * 6 + 128 * 119 + 13 = 6 119 13 = 0x06770D = 0x86F70D
 *
 * The final value is: 0x2A864886F70D.
 * The full OID (including ASN.1 tag and length of 6 bytes) is:
 * 0x06062A864886F70D
 */
(function() {
/* ########## Begin module implementation ########## */
function initModule(forge) {

/* ASN.1 API */
var asn1 = forge.asn1 = forge.asn1 || {};

/**
 * ASN.1 classes.
 */
asn1.Class = {
  UNIVERSAL:        0x00,
  APPLICATION:      0x40,
  CONTEXT_SPECIFIC: 0x80,
  PRIVATE:          0xC0
};

/**
 * ASN.1 types. Not all types are supported by this implementation, only
 * those necessary to implement a simple PKI are implemented.
 */
asn1.Type = {
  NONE:             0,
  BOOLEAN:          1,
  INTEGER:          2,
  BITSTRING:        3,
  OCTETSTRING:      4,
  NULL:             5,
  OID:              6,
  ODESC:            7,
  EXTERNAL:         8,
  REAL:             9,
  ENUMERATED:      10,
  EMBEDDED:        11,
  UTF8:            12,
  ROID:            13,
  SEQUENCE:        16,
  SET:             17,
  PRINTABLESTRING: 19,
  IA5STRING:       22,
  UTCTIME:         23,
  GENERALIZEDTIME: 24,
  BMPSTRING:       30
};

/**
 * Creates a new asn1 object.
 *
 * @param tagClass the tag class for the object.
 * @param type the data type (tag number) for the object.
 * @param constructed true if the asn1 object is in constructed form.
 * @param value the value for the object, if it is not constructed.
 *
 * @return the asn1 object.
 */
asn1.create = function(tagClass, type, constructed, value) {
  /* An asn1 object has a tagClass, a type, a constructed flag, and a
    value. The value's type depends on the constructed flag. If
    constructed, it will contain a list of other asn1 objects. If not,
    it will contain the ASN.1 value as an array of bytes formatted
    according to the ASN.1 data type. */

  // remove undefined values
  if(forge.util.isArray(value)) {
    var tmp = [];
    for(var i = 0; i < value.length; ++i) {
      if(value[i] !== undefined) {
        tmp.push(value[i]);
      }
    }
    value = tmp;
  }

  return {
    tagClass: tagClass,
    type: type,
    constructed: constructed,
    composed: constructed || forge.util.isArray(value),
    value: value
  };
};

/**
 * Gets the length of a BER-encoded ASN.1 value.
 *
 * In case the length is not specified, undefined is returned.
 *
 * @param b the BER-encoded ASN.1 byte buffer, starting with the first
 *          length byte.
 *
 * @return the length of the BER-encoded ASN.1 value or undefined.
 */
var _getValueLength = asn1.getBerValueLength = function(b) {
  // TODO: move this function and related DER/BER functions to a der.js
  // file; better abstract ASN.1 away from der/ber.
  var b2 = b.getByte();
  if(b2 === 0x80) {
    return undefined;
  }

  // see if the length is "short form" or "long form" (bit 8 set)
  var length;
  var longForm = b2 & 0x80;
  if(!longForm) {
    // length is just the first byte
    length = b2;
  } else {
    // the number of bytes the length is specified in bits 7 through 1
    // and each length byte is in big-endian base-256
    length = b.getInt((b2 & 0x7F) << 3);
  }
  return length;
};

/**
 * Parses an asn1 object from a byte buffer in DER format.
 *
 * @param bytes the byte buffer to parse from.
 * @param strict true to be strict when checking value lengths, false to
 *          allow truncated values (default: true).
 *
 * @return the parsed asn1 object.
 */
asn1.fromDer = function(bytes, strict) {
  if(strict === undefined) {
    strict = true;
  }

  // wrap in buffer if needed
  if(typeof bytes === 'string') {
    bytes = forge.util.createBuffer(bytes);
  }

  // minimum length for ASN.1 DER structure is 2
  if(bytes.length() < 2) {
    var error = new Error('Too few bytes to parse DER.');
    error.bytes = bytes.length();
    throw error;
  }

  // get the first byte
  var b1 = bytes.getByte();

  // get the tag class
  var tagClass = (b1 & 0xC0);

  // get the type (bits 1-5)
  var type = b1 & 0x1F;

  // get the value length
  var length = _getValueLength(bytes);

  // ensure there are enough bytes to get the value
  if(bytes.length() < length) {
    if(strict) {
      var error = new Error('Too few bytes to read ASN.1 value.');
      error.detail = bytes.length() + ' < ' + length;
      throw error;
    }
    // Note: be lenient with truncated values
    length = bytes.length();
  }

  // prepare to get value
  var value;

  // constructed flag is bit 6 (32 = 0x20) of the first byte
  var constructed = ((b1 & 0x20) === 0x20);

  // determine if the value is composed of other ASN.1 objects (if its
  // constructed it will be and if its a BITSTRING it may be)
  var composed = constructed;
  if(!composed && tagClass === asn1.Class.UNIVERSAL &&
    type === asn1.Type.BITSTRING && length > 1) {
    /* The first octet gives the number of bits by which the length of the
      bit string is less than the next multiple of eight (this is called
      the "number of unused bits").

      The second and following octets give the value of the bit string
      converted to an octet string. */
    // if there are no unused bits, maybe the bitstring holds ASN.1 objs
    var read = bytes.read;
    var unused = bytes.getByte();
    if(unused === 0) {
      // if the first byte indicates UNIVERSAL or CONTEXT_SPECIFIC,
      // and the length is valid, assume we've got an ASN.1 object
      b1 = bytes.getByte();
      var tc = (b1 & 0xC0);
      if(tc === asn1.Class.UNIVERSAL || tc === asn1.Class.CONTEXT_SPECIFIC) {
        try {
          var len = _getValueLength(bytes);
          composed = (len === length - (bytes.read - read));
          if(composed) {
            // adjust read/length to account for unused bits byte
            ++read;
            --length;
          }
        } catch(ex) {}
      }
    }
    // restore read pointer
    bytes.read = read;
  }

  if(composed) {
    // parse child asn1 objects from the value
    value = [];
    if(length === undefined) {
      // asn1 object of indefinite length, read until end tag
      for(;;) {
        if(bytes.bytes(2) === String.fromCharCode(0, 0)) {
          bytes.getBytes(2);
          break;
        }
        value.push(asn1.fromDer(bytes, strict));
      }
    } else {
      // parsing asn1 object of definite length
      var start = bytes.length();
      while(length > 0) {
        value.push(asn1.fromDer(bytes, strict));
        length -= start - bytes.length();
        start = bytes.length();
      }
    }
  } else {
    // asn1 not composed, get raw value
    // TODO: do DER to OID conversion and vice-versa in .toDer?

    if(length === undefined) {
      if(strict) {
        throw new Error('Non-constructed ASN.1 object of indefinite length.');
      }
      // be lenient and use remaining bytes
      length = bytes.length();
    }

    if(type === asn1.Type.BMPSTRING) {
      value = '';
      for(var i = 0; i < length; i += 2) {
        value += String.fromCharCode(bytes.getInt16());
      }
    } else {
      value = bytes.getBytes(length);
    }
  }

  // create and return asn1 object
  return asn1.create(tagClass, type, constructed, value);
};

/**
 * Converts the given asn1 object to a buffer of bytes in DER format.
 *
 * @param asn1 the asn1 object to convert to bytes.
 *
 * @return the buffer of bytes.
 */
asn1.toDer = function(obj) {
  var bytes = forge.util.createBuffer();

  // build the first byte
  var b1 = obj.tagClass | obj.type;

  // for storing the ASN.1 value
  var value = forge.util.createBuffer();

  // if composed, use each child asn1 object's DER bytes as value
  if(obj.composed) {
    // turn on 6th bit (0x20 = 32) to indicate asn1 is constructed
    // from other asn1 objects
    if(obj.constructed) {
      b1 |= 0x20;
    } else {
      // type is a bit string, add unused bits of 0x00
      value.putByte(0x00);
    }

    // add all of the child DER bytes together
    for(var i = 0; i < obj.value.length; ++i) {
      if(obj.value[i] !== undefined) {
        value.putBuffer(asn1.toDer(obj.value[i]));
      }
    }
  } else {
    // use asn1.value directly
    if(obj.type === asn1.Type.BMPSTRING) {
      for(var i = 0; i < obj.value.length; ++i) {
        value.putInt16(obj.value.charCodeAt(i));
      }
    } else {
      // ensure integer is minimally-encoded
      if(obj.type === asn1.Type.INTEGER &&
        obj.value.length > 1 &&
        // leading 0x00 for positive integer
        ((obj.value.charCodeAt(0) === 0 &&
        (obj.value.charCodeAt(1) & 0x80) === 0) ||
        // leading 0xFF for negative integer
        (obj.value.charCodeAt(0) === 0xFF &&
        (obj.value.charCodeAt(1) & 0x80) === 0x80))) {
        value.putBytes(obj.value.substr(1));
      } else {
        value.putBytes(obj.value);
      }
    }
  }

  // add tag byte
  bytes.putByte(b1);

  // use "short form" encoding
  if(value.length() <= 127) {
    // one byte describes the length
    // bit 8 = 0 and bits 7-1 = length
    bytes.putByte(value.length() & 0x7F);
  } else {
    // use "long form" encoding
    // 2 to 127 bytes describe the length
    // first byte: bit 8 = 1 and bits 7-1 = # of additional bytes
    // other bytes: length in base 256, big-endian
    var len = value.length();
    var lenBytes = '';
    do {
      lenBytes += String.fromCharCode(len & 0xFF);
      len = len >>> 8;
    } while(len > 0);

    // set first byte to # bytes used to store the length and turn on
    // bit 8 to indicate long-form length is used
    bytes.putByte(lenBytes.length | 0x80);

    // concatenate length bytes in reverse since they were generated
    // little endian and we need big endian
    for(var i = lenBytes.length - 1; i >= 0; --i) {
      bytes.putByte(lenBytes.charCodeAt(i));
    }
  }

  // concatenate value bytes
  bytes.putBuffer(value);
  return bytes;
};

/**
 * Converts an OID dot-separated string to a byte buffer. The byte buffer
 * contains only the DER-encoded value, not any tag or length bytes.
 *
 * @param oid the OID dot-separated string.
 *
 * @return the byte buffer.
 */
asn1.oidToDer = function(oid) {
  // split OID into individual values
  var values = oid.split('.');
  var bytes = forge.util.createBuffer();

  // first byte is 40 * value1 + value2
  bytes.putByte(40 * parseInt(values[0], 10) + parseInt(values[1], 10));
  // other bytes are each value in base 128 with 8th bit set except for
  // the last byte for each value
  var last, valueBytes, value, b;
  for(var i = 2; i < values.length; ++i) {
    // produce value bytes in reverse because we don't know how many
    // bytes it will take to store the value
    last = true;
    valueBytes = [];
    value = parseInt(values[i], 10);
    do {
      b = value & 0x7F;
      value = value >>> 7;
      // if value is not last, then turn on 8th bit
      if(!last) {
        b |= 0x80;
      }
      valueBytes.push(b);
      last = false;
    } while(value > 0);

    // add value bytes in reverse (needs to be in big endian)
    for(var n = valueBytes.length - 1; n >= 0; --n) {
      bytes.putByte(valueBytes[n]);
    }
  }

  return bytes;
};

/**
 * Converts a DER-encoded byte buffer to an OID dot-separated string. The
 * byte buffer should contain only the DER-encoded value, not any tag or
 * length bytes.
 *
 * @param bytes the byte buffer.
 *
 * @return the OID dot-separated string.
 */
asn1.derToOid = function(bytes) {
  var oid;

  // wrap in buffer if needed
  if(typeof bytes === 'string') {
    bytes = forge.util.createBuffer(bytes);
  }

  // first byte is 40 * value1 + value2
  var b = bytes.getByte();
  oid = Math.floor(b / 40) + '.' + (b % 40);

  // other bytes are each value in base 128 with 8th bit set except for
  // the last byte for each value
  var value = 0;
  while(bytes.length() > 0) {
    b = bytes.getByte();
    value = value << 7;
    // not the last byte for the value
    if(b & 0x80) {
      value += b & 0x7F;
    } else {
      // last byte
      oid += '.' + (value + b);
      value = 0;
    }
  }

  return oid;
};

/**
 * Converts a UTCTime value to a date.
 *
 * Note: GeneralizedTime has 4 digits for the year and is used for X.509
 * dates passed 2049. Parsing that structure hasn't been implemented yet.
 *
 * @param utc the UTCTime value to convert.
 *
 * @return the date.
 */
asn1.utcTimeToDate = function(utc) {
  /* The following formats can be used:

    YYMMDDhhmmZ
    YYMMDDhhmm+hh'mm'
    YYMMDDhhmm-hh'mm'
    YYMMDDhhmmssZ
    YYMMDDhhmmss+hh'mm'
    YYMMDDhhmmss-hh'mm'

    Where:

    YY is the least significant two digits of the year
    MM is the month (01 to 12)
    DD is the day (01 to 31)
    hh is the hour (00 to 23)
    mm are the minutes (00 to 59)
    ss are the seconds (00 to 59)
    Z indicates that local time is GMT, + indicates that local time is
    later than GMT, and - indicates that local time is earlier than GMT
    hh' is the absolute value of the offset from GMT in hours
    mm' is the absolute value of the offset from GMT in minutes */
  var date = new Date();

  // if YY >= 50 use 19xx, if YY < 50 use 20xx
  var year = parseInt(utc.substr(0, 2), 10);
  year = (year >= 50) ? 1900 + year : 2000 + year;
  var MM = parseInt(utc.substr(2, 2), 10) - 1; // use 0-11 for month
  var DD = parseInt(utc.substr(4, 2), 10);
  var hh = parseInt(utc.substr(6, 2), 10);
  var mm = parseInt(utc.substr(8, 2), 10);
  var ss = 0;

  // not just YYMMDDhhmmZ
  if(utc.length > 11) {
    // get character after minutes
    var c = utc.charAt(10);
    var end = 10;

    // see if seconds are present
    if(c !== '+' && c !== '-') {
      // get seconds
      ss = parseInt(utc.substr(10, 2), 10);
      end += 2;
    }
  }

  // update date
  date.setUTCFullYear(year, MM, DD);
  date.setUTCHours(hh, mm, ss, 0);

  if(end) {
    // get +/- after end of time
    c = utc.charAt(end);
    if(c === '+' || c === '-') {
      // get hours+minutes offset
      var hhoffset = parseInt(utc.substr(end + 1, 2), 10);
      var mmoffset = parseInt(utc.substr(end + 4, 2), 10);

      // calculate offset in milliseconds
      var offset = hhoffset * 60 + mmoffset;
      offset *= 60000;

      // apply offset
      if(c === '+') {
        date.setTime(+date - offset);
      } else {
        date.setTime(+date + offset);
      }
    }
  }

  return date;
};

/**
 * Converts a GeneralizedTime value to a date.
 *
 * @param gentime the GeneralizedTime value to convert.
 *
 * @return the date.
 */
asn1.generalizedTimeToDate = function(gentime) {
  /* The following formats can be used:

    YYYYMMDDHHMMSS
    YYYYMMDDHHMMSS.fff
    YYYYMMDDHHMMSSZ
    YYYYMMDDHHMMSS.fffZ
    YYYYMMDDHHMMSS+hh'mm'
    YYYYMMDDHHMMSS.fff+hh'mm'
    YYYYMMDDHHMMSS-hh'mm'
    YYYYMMDDHHMMSS.fff-hh'mm'

    Where:

    YYYY is the year
    MM is the month (01 to 12)
    DD is the day (01 to 31)
    hh is the hour (00 to 23)
    mm are the minutes (00 to 59)
    ss are the seconds (00 to 59)
    .fff is the second fraction, accurate to three decimal places
    Z indicates that local time is GMT, + indicates that local time is
    later than GMT, and - indicates that local time is earlier than GMT
    hh' is the absolute value of the offset from GMT in hours
    mm' is the absolute value of the offset from GMT in minutes */
  var date = new Date();

  var YYYY = parseInt(gentime.substr(0, 4), 10);
  var MM = parseInt(gentime.substr(4, 2), 10) - 1; // use 0-11 for month
  var DD = parseInt(gentime.substr(6, 2), 10);
  var hh = parseInt(gentime.substr(8, 2), 10);
  var mm = parseInt(gentime.substr(10, 2), 10);
  var ss = parseInt(gentime.substr(12, 2), 10);
  var fff = 0;
  var offset = 0;
  var isUTC = false;

  if(gentime.charAt(gentime.length - 1) === 'Z') {
    isUTC = true;
  }

  var end = gentime.length - 5, c = gentime.charAt(end);
  if(c === '+' || c === '-') {
    // get hours+minutes offset
    var hhoffset = parseInt(gentime.substr(end + 1, 2), 10);
    var mmoffset = parseInt(gentime.substr(end + 4, 2), 10);

    // calculate offset in milliseconds
    offset = hhoffset * 60 + mmoffset;
    offset *= 60000;

    // apply offset
    if(c === '+') {
      offset *= -1;
    }

    isUTC = true;
  }

  // check for second fraction
  if(gentime.charAt(14) === '.') {
    fff = parseFloat(gentime.substr(14), 10) * 1000;
  }

  if(isUTC) {
    date.setUTCFullYear(YYYY, MM, DD);
    date.setUTCHours(hh, mm, ss, fff);

    // apply offset
    date.setTime(+date + offset);
  } else {
    date.setFullYear(YYYY, MM, DD);
    date.setHours(hh, mm, ss, fff);
  }

  return date;
};

/**
 * Converts a date to a UTCTime value.
 *
 * Note: GeneralizedTime has 4 digits for the year and is used for X.509
 * dates passed 2049. Converting to a GeneralizedTime hasn't been
 * implemented yet.
 *
 * @param date the date to convert.
 *
 * @return the UTCTime value.
 */
asn1.dateToUtcTime = function(date) {
  // TODO: validate; currently assumes proper format
  if(typeof date === 'string') {
    return date;
  }

  var rval = '';

  // create format YYMMDDhhmmssZ
  var format = [];
  format.push(('' + date.getUTCFullYear()).substr(2));
  format.push('' + (date.getUTCMonth() + 1));
  format.push('' + date.getUTCDate());
  format.push('' + date.getUTCHours());
  format.push('' + date.getUTCMinutes());
  format.push('' + date.getUTCSeconds());

  // ensure 2 digits are used for each format entry
  for(var i = 0; i < format.length; ++i) {
    if(format[i].length < 2) {
      rval += '0';
    }
    rval += format[i];
  }
  rval += 'Z';

  return rval;
};

/**
 * Converts a date to a GeneralizedTime value.
 *
 * @param date the date to convert.
 *
 * @return the GeneralizedTime value as a string.
 */
asn1.dateToGeneralizedTime = function(date) {
  // TODO: validate; currently assumes proper format
  if(typeof date === 'string') {
    return date;
  }

  var rval = '';

  // create format YYYYMMDDHHMMSSZ
  var format = [];
  format.push('' + date.getUTCFullYear());
  format.push('' + (date.getUTCMonth() + 1));
  format.push('' + date.getUTCDate());
  format.push('' + date.getUTCHours());
  format.push('' + date.getUTCMinutes());
  format.push('' + date.getUTCSeconds());

  // ensure 2 digits are used for each format entry
  for(var i = 0; i < format.length; ++i) {
    if(format[i].length < 2) {
      rval += '0';
    }
    rval += format[i];
  }
  rval += 'Z';

  return rval;
};

/**
 * Converts a javascript integer to a DER-encoded byte buffer to be used
 * as the value for an INTEGER type.
 *
 * @param x the integer.
 *
 * @return the byte buffer.
 */
asn1.integerToDer = function(x) {
  var rval = forge.util.createBuffer();
  if(x >= -0x80 && x < 0x80) {
    return rval.putSignedInt(x, 8);
  }
  if(x >= -0x8000 && x < 0x8000) {
    return rval.putSignedInt(x, 16);
  }
  if(x >= -0x800000 && x < 0x800000) {
    return rval.putSignedInt(x, 24);
  }
  if(x >= -0x80000000 && x < 0x80000000) {
    return rval.putSignedInt(x, 32);
  }
  var error = new Error('Integer too large; max is 32-bits.');
  error.integer = x;
  throw error;
};

/**
 * Converts a DER-encoded byte buffer to a javascript integer. This is
 * typically used to decode the value of an INTEGER type.
 *
 * @param bytes the byte buffer.
 *
 * @return the integer.
 */
asn1.derToInteger = function(bytes) {
  // wrap in buffer if needed
  if(typeof bytes === 'string') {
    bytes = forge.util.createBuffer(bytes);
  }

  var n = bytes.length() * 8;
  if(n > 32) {
    throw new Error('Integer too large; max is 32-bits.');
  }
  return bytes.getSignedInt(n);
};

/**
 * Validates the that given ASN.1 object is at least a super set of the
 * given ASN.1 structure. Only tag classes and types are checked. An
 * optional map may also be provided to capture ASN.1 values while the
 * structure is checked.
 *
 * To capture an ASN.1 value, set an object in the validator's 'capture'
 * parameter to the key to use in the capture map. To capture the full
 * ASN.1 object, specify 'captureAsn1'.
 *
 * Objects in the validator may set a field 'optional' to true to indicate
 * that it isn't necessary to pass validation.
 *
 * @param obj the ASN.1 object to validate.
 * @param v the ASN.1 structure validator.
 * @param capture an optional map to capture values in.
 * @param errors an optional array for storing validation errors.
 *
 * @return true on success, false on failure.
 */
asn1.validate = function(obj, v, capture, errors) {
  var rval = false;

  // ensure tag class and type are the same if specified
  if((obj.tagClass === v.tagClass || typeof(v.tagClass) === 'undefined') &&
    (obj.type === v.type || typeof(v.type) === 'undefined')) {
    // ensure constructed flag is the same if specified
    if(obj.constructed === v.constructed ||
      typeof(v.constructed) === 'undefined') {
      rval = true;

      // handle sub values
      if(v.value && forge.util.isArray(v.value)) {
        var j = 0;
        for(var i = 0; rval && i < v.value.length; ++i) {
          rval = v.value[i].optional || false;
          if(obj.value[j]) {
            rval = asn1.validate(obj.value[j], v.value[i], capture, errors);
            if(rval) {
              ++j;
            } else if(v.value[i].optional) {
              rval = true;
            }
          }
          if(!rval && errors) {
            errors.push(
              '[' + v.name + '] ' +
              'Tag class "' + v.tagClass + '", type "' +
              v.type + '" expected value length "' +
              v.value.length + '", got "' +
              obj.value.length + '"');
          }
        }
      }

      if(rval && capture) {
        if(v.capture) {
          capture[v.capture] = obj.value;
        }
        if(v.captureAsn1) {
          capture[v.captureAsn1] = obj;
        }
      }
    } else if(errors) {
      errors.push(
        '[' + v.name + '] ' +
        'Expected constructed "' + v.constructed + '", got "' +
        obj.constructed + '"');
    }
  } else if(errors) {
    if(obj.tagClass !== v.tagClass) {
      errors.push(
        '[' + v.name + '] ' +
        'Expected tag class "' + v.tagClass + '", got "' +
        obj.tagClass + '"');
    }
    if(obj.type !== v.type) {
      errors.push(
        '[' + v.name + '] ' +
        'Expected type "' + v.type + '", got "' + obj.type + '"');
    }
  }
  return rval;
};

// regex for testing for non-latin characters
var _nonLatinRegex = /[^\\u0000-\\u00ff]/;

/**
 * Pretty prints an ASN.1 object to a string.
 *
 * @param obj the object to write out.
 * @param level the level in the tree.
 * @param indentation the indentation to use.
 *
 * @return the string.
 */
asn1.prettyPrint = function(obj, level, indentation) {
  var rval = '';

  // set default level and indentation
  level = level || 0;
  indentation = indentation || 2;

  // start new line for deep levels
  if(level > 0) {
    rval += '\n';
  }

  // create indent
  var indent = '';
  for(var i = 0; i < level * indentation; ++i) {
    indent += ' ';
  }

  // print class:type
  rval += indent + 'Tag: ';
  switch(obj.tagClass) {
  case asn1.Class.UNIVERSAL:
    rval += 'Universal:';
    break;
  case asn1.Class.APPLICATION:
    rval += 'Application:';
    break;
  case asn1.Class.CONTEXT_SPECIFIC:
    rval += 'Context-Specific:';
    break;
  case asn1.Class.PRIVATE:
    rval += 'Private:';
    break;
  }

  if(obj.tagClass === asn1.Class.UNIVERSAL) {
    rval += obj.type;

    // known types
    switch(obj.type) {
    case asn1.Type.NONE:
      rval += ' (None)';
      break;
    case asn1.Type.BOOLEAN:
      rval += ' (Boolean)';
      break;
    case asn1.Type.BITSTRING:
      rval += ' (Bit string)';
      break;
    case asn1.Type.INTEGER:
      rval += ' (Integer)';
      break;
    case asn1.Type.OCTETSTRING:
      rval += ' (Octet string)';
      break;
    case asn1.Type.NULL:
      rval += ' (Null)';
      break;
    case asn1.Type.OID:
      rval += ' (Object Identifier)';
      break;
    case asn1.Type.ODESC:
      rval += ' (Object Descriptor)';
      break;
    case asn1.Type.EXTERNAL:
      rval += ' (External or Instance of)';
      break;
    case asn1.Type.REAL:
      rval += ' (Real)';
      break;
    case asn1.Type.ENUMERATED:
      rval += ' (Enumerated)';
      break;
    case asn1.Type.EMBEDDED:
      rval += ' (Embedded PDV)';
      break;
    case asn1.Type.UTF8:
      rval += ' (UTF8)';
      break;
    case asn1.Type.ROID:
      rval += ' (Relative Object Identifier)';
      break;
    case asn1.Type.SEQUENCE:
      rval += ' (Sequence)';
      break;
    case asn1.Type.SET:
      rval += ' (Set)';
      break;
    case asn1.Type.PRINTABLESTRING:
      rval += ' (Printable String)';
      break;
    case asn1.Type.IA5String:
      rval += ' (IA5String (ASCII))';
      break;
    case asn1.Type.UTCTIME:
      rval += ' (UTC time)';
      break;
    case asn1.Type.GENERALIZEDTIME:
      rval += ' (Generalized time)';
      break;
    case asn1.Type.BMPSTRING:
      rval += ' (BMP String)';
      break;
    }
  } else {
    rval += obj.type;
  }

  rval += '\n';
  rval += indent + 'Constructed: ' + obj.constructed + '\n';

  if(obj.composed) {
    var subvalues = 0;
    var sub = '';
    for(var i = 0; i < obj.value.length; ++i) {
      if(obj.value[i] !== undefined) {
        subvalues += 1;
        sub += asn1.prettyPrint(obj.value[i], level + 1, indentation);
        if((i + 1) < obj.value.length) {
          sub += ',';
        }
      }
    }
    rval += indent + 'Sub values: ' + subvalues + sub;
  } else {
    rval += indent + 'Value: ';
    if(obj.type === asn1.Type.OID) {
      var oid = asn1.derToOid(obj.value);
      rval += oid;
      if(forge.pki && forge.pki.oids) {
        if(oid in forge.pki.oids) {
          rval += ' (' + forge.pki.oids[oid] + ') ';
        }
      }
    }
    if(obj.type === asn1.Type.INTEGER) {
      try {
        rval += asn1.derToInteger(obj.value);
      } catch(ex) {
        rval += '0x' + forge.util.bytesToHex(obj.value);
      }
    } else if(obj.type === asn1.Type.OCTETSTRING) {
      if(!_nonLatinRegex.test(obj.value)) {
        rval += '(' + obj.value + ') ';
      }
      rval += '0x' + forge.util.bytesToHex(obj.value);
    } else if(obj.type === asn1.Type.UTF8) {
      rval += forge.util.decodeUtf8(obj.value);
    } else if(obj.type === asn1.Type.PRINTABLESTRING ||
      obj.type === asn1.Type.IA5String) {
      rval += obj.value;
    } else if(_nonLatinRegex.test(obj.value)) {
      rval += '0x' + forge.util.bytesToHex(obj.value);
    } else if(obj.value.length === 0) {
      rval += '[null]';
    } else {
      rval += obj.value;
    }
  }

  return rval;
};

} // end module implementation

/* ########## Begin module wrapper ########## */
var name = 'asn1';
if(typeof define !== 'function') {
  // NodeJS -> AMD
  if(typeof module === 'object' && module.exports) {
    var nodeJS = true;
    define = function(ids, factory) {
      factory(require, module);
    };
  } else {
    // <script>
    if(typeof forge === 'undefined') {
      forge = {};
    }
    return initModule(forge);
  }
}
// AMD
var deps;
var defineFunc = function(require, module) {
  module.exports = function(forge) {
    var mods = deps.map(function(dep) {
      return require(dep);
    }).concat(initModule);
    // handle circular dependencies
    forge = forge || {};
    forge.defined = forge.defined || {};
    if(forge.defined[name]) {
      return forge[name];
    }
    forge.defined[name] = true;
    for(var i = 0; i < mods.length; ++i) {
      mods[i](forge);
    }
    return forge[name];
  };
};
var tmpDefine = define;
define = function(ids, factory) {
  deps = (typeof ids === 'string') ? factory.slice(2) : ids.slice(2);
  if(nodeJS) {
    delete define;
    return tmpDefine.apply(null, Array.prototype.slice.call(arguments, 0));
  }
  define = tmpDefine;
  return define.apply(null, Array.prototype.slice.call(arguments, 0));
};
define(['require', 'module', './util', './oids'], function() {
  defineFunc.apply(null, Array.prototype.slice.call(arguments, 0));
});
})();
