initial commit

diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644 (file)
index 0000000..697136a
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,89 @@
+{
+  "env": {
+    "browser": false,
+    "es6": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:node/recommended",
+    "plugin:security/recommended",
+    "plugin:sonarjs/recommended"
+  ],
+  "parserOptions": {
+    "ecmaVersion": 2018
+  },
+  "plugins": [
+    "node",
+    "security",
+    "sonarjs"
+  ],
+  "rules": {
+    "array-element-newline": [
+      "error",
+      "consistent"
+    ],
+    "arrow-parens": [
+      "error",
+      "always"
+    ],
+    "arrow-spacing": [
+      "error",
+      {
+        "after": true,
+        "before": true
+      }
+    ],
+    "block-scoped-var": "error",
+    "block-spacing": "error",
+    "brace-style": "error",
+    "callback-return": "error",
+    "camelcase": "error",
+    "class-methods-use-this": "error",
+    "comma-dangle": [
+      "error",
+      "always-multiline"
+    ],
+    "comma-spacing": [
+      "error",
+      {
+        "after": true,
+        "before": false
+      }
+    ],
+    "comma-style": [
+      "error",
+      "last"
+    ],
+    "indent": [
+      "warn",
+      2,
+      {
+        "SwitchCase": 1
+      }
+    ],
+    "sonarjs/cognitive-complexity": "warn",
+    "sonarjs/no-duplicate-string": "warn",
+    "keyword-spacing": "error",
+    "linebreak-style": [
+      "error",
+      "unix"
+    ],
+    "no-unused-vars": [
+      "error", {
+        "varsIgnorePattern": "^_"
+      }
+    ],
+    "object-curly-spacing": [
+      "error",
+      "always"
+    ],
+    "prefer-const": "error",
+    "quotes": [
+      "warn",
+      "single"
+    ],
+    "strict": "error",
+    "vars-on-top": "error"
+  }
+}

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..defafb1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+coverage
+node_modules
+.nyc_output
+.vscode

diff --git a/.nycrc.json b/.nycrc.json
new file mode 100644 (file)
index 0000000..9633f6d
--- /dev/null
+++ b/.nycrc.json
@@ -0,0 +1,8 @@
+{
+  "check-coverage": true,
+  "functions": 100,
+  "lines": 100,
+  "per-file": true,
+  "reporter": ["lcov", "text"],
+  "statements": 100
+}

diff --git a/README.md b/README.md
new file mode 100644 (file)
index 0000000..e070bb2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,10 @@
+# Mystery Box
+
+Our very own way of converting a buffer or serializable object to and from an opaque and web-safe representation, which we can let anyone see without disclosing the contents, nor allowing it to be modified without detection.
+
+In our case, this results in a Base64URL encoded string containing a bespoke packing of encrypted and verified data.
+
+## API
+
+- pack(contents, version, flags)
+- unpack(box)

diff --git a/index.js b/index.js
new file mode 100644 (file)
index 0000000..edc09e1
--- /dev/null
+++ b/index.js
@@ -0,0 +1,7 @@
+'use strict';
+
+const MysteryBox = require('./lib/mystery-box');
+
+module.exports = {
+  MysteryBox,
+};

diff --git a/lib/common.js b/lib/common.js
new file mode 100644 (file)
index 0000000..fb3ec97
--- /dev/null
+++ b/lib/common.js
@@ -0,0 +1,68 @@
+'use strict';
+
+const path = require('path');
+const { randomBytes } = require('crypto');
+const { promisify } = require('util');
+const randomBytesAsync = promisify(randomBytes);
+
+
+/**
+ * Return a function which combines a part of the filename with a scope, for use in logging.
+ * @param {string} filename
+ */
+const fileScope = (filename) => {
+  let fScope = path.basename(filename, '.js');
+  if (fScope === 'index') {
+    fScope = path.basename(path.dirname(filename));
+  }
+  return (scope) => `${fScope}:${scope}`;
+}
+
+
+/**
+ * Convert Base64 to Base64URL.
+ * @param {String} input
+ * @returns {String}
+ */
+const base64ToBase64URL = (input) => {
+  return input
+    .replace(/=/g, '')
+    .replace(/\+/g, '-')
+    .replace(/\//g, '_');
+};
+
+
+/**
+ * Convert Base64URL to normal Base64.
+ * @param {String} input
+ * @returns {String}
+ */
+const base64URLToBase64 = (input) => {
+  return base64RePad(input)
+    .replace(/-/g, '+')
+    .replace(/_/, '/');
+};
+
+
+/**
+ * Add any missing trailing padding which may have been removed from Base64URL encoding.
+ * @param {String} input
+ */
+const base64RePad = (input) => {
+  const blockSize = 4;
+  const lastBlockSize = input.length % blockSize;
+  if (lastBlockSize) {
+    const missing = blockSize - lastBlockSize;
+    return input + '='.repeat(missing);
+  }
+  return input;
+};
+
+
+module.exports = {
+  base64ToBase64URL,
+  base64URLToBase64,
+  base64RePad,
+  fileScope,
+  randomBytesAsync,
+};
\ No newline at end of file

diff --git a/lib/mystery-box.js b/lib/mystery-box.js
new file mode 100644 (file)
index 0000000..be12245
--- /dev/null
+++ b/lib/mystery-box.js
@@ -0,0 +1,308 @@
+'use strict';
+
+const crypto = require('crypto');
+const zlib = require('zlib');
+const { promisify } = require('util');
+const common = require('./common');
+const allVersions = require('./version-parameters');
+const { performance } = require('perf_hooks');
+
+const _fileScope = common.fileScope(__filename);
+
+const brotliCompressAsync = promisify(zlib.brotliCompress);
+const brotliDecompressAsync = promisify(zlib.brotliDecompress);
+const deflateRawAsync = promisify(zlib.deflateRaw);
+const inflateRawAsync = promisify(zlib.inflateRaw);
+const scryptAsync = promisify(crypto.scrypt);
+
+/**
+ * Only you will know what's inside your...
+ *    \  |            |               | __ )
+ *   |\/ | |   |  __| __|  _ \  __|   | __ \   _ \ \  /
+ *   |   | |   |\__ \ |    __/ |  |   | |   | (   |`  <
+ *  _|  _|\__, |____/\__|\___|_| \__, |____/ \___/ _/\_\
+ *        ____/                  ____/
+ *
+ * Our very own way of converting a buffer or serializable object
+ * to and from an opaque and web-safe representation, which we can
+ * let anyone see without disclosing the contents, nor allowing it
+ * to be modified without detection.
+ * 
+ * The result is a Base64URL-encoded byte-array consisting of:
+ * - version, indicating format and encryption algorithm
+ * - flags, indicating state of the contents
+ * - iv/nonce, randomness for the algorithm
+ * - salt, applied to a secret to derive a key
+ * - tag, additional room for encryption to validate the previous fields
+ * - payload, encrypted version of possibly compressed and serialized object
+ *
+ */
+
+
+const availableFlags = {
+  Brotli: (1<<0), // Slightly better compression, but slow
+  Flate: (1<<1), // Slightly worse compression, but much faster especially with larger payloads.  Prefer this.
+  FutureCompression: (1<<0)|(1<<1), // Something else, like zstd maybe.
+
+  Unused2: (1<<2),
+  Unused3: (1<<3),
+  Unused4: (1<<4),
+  Unused5: (1<<5),
+  Unused6: (1<<6),
+
+  BufferPayload: (1<<7), // Payload is a buffer, not an object
+};
+const compressionFlagsMask = (availableFlags.Flate | availableFlags.Brotli);
+const compressionFlagsShift = 0;
+const payloadFlagsMask = (availableFlags.BufferPayload);
+const payloadFlagsShift = 7;
+
+
+class MysteryBox {
+  /**
+   * @param {Console} logger
+   * @param {Object} options
+   * @param {String} options.encryptionSecret
+   * @param {Number=} options.defaultFlags
+   */
+  constructor(logger, options = {}) {
+    this.logger = logger;
+    this.options = options;
+
+    this.secret = options.encryptionSecret;
+    if (!this.secret) {
+      throw new Error('missing encryption secret');
+    }
+    // TODO: support secret rolling
+
+    // Filter any unavailable algorithms
+    const availableCiphers = crypto.getCiphers();
+    this.versionParameters = Object.entries(allVersions).reduce((acc, [v, p]) => {
+      if (availableCiphers.includes(p.algorithm)) {
+        acc[v] = p; // eslint-disable-line security/detect-object-injection
+      }
+      return acc;
+    }, {});
+
+    // Default to highest
+    this.bestVersion = Number(Object.keys(this.versionParameters).sort().pop());
+    if (Number.isNaN(this.bestVersion)) {
+      throw new Error('no supported versions available');
+    }
+
+    this.Flags = availableFlags;
+    this.defaultFlags = 'defaultFlags' in options ? options.defaultFlags : availableFlags.Flate;
+    if (this.defaultFlags < 0 || this.defaultFlags > 255) {
+      throw new RangeError('Invalid default flag value');
+    }
+  }
+
+
+  /**
+   * Parse the bits out of the flags.
+   */
+  static _decodeFlags(flags) {
+    return {
+      compression: (flags & compressionFlagsMask) >> compressionFlagsShift,
+      payloadIsBuffer: Boolean((flags & payloadFlagsMask) >> payloadFlagsShift),
+    };
+  }
+
+
+  /**
+   * Put contents into a mysterious box.
+   * @param {Object|Buffer} contents
+   * @returns {String}
+   */
+  async pack(contents, version = this.bestVersion, flags = this.defaultFlags) {
+    const _scope = _fileScope('pack');
+    const timingsMs = {
+      start: performance.now(),
+      preCompress: 0,
+      postCompress: 0,
+      preEncrypt: 0,
+      postEncrypt: 0,
+      end: 0,
+    };
+
+    if (!(version in this.versionParameters)) {
+      throw new RangeError(`MysteryBox format version ${version} not supported`);
+    }
+    // eslint-disable-next-line security/detect-object-injection
+    const v = this.versionParameters[version];
+
+    const { compression } = MysteryBox._decodeFlags(flags);
+
+    if (Buffer.isBuffer(contents)) {
+      flags |= this.Flags.BufferPayload;
+    } else {
+      contents = JSON.stringify(contents);
+    }
+
+    const versionBuffer = Buffer.alloc(v.versionBytes);
+    versionBuffer.writeUInt8(v.version, 0);
+
+    const [iv, salt] = await Promise.all([
+      v.ivBytes,
+      v.saltBytes,
+    ].map((b) => common.randomBytesAsync(b)));
+
+    timingsMs.preCompress = performance.now();
+    let compressedContents;
+    switch (compression) {
+      case 0: // No compression requested
+        compressedContents = contents;
+        break;
+      case this.Flags.Brotli:
+        compressedContents = await brotliCompressAsync(contents);
+        break;
+      case this.Flags.Flate:
+        compressedContents = await deflateRawAsync(contents);
+        break;
+    }
+    timingsMs.postCompress = timingsMs.preCrypt = performance.now();
+
+    let payload;
+    if (compressedContents.length >= contents.length) {
+      flags = flags & ~compressionFlagsMask;
+      payload = contents;
+    } else {
+      payload = compressedContents;
+    }
+    const flagsBuffer = Buffer.alloc(v.flagsBytes);
+    flagsBuffer.writeUInt8(flags, 0);
+
+    // Authenticate all this data
+    const aadBuffer = Buffer.concat([versionBuffer, flagsBuffer, iv, salt]);
+
+    const key = await scryptAsync(this.secret, salt, v.keyBytes);
+    const cipher = crypto.createCipheriv(v.algorithm, key, iv, v.algOptions);
+    cipher.setAAD(aadBuffer);
+    const encrypted = cipher.update(payload);
+    const final = cipher.final();
+    const tag = cipher.getAuthTag();
+
+    const merged = Buffer.concat([versionBuffer, flagsBuffer, iv, salt, tag, encrypted, final]).toString('base64');
+    const result = common.base64ToBase64URL(merged);
+    timingsMs.end = timingsMs.postCrypt = performance.now();
+
+    this.logger.debug(_scope, 'statistics', { version, flags: this._prettyFlags(flags), serialized: contents.length, compressed: payload.length, encoded: result.length, ...MysteryBox._timingsLog(timingsMs) });
+
+    return result;
+  }
+
+
+  /**
+   * Take contents out of a mysterious box.
+   * @param {String} box - Base64URL encoded payload
+   * @returns {Object}
+   */
+  async unpack(box) {
+    const _scope = _fileScope('unpack');
+    const timingsMs = {
+      start: performance.now(),
+      preCompress: 0,
+      postCompress: 0,
+      preCrypt: 0,
+      postCrypt: 0,
+      end: 0,
+    };
+
+    const raw = Buffer.from(common.base64URLToBase64(box), 'base64');
+    let offset = 0;
+
+    const version = raw.slice(offset, 1).readUInt8(0);
+    if (!(version in this.versionParameters)) {
+      throw new RangeError('unsupported version');
+    }
+    // eslint-disable-next-line security/detect-object-injection
+    const v = this.versionParameters[version];
+    offset += v.versionBytes;
+
+    const flags = raw.slice(offset, offset + v.flagsBytes).readUInt8(0);
+    offset += v.flagsBytes;
+
+    const { compression, payloadIsBuffer } = MysteryBox._decodeFlags(flags);
+
+    const iv = raw.slice(offset, offset + v.ivBytes);
+    offset += v.ivBytes;
+
+    const salt = raw.slice(offset, offset + v.saltBytes);
+    offset += v.saltBytes;
+
+    const aad = raw.slice(0, offset); // Everything up to here
+
+    const tag = raw.slice(offset, offset + v.tagBytes);
+    offset += v.tagBytes;
+
+    const encrypted = raw.slice(offset);
+
+    timingsMs.preCrypt = performance.now();
+    const key = await scryptAsync(this.secret, salt, v.keyBytes);
+    const decipher = crypto.createDecipheriv(v.algorithm, key, iv, v.algOptions);
+    decipher.setAAD(aad);
+    decipher.setAuthTag(tag);
+
+    const decrypted = Buffer.concat([decipher.update(encrypted), decipher.final()]);
+
+    let payload;
+    timingsMs.preCompress = timingsMs.postCrypt = performance.now();
+    switch (compression) {
+      case 0: // No compression
+        payload = decrypted;
+        break;
+      case this.Flags.Brotli:
+        payload = await brotliDecompressAsync(decrypted);
+        break;
+      case this.Flags.Flate:
+        payload = await inflateRawAsync(decrypted);
+        break;
+    }
+    timingsMs.end = timingsMs.postCompress = performance.now();
+
+    if (!payloadIsBuffer) {
+      payload = JSON.parse(payload.toString('utf8'));
+    }
+
+    this.logger.debug(_scope, 'statistics', { version, flags: this._prettyFlags(flags), ...MysteryBox._timingsLog(timingsMs) });
+
+    return payload;
+  }
+
+
+  /**
+   * Pretty-print flag values
+   * @param {Number} flags
+   * @returns {String}
+   */
+  _prettyFlags(flags) {
+    const flagNames = Object.entries(this.Flags).reduce((acc, cur) => {
+      const [flagName, flagValue] = cur;
+      if ((flags & flagValue) === flagValue) {
+        acc.push(flagName);
+      }
+      return acc;
+    }, []);
+    return `0x${flags.toString(16).padStart(2, '0')} [${flagNames.join(',')}]`;
+  }
+
+
+  /**
+   * Everyone loves numbers.
+   * @param {Object} timingsMs
+   * @returns 
+   */
+  static _timingsLog({ start, preCompress, postCompress, preCrypt, postCrypt, end }) {
+    return {
+      totalMs: end - start,
+      compressMs: postCompress - preCompress,
+      cryptMs: postCrypt - preCrypt,
+    };
+  }
+
+}
+
+// Expose for stubbing in tests
+MysteryBox._test = { crypto };
+
+module.exports = MysteryBox;
\ No newline at end of file

diff --git a/lib/version-parameters.js b/lib/version-parameters.js
new file mode 100644 (file)
index 0000000..80a0935
--- /dev/null
+++ b/lib/version-parameters.js
@@ -0,0 +1,48 @@
+'use strict';
+
+/**
+ * Supported packings/cipher types.
+ * To be useful, any cipher included here must be Authenticated Encryption with Additional Data (AEAD).
+ * More preferable versions are numbered higher.
+ */
+const allVersions = {
+  1: {
+    version: 1,
+    algorithm: 'aes-256-gcm',
+    algOptions: {},
+    versionBytes: 1,
+    flagsBytes: 1,
+    ivBytes: 12,
+    saltBytes: 16,
+    tagBytes: 16,
+    keyBytes: 32,
+  },
+  2: {
+    version: 2,
+    algorithm: 'chacha20-poly1305', // Prefer this over NIST because we stan djb
+    algOptions: {
+      authTagLength: 16,
+    },
+    versionBytes: 1,
+    flagsBytes: 1,
+    ivBytes: 12,
+    saltBytes: 16,
+    tagBytes: 16,
+    keyBytes: 32,
+  },
+  3: {
+    version: 3,
+    algorithm: 'xchacha20-poly1305', // Not yet available...
+    algOptions: {
+      authTagLength: 16,
+    },
+    versionBytes: 1,
+    flagsBytes: 1,
+    ivBytes: 24,
+    saltBytes: 16,
+    tagBytes: 16,
+    keyBytes: 32,
+  },
+};
+
+module.exports = allVersions;
\ No newline at end of file

diff --git a/package-lock.json b/package-lock.json
new file mode 100644 (file)
index 0000000..a706af4
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2892 @@
+{
+  "name": "@squeep/mystery-box",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "@babel/compat-data": {
+      "version": "7.15.0",
+      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.15.0.tgz",
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+      "dev": true
+    },
+    "@babel/core": {
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+        "@babel/generator": "^7.15.8",
+        "@babel/helper-compilation-targets": "^7.15.4",
+        "@babel/helper-module-transforms": "^7.15.8",
+        "@babel/helpers": "^7.15.4",
+        "@babel/parser": "^7.15.8",
+        "@babel/template": "^7.15.4",
+        "@babel/traverse": "^7.15.4",
+        "@babel/types": "^7.15.6",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.2",
+        "json5": "^2.1.2",
+        "semver": "^6.3.0",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.15.8",
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+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.14.5"
+          }
+        },
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+          "dev": true
+        }
+      }
+    },
+    "@babel/generator": {
+      "version": "7.15.8",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.15.8.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.15.6",
+        "jsesc": "^2.5.1",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/helper-compilation-targets": {
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+      "dev": true,
+      "requires": {
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+        "browserslist": "^4.16.6",
+        "semver": "^6.3.0"
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+        }
+      }
+    },
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+      "dev": true,
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+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true
+    }
+  }
+}

diff --git a/package.json b/package.json
new file mode 100644 (file)
index 0000000..8839971
--- /dev/null
+++ b/package.json
@@ -0,0 +1,38 @@
+{
+  "name": "@squeep/mystery-box",
+  "version": "1.0.0",
+  "description": "Secure a payload in a web-safe format.",
+  "main": "index.js",
+  "scripts": {
+    "coverage": "nyc npm test",
+    "eslint": "eslint *.js lib",
+    "test": "mocha --recursive"
+  },
+  "engines": {
+    "node": ">=12"
+  },
+  "pre-commit": [
+    "eslint",
+    "coverage"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://git.squeep.com/squeep-mystery-box/"
+  },
+  "keywords": [
+    "encryption",
+    "crypto"
+  ],
+  "author": "Justin Wind <jwind-npm@squeep.com>",
+  "license": "ISC",
+  "devDependencies": {
+    "eslint": "^7.32.0",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-security": "^1.4.0",
+    "eslint-plugin-sonarjs": "^0.10.0",
+    "mocha": "^9.1.2",
+    "nyc": "^15.1.0",
+    "pre-commit": "^1.2.2",
+    "sinon": "^11.1.2"
+  }
+}

diff --git a/test/lib/common.js b/test/lib/common.js
new file mode 100644 (file)
index 0000000..9b4615f
--- /dev/null
+++ b/test/lib/common.js
@@ -0,0 +1,55 @@
+/* eslint-env mocha */
+'use strict';
+
+const assert = require('assert');
+const common = require('../../lib/common');
+
+describe('Common', function () {
+
+  describe('fileScope', function () {
+    it('names a file path', function () {
+      const filename = 'lib/foo/bar.js';
+      const result = common.fileScope(filename)('baz');
+      assert.strictEqual(result, 'bar:baz');
+    });
+    it('names an index path', function () {
+      const filename = 'lib/foo/index.js';
+      const result = common.fileScope(filename)('baz');
+      assert.strictEqual(result, 'foo:baz');
+    });
+  }); // fileScope
+
+  describe('base64ToBase64URL', function () {
+    it('covers', function () {
+      const b64 = '/+==';
+      const expected = '_-';
+      const result = common.base64ToBase64URL(b64);
+      assert.strictEqual(result, expected);
+    });
+  }); // base64ToBase64URL
+
+  describe('base64URLToBase64', function () {
+    it('covers', function () {
+      const b64url = '_-';
+      const expected = '/+==';
+      const result = common.base64URLToBase64(b64url);
+      assert.strictEqual(result, expected);
+    });
+  }); // base64URLToBase64
+
+  describe('base64RePad', function () {
+    it('covers', function () {
+      const b64short = 'af';
+      const expected = 'af==';
+      const result = common.base64RePad(b64short);
+      assert.strictEqual(result, expected);
+    });
+    it('covers padded', function () {
+      const b64 = 'afd4';
+      const expected = b64;
+      const result = common.base64RePad(b64);
+      assert.strictEqual(result, expected);
+    });
+  }); // base64RePad
+
+}); // Common

diff --git a/test/lib/mystery-box.js b/test/lib/mystery-box.js
new file mode 100644 (file)
index 0000000..8d228e6
--- /dev/null
+++ b/test/lib/mystery-box.js
@@ -0,0 +1,166 @@
+/* eslint-env mocha */
+/* eslint-disable capitalized-comments */
+'use strict';
+
+const assert = require('assert');
+const sinon = require('sinon'); // eslint-disable-line node/no-unpublished-require
+const MysteryBox = require('../../lib/mystery-box');
+const stubLogger = require('../stub-logger');
+
+describe('MysteryBox', function () {
+  const noExpectedException = 'did not get expected exception';
+  let mb, options, object;
+  beforeEach(function () {
+    options = {
+      encryptionSecret: 'this is not a very good secret',
+    };
+  });
+  afterEach(function () {
+    sinon.restore();
+  });
+
+  describe('constructor', function () {
+    it('needs a secret', async function () {
+      options = {};
+      try {
+        mb = new MysteryBox(stubLogger, options);
+        assert.fail(noExpectedException);
+      } catch (e) {
+        assert.strictEqual(e.message, 'missing encryption secret', noExpectedException);
+      }
+    });
+
+    it('covers options', function () {
+      try {
+        mb = new MysteryBox(stubLogger);
+        assert.fail(noExpectedException);
+      } catch (e) {
+        assert.strictEqual(e.message, 'missing encryption secret', noExpectedException);
+      }
+    });
+
+    it('covers bad flags', function () {
+      options.defaultFlags = 300;
+      try {
+        mb = new MysteryBox(stubLogger, options);
+        assert.fail(noExpectedException);
+      } catch (e) {
+        assert(e instanceof RangeError, noExpectedException);
+      }
+    });
+
+    it('covers missing ciphers', function () {
+      sinon.stub(MysteryBox._test.crypto, 'getCiphers').returns(['rot13']);
+      try {
+        mb = new MysteryBox(stubLogger, options);
+        assert.fail(noExpectedException);
+      } catch (e) {
+        assert.strictEqual(e.message, 'no supported versions available', noExpectedException);
+      }
+    });
+  }); // constructor
+
+  describe('pack, unpack', function () {
+    beforeEach(function () {
+      mb = new MysteryBox(stubLogger, options);
+    });
+  
+    it('covers packing unsupported version', async function () {
+      try {
+        await mb.pack({}, 0);
+        assert.fail(noExpectedException);
+      } catch (e) {
+        assert(e instanceof RangeError, noExpectedException);
+      }
+    });
+
+    it('covers unpacking unsupported version', async function () {
+      const badBuffer = Buffer.alloc(128);
+      badBuffer.writeUInt8(0, 0); // No such thing as version 0
+      const badPayload = badBuffer.toString('base64');
+      try {
+        await mb.unpack(badPayload);
+        assert.fail(noExpectedException);
+      } catch (e) {
+        assert(e instanceof RangeError, noExpectedException);
+      }
+    });
+
+    it('encrypts and decrypts default version', async function () {
+      this.slow(500);
+      object = {
+        foo: 'bar',
+        baz: 'quux',
+        flarp: 13,
+      };
+      const encryptedResult = await mb.pack(object);
+      const decryptedResult = await mb.unpack(encryptedResult);
+      assert.deepStrictEqual(decryptedResult, object);
+    });
+
+    it('encrypts and decrypts default version, buffer contents', async function () {
+      this.slow(500);
+      object = Buffer.from('a fine little buffer');
+      const encryptedResult = await mb.pack(object);
+      const decryptedResult = await mb.unpack(encryptedResult);
+      assert.deepStrictEqual(decryptedResult, object);
+    });
+
+    it('encrypts and decrypts all available versions +brotli', async function () {
+      Object.keys(mb.versionParameters).map((v) => Number(v)).forEach(async (version) => {
+        object = {
+          foo: 'bar',
+          baz: 'quux',
+          flarp: 13,
+        };
+        const encryptedResult = await mb.pack(object, version, 0x00);
+        const decryptedResult = await mb.unpack(encryptedResult);
+        assert.deepStrictEqual(decryptedResult, object, `${version} results not symmetric`);
+      });
+    });
+
+    it('encrypts and decrypts all available versions +flate', async function () {
+      Object.keys(mb.versionParameters).map((v) => Number(v)).forEach(async (version) => {
+        object = {
+          foo: 'bar',
+          baz: 'quux',
+          flarp: 13,
+        };
+        const encryptedResult = await mb.pack(object, version, 0x01);
+        const decryptedResult = await mb.unpack(encryptedResult);
+        assert.deepStrictEqual(decryptedResult, object, `${version} results not symmetric`);
+      });
+    });
+
+    it('handles large object +brotli', async function () {
+      this.timeout(5000);
+      this.slow(2000);
+      const firstChar = 32, lastChar = 126;
+      const rnd = () => {
+        return Math.floor(firstChar + (lastChar - firstChar + 1) * Math.random());
+      }
+      object = {
+        longProperty: 'x'.repeat(384 * 1024).split('').map(() => String.fromCharCode(rnd())).join(''),
+      };
+      const encryptedResult = await mb.pack(object, mb.bestVersion, 0x00);
+      const decryptedResult = await mb.unpack(encryptedResult);
+      assert.deepStrictEqual(decryptedResult, object);
+    });
+
+    it('handles large object +flate', async function () {
+      this.timeout(5000);
+      this.slow(2000);
+      const firstChar = 32, lastChar = 126;
+      const rnd = () => {
+        return Math.floor(firstChar + (lastChar - firstChar + 1) * Math.random());
+      }
+      object = {
+        longProperty: 'x'.repeat(384 * 1024).split('').map(() => String.fromCharCode(rnd())).join(''),
+      };
+      const encryptedResult = await mb.pack(object, mb.bestVersion, 0x01);
+      const decryptedResult = await mb.unpack(encryptedResult);
+      assert.deepStrictEqual(decryptedResult, object);
+    });
+  }); // pack, unpack
+
+}); // MysteryBox
\ No newline at end of file

diff --git a/test/stub-logger.js b/test/stub-logger.js
new file mode 100644 (file)
index 0000000..5ac0b98
--- /dev/null
+++ b/test/stub-logger.js
@@ -0,0 +1,18 @@
+'use strict';
+
+const sinon = require('sinon'); // eslint-disable-line node/no-unpublished-require
+
+const nop = () => { /* */ };
+const stubLogger = process.env.VERBOSE_TESTS ? console : {
+  debug: nop,
+  error: nop,
+  info: nop,
+};
+stubLogger['_reset'] = () => {
+  sinon.spy(stubLogger, 'debug');
+  sinon.spy(stubLogger, 'error');
+  sinon.spy(stubLogger, 'info');
+},
+
+
+module.exports = stubLogger;
\ No newline at end of file