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| /*!
* RSA library for Node.js
*
* Copyright (c) 2014 rzcoder
* All Rights Reserved.
*
* License BSD
*/
var constants = require('constants');
var rsa = require('./libs/rsa.js');
var crypt = require('crypto');
var ber = require('asn1').Ber;
var _ = require('./utils')._;
var utils = require('./utils');
var schemes = require('./schemes/schemes.js');
var formats = require('./formats/formats.js');
Iif (typeof constants.RSA_NO_PADDING == "undefined") {
//patch for node v0.10.x, constants do not defined
constants.RSA_NO_PADDING = 3;
}
module.exports = (function () {
var SUPPORTED_HASH_ALGORITHMS = {
node10: ['md4', 'md5', 'ripemd160', 'sha', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512'],
node: ['md4', 'md5', 'ripemd160', 'sha', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512'],
iojs: ['md4', 'md5', 'ripemd160', 'sha', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512'],
browser: ['md5', 'ripemd160', 'sha1', 'sha256', 'sha512']
};
var DEFAULT_ENCRYPTION_SCHEME = 'pkcs1_oaep';
var DEFAULT_SIGNING_SCHEME = 'pkcs1';
var DEFAULT_EXPORT_FORMAT = 'private';
var EXPORT_FORMAT_ALIASES = {
'private': 'pkcs1-private-pem',
'private-der': 'pkcs1-private-der',
'public': 'pkcs8-public-pem',
'public-der': 'pkcs8-public-der',
};
/**
* @param key {string|buffer|object} Key in PEM format, or data for generate key {b: bits, e: exponent}
* @constructor
*/
function NodeRSA(key, format, options) {
if (!(this instanceof NodeRSA)) {
return new NodeRSA(key, format, options);
}
if (_.isObject(format)) {
options = format;
format = undefined;
}
this.$options = {
signingScheme: DEFAULT_SIGNING_SCHEME,
signingSchemeOptions: {
hash: 'sha256',
saltLength: null
},
encryptionScheme: DEFAULT_ENCRYPTION_SCHEME,
encryptionSchemeOptions: {
hash: 'sha1',
label: null
},
environment: utils.detectEnvironment(),
rsaUtils: this
};
this.keyPair = new rsa.Key();
this.$cache = {};
if (Buffer.isBuffer(key) || _.isString(key)) {
this.importKey(key, format);
} else if (_.isObject(key)) {
this.generateKeyPair(key.b, key.e);
}
this.setOptions(options);
}
/**
* Set and validate options for key instance
* @param options
*/
NodeRSA.prototype.setOptions = function (options) {
options = options || {};
if (options.environment) {
this.$options.environment = options.environment;
}
if (options.signingScheme) {
if (_.isString(options.signingScheme)) {
var signingScheme = options.signingScheme.toLowerCase().split('-');
if (signingScheme.length == 1) {
if (SUPPORTED_HASH_ALGORITHMS.node.indexOf(signingScheme[0]) > -1) {
this.$options.signingSchemeOptions = {
hash: signingScheme[0]
};
this.$options.signingScheme = DEFAULT_SIGNING_SCHEME;
} else {
this.$options.signingScheme = signingScheme[0];
this.$options.signingSchemeOptions = {
hash: null
};
}
} else {
this.$options.signingSchemeOptions = {
hash: signingScheme[1]
};
this.$options.signingScheme = signingScheme[0];
}
} else if (_.isObject(options.signingScheme)) {
this.$options.signingScheme = options.signingScheme.scheme || DEFAULT_SIGNING_SCHEME;
this.$options.signingSchemeOptions = _.omit(options.signingScheme, 'scheme');
}
if (!schemes.isSignature(this.$options.signingScheme)) {
throw Error('Unsupported signing scheme');
}
if (this.$options.signingSchemeOptions.hash &&
SUPPORTED_HASH_ALGORITHMS[this.$options.environment].indexOf(this.$options.signingSchemeOptions.hash) === -1) {
throw Error('Unsupported hashing algorithm for ' + this.$options.environment + ' environment');
}
}
if (options.encryptionScheme) {
if (_.isString(options.encryptionScheme)) {
this.$options.encryptionScheme = options.encryptionScheme.toLowerCase();
this.$options.encryptionSchemeOptions = {};
} else if (_.isObject(options.encryptionScheme)) {
this.$options.encryptionScheme = options.encryptionScheme.scheme || DEFAULT_ENCRYPTION_SCHEME;
this.$options.encryptionSchemeOptions = _.omit(options.encryptionScheme, 'scheme');
}
if (!schemes.isEncryption(this.$options.encryptionScheme)) {
throw Error('Unsupported encryption scheme');
}
if (this.$options.encryptionSchemeOptions.hash &&
SUPPORTED_HASH_ALGORITHMS[this.$options.environment].indexOf(this.$options.encryptionSchemeOptions.hash) === -1) {
throw Error('Unsupported hashing algorithm for ' + this.$options.environment + ' environment');
}
}
this.keyPair.setOptions(this.$options);
};
/**
* Generate private/public keys pair
*
* @param bits {int} length key in bits. Default 2048.
* @param exp {int} public exponent. Default 65537.
* @returns {NodeRSA}
*/
NodeRSA.prototype.generateKeyPair = function (bits, exp) {
bits = bits || 2048;
exp = exp || 65537;
if (bits % 8 !== 0) {
throw Error('Key size must be a multiple of 8.');
}
this.keyPair.generate(bits, exp.toString(16));
this.$cache = {};
return this;
};
/**
* Importing key
* @param keyData {string|buffer|Object}
* @param format {string}
*/
NodeRSA.prototype.importKey = function (keyData, format) {
if (!keyData) {
throw Error("Empty key given");
}
if (format) {
format = EXPORT_FORMAT_ALIASES[format] || format;
}
if (!formats.detectAndImport(this.keyPair, keyData, format) && format === undefined) {
throw Error("Key format must be specified");
}
this.$cache = {};
};
/**
* Exporting key
* @param [format] {string}
*/
NodeRSA.prototype.exportKey = function (format) {
format = format || DEFAULT_EXPORT_FORMAT;
format = EXPORT_FORMAT_ALIASES[format] || format;
if (!this.$cache[format]) {
this.$cache[format] = formats.detectAndExport(this.keyPair, format);
}
return this.$cache[format];
};
/**
* Check if key pair contains private key
*/
NodeRSA.prototype.isPrivate = function () {
return this.keyPair.isPrivate();
};
/**
* Check if key pair contains public key
* @param [strict] {boolean} - public key only, return false if have private exponent
*/
NodeRSA.prototype.isPublic = function (strict) {
return this.keyPair.isPublic(strict);
};
/**
* Check if key pair doesn't contains any data
*/
NodeRSA.prototype.isEmpty = function (strict) {
return !(this.keyPair.n || this.keyPair.e || this.keyPair.d);
};
/**
* Encrypting data method with public key
*
* @param buffer {string|number|object|array|Buffer} - data for encrypting. Object and array will convert to JSON string.
* @param encoding {string} - optional. Encoding for output result, may be 'buffer', 'binary', 'hex' or 'base64'. Default 'buffer'.
* @param source_encoding {string} - optional. Encoding for given string. Default utf8.
* @returns {string|Buffer}
*/
NodeRSA.prototype.encrypt = function (buffer, encoding, source_encoding) {
return this.$$encryptKey(false, buffer, encoding, source_encoding);
};
/**
* Decrypting data method with private key
*
* @param buffer {Buffer} - buffer for decrypting
* @param encoding - encoding for result string, can also take 'json' or 'buffer' for the automatic conversion of this type
* @returns {Buffer|object|string}
*/
NodeRSA.prototype.decrypt = function (buffer, encoding) {
return this.$$decryptKey(false, buffer, encoding);
};
/**
* Encrypting data method with private key
*
* Parameters same as `encrypt` method
*/
NodeRSA.prototype.encryptPrivate = function (buffer, encoding, source_encoding) {
return this.$$encryptKey(true, buffer, encoding, source_encoding);
};
/**
* Decrypting data method with public key
*
* Parameters same as `decrypt` method
*/
NodeRSA.prototype.decryptPublic = function (buffer, encoding) {
return this.$$decryptKey(true, buffer, encoding);
};
/**
* Encrypting data method with custom key
*/
NodeRSA.prototype.$$encryptKey = function (usePrivate, buffer, encoding, source_encoding) {
try {
var res = this.keyPair.encrypt(this.$getDataForEncrypt(buffer, source_encoding), usePrivate);
if (encoding == 'buffer' || !encoding) {
return res;
} else {
return res.toString(encoding);
}
} catch (e) {
throw Error('Error during encryption. Original error: ' + e);
}
};
/**
* Decrypting data method with custom key
*/
NodeRSA.prototype.$$decryptKey = function (usePublic, buffer, encoding) {
try {
buffer = _.isString(buffer) ? new Buffer(buffer, 'base64') : buffer;
var res = this.keyPair.decrypt(buffer, usePublic);
if (res === null) {
throw Error('Key decrypt method returns null.');
}
return this.$getDecryptedData(res, encoding);
} catch (e) {
throw Error('Error during decryption (probably incorrect key). Original error: ' + e);
}
};
/**
* Signing data
*
* @param buffer {string|number|object|array|Buffer} - data for signing. Object and array will convert to JSON string.
* @param encoding {string} - optional. Encoding for output result, may be 'buffer', 'binary', 'hex' or 'base64'. Default 'buffer'.
* @param source_encoding {string} - optional. Encoding for given string. Default utf8.
* @returns {string|Buffer}
*/
NodeRSA.prototype.sign = function (buffer, encoding, source_encoding) {
if (!this.isPrivate()) {
throw Error("This is not private key");
}
var res = this.keyPair.sign(this.$getDataForEncrypt(buffer, source_encoding));
if (encoding && encoding != 'buffer') {
res = res.toString(encoding);
}
return res;
};
/**
* Verifying signed data
*
* @param buffer - signed data
* @param signature
* @param source_encoding {string} - optional. Encoding for given string. Default utf8.
* @param signature_encoding - optional. Encoding of given signature. May be 'buffer', 'binary', 'hex' or 'base64'. Default 'buffer'.
* @returns {*}
*/
NodeRSA.prototype.verify = function (buffer, signature, source_encoding, signature_encoding) {
if (!this.isPublic()) {
throw Error("This is not public key");
}
signature_encoding = (!signature_encoding || signature_encoding == 'buffer' ? null : signature_encoding);
return this.keyPair.verify(this.$getDataForEncrypt(buffer, source_encoding), signature, signature_encoding);
};
/**
* Returns key size in bits
* @returns {int}
*/
NodeRSA.prototype.getKeySize = function () {
return this.keyPair.keySize;
};
/**
* Returns max message length in bytes (for 1 chunk) depending on current encryption scheme
* @returns {int}
*/
NodeRSA.prototype.getMaxMessageSize = function () {
return this.keyPair.maxMessageLength;
};
/**
* Preparing given data for encrypting/signing. Just make new/return Buffer object.
*
* @param buffer {string|number|object|array|Buffer} - data for encrypting. Object and array will convert to JSON string.
* @param encoding {string} - optional. Encoding for given string. Default utf8.
* @returns {Buffer}
*/
NodeRSA.prototype.$getDataForEncrypt = function (buffer, encoding) {
if (_.isString(buffer) || _.isNumber(buffer)) {
return new Buffer('' + buffer, encoding || 'utf8');
} else if (Buffer.isBuffer(buffer)) {
return buffer;
} else if (_.isObject(buffer)) {
return new Buffer(JSON.stringify(buffer));
} else {
throw Error("Unexpected data type");
}
};
/**
*
* @param buffer {Buffer} - decrypted data.
* @param encoding - optional. Encoding for result output. May be 'buffer', 'json' or any of Node.js Buffer supported encoding.
* @returns {*}
*/
NodeRSA.prototype.$getDecryptedData = function (buffer, encoding) {
encoding = encoding || 'buffer';
if (encoding == 'buffer') {
return buffer;
} else if (encoding == 'json') {
return JSON.parse(buffer.toString());
} else {
return buffer.toString(encoding);
}
};
return NodeRSA;
})();
|