diff options
Diffstat (limited to 'deps/npm/node_modules/cryptiles/lib/index.js')
-rwxr-xr-x | deps/npm/node_modules/cryptiles/lib/index.js | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/deps/npm/node_modules/cryptiles/lib/index.js b/deps/npm/node_modules/cryptiles/lib/index.js new file mode 100755 index 0000000000..511eab66d4 --- /dev/null +++ b/deps/npm/node_modules/cryptiles/lib/index.js @@ -0,0 +1,88 @@ +'use strict'; + +// Load modules + +const Crypto = require('crypto'); +const Boom = require('boom'); + + +// Declare internals + +const internals = {}; + + +// Generate a cryptographically strong pseudo-random data + +exports.randomString = function (size) { + + const buffer = exports.randomBits((size + 1) * 6); + if (buffer instanceof Error) { + return buffer; + } + + const string = buffer.toString('base64').replace(/\+/g, '-').replace(/\//g, '_').replace(/\=/g, ''); + return string.slice(0, size); +}; + + +// Return a random string of digits + +exports.randomDigits = function (size) { + + const buffer = exports.randomBits(size * 8); + if (buffer instanceof Error) { + return buffer; + } + + const digits = []; + for (let i = 0; i < buffer.length; ++i) { + digits.push(Math.floor(buffer[i] / 25.6)); + } + + return digits.join(''); +}; + + +// Generate a buffer of random bits + +exports.randomBits = function (bits) { + + if (!bits || + bits < 0) { + + return Boom.internal('Invalid random bits count'); + } + + const bytes = Math.ceil(bits / 8); + try { + return Crypto.randomBytes(bytes); + } + catch (err) { + return Boom.internal('Failed generating random bits: ' + err.message); + } +}; + + +// Compare two strings using fixed time algorithm (to prevent time-based analysis of MAC digest match) + +exports.fixedTimeComparison = function (a, b) { + + if (typeof a !== 'string' || + typeof b !== 'string') { + + return false; + } + + let mismatch = (a.length === b.length ? 0 : 1); + if (mismatch) { + b = a; + } + + for (let i = 0; i < a.length; ++i) { + const ac = a.charCodeAt(i); + const bc = b.charCodeAt(i); + mismatch |= (ac ^ bc); + } + + return (mismatch === 0); +}; |