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const path = require('path');
const bindings = require('node-gyp-build')(path.resolve(__dirname));
const crypto = require('crypto');
const promises = require('./promises');
/// generate a salt (sync)
/// @param {Number} [rounds] number of rounds (default 10)
/// @return {String} salt
function genSaltSync(rounds, minor) {
// default 10 rounds
if (!rounds) {
rounds = 10;
} else if (typeof rounds !== 'number') {
throw new Error('rounds must be a number');
}
if (!minor) {
minor = 'b';
} else if (minor !== 'b' && minor !== 'a') {
throw new Error('minor must be either "a" or "b"');
}
return bindings.gen_salt_sync(minor, rounds, crypto.randomBytes(16));
}
/// generate a salt
/// @param {Number} [rounds] number of rounds (default 10)
/// @param {Function} cb callback(err, salt)
function genSalt(rounds, minor, cb) {
let error;
// if callback is first argument, then use defaults for others
if (typeof arguments[0] === 'function') {
// have to set callback first otherwise arguments are overridden
cb = arguments[0];
rounds = 10;
minor = 'b';
// callback is second argument
} else if (typeof arguments[1] === 'function') {
// have to set callback first otherwise arguments are overridden
cb = arguments[1];
minor = 'b';
}
if (!cb) {
return promises.promise(genSalt, this, [rounds, minor]);
}
// default 10 rounds
if (!rounds) {
rounds = 10;
} else if (typeof rounds !== 'number') {
// callback error asynchronously
error = new Error('rounds must be a number');
return process.nextTick(function () {
cb(error);
});
}
if (!minor) {
minor = 'b'
} else if (minor !== 'b' && minor !== 'a') {
error = new Error('minor must be either "a" or "b"');
return process.nextTick(function () {
cb(error);
});
}
crypto.randomBytes(16, function (error, randomBytes) {
if (error) {
cb(error);
return;
}
bindings.gen_salt(minor, rounds, randomBytes, cb);
});
}
/// hash data using a salt
/// @param {String|Buffer} data the data to encrypt
/// @param {String} salt the salt to use when hashing
/// @return {String} hash
function hashSync(data, salt) {
if (data == null || salt == null) {
throw new Error('data and salt arguments required');
}
if (!(typeof data === 'string' || data instanceof Buffer) || (typeof salt !== 'string' && typeof salt !== 'number')) {
throw new Error('data must be a string or Buffer and salt must either be a salt string or a number of rounds');
}
if (typeof salt === 'number') {
salt = module.exports.genSaltSync(salt);
}
return bindings.encrypt_sync(data, salt);
}
/// hash data using a salt
/// @param {String|Buffer} data the data to encrypt
/// @param {String} salt the salt to use when hashing
/// @param {Function} cb callback(err, hash)
function hash(data, salt, cb) {
let error;
if (typeof data === 'function') {
error = new Error('data must be a string or Buffer and salt must either be a salt string or a number of rounds');
return process.nextTick(function () {
data(error);
});
}
if (typeof salt === 'function') {
error = new Error('data must be a string or Buffer and salt must either be a salt string or a number of rounds');
return process.nextTick(function () {
salt(error);
});
}
// cb exists but is not a function
// return a rejecting promise
if (cb && typeof cb !== 'function') {
return promises.reject(new Error('cb must be a function or null to return a Promise'));
}
if (!cb) {
return promises.promise(hash, this, [data, salt]);
}
if (data == null || salt == null) {
error = new Error('data and salt arguments required');
return process.nextTick(function () {
cb(error);
});
}
if (!(typeof data === 'string' || data instanceof Buffer) || (typeof salt !== 'string' && typeof salt !== 'number')) {
error = new Error('data must be a string or Buffer and salt must either be a salt string or a number of rounds');
return process.nextTick(function () {
cb(error);
});
}
if (typeof salt === 'number') {
return module.exports.genSalt(salt, function (err, salt) {
return bindings.encrypt(data, salt, cb);
});
}
return bindings.encrypt(data, salt, cb);
}
/// compare raw data to hash
/// @param {String|Buffer} data the data to hash and compare
/// @param {String} hash expected hash
/// @return {bool} true if hashed data matches hash
function compareSync(data, hash) {
if (data == null || hash == null) {
throw new Error('data and hash arguments required');
}
if (!(typeof data === 'string' || data instanceof Buffer) || typeof hash !== 'string') {
throw new Error('data must be a string or Buffer and hash must be a string');
}
return bindings.compare_sync(data, hash);
}
/// compare raw data to hash
/// @param {String|Buffer} data the data to hash and compare
/// @param {String} hash expected hash
/// @param {Function} cb callback(err, matched) - matched is true if hashed data matches hash
function compare(data, hash, cb) {
let error;
if (typeof data === 'function') {
error = new Error('data and hash arguments required');
return process.nextTick(function () {
data(error);
});
}
if (typeof hash === 'function') {
error = new Error('data and hash arguments required');
return process.nextTick(function () {
hash(error);
});
}
// cb exists but is not a function
// return a rejecting promise
if (cb && typeof cb !== 'function') {
return promises.reject(new Error('cb must be a function or null to return a Promise'));
}
if (!cb) {
return promises.promise(compare, this, [data, hash]);
}
if (data == null || hash == null) {
error = new Error('data and hash arguments required');
return process.nextTick(function () {
cb(error);
});
}
if (!(typeof data === 'string' || data instanceof Buffer) || typeof hash !== 'string') {
error = new Error('data and hash must be strings');
return process.nextTick(function () {
cb(error);
});
}
return bindings.compare(data, hash, cb);
}
/// @param {String} hash extract rounds from this hash
/// @return {Number} the number of rounds used to encrypt a given hash
function getRounds(hash) {
if (hash == null) {
throw new Error('hash argument required');
}
if (typeof hash !== 'string') {
throw new Error('hash must be a string');
}
return bindings.get_rounds(hash);
}
module.exports = {
genSaltSync,
genSalt,
hashSync,
hash,
compareSync,
compare,
getRounds,
}