Updated

node_modules/http-signature/lib/index.js

@@ -0,0 +1,29 @@
+// Copyright 2015 Joyent, Inc.
+
+var parser = require('./parser');
+var signer = require('./signer');
+var verify = require('./verify');
+var utils = require('./utils');
+
+
+
+///--- API
+
+module.exports = {
+
+  parse: parser.parseRequest,
+  parseRequest: parser.parseRequest,
+
+  sign: signer.signRequest,
+  signRequest: signer.signRequest,
+  createSigner: signer.createSigner,
+  isSigner: signer.isSigner,
+
+  sshKeyToPEM: utils.sshKeyToPEM,
+  sshKeyFingerprint: utils.fingerprint,
+  pemToRsaSSHKey: utils.pemToRsaSSHKey,
+
+  verify: verify.verifySignature,
+  verifySignature: verify.verifySignature,
+  verifyHMAC: verify.verifyHMAC
+};

node_modules/http-signature/lib/parser.js

@@ -0,0 +1,315 @@
+// Copyright 2012 Joyent, Inc.  All rights reserved.
+
+var assert = require('assert-plus');
+var util = require('util');
+var utils = require('./utils');
+
+
+
+///--- Globals
+
+var HASH_ALGOS = utils.HASH_ALGOS;
+var PK_ALGOS = utils.PK_ALGOS;
+var HttpSignatureError = utils.HttpSignatureError;
+var InvalidAlgorithmError = utils.InvalidAlgorithmError;
+var validateAlgorithm = utils.validateAlgorithm;
+
+var State = {
+  New: 0,
+  Params: 1
+};
+
+var ParamsState = {
+  Name: 0,
+  Quote: 1,
+  Value: 2,
+  Comma: 3
+};
+
+
+///--- Specific Errors
+
+
+function ExpiredRequestError(message) {
+  HttpSignatureError.call(this, message, ExpiredRequestError);
+}
+util.inherits(ExpiredRequestError, HttpSignatureError);
+
+
+function InvalidHeaderError(message) {
+  HttpSignatureError.call(this, message, InvalidHeaderError);
+}
+util.inherits(InvalidHeaderError, HttpSignatureError);
+
+
+function InvalidParamsError(message) {
+  HttpSignatureError.call(this, message, InvalidParamsError);
+}
+util.inherits(InvalidParamsError, HttpSignatureError);
+
+
+function MissingHeaderError(message) {
+  HttpSignatureError.call(this, message, MissingHeaderError);
+}
+util.inherits(MissingHeaderError, HttpSignatureError);
+
+function StrictParsingError(message) {
+  HttpSignatureError.call(this, message, StrictParsingError);
+}
+util.inherits(StrictParsingError, HttpSignatureError);
+
+///--- Exported API
+
+module.exports = {
+
+  /**
+   * Parses the 'Authorization' header out of an http.ServerRequest object.
+   *
+   * Note that this API will fully validate the Authorization header, and throw
+   * on any error.  It will not however check the signature, or the keyId format
+   * as those are specific to your environment.  You can use the options object
+   * to pass in extra constraints.
+   *
+   * As a response object you can expect this:
+   *
+   *     {
+   *       "scheme": "Signature",
+   *       "params": {
+   *         "keyId": "foo",
+   *         "algorithm": "rsa-sha256",
+   *         "headers": [
+   *           "date" or "x-date",
+   *           "digest"
+   *         ],
+   *         "signature": "base64"
+   *       },
+   *       "signingString": "ready to be passed to crypto.verify()"
+   *     }
+   *
+   * @param {Object} request an http.ServerRequest.
+   * @param {Object} options an optional options object with:
+   *                   - clockSkew: allowed clock skew in seconds (default 300).
+   *                   - headers: required header names (def: date or x-date)
+   *                   - algorithms: algorithms to support (default: all).
+   *                   - strict: should enforce latest spec parsing
+   *                             (default: false).
+   * @return {Object} parsed out object (see above).
+   * @throws {TypeError} on invalid input.
+   * @throws {InvalidHeaderError} on an invalid Authorization header error.
+   * @throws {InvalidParamsError} if the params in the scheme are invalid.
+   * @throws {MissingHeaderError} if the params indicate a header not present,
+   *                              either in the request headers from the params,
+   *                              or not in the params from a required header
+   *                              in options.
+   * @throws {StrictParsingError} if old attributes are used in strict parsing
+   *                              mode.
+   * @throws {ExpiredRequestError} if the value of date or x-date exceeds skew.
+   */
+  parseRequest: function parseRequest(request, options) {
+    assert.object(request, 'request');
+    assert.object(request.headers, 'request.headers');
+    if (options === undefined) {
+      options = {};
+    }
+    if (options.headers === undefined) {
+      options.headers = [request.headers['x-date'] ? 'x-date' : 'date'];
+    }
+    assert.object(options, 'options');
+    assert.arrayOfString(options.headers, 'options.headers');
+    assert.optionalFinite(options.clockSkew, 'options.clockSkew');
+
+    var authzHeaderName = options.authorizationHeaderName || 'authorization';
+
+    if (!request.headers[authzHeaderName]) {
+      throw new MissingHeaderError('no ' + authzHeaderName + ' header ' +
+                                   'present in the request');
+    }
+
+    options.clockSkew = options.clockSkew || 300;
+
+
+    var i = 0;
+    var state = State.New;
+    var substate = ParamsState.Name;
+    var tmpName = '';
+    var tmpValue = '';
+
+    var parsed = {
+      scheme: '',
+      params: {},
+      signingString: ''
+    };
+
+    var authz = request.headers[authzHeaderName];
+    for (i = 0; i < authz.length; i++) {
+      var c = authz.charAt(i);
+
+      switch (Number(state)) {
+
+      case State.New:
+        if (c !== ' ') parsed.scheme += c;
+        else state = State.Params;
+        break;
+
+      case State.Params:
+        switch (Number(substate)) {
+
+        case ParamsState.Name:
+          var code = c.charCodeAt(0);
+          // restricted name of A-Z / a-z
+          if ((code >= 0x41 && code <= 0x5a) || // A-Z
+              (code >= 0x61 && code <= 0x7a)) { // a-z
+            tmpName += c;
+          } else if (c === '=') {
+            if (tmpName.length === 0)
+              throw new InvalidHeaderError('bad param format');
+            substate = ParamsState.Quote;
+          } else {
+            throw new InvalidHeaderError('bad param format');
+          }
+          break;
+
+        case ParamsState.Quote:
+          if (c === '"') {
+            tmpValue = '';
+            substate = ParamsState.Value;
+          } else {
+            throw new InvalidHeaderError('bad param format');
+          }
+          break;
+
+        case ParamsState.Value:
+          if (c === '"') {
+            parsed.params[tmpName] = tmpValue;
+            substate = ParamsState.Comma;
+          } else {
+            tmpValue += c;
+          }
+          break;
+
+        case ParamsState.Comma:
+          if (c === ',') {
+            tmpName = '';
+            substate = ParamsState.Name;
+          } else {
+            throw new InvalidHeaderError('bad param format');
+          }
+          break;
+
+        default:
+          throw new Error('Invalid substate');
+        }
+        break;
+
+      default:
+        throw new Error('Invalid substate');
+      }
+
+    }
+
+    if (!parsed.params.headers || parsed.params.headers === '') {
+      if (request.headers['x-date']) {
+        parsed.params.headers = ['x-date'];
+      } else {
+        parsed.params.headers = ['date'];
+      }
+    } else {
+      parsed.params.headers = parsed.params.headers.split(' ');
+    }
+
+    // Minimally validate the parsed object
+    if (!parsed.scheme || parsed.scheme !== 'Signature')
+      throw new InvalidHeaderError('scheme was not "Signature"');
+
+    if (!parsed.params.keyId)
+      throw new InvalidHeaderError('keyId was not specified');
+
+    if (!parsed.params.algorithm)
+      throw new InvalidHeaderError('algorithm was not specified');
+
+    if (!parsed.params.signature)
+      throw new InvalidHeaderError('signature was not specified');
+
+    // Check the algorithm against the official list
+    parsed.params.algorithm = parsed.params.algorithm.toLowerCase();
+    try {
+      validateAlgorithm(parsed.params.algorithm);
+    } catch (e) {
+      if (e instanceof InvalidAlgorithmError)
+        throw (new InvalidParamsError(parsed.params.algorithm + ' is not ' +
+          'supported'));
+      else
+        throw (e);
+    }
+
+    // Build the signingString
+    for (i = 0; i < parsed.params.headers.length; i++) {
+      var h = parsed.params.headers[i].toLowerCase();
+      parsed.params.headers[i] = h;
+
+      if (h === 'request-line') {
+        if (!options.strict) {
+          /*
+           * We allow headers from the older spec drafts if strict parsing isn't
+           * specified in options.
+           */
+          parsed.signingString +=
+            request.method + ' ' + request.url + ' HTTP/' + request.httpVersion;
+        } else {
+          /* Strict parsing doesn't allow older draft headers. */
+          throw (new StrictParsingError('request-line is not a valid header ' +
+            'with strict parsing enabled.'));
+        }
+      } else if (h === '(request-target)') {
+        parsed.signingString +=
+          '(request-target): ' + request.method.toLowerCase() + ' ' +
+          request.url;
+      } else {
+        var value = request.headers[h];
+        if (value === undefined)
+          throw new MissingHeaderError(h + ' was not in the request');
+        parsed.signingString += h + ': ' + value;
+      }
+
+      if ((i + 1) < parsed.params.headers.length)
+        parsed.signingString += '\n';
+    }
+
+    // Check against the constraints
+    var date;
+    if (request.headers.date || request.headers['x-date']) {
+        if (request.headers['x-date']) {
+          date = new Date(request.headers['x-date']);
+        } else {
+          date = new Date(request.headers.date);
+        }
+      var now = new Date();
+      var skew = Math.abs(now.getTime() - date.getTime());
+
+      if (skew > options.clockSkew * 1000) {
+        throw new ExpiredRequestError('clock skew of ' +
+                                      (skew / 1000) +
+                                      's was greater than ' +
+                                      options.clockSkew + 's');
+      }
+    }
+
+    options.headers.forEach(function (hdr) {
+      // Remember that we already checked any headers in the params
+      // were in the request, so if this passes we're good.
+      if (parsed.params.headers.indexOf(hdr.toLowerCase()) < 0)
+        throw new MissingHeaderError(hdr + ' was not a signed header');
+    });
+
+    if (options.algorithms) {
+      if (options.algorithms.indexOf(parsed.params.algorithm) === -1)
+        throw new InvalidParamsError(parsed.params.algorithm +
+                                     ' is not a supported algorithm');
+    }
+
+    parsed.algorithm = parsed.params.algorithm.toUpperCase();
+    parsed.keyId = parsed.params.keyId;
+    return parsed;
+  }
+
+};

node_modules/http-signature/lib/signer.js

@@ -0,0 +1,401 @@
+// Copyright 2012 Joyent, Inc.  All rights reserved.
+
+var assert = require('assert-plus');
+var crypto = require('crypto');
+var http = require('http');
+var util = require('util');
+var sshpk = require('sshpk');
+var jsprim = require('jsprim');
+var utils = require('./utils');
+
+var sprintf = require('util').format;
+
+var HASH_ALGOS = utils.HASH_ALGOS;
+var PK_ALGOS = utils.PK_ALGOS;
+var InvalidAlgorithmError = utils.InvalidAlgorithmError;
+var HttpSignatureError = utils.HttpSignatureError;
+var validateAlgorithm = utils.validateAlgorithm;
+
+///--- Globals
+
+var AUTHZ_FMT =
+  'Signature keyId="%s",algorithm="%s",headers="%s",signature="%s"';
+
+///--- Specific Errors
+
+function MissingHeaderError(message) {
+  HttpSignatureError.call(this, message, MissingHeaderError);
+}
+util.inherits(MissingHeaderError, HttpSignatureError);
+
+function StrictParsingError(message) {
+  HttpSignatureError.call(this, message, StrictParsingError);
+}
+util.inherits(StrictParsingError, HttpSignatureError);
+
+/* See createSigner() */
+function RequestSigner(options) {
+  assert.object(options, 'options');
+
+  var alg = [];
+  if (options.algorithm !== undefined) {
+    assert.string(options.algorithm, 'options.algorithm');
+    alg = validateAlgorithm(options.algorithm);
+  }
+  this.rs_alg = alg;
+
+  /*
+   * RequestSigners come in two varieties: ones with an rs_signFunc, and ones
+   * with an rs_signer.
+   *
+   * rs_signFunc-based RequestSigners have to build up their entire signing
+   * string within the rs_lines array and give it to rs_signFunc as a single
+   * concat'd blob. rs_signer-based RequestSigners can add a line at a time to
+   * their signing state by using rs_signer.update(), thus only needing to
+   * buffer the hash function state and one line at a time.
+   */
+  if (options.sign !== undefined) {
+    assert.func(options.sign, 'options.sign');
+    this.rs_signFunc = options.sign;
+
+  } else if (alg[0] === 'hmac' && options.key !== undefined) {
+    assert.string(options.keyId, 'options.keyId');
+    this.rs_keyId = options.keyId;
+
+    if (typeof (options.key) !== 'string' && !Buffer.isBuffer(options.key))
+      throw (new TypeError('options.key for HMAC must be a string or Buffer'));
+
+    /*
+     * Make an rs_signer for HMACs, not a rs_signFunc -- HMACs digest their
+     * data in chunks rather than requiring it all to be given in one go
+     * at the end, so they are more similar to signers than signFuncs.
+     */
+    this.rs_signer = crypto.createHmac(alg[1].toUpperCase(), options.key);
+    this.rs_signer.sign = function () {
+      var digest = this.digest('base64');
+      return ({
+        hashAlgorithm: alg[1],
+        toString: function () { return (digest); }
+      });
+    };
+
+  } else if (options.key !== undefined) {
+    var key = options.key;
+    if (typeof (key) === 'string' || Buffer.isBuffer(key))
+      key = sshpk.parsePrivateKey(key);
+
+    assert.ok(sshpk.PrivateKey.isPrivateKey(key, [1, 2]),
+      'options.key must be a sshpk.PrivateKey');
+    this.rs_key = key;
+
+    assert.string(options.keyId, 'options.keyId');
+    this.rs_keyId = options.keyId;
+
+    if (!PK_ALGOS[key.type]) {
+      throw (new InvalidAlgorithmError(key.type.toUpperCase() + ' type ' +
+        'keys are not supported'));
+    }
+
+    if (alg[0] !== undefined && key.type !== alg[0]) {
+      throw (new InvalidAlgorithmError('options.key must be a ' +
+        alg[0].toUpperCase() + ' key, was given a ' +
+        key.type.toUpperCase() + ' key instead'));
+    }
+
+    this.rs_signer = key.createSign(alg[1]);
+
+  } else {
+    throw (new TypeError('options.sign (func) or options.key is required'));
+  }
+
+  this.rs_headers = [];
+  this.rs_lines = [];
+}
+
+/**
+ * Adds a header to be signed, with its value, into this signer.
+ *
+ * @param {String} header
+ * @param {String} value
+ * @return {String} value written
+ */
+RequestSigner.prototype.writeHeader = function (header, value) {
+  assert.string(header, 'header');
+  header = header.toLowerCase();
+  assert.string(value, 'value');
+
+  this.rs_headers.push(header);
+
+  if (this.rs_signFunc) {
+    this.rs_lines.push(header + ': ' + value);
+
+  } else {
+    var line = header + ': ' + value;
+    if (this.rs_headers.length > 0)
+      line = '\n' + line;
+    this.rs_signer.update(line);
+  }
+
+  return (value);
+};
+
+/**
+ * Adds a default Date header, returning its value.
+ *
+ * @return {String}
+ */
+RequestSigner.prototype.writeDateHeader = function () {
+  return (this.writeHeader('date', jsprim.rfc1123(new Date())));
+};
+
+/**
+ * Adds the request target line to be signed.
+ *
+ * @param {String} method, HTTP method (e.g. 'get', 'post', 'put')
+ * @param {String} path
+ */
+RequestSigner.prototype.writeTarget = function (method, path) {
+  assert.string(method, 'method');
+  assert.string(path, 'path');
+  method = method.toLowerCase();
+  this.writeHeader('(request-target)', method + ' ' + path);
+};
+
+/**
+ * Calculate the value for the Authorization header on this request
+ * asynchronously.
+ *
+ * @param {Func} callback (err, authz)
+ */
+RequestSigner.prototype.sign = function (cb) {
+  assert.func(cb, 'callback');
+
+  if (this.rs_headers.length < 1)
+    throw (new Error('At least one header must be signed'));
+
+  var alg, authz;
+  if (this.rs_signFunc) {
+    var data = this.rs_lines.join('\n');
+    var self = this;
+    this.rs_signFunc(data, function (err, sig) {
+      if (err) {
+        cb(err);
+        return;
+      }
+      try {
+        assert.object(sig, 'signature');
+        assert.string(sig.keyId, 'signature.keyId');
+        assert.string(sig.algorithm, 'signature.algorithm');
+        assert.string(sig.signature, 'signature.signature');
+        alg = validateAlgorithm(sig.algorithm);
+
+        authz = sprintf(AUTHZ_FMT,
+          sig.keyId,
+          sig.algorithm,
+          self.rs_headers.join(' '),
+          sig.signature);
+      } catch (e) {
+        cb(e);
+        return;
+      }
+      cb(null, authz);
+    });
+
+  } else {
+    try {
+      var sigObj = this.rs_signer.sign();
+    } catch (e) {
+      cb(e);
+      return;
+    }
+    alg = (this.rs_alg[0] || this.rs_key.type) + '-' + sigObj.hashAlgorithm;
+    var signature = sigObj.toString();
+    authz = sprintf(AUTHZ_FMT,
+      this.rs_keyId,
+      alg,
+      this.rs_headers.join(' '),
+      signature);
+    cb(null, authz);
+  }
+};
+
+///--- Exported API
+
+module.exports = {
+  /**
+   * Identifies whether a given object is a request signer or not.
+   *
+   * @param {Object} object, the object to identify
+   * @returns {Boolean}
+   */
+  isSigner: function (obj) {
+    if (typeof (obj) === 'object' && obj instanceof RequestSigner)
+      return (true);
+    return (false);
+  },
+
+  /**
+   * Creates a request signer, used to asynchronously build a signature
+   * for a request (does not have to be an http.ClientRequest).
+   *
+   * @param {Object} options, either:
+   *                   - {String} keyId
+   *                   - {String|Buffer} key
+   *                   - {String} algorithm (optional, required for HMAC)
+   *                 or:
+   *                   - {Func} sign (data, cb)
+   * @return {RequestSigner}
+   */
+  createSigner: function createSigner(options) {
+    return (new RequestSigner(options));
+  },
+
+  /**
+   * Adds an 'Authorization' header to an http.ClientRequest object.
+   *
+   * Note that this API will add a Date header if it's not already set. Any
+   * other headers in the options.headers array MUST be present, or this
+   * will throw.
+   *
+   * You shouldn't need to check the return type; it's just there if you want
+   * to be pedantic.
+   *
+   * The optional flag indicates whether parsing should use strict enforcement
+   * of the version draft-cavage-http-signatures-04 of the spec or beyond.
+   * The default is to be loose and support
+   * older versions for compatibility.
+   *
+   * @param {Object} request an instance of http.ClientRequest.
+   * @param {Object} options signing parameters object:
+   *                   - {String} keyId required.
+   *                   - {String} key required (either a PEM or HMAC key).
+   *                   - {Array} headers optional; defaults to ['date'].
+   *                   - {String} algorithm optional (unless key is HMAC);
+   *                              default is the same as the sshpk default
+   *                              signing algorithm for the type of key given
+   *                   - {String} httpVersion optional; defaults to '1.1'.
+   *                   - {Boolean} strict optional; defaults to 'false'.
+   * @return {Boolean} true if Authorization (and optionally Date) were added.
+   * @throws {TypeError} on bad parameter types (input).
+   * @throws {InvalidAlgorithmError} if algorithm was bad or incompatible with
+   *                                 the given key.
+   * @throws {sshpk.KeyParseError} if key was bad.
+   * @throws {MissingHeaderError} if a header to be signed was specified but
+   *                              was not present.
+   */
+  signRequest: function signRequest(request, options) {
+    assert.object(request, 'request');
+    assert.object(options, 'options');
+    assert.optionalString(options.algorithm, 'options.algorithm');
+    assert.string(options.keyId, 'options.keyId');
+    assert.optionalArrayOfString(options.headers, 'options.headers');
+    assert.optionalString(options.httpVersion, 'options.httpVersion');
+
+    if (!request.getHeader('Date'))
+      request.setHeader('Date', jsprim.rfc1123(new Date()));
+    if (!options.headers)
+      options.headers = ['date'];
+    if (!options.httpVersion)
+      options.httpVersion = '1.1';
+
+    var alg = [];
+    if (options.algorithm) {
+      options.algorithm = options.algorithm.toLowerCase();
+      alg = validateAlgorithm(options.algorithm);
+    }
+
+    var i;
+    var stringToSign = '';
+    for (i = 0; i < options.headers.length; i++) {
+      if (typeof (options.headers[i]) !== 'string')
+        throw new TypeError('options.headers must be an array of Strings');
+
+      var h = options.headers[i].toLowerCase();
+
+      if (h === 'request-line') {
+        if (!options.strict) {
+          /**
+           * We allow headers from the older spec drafts if strict parsing isn't
+           * specified in options.
+           */
+          stringToSign +=
+            request.method + ' ' + request.path + ' HTTP/' +
+            options.httpVersion;
+        } else {
+          /* Strict parsing doesn't allow older draft headers. */
+          throw (new StrictParsingError('request-line is not a valid header ' +
+            'with strict parsing enabled.'));
+        }
+      } else if (h === '(request-target)') {
+        stringToSign +=
+          '(request-target): ' + request.method.toLowerCase() + ' ' +
+          request.path;
+      } else {
+        var value = request.getHeader(h);
+        if (value === undefined || value === '') {
+          throw new MissingHeaderError(h + ' was not in the request');
+        }
+        stringToSign += h + ': ' + value;
+      }
+
+      if ((i + 1) < options.headers.length)
+        stringToSign += '\n';
+    }
+
+    /* This is just for unit tests. */
+    if (request.hasOwnProperty('_stringToSign')) {
+      request._stringToSign = stringToSign;
+    }
+
+    var signature;
+    if (alg[0] === 'hmac') {
+      if (typeof (options.key) !== 'string' && !Buffer.isBuffer(options.key))
+        throw (new TypeError('options.key must be a string or Buffer'));
+
+      var hmac = crypto.createHmac(alg[1].toUpperCase(), options.key);
+      hmac.update(stringToSign);
+      signature = hmac.digest('base64');
+
+    } else {
+      var key = options.key;
+      if (typeof (key) === 'string' || Buffer.isBuffer(key))
+        key = sshpk.parsePrivateKey(options.key);
+
+      assert.ok(sshpk.PrivateKey.isPrivateKey(key, [1, 2]),
+        'options.key must be a sshpk.PrivateKey');
+
+      if (!PK_ALGOS[key.type]) {
+        throw (new InvalidAlgorithmError(key.type.toUpperCase() + ' type ' +
+          'keys are not supported'));
+      }
+
+      if (alg[0] !== undefined && key.type !== alg[0]) {
+        throw (new InvalidAlgorithmError('options.key must be a ' +
+          alg[0].toUpperCase() + ' key, was given a ' +
+          key.type.toUpperCase() + ' key instead'));
+      }
+
+      var signer = key.createSign(alg[1]);
+      signer.update(stringToSign);
+      var sigObj = signer.sign();
+      if (!HASH_ALGOS[sigObj.hashAlgorithm]) {
+        throw (new InvalidAlgorithmError(sigObj.hashAlgorithm.toUpperCase() +
+          ' is not a supported hash algorithm'));
+      }
+      options.algorithm = key.type + '-' + sigObj.hashAlgorithm;
+      signature = sigObj.toString();
+      assert.notStrictEqual(signature, '', 'empty signature produced');
+    }
+
+    var authzHeaderName = options.authorizationHeaderName || 'Authorization';
+
+    request.setHeader(authzHeaderName, sprintf(AUTHZ_FMT,
+                                               options.keyId,
+                                               options.algorithm,
+                                               options.headers.join(' '),
+                                               signature));
+
+    return true;
+  }
+
+};

node_modules/http-signature/lib/utils.js

@@ -0,0 +1,112 @@
+// Copyright 2012 Joyent, Inc.  All rights reserved.
+
+var assert = require('assert-plus');
+var sshpk = require('sshpk');
+var util = require('util');
+
+var HASH_ALGOS = {
+  'sha1': true,
+  'sha256': true,
+  'sha512': true
+};
+
+var PK_ALGOS = {
+  'rsa': true,
+  'dsa': true,
+  'ecdsa': true
+};
+
+function HttpSignatureError(message, caller) {
+  if (Error.captureStackTrace)
+    Error.captureStackTrace(this, caller || HttpSignatureError);
+
+  this.message = message;
+  this.name = caller.name;
+}
+util.inherits(HttpSignatureError, Error);
+
+function InvalidAlgorithmError(message) {
+  HttpSignatureError.call(this, message, InvalidAlgorithmError);
+}
+util.inherits(InvalidAlgorithmError, HttpSignatureError);
+
+function validateAlgorithm(algorithm) {
+  var alg = algorithm.toLowerCase().split('-');
+
+  if (alg.length !== 2) {
+    throw (new InvalidAlgorithmError(alg[0].toUpperCase() + ' is not a ' +
+      'valid algorithm'));
+  }
+
+  if (alg[0] !== 'hmac' && !PK_ALGOS[alg[0]]) {
+    throw (new InvalidAlgorithmError(alg[0].toUpperCase() + ' type keys ' +
+      'are not supported'));
+  }
+
+  if (!HASH_ALGOS[alg[1]]) {
+    throw (new InvalidAlgorithmError(alg[1].toUpperCase() + ' is not a ' +
+      'supported hash algorithm'));
+  }
+
+  return (alg);
+}
+
+///--- API
+
+module.exports = {
+
+  HASH_ALGOS: HASH_ALGOS,
+  PK_ALGOS: PK_ALGOS,
+
+  HttpSignatureError: HttpSignatureError,
+  InvalidAlgorithmError: InvalidAlgorithmError,
+
+  validateAlgorithm: validateAlgorithm,
+
+  /**
+   * Converts an OpenSSH public key (rsa only) to a PKCS#8 PEM file.
+   *
+   * The intent of this module is to interoperate with OpenSSL only,
+   * specifically the node crypto module's `verify` method.
+   *
+   * @param {String} key an OpenSSH public key.
+   * @return {String} PEM encoded form of the RSA public key.
+   * @throws {TypeError} on bad input.
+   * @throws {Error} on invalid ssh key formatted data.
+   */
+  sshKeyToPEM: function sshKeyToPEM(key) {
+    assert.string(key, 'ssh_key');
+
+    var k = sshpk.parseKey(key, 'ssh');
+    return (k.toString('pem'));
+  },
+
+
+  /**
+   * Generates an OpenSSH fingerprint from an ssh public key.
+   *
+   * @param {String} key an OpenSSH public key.
+   * @return {String} key fingerprint.
+   * @throws {TypeError} on bad input.
+   * @throws {Error} if what you passed doesn't look like an ssh public key.
+   */
+  fingerprint: function fingerprint(key) {
+    assert.string(key, 'ssh_key');
+
+    var k = sshpk.parseKey(key, 'ssh');
+    return (k.fingerprint('md5').toString('hex'));
+  },
+
+  /**
+   * Converts a PKGCS#8 PEM file to an OpenSSH public key (rsa)
+   *
+   * The reverse of the above function.
+   */
+  pemToRsaSSHKey: function pemToRsaSSHKey(pem, comment) {
+    assert.equal('string', typeof (pem), 'typeof pem');
+
+    var k = sshpk.parseKey(pem, 'pem');
+    k.comment = comment;
+    return (k.toString('ssh'));
+  }
+};

node_modules/http-signature/lib/verify.js

@@ -0,0 +1,88 @@
+// Copyright 2015 Joyent, Inc.
+
+var assert = require('assert-plus');
+var crypto = require('crypto');
+var sshpk = require('sshpk');
+var utils = require('./utils');
+
+var HASH_ALGOS = utils.HASH_ALGOS;
+var PK_ALGOS = utils.PK_ALGOS;
+var InvalidAlgorithmError = utils.InvalidAlgorithmError;
+var HttpSignatureError = utils.HttpSignatureError;
+var validateAlgorithm = utils.validateAlgorithm;
+
+///--- Exported API
+
+module.exports = {
+  /**
+   * Verify RSA/DSA signature against public key.  You are expected to pass in
+   * an object that was returned from `parse()`.
+   *
+   * @param {Object} parsedSignature the object you got from `parse`.
+   * @param {String} pubkey RSA/DSA private key PEM.
+   * @return {Boolean} true if valid, false otherwise.
+   * @throws {TypeError} if you pass in bad arguments.
+   * @throws {InvalidAlgorithmError}
+   */
+  verifySignature: function verifySignature(parsedSignature, pubkey) {
+    assert.object(parsedSignature, 'parsedSignature');
+    if (typeof (pubkey) === 'string' || Buffer.isBuffer(pubkey))
+      pubkey = sshpk.parseKey(pubkey);
+    assert.ok(sshpk.Key.isKey(pubkey, [1, 1]), 'pubkey must be a sshpk.Key');
+
+    var alg = validateAlgorithm(parsedSignature.algorithm);
+    if (alg[0] === 'hmac' || alg[0] !== pubkey.type)
+      return (false);
+
+    var v = pubkey.createVerify(alg[1]);
+    v.update(parsedSignature.signingString);
+    return (v.verify(parsedSignature.params.signature, 'base64'));
+  },
+
+  /**
+   * Verify HMAC against shared secret.  You are expected to pass in an object
+   * that was returned from `parse()`.
+   *
+   * @param {Object} parsedSignature the object you got from `parse`.
+   * @param {String} secret HMAC shared secret.
+   * @return {Boolean} true if valid, false otherwise.
+   * @throws {TypeError} if you pass in bad arguments.
+   * @throws {InvalidAlgorithmError}
+   */
+  verifyHMAC: function verifyHMAC(parsedSignature, secret) {
+    assert.object(parsedSignature, 'parsedHMAC');
+    assert.string(secret, 'secret');
+
+    var alg = validateAlgorithm(parsedSignature.algorithm);
+    if (alg[0] !== 'hmac')
+      return (false);
+
+    var hashAlg = alg[1].toUpperCase();
+
+    var hmac = crypto.createHmac(hashAlg, secret);
+    hmac.update(parsedSignature.signingString);
+
+    /*
+     * Now double-hash to avoid leaking timing information - there's
+     * no easy constant-time compare in JS, so we use this approach
+     * instead. See for more info:
+     * https://www.isecpartners.com/blog/2011/february/double-hmac-
+     * verification.aspx
+     */
+    var h1 = crypto.createHmac(hashAlg, secret);
+    h1.update(hmac.digest());
+    h1 = h1.digest();
+    var h2 = crypto.createHmac(hashAlg, secret);
+    h2.update(new Buffer(parsedSignature.params.signature, 'base64'));
+    h2 = h2.digest();
+
+    /* Node 0.8 returns strings from .digest(). */
+    if (typeof (h1) === 'string')
+      return (h1 === h2);
+    /* And node 0.10 lacks the .equals() method on Buffers. */
+    if (Buffer.isBuffer(h1) && !h1.equals)
+      return (h1.toString('binary') === h2.toString('binary'));
+
+    return (h1.equals(h2));
+  }
+};