205 lines
12 KiB
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205 lines
12 KiB
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<title>JSDoc: Source: packet/openpgp.packet.encryptedintegrityprotecteddata.js</title>
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<h1 class="page-title">Source: packet/openpgp.packet.encryptedintegrityprotecteddata.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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/**
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* @class
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* @classdesc Implementation of the Sym. Encrypted Integrity Protected Data
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* Packet (Tag 18)
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*
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* RFC4880 5.13: The Symmetrically Encrypted Integrity Protected Data packet is
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* a variant of the Symmetrically Encrypted Data packet. It is a new feature
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* created for OpenPGP that addresses the problem of detecting a modification to
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* encrypted data. It is used in combination with a Modification Detection Code
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* packet.
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*/
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function openpgp_packet_encryptedintegrityprotecteddata() {
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this.tagType = 18;
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this.version = null; // integer == 1
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this.packetLength = null; // integer
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this.encryptedData = null; // string
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this.decrytpedData = null; // string
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this.hash = null; // string
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/**
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* Parsing function for the packet.
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*
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* @param {String} input Payload of a tag 18 packet
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* @param {Integer} position
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* position to start reading from the input string
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* @param {Integer} len Length of the packet or the remaining length of
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* input at position
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* @return {openpgp_packet_encryptedintegrityprotecteddata} object
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* representation
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*/
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function read_packet(input, position, len) {
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this.packetLength = len;
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// - A one-octet version number. The only currently defined value is
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// 1.
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this.version = input[position].charCodeAt();
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if (this.version != 1) {
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util
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.print_error('openpgp.packet.encryptedintegrityprotecteddata.js\nunknown encrypted integrity protected data packet version: '
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+ this.version
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+ " , @ "
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+ position
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+ "hex:"
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+ util.hexstrdump(input));
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return null;
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}
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// - Encrypted data, the output of the selected symmetric-key cipher
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// operating in Cipher Feedback mode with shift amount equal to the
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// block size of the cipher (CFB-n where n is the block size).
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this.encryptedData = input.substring(position + 1, position + 1 + len);
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util.print_debug("openpgp.packet.encryptedintegrityprotecteddata.js\n"
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+ this.toString());
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return this;
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}
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/**
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* Creates a string representation of a Sym. Encrypted Integrity Protected
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* Data Packet (tag 18) (see RFC4880 5.13)
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*
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* @param {Integer} symmetric_algorithm
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* The selected symmetric encryption algorithm to be used
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* @param {String} key The key of cipher blocksize length to be used
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* @param {String} data
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* Plaintext data to be encrypted within the packet
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* @return {String} A string representation of the packet
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*/
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function write_packet(symmetric_algorithm, key, data) {
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var prefixrandom = openpgp_crypto_getPrefixRandom(symmetric_algorithm);
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var prefix = prefixrandom
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+ prefixrandom.charAt(prefixrandom.length - 2)
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+ prefixrandom.charAt(prefixrandom.length - 1);
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var tohash = data;
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tohash += String.fromCharCode(0xD3);
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tohash += String.fromCharCode(0x14);
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util.print_debug_hexstr_dump("data to be hashed:"
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, prefix + tohash);
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tohash += str_sha1(prefix + tohash);
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util.print_debug_hexstr_dump("hash:"
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, tohash.substring(tohash.length - 20,
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tohash.length));
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var result = openpgp_crypto_symmetricEncrypt(prefixrandom,
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symmetric_algorithm, key, tohash, false).substring(0,
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prefix.length + tohash.length);
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var header = openpgp_packet.write_packet_header(18, result.length + 1)
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+ String.fromCharCode(1);
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this.encryptedData = result;
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return header + result;
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}
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/**
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* Decrypts the encrypted data contained in this object read_packet must
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* have been called before
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*
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* @param {Integer} symmetric_algorithm_type
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* The selected symmetric encryption algorithm to be used
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* @param {String} key The key of cipher blocksize length to be used
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* @return {String} The decrypted data of this packet
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*/
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function decrypt(symmetric_algorithm_type, key) {
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this.decryptedData = openpgp_crypto_symmetricDecrypt(
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symmetric_algorithm_type, key, this.encryptedData, false);
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// there must be a modification detection code packet as the
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// last packet and everything gets hashed except the hash itself
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this.hash = str_sha1(openpgp_crypto_MDCSystemBytes(
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symmetric_algorithm_type, key, this.encryptedData)
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+ this.decryptedData.substring(0,
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this.decryptedData.length - 20));
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util.print_debug_hexstr_dump("calc hash = ", this.hash);
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if (this.hash == this.decryptedData.substring(
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this.decryptedData.length - 20, this.decryptedData.length))
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return this.decryptedData;
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else
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util
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.print_error("Decryption stopped: discovered a modification of encrypted data.");
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return null;
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}
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function toString() {
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var data = '';
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if(openpgp.config.debug)
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data = ' data: Bytes ['
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+ util.hexstrdump(this.encryptedData) + ']';
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return '5.13. Sym. Encrypted Integrity Protected Data Packet (Tag 18)\n'
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+ ' length: '
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+ this.packetLength
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+ '\n'
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+ ' version: '
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+ this.version
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+ '\n'
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+ data;
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}
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this.write_packet = write_packet;
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this.read_packet = read_packet;
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this.toString = toString;
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this.decrypt = decrypt;
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};
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</code></pre>
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</article>
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</section>
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<h2><a href="index.html">Index</a></h2><h3>Classes</h3><ul><li><a href="_openpgp_packet.html">_openpgp_packet</a></li><li><a href="JXG.Util.html">Util</a></li><li><a href="openpgp.html">openpgp</a></li><li><a href="openpgp_config.html">openpgp_config</a></li><li><a href="openpgp_keyring.html">openpgp_keyring</a></li><li><a href="openpgp_msg_message.html">openpgp_msg_message</a></li><li><a href="openpgp_msg_privatekey.html">openpgp_msg_privatekey</a></li><li><a href="openpgp_msg_publickey.html">openpgp_msg_publickey</a></li><li><a href="openpgp_packet_compressed.html">openpgp_packet_compressed</a></li><li><a href="openpgp_packet_encrypteddata.html">openpgp_packet_encrypteddata</a></li><li><a href="openpgp_packet_encryptedintegrityprotecteddata.html">openpgp_packet_encryptedintegrityprotecteddata</a></li><li><a href="openpgp_packet_encryptedsessionkey.html">openpgp_packet_encryptedsessionkey</a></li><li><a href="openpgp_packet_keymaterial.html">openpgp_packet_keymaterial</a></li><li><a href="openpgp_packet_literaldata.html">openpgp_packet_literaldata</a></li><li><a href="openpgp_packet_marker.html">openpgp_packet_marker</a></li><li><a href="openpgp_packet_modificationdetectioncode.html">openpgp_packet_modificationdetectioncode</a></li><li><a href="openpgp_packet_onepasssignature.html">openpgp_packet_onepasssignature</a></li><li><a href="openpgp_packet_signature.html">openpgp_packet_signature</a></li><li><a href="openpgp_packet_userattribute.html">openpgp_packet_userattribute</a></li><li><a href="openpgp_packet_userid.html">openpgp_packet_userid</a></li><li><a href="openpgp_type_keyid.html">openpgp_type_keyid</a></li><li><a href="openpgp_type_mpi.html">openpgp_type_mpi</a></li><li><a href="openpgp_type_s2k.html">openpgp_type_s2k</a></li></ul><h3>Global</h3><ul><li><a href="global.html#bin2str">bin2str</a></li><li><a href="global.html#calc_checksum">calc_checksum</a></li><li><a href="global.html#crc_table">crc_table</a></li><li><a href="global.html#get_hashAlgorithmString">get_hashAlgorithmString</a></li><li><a href="global.html#getCheckSum">getCheckSum</a></li><li><a href="global.html#getPGPMessageType">getPGPMessageType</a></li><li><a href="global.html#hash_headers">hash_headers</a></li><li><a href="global.html#hex2bin">hex2bin</a></li><li><a href="global.html#hexidump">hexidump</a></li><li><a href="global.html#hexstrdump">hexstrdump</a></li><li><a href="global.html#MD5">MD5</a></li><li><a href="global.html#openpgp_cfb_decrypt">openpgp_cfb_decrypt</a></li><li><a href="global.html#openpgp_cfb_encrypt">openpgp_cfb_encrypt</a></li><li><a href="global.html#openpgp_cfb_mdc">openpgp_cfb_mdc</a></li><li><a href="global.html#openpgp_crypto_asymetricDecrypt">openpgp_crypto_asymetricDecrypt</a></li><li><a href="global.html#openpgp_crypto_asymetricEncrypt">openpgp_crypto_asymetricEncrypt</a></li><li><a href="global.html#openpgp_crypto_generateKeyPair">openpgp_crypto_generateKeyPair</a></li><li><a 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href="global.html#openpgp_crypto_symmetricDecrypt">openpgp_crypto_symmetricDecrypt</a></li><li><a href="global.html#openpgp_crypto_symmetricEncrypt">openpgp_crypto_symmetricEncrypt</a></li><li><a href="global.html#openpgp_crypto_verifySignature">openpgp_crypto_verifySignature</a></li><li><a href="global.html#openpgp_encoding_armor">openpgp_encoding_armor</a></li><li><a href="global.html#openpgp_encoding_armor_addheader">openpgp_encoding_armor_addheader</a></li><li><a href="global.html#openpgp_encoding_base64_decode">openpgp_encoding_base64_decode</a></li><li><a href="global.html#openpgp_encoding_base64_encode">openpgp_encoding_base64_encode</a></li><li><a href="global.html#openpgp_encoding_deArmor">openpgp_encoding_deArmor</a></li><li><a href="global.html#openpgp_encoding_eme_pkcs1_decode">openpgp_encoding_eme_pkcs1_decode</a></li><li><a href="global.html#openpgp_encoding_eme_pkcs1_encode">openpgp_encoding_eme_pkcs1_encode</a></li><li><a href="global.html#openpgp_encoding_emsa_pkcs1_decode">openpgp_encoding_emsa_pkcs1_decode</a></li><li><a href="global.html#openpgp_encoding_emsa_pkcs1_encode">openpgp_encoding_emsa_pkcs1_encode</a></li><li><a href="global.html#openpgp_encoding_html_encode">openpgp_encoding_html_encode</a></li><li><a href="global.html#print_debug">print_debug</a></li><li><a href="global.html#print_debug_hexstr_dump">print_debug_hexstr_dump</a></li><li><a href="global.html#print_error">print_error</a></li><li><a href="global.html#print_info">print_info</a></li><li><a href="global.html#shiftRight">shiftRight</a></li><li><a href="global.html#str2bin">str2bin</a></li><li><a href="global.html#str2Uint8Array">str2Uint8Array</a></li><li><a href="global.html#Uint8Array2str">Uint8Array2str</a></li><li><a href="global.html#util">util</a></li><li><a href="global.html#verifyCheckSum">verifyCheckSum</a></li></ul>
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