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app_vue/node_modules/node-forge/lib/pem.js

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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.
+ */
+var forge = require('./forge');
+require('./util');
+
+// shortcut for pem API
+var pem = module.exports = 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;
+    }
+
+    // accept "NEW CERTIFICATE REQUEST" as "CERTIFICATE REQUEST"
+    // https://datatracker.ietf.org/doc/html/rfc7468#section-7
+    var type = match[1];
+    if(type === 'NEW CERTIFICATE REQUEST') {
+      type = 'CERTIFICATE REQUEST';
+    }
+
+    var msg = {
+      type: type,
+      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+/, '');
+}