191 lines
12 KiB
HTML
191 lines
12 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<title>JSDoc: Source: encoding/openpgp.encoding.js</title>
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<h1 class="page-title">Source: encoding/openpgp.encoding.js</h1>
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<section>
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<article>
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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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* Wrapper function for the base64 codec.
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* This function encodes a String (message) in base64 (radix-64)
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* @param {String} message The message to encode
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* @return {String} The base64 encoded data
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*/
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function openpgp_encoding_base64_encode(message) {
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return s2r(message);
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}
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/**
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* Wrapper function for the base64 codec.
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* This function decodes a String(message) in base64 (radix-64)
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* @param {String} message Base64 encoded data
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* @return {String} Raw data after decoding
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*/
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function openpgp_encoding_base64_decode(message) {
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return r2s(message);
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}
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/**
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* Wrapper function for jquery library.
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* This function escapes HTML characters within a string. This is used
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* to prevent XSS.
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* @param {String} message Message to escape
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* @return {String} Html encoded string
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*/
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function openpgp_encoding_html_encode(message) {
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if (message == null)
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return "";
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return $('<div/>').text(message).html();
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}
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/**
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* create a EME-PKCS1-v1_5 padding (See RFC4880 13.1.1)
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* @param {String} message message to be padded
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* @param {Integer} length Length to the resulting message
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* @return {String} EME-PKCS1 padded message
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*/
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function openpgp_encoding_eme_pkcs1_encode(message, length) {
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if (message.length > length-11)
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return -1;
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var result = "";
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result += String.fromCharCode(0);
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result += String.fromCharCode(2);
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for (var i = 0; i < length - message.length - 3; i++) {
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result += String.fromCharCode(openpgp_crypto_getPseudoRandom(1,255));
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}
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result += String.fromCharCode(0);
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result += message;
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return result;
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}
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/**
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* decodes a EME-PKCS1-v1_5 padding (See RFC4880 13.1.2)
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* @param {String} message EME-PKCS1 padded message
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* @return {String} decoded message
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*/
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function openpgp_encoding_eme_pkcs1_decode(message, len) {
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if (message.length < len)
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message = String.fromCharCode(0)+message;
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if (message.length < 12 || message.charCodeAt(0) != 0 || message.charCodeAt(1) != 2)
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return -1;
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var i = 2;
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while (message.charCodeAt(i) != 0 && message.length > i)
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i++;
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return message.substring(i+1, message.length);
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}
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/**
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* ASN1 object identifiers for hashes (See RFC4880 5.2.2)
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*/
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hash_headers = new Array();
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hash_headers[1] = [0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0x04,0x10];
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hash_headers[3] = [0x30,0x21,0x30,0x09,0x06,0x05,0x2B,0x24,0x03,0x02,0x01,0x05,0x00,0x04,0x14];
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hash_headers[2] = [0x30,0x21,0x30,0x09,0x06,0x05,0x2b,0x0e,0x03,0x02,0x1a,0x05,0x00,0x04,0x14];
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hash_headers[8] = [0x30,0x31,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x01,0x05,0x00,0x04,0x20];
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hash_headers[9] = [0x30,0x41,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x02,0x05,0x00,0x04,0x30];
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hash_headers[10] = [0x30,0x51,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x03,0x05,0x00,0x04,0x40];
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hash_headers[11] = [0x30,0x31,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x04,0x05,0x00,0x04,0x1C];
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/**
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* create a EMSA-PKCS1-v1_5 padding (See RFC4880 13.1.3)
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* @param {Integer} algo Hash algorithm type used
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* @param {String} data Data to be hashed
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* @param {Integer} keylength Key size of the public mpi in bytes
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* @returns {String} Hashcode with pkcs1padding as string
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*/
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function openpgp_encoding_emsa_pkcs1_encode(algo, data, keylength) {
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var data2 = "";
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data2 += String.fromCharCode(0x00);
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data2 += String.fromCharCode(0x01);
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for (var i = 0; i < (keylength - hash_headers[algo].length - 3 - openpgp_crypto_getHashByteLength(algo)); i++)
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data2 += String.fromCharCode(0xff);
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data2 += String.fromCharCode(0x00);
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for (var i = 0; i < hash_headers[algo].length; i++)
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data2 += String.fromCharCode(hash_headers[algo][i]);
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data2 += openpgp_crypto_hashData(algo, data);
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return new BigInteger(util.hexstrdump(data2),16);
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}
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/**
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* extract the hash out of an EMSA-PKCS1-v1.5 padding (See RFC4880 13.1.3)
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* @param {String} data Hash in pkcs1 encoding
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* @returns {String} The hash as string
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*/
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function openpgp_encoding_emsa_pkcs1_decode(algo, data) {
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var i = 0;
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if (data.charCodeAt(0) == 0) i++;
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else if (data.charCodeAt(0) != 1) return -1;
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else i++;
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while (data.charCodeAt(i) == 0xFF) i++;
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if (data.charCodeAt(i++) != 0) return -1;
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var j = 0;
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for (j = 0; j < hash_headers[algo].length && j+i < data.length; j++) {
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if (data.charCodeAt(j+i) != hash_headers[algo][j]) return -1;
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}
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i+= j;
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if (data.substring(i).length < openpgp_crypto_getHashByteLength(algo)) return -1;
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return data.substring(i);
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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 href="global.html#openpgp_crypto_generateSessionKey">openpgp_crypto_generateSessionKey</a></li><li><a href="global.html#openpgp_crypto_getHashByteLength">openpgp_crypto_getHashByteLength</a></li><li><a href="global.html#openpgp_crypto_getPrefixRandom">openpgp_crypto_getPrefixRandom</a></li><li><a href="global.html#openpgp_crypto_getPseudoRandom">openpgp_crypto_getPseudoRandom</a></li><li><a href="global.html#openpgp_crypto_getRandomBigInteger">openpgp_crypto_getRandomBigInteger</a></li><li><a href="global.html#openpgp_crypto_getRandomBytes">openpgp_crypto_getRandomBytes</a></li><li><a href="global.html#openpgp_crypto_getSecureRandom">openpgp_crypto_getSecureRandom</a></li><li><a href="global.html#openpgp_crypto_hashData">openpgp_crypto_hashData</a></li><li><a href="global.html#openpgp_crypto_MDCSystemBytes">openpgp_crypto_MDCSystemBytes</a></li><li><a href="global.html#openpgp_crypto_signData">openpgp_crypto_signData</a></li><li><a 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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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.0-dev</a> on Fri Apr 12 2013 14:20:33 GMT+0200 (CEST)
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