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2062 lines (1757 loc) · 41.5 KB
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const bcrypt = require('bcrypt');
const crypto = require('crypto');
const sodium = require('libsodium-wrappers-sumo');
const extcrypto = require('./extcrypto');
// Constants
const HASHBYTES = { sha256: 32, sha384: 48, sha512: 64 };
const AESKEYS = [ 128, 192, 256 ];
/************************
* Variant Constructors *
************************/
/***
* rsasign
*
* rsa constructor
*
* @function
* @api private
*
* @param {String} padding
* @param {String} digest
* @returns {Function}
*/
function rsasign(digest, padding) {
if (Object.keys(HASHBYTES).indexOf(digest) === -1) { throw new Error('Unknown hashing algorithm'); }
let algorithm;
switch (padding) {
case 'pss':
algorithm = crypto.constants.RSA_PKCS1_PSS_PADDING;
break;
case 'v1_5':
algorithm = crypto.constants.RSA_PKCS1_PADDING;
break;
default:
throw new Error('Unknown padding method');
}
/***
* keying
*
* get an rsa key
*
* @function
* @api private
*
* @param {String|Buffer} provided
* @param {Function} cb
* @returns {Callback|Promise}
*/
function keying(provided) {
return new Promise((resolve, reject) => {
if (provided) { return resolve(provided); }
extcrypto.keygen((err, sk) => {
if (err) { return reject(err); }
return resolve(sk);
});
});
}
/***
* `lambda`
*
* sign a payload
*
* @function
* @api private
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (message, sk, cb) => {
if (typeof sk === 'function') {
cb = sk;
sk = null;
}
const done = ret(cb);
let payload;
[ payload ] = iparse(message);
return keying(sk).then((isk) => {
if (!isk) { return done(new Error('Unable to generate key')); }
// for pss tests, should crypto api change in the future to allow specifying salt
//let salt;
//if (typeof isk === 'object' && padding === crypto.constants.RSA_PKCS1_PSS_PADDING) {
// salt = isk.salt;
// isk = isk.sk;
//}
let signature;
try {
const alg = ('rsa-' + digest).toUpperCase();
const sign = crypto.createSign(alg);
sign.update(message);
sign.end();
signature = sign.sign({ key: isk, padding: algorithm });
} catch(ex) {
return done(new Error('Crypto error: ' + ex));
}
return done(null, convert({
alg: 'rsa' + padding + '-' + digest,
sk: isk,
payload: payload,
signature: signature
}));
}).catch((err) => { return done(err); });
}
}
/***
* rsaverify
*
* rsa constructor
*
* @function
* @api private
*
* @param {String} padding
* @param {String} digest
* @returns {Function}
*/
function rsaverify(digest, padding) {
if (Object.keys(HASHBYTES).indexOf(digest) === -1) { throw new Error('Unknown hashing algorithm'); }
let algorithm;
switch (padding) {
case 'pss':
algorithm = crypto.constants.RSA_PKCS1_PSS_PADDING;
break;
case 'v1_5':
algorithm = crypto.constants.RSA_PKCS1_PADDING;
break;
default:
throw new Error('Unknown padding method');
}
/***
* keying
*
* get an rsa public key, if necessary from private key
*
* @function
* @api private
*
* @param {String|Buffer} key
* @param {Function} cb
* @returns {Callback|Promise}
*/
function keying(key) {
return new Promise((resolve, reject) => {
if (key.startsWith('-----BEGIN PUBLIC KEY-----')) { return resolve(key); }
if (key.startsWith('-----BEGIN RSA PUBLIC KEY-----')) { return resolve(key); }
if (!key.startsWith('-----BEGIN RSA PRIVATE KEY-----')) { return reject(new Error('Invalid key formatting')); }
extcrypto.extract(key, (err, pkey) => {
if (err) { return reject(err); }
return resolve(pkey);
});
});
}
/***
* `lambda`
*
* verify a signature
*
* @function
* @api private
*
* @param {String|Buffer} message
* @param {String|Buffer} pk
* @param {String|Buffer} signature
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (message, pk, signature, cb) => {
if (typeof pk === 'function') {
cb = pk;
pk = null;
}
const done = ret(cb);
if (!pk) { return done(new Error('Cannot verify without a key')); }
let payload, received, ipk;
[ payload ] = iparse(message);
[ received ] = cparse(signature);
return keying(pk).then((ipk) => {
if (!ipk) { return done(new Error('Unable to load key')); }
let verified;
try {
const alg = ('rsa-' + digest).toUpperCase();
const verify = crypto.createVerify(alg);
verify.update(message);
verify.end();
verified = verify.verify({ key: ipk, padding: algorithm }, received);
} catch(ex) {
return done(new Error('Crypto error: ' + ex));
}
if (!verified) { return done(new Error('Invalid signature')); }
return done();
}).catch((err) => { return done(err); });
}
}
/***
* mac
*
* mac constructor
*
* @function
* @api private
*
* @param {String} algorithm
* @returns {Function}
*/
function mac(algorithm) {
if (Object.keys(HASHBYTES).indexOf(algorithm) === -1) { throw new Error('Unknown hashing algorithm'); }
/***
* `lambda`
*
* mac a payload
*
* @function
* @api private
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (message, sk, cb) => {
if (typeof sk === 'function') {
cb = sk;
sk = null;
}
const done = ret(cb);
// https://tools.ietf.org/html/rfc2104#section-3
if (!sk) { sk = crypto.randomBytes(HASHBYTES[algorithm]); }
let payload, isk;
[ payload ] = iparse(message);
[ sk ] = cparse(sk);
isk = sk;
let mac;
try {
mac = crypto.createHmac(algorithm, isk).update(message).digest();
} catch(ex) {
return done(new Error('Crypto error: ' + ex));
}
return done(null, convert({
alg: 'hmac' + algorithm,
sk: sk,
payload: payload,
mac: mac
}));
}
}
/***
* vmac
*
* mac verifier constructor
*
* @function
* @api private
*
* @param {String} algorithm
* @returns {Function}
*/
function vmac(algorithm) {
if (Object.keys(HASHBYTES).indexOf(algorithm) === -1) { throw new Error('Unknown hashing algorithm'); }
/***
* `lambda`
*
* verify a mac
*
* @function
* @api private
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {String|Buffer} mac
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (message, sk, tag, cb) => {
const done = ret(cb);
if (!sk) { return done(new Error('Cannot verify without a key')); }
let payload, received, isk;
[ payload ] = iparse(message);
[ sk, received ] = cparse(sk, tag);
isk = sk;
let mac, verified;
try {
mac = crypto.createHmac(algorithm, isk).update(message).digest();
verified = cnstcomp(mac, received);
} catch(ex) {
return done(new Error('Crypto error: ' + ex));
}
if (!verified) { return done(new Error('Invalid mac')); }
return done();
}
}
/***
* cbc
*
* aes-cbc-hmac encryption constructor
*
* @function
* @api private
* @param {String} digest
* @param {String} keysize
* @returns {Function}
*/
function cbc(digest, keysize) {
if (Object.keys(HASHBYTES).indexOf(digest) === -1) { throw new Error('Unknown hashing algorithm'); }
if (AESKEYS.indexOf(keysize) === -1) { throw new Error('Invalid key size'); }
/***
* `lambda`
*
* encrypt-then-authenticate a plaintext
*
* @function
* @api private
*
* @param {String|Buffer} message
* @param {String|Buffer} ek
* @param {String|Buffer} ak
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (message, ek, ak, cb) => {
if (typeof ek === 'function') {
cb = ek;
ek = null;
ak = null;
}
const done = ret(cb);
if (!!ek ^ !!ak) { return done(new Error('Requires both or neither of encryption and authentication keys')); }
// Undocumented functionality to allow specifying iv for tests.
let iv;
if (ek && typeof ek === 'object' && !(ek instanceof Buffer)) {
iv = ek.iv;
ek = ek.key;
}
let payload, iek, iak;
[ payload ] = iparse(message);
[ ek, ak, iv ] = cparse(ek, ak, iv);
if (!ek) {
ek = crypto.randomBytes(keysize / 8);
ak = crypto.randomBytes(HASHBYTES[digest]);
}
iek = ek;
iak = ak;
let ciphertext, mac;
try {
iv = iv || crypto.randomBytes(16);
const cipher = crypto.createCipheriv('aes-' + keysize + '-cbc', iek, iv);
const hmac = crypto.createHmac(digest, iak);
ciphertext = Buffer.concat([ cipher.update(payload), cipher.final() ]);
hmac.update(Buffer.concat([ iv, ciphertext ]));
mac = hmac.digest();
} catch (ex) {
return done(new Error('Crypto error: ' + ex));
}
return done(null, convert({
alg: 'aes' + keysize + 'cbc-hmac' + digest,
sek: ek,
sak: ak,
payload: payload,
iv: iv,
ciphertext: ciphertext,
mac: mac
}));
}
}
/***
* dcbc
*
* aes-cbc-hmac decryption constructor
*
* @function
* @api private
* @param {String} digest
* @param {String} keysize
* @returns {Function}
*/
function dcbc(digest, keysize) {
if (Object.keys(HASHBYTES).indexOf(digest) === -1) { throw new Error('Unknown hashing algorithm'); }
if (AESKEYS.indexOf(keysize) === -1) { throw new Error('Invalid key size'); }
/***
* `lambda`
*
* verify-then-decrypt a ciphertext
*
* @function
* @api private
*
* @param {String|Buffer} ek
* @param {String|Buffer} ak
* @param {String|Buffer} iv
* @param {String|Buffer} ciphertext
* @param {String|Buffer} mac
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (ek, ak, iv, ciphertext, mac, cb) => {
const done = ret(cb);
if (!ek || !ak) { return done(new Error('Cannot decrypt without encryption and authentication keys')); }
let iek, iak;
[ ek, ak, iv, ciphertext, mac ] = cparse(ek, ak, iv, ciphertext, mac);
iek = ek;
iak = ak;
let plaintext;
try {
const cipher = crypto.createDecipheriv('aes-' + keysize + '-cbc', iek, iv);
const hmac = crypto.createHmac(digest, iak);
hmac.update(Buffer.concat([ iv, ciphertext ]));
const received = hmac.digest();
if (!cnstcomp(received, mac)) { return done(new Error('Invalid mac')); }
plaintext = Buffer.concat([ cipher.update(ciphertext), cipher.final() ]);
} catch (ex) {
return done(new Error('Crypto error: ' + ex));
}
return done(null, convert(plaintext));
}
}
/***
* gcm
*
* aes-gcm encryption constructor
*
* @function
* @api private
* @param {String} keysize
* @returns {Function}
*/
function gcm(keysize) {
if (AESKEYS.indexOf(keysize) === -1) { throw new Error('Invalid key size'); }
/***
* `lambda`
*
* aead encrypt a plaintext
*
* @function
* @api private
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (message, sk, cb) => {
if (typeof sk === 'function') {
cb = sk;
sk = null;
}
const done = ret(cb);
// Undocumented functionality to allow specifying iv for tests.
let iv;
if (sk && typeof sk === 'object' && !(sk instanceof Buffer)) {
iv = sk.iv;
sk = sk.key;
}
let payload, isk;
[ payload ] = iparse(message);
[ sk, iv ] = cparse(sk, iv);
if (!sk) { sk = crypto.randomBytes(keysize / 8); }
isk = sk;
let ciphertext, tag;
try {
iv = iv || crypto.randomBytes(12);
const cipher = crypto.createCipheriv('aes-' + keysize + '-gcm', sk, iv);
ciphertext = Buffer.concat([ cipher.update(payload), cipher.final() ]);
tag = cipher.getAuthTag();
} catch (ex) {
return done(new Error('Crypto error: ' + ex));
}
return done(null, convert({
alg: 'aes' + keysize + 'gcm',
sk: sk,
payload: payload,
iv: iv,
ciphertext: ciphertext,
tag: tag
}));
}
}
/***
* dgcm
*
* aes-gcm decryption constructor
*
* @function
* @api private
* @param {String} keysize
* @returns {Function}
*/
function dgcm(keysize) {
if (AESKEYS.indexOf(keysize) === -1) { throw new Error('Invalid key size'); }
/***
* `lambda`
*
* aead decrypt a ciphertext
*
* @function
* @api private
*
* @param {String|Buffer} sk
* @param {String|Buffer} iv
* @param {String|Buffer} ciphertext
* @param {String|Buffer} tag
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (sk, iv, ciphertext, tag, cb) => {
const done = ret(cb);
if (!sk) { return done(new Error('Cannot decrypt without a key')); }
let isk;
[ sk, iv, ciphertext, tag ] = cparse(sk, iv, ciphertext, tag);
isk = sk;
let plaintext;
try {
const cipher = crypto.createDecipheriv('aes-' + keysize + '-gcm', isk, iv);
cipher.setAuthTag(tag);
plaintext = Buffer.concat([ cipher.update(ciphertext), cipher.final() ]);
} catch (ex) {
return done(new Error('Crypto error: ' + ex));
}
return done(null, convert(plaintext));
}
}
/***
* hash
*
* hash constructor
*
* @function
* @api private
*
* @param {String} algorithm
* @returns {Function}
*/
function hash(algorithm) {
if (Object.keys(HASHBYTES).indexOf(algorithm) === -1) { throw new Error('Unknown hashing algorithm'); }
/***
* `lambda`
*
* hash a payload
*
* @function
* @api private
*
* @param {String|Buffer} message
* @param {Function} cb
* @returns {Callback|Promise}
*/
return (message, cb) => {
const done = ret(cb);
let payload;
[ payload ] = iparse(message);
let hash;
try {
hash = crypto.createHash(algorithm).update(message).digest();
} catch(ex) {
return done(new Error('Crypto error: ' + ex));
}
return done(null, convert({
alg: algorithm,
payload: payload,
hash: hash
}));
}
}
/************
* Core API *
************/
exports = module.exports = new Object();
module.exports.auth = new Object();
module.exports.verify = new Object();
module.exports.encrypt = new Object();
module.exports.decrypt = new Object();
module.exports.password = new Object();
module.exports.util = new Object();
/***
* auth.sign
*
* sign a payload
*
* @function
* @api public
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {Function} cb
* @returns {Callback|Promise}
*/
module.exports.auth.sign = (m, s, cb) => { return sodium.ready.then(() => { return sign(m, s, cb); } ) }
function sign(message, sk, cb) {
if (typeof sk === 'function') {
cb = sk;
sk = null;
}
const done = ret(cb);
let payload, isk;
[ payload ] = iparse(message);
[ sk ] = cparse(sk);
switch (sk && Buffer.byteLength(sk)) {
case sodium.crypto_sign_SECRETKEYBYTES:
isk = sk;
break;
case sodium.crypto_sign_SEEDBYTES:
isk = sodium.crypto_sign_seed_keypair(sk).privateKey;
break;
default:
isk = sodium.crypto_sign_keypair().privateKey;
sk = sodium.crypto_sign_ed25519_sk_to_seed(isk);
}
let signature;
try {
signature = sodium.crypto_sign_detached(payload, isk);
} catch(ex) {
return done(new Error('Libsodium error: ' + ex));
}
return done(null, convert({
alg: 'ed25519',
sk: sk,
payload: payload,
signature: signature
}));
}
/***
* verify.sign
*
* verify a signature
*
* @function
* @api public
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {String|Buffer} signature
* @param {Boolean} issk
* @param {Function} cb
* @returns {Callback|Promise}
*/
module.exports.verify.sign = (m, p, s, i, cb) => { return sodium.ready.then(() => { return vsign(m, p, s, i, cb); } ) }
function vsign(message, pk, signature, ispk, cb) {
if (typeof ispk === 'function') {
cb = ispk;
ispk = false;
}
const done = ret(cb);
if (!pk) { return done(new Error('Cannot verify without a key')); }
let payload, received, ipk;
[ payload ] = iparse(message);
[ pk, received ] = cparse(pk, signature);
ipk = (ispk) ? pk : sodium.crypto_sign_seed_keypair(pk).publicKey;
let verified;
try {
verified = sodium.crypto_sign_verify_detached(received, payload, ipk);
} catch(ex) {
return done(new Error('Libsodium error: ' + ex));
}
if (!verified) { return done(new Error('Invalid signature')); }
return done();
}
/***
* auth.mac
*
* mac a payload
*
* @function
* @api public
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {Function} cb
* @returns {Callback|Promise}
*/
module.exports.auth.mac = mac('sha384');
/***
* verify.mac
*
* verify a mac
*
* @function
* @api public
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {String|Buffer} mac
* @param {Function} cb
* @returns {Callback|Promise}
*/
module.exports.verify.mac = vmac('sha384');
/***
* encrypt.async
*
* symmetric authenticated encryption of a payload
*
* @function
* @api public
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {String|Buffer} pk
* @param {Function} cb
* @returns {Callback|Promise}
*/
module.exports.encrypt.async = (m, s, p, cb) => { return sodium.ready.then(() => { return async(m, s, p, cb); } ) };
function async(message, sk, pk, cb) {
if (typeof sk === 'function') {
cb = sk;
sk = null;
pk = null;
}
const done = ret(cb);
if (!!sk ^ !!pk) { return done(new Error('Requires both or neither of private and public keys')); }
// Undocumented functionality to allow specifying nonce for tests.
let nonce;
if (sk && typeof sk === 'object' && !(sk instanceof Buffer)) {
nonce = sk.nonce;
sk = sk.key;
}
let payload, isk, ipk;
[ payload ] = iparse(message);
[ sk, pk, nonce ] = cparse(sk, pk, nonce);
if (!sk) {
const keys = sodium.crypto_box_keypair();
sk = keys.privateKey;
pk = keys.publicKey;
}
isk = sk;
ipk = pk;
let ciphertext;
try {
nonce = nonce || sodium.randombytes_buf(sodium.crypto_box_NONCEBYTES);
ciphertext = sodium.crypto_box_easy(payload, nonce, ipk, isk);
} catch(ex) {
return done(new Error('Libsodium error: ' + ex));
}
return done(null, convert({
alg: 'x25519-xsalsa20poly1305',
sk: sk,
pk: pk,
payload: payload,
nonce: nonce,
ciphertext: ciphertext
}));
}
/***
* decrypt.async
*
* asymmetric authenticated decryption of a payload
*
* @function
* @api public
*
* @param {String|Buffer} sk
* @param {String|Buffer} pk
* @param {String|Buffer} ciphertext
* @param {String|Buffer} nonce
* @param {Function} cb
* @returns {Callback|Promise}
*/
module.exports.decrypt.async = (s, p, c, n, cb) => { return sodium.ready.then(() => { return dasync(s, p, c, n, cb); } ) };
function dasync(sk, pk, ciphertext, nonce, cb) {
const done = ret(cb);
if (!sk || !pk) { return done(new Error('Cannot decrypt without both private and public keys')); }
let isk, ipk;
[ ciphertext, nonce, sk, pk ] = cparse(ciphertext, nonce, sk, pk);
isk = sk;
ipk = pk;
let plaintext;
try {
plaintext = sodium.crypto_box_open_easy(ciphertext, nonce, ipk, isk);
} catch(ex) {
return done(new Error('Libsodium error: ' + ex));
}
return done(null, convert(plaintext));
}
/***
* encrypt.sync
*
* symmetric authenticated encryption of a payload
*
* @function
* @api public
*
* @param {String|Buffer} message
* @param {String|Buffer} sk
* @param {Function} cb
* @returns {Callback|Promise}
*/
module.exports.encrypt.sync = (m, s, cb) => { return sodium.ready.then(() => { return sync(m, s, cb); } ) };
function sync(message, sk, cb) {
if (typeof sk === 'function') {
cb = sk;
sk = null;
}
const done = ret(cb);
// Undocumented functionality to allow specifying nonce for tests.
let nonce;
if (sk && typeof sk === 'object' && !(sk instanceof Buffer)) {
nonce = sk.nonce;
sk = sk.key;
}
let payload, isk;
[ payload ] = iparse(message);
[ sk, nonce ] = cparse(sk, nonce);
if (!sk) { sk = sodium.crypto_secretbox_keygen(); }
isk = sk;
let ciphertext;
try {
nonce = nonce || sodium.randombytes_buf(sodium.crypto_secretbox_NONCEBYTES);
ciphertext = sodium.crypto_secretbox_easy(payload, nonce, isk);
} catch(ex) {
return done(new Error('Libsodium error: ' + ex));
}
return done(null, convert({
alg: 'xsalsa20poly1305',
sk: sk,
payload: payload,
nonce: nonce,
ciphertext: ciphertext
}));
}
/***
* decrypt.sync
*
* symmetric authenticated decryption of a payload
*
* @function
* @api public
*
* @param {String|Buffer} sk
* @param {String|Buffer} pk
* @param {String|Buffer} ciphertext
* @param {String|Buffer} nonce
* @param {Function} cb
* @returns {Callback|Promise}
*/
module.exports.decrypt.sync = (s, c, n, cb) => { return sodium.ready.then(() => { return dsync(s, c, n, cb); } ) };;
function dsync(sk, ciphertext, nonce, cb) {
const done = ret(cb);
if (!sk) { return done(new Error('Cannot decrypt without a key')); }
let isk;
[ ciphertext, nonce, sk ] = cparse(ciphertext, nonce, sk);
isk = sk;