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authorMinteck <contact@minteck.org>2022-10-18 08:59:09 +0200
committerMinteck <contact@minteck.org>2022-10-18 08:59:09 +0200
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+/**
+ * Javascript implementation of basic PEM (Privacy Enhanced Mail) algorithms.
+ *
+ * See: RFC 1421.
+ *
+ * @author Dave Longley
+ *
+ * Copyright (c) 2013-2014 Digital Bazaar, Inc.
+ *
+ * A Forge PEM object has the following fields:
+ *
+ * type: identifies the type of message (eg: "RSA PRIVATE KEY").
+ *
+ * procType: identifies the type of processing performed on the message,
+ * it has two subfields: version and type, eg: 4,ENCRYPTED.
+ *
+ * contentDomain: identifies the type of content in the message, typically
+ * only uses the value: "RFC822".
+ *
+ * dekInfo: identifies the message encryption algorithm and mode and includes
+ * any parameters for the algorithm, it has two subfields: algorithm and
+ * parameters, eg: DES-CBC,F8143EDE5960C597.
+ *
+ * headers: contains all other PEM encapsulated headers -- where order is
+ * significant (for pairing data like recipient ID + key info).
+ *
+ * body: the binary-encoded body.
+ */
+(function() {
+/* ########## Begin module implementation ########## */
+function initModule(forge) {
+
+// shortcut for pem API
+var pem = forge.pem = forge.pem || {};
+
+/**
+ * Encodes (serializes) the given PEM object.
+ *
+ * @param msg the PEM message object to encode.
+ * @param options the options to use:
+ * maxline the maximum characters per line for the body, (default: 64).
+ *
+ * @return the PEM-formatted string.
+ */
+pem.encode = function(msg, options) {
+ options = options || {};
+ var rval = '-----BEGIN ' + msg.type + '-----\r\n';
+
+ // encode special headers
+ var header;
+ if(msg.procType) {
+ header = {
+ name: 'Proc-Type',
+ values: [String(msg.procType.version), msg.procType.type]
+ };
+ rval += foldHeader(header);
+ }
+ if(msg.contentDomain) {
+ header = {name: 'Content-Domain', values: [msg.contentDomain]};
+ rval += foldHeader(header);
+ }
+ if(msg.dekInfo) {
+ header = {name: 'DEK-Info', values: [msg.dekInfo.algorithm]};
+ if(msg.dekInfo.parameters) {
+ header.values.push(msg.dekInfo.parameters);
+ }
+ rval += foldHeader(header);
+ }
+
+ if(msg.headers) {
+ // encode all other headers
+ for(var i = 0; i < msg.headers.length; ++i) {
+ rval += foldHeader(msg.headers[i]);
+ }
+ }
+
+ // terminate header
+ if(msg.procType) {
+ rval += '\r\n';
+ }
+
+ // add body
+ rval += forge.util.encode64(msg.body, options.maxline || 64) + '\r\n';
+
+ rval += '-----END ' + msg.type + '-----\r\n';
+ return rval;
+};
+
+/**
+ * Decodes (deserializes) all PEM messages found in the given string.
+ *
+ * @param str the PEM-formatted string to decode.
+ *
+ * @return the PEM message objects in an array.
+ */
+pem.decode = function(str) {
+ var rval = [];
+
+ // split string into PEM messages (be lenient w/EOF on BEGIN line)
+ var rMessage = /\s*-----BEGIN ([A-Z0-9- ]+)-----\r?\n?([\x21-\x7e\s]+?(?:\r?\n\r?\n))?([:A-Za-z0-9+\/=\s]+?)-----END \1-----/g;
+ var rHeader = /([\x21-\x7e]+):\s*([\x21-\x7e\s^:]+)/;
+ var rCRLF = /\r?\n/;
+ var match;
+ while(true) {
+ match = rMessage.exec(str);
+ if(!match) {
+ break;
+ }
+
+ var msg = {
+ type: match[1],
+ procType: null,
+ contentDomain: null,
+ dekInfo: null,
+ headers: [],
+ body: forge.util.decode64(match[3])
+ };
+ rval.push(msg);
+
+ // no headers
+ if(!match[2]) {
+ continue;
+ }
+
+ // parse headers
+ var lines = match[2].split(rCRLF);
+ var li = 0;
+ while(match && li < lines.length) {
+ // get line, trim any rhs whitespace
+ var line = lines[li].replace(/\s+$/, '');
+
+ // RFC2822 unfold any following folded lines
+ for(var nl = li + 1; nl < lines.length; ++nl) {
+ var next = lines[nl];
+ if(!/\s/.test(next[0])) {
+ break;
+ }
+ line += next;
+ li = nl;
+ }
+
+ // parse header
+ match = line.match(rHeader);
+ if(match) {
+ var header = {name: match[1], values: []};
+ var values = match[2].split(',');
+ for(var vi = 0; vi < values.length; ++vi) {
+ header.values.push(ltrim(values[vi]));
+ }
+
+ // Proc-Type must be the first header
+ if(!msg.procType) {
+ if(header.name !== 'Proc-Type') {
+ throw new Error('Invalid PEM formatted message. The first ' +
+ 'encapsulated header must be "Proc-Type".');
+ } else if(header.values.length !== 2) {
+ throw new Error('Invalid PEM formatted message. The "Proc-Type" ' +
+ 'header must have two subfields.');
+ }
+ msg.procType = {version: values[0], type: values[1]};
+ } else if(!msg.contentDomain && header.name === 'Content-Domain') {
+ // special-case Content-Domain
+ msg.contentDomain = values[0] || '';
+ } else if(!msg.dekInfo && header.name === 'DEK-Info') {
+ // special-case DEK-Info
+ if(header.values.length === 0) {
+ throw new Error('Invalid PEM formatted message. The "DEK-Info" ' +
+ 'header must have at least one subfield.');
+ }
+ msg.dekInfo = {algorithm: values[0], parameters: values[1] || null};
+ } else {
+ msg.headers.push(header);
+ }
+ }
+
+ ++li;
+ }
+
+ if(msg.procType === 'ENCRYPTED' && !msg.dekInfo) {
+ throw new Error('Invalid PEM formatted message. The "DEK-Info" ' +
+ 'header must be present if "Proc-Type" is "ENCRYPTED".');
+ }
+ }
+
+ if(rval.length === 0) {
+ throw new Error('Invalid PEM formatted message.');
+ }
+
+ return rval;
+};
+
+function foldHeader(header) {
+ var rval = header.name + ': ';
+
+ // ensure values with CRLF are folded
+ var values = [];
+ var insertSpace = function(match, $1) {
+ return ' ' + $1;
+ };
+ for(var i = 0; i < header.values.length; ++i) {
+ values.push(header.values[i].replace(/^(\S+\r\n)/, insertSpace));
+ }
+ rval += values.join(',') + '\r\n';
+
+ // do folding
+ var length = 0;
+ var candidate = -1;
+ for(var i = 0; i < rval.length; ++i, ++length) {
+ if(length > 65 && candidate !== -1) {
+ var insert = rval[candidate];
+ if(insert === ',') {
+ ++candidate;
+ rval = rval.substr(0, candidate) + '\r\n ' + rval.substr(candidate);
+ } else {
+ rval = rval.substr(0, candidate) +
+ '\r\n' + insert + rval.substr(candidate + 1);
+ }
+ length = (i - candidate - 1);
+ candidate = -1;
+ ++i;
+ } else if(rval[i] === ' ' || rval[i] === '\t' || rval[i] === ',') {
+ candidate = i;
+ }
+ }
+
+ return rval;
+}
+
+function ltrim(str) {
+ return str.replace(/^\s+/, '');
+}
+
+} // end module implementation
+
+/* ########## Begin module wrapper ########## */
+var name = 'pem';
+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'], function() {
+ defineFunc.apply(null, Array.prototype.slice.call(arguments, 0));
+});
+})();