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@@ -1,183 +1,148 @@
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/**
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* PKCS1 padding and signature scheme
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*/
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var ber = require('asn1').Ber;
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var _ = require('../utils')._;
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var utils = require('../utils');
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var BigInteger = require('../libs/jsbn');
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var crypt = require('crypto');
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var SIGN_INFO_HEAD = {
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md2: Buffer.from('3020300c06082a864886f70d020205000410', 'hex'),
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md5: Buffer.from('3020300c06082a864886f70d020505000410', 'hex'),
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sha1: Buffer.from('3021300906052b0e03021a05000414', 'hex'),
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sha224: Buffer.from('302d300d06096086480165030402040500041c', 'hex'),
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sha256: Buffer.from('3031300d060960864801650304020105000420', 'hex'),
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sha384: Buffer.from('3041300d060960864801650304020205000430', 'hex'),
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sha512: Buffer.from('3051300d060960864801650304020305000440', 'hex'),
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ripemd160: Buffer.from('3021300906052b2403020105000414', 'hex'),
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rmd160: Buffer.from('3021300906052b2403020105000414', 'hex')
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};
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var SIGN_ALG_TO_HASH_ALIASES = {
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'ripemd160': 'rmd160'
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};
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var DEFAULT_HASH_FUNCTION = 'sha256';
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module.exports = {
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isEncryption: true,
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isSignature: true
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};
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module.exports.makeScheme = function (key, options) {
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function Scheme(key, options) {
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this.key = key;
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this.options = options;
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}
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Scheme.prototype.maxMessageLength = function () {
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if (this.options.encryptionSchemeOptions && this.options.encryptionSchemeOptions.padding == 3) {
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return this.key.encryptedDataLength;
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}
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return this.key.encryptedDataLength - 11;
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};
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/**
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* Pad input Buffer to encryptedDataLength bytes, and return Buffer.from
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* alg: PKCS#1
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* @param buffer
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* @returns {Buffer}
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*/
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Scheme.prototype.encPad = function (buffer, options) {
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options = options || {};
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var filled;
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if (buffer.length > this.key.maxMessageLength) {
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throw new Error("Message too long for RSA (n=" + this.key.encryptedDataLength + ", l=" + buffer.length + ")");
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}
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if (this.options.encryptionSchemeOptions && this.options.encryptionSchemeOptions.padding == 3) {
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//RSA_NO_PADDING treated like JAVA left pad with zero character
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filled = Buffer.alloc(this.key.maxMessageLength - buffer.length);
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filled.fill(0);
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return Buffer.concat([filled, buffer]);
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}
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/* Type 1: zeros padding for private key encrypt */
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if (options.type === 1) {
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filled = Buffer.alloc(this.key.encryptedDataLength - buffer.length - 1);
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filled.fill(0xff, 0, filled.length - 1);
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filled[0] = 1;
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filled[filled.length - 1] = 0;
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return Buffer.concat([filled, buffer]);
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} else {
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/* random padding for public key encrypt */
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filled = Buffer.alloc(this.key.encryptedDataLength - buffer.length);
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filled[0] = 0;
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filled[1] = 2;
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var rand = crypt.randomBytes(filled.length - 3);
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for (var i = 0; i < rand.length; i++) {
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var r = rand[i];
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while (r === 0) { // non-zero only
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r = crypt.randomBytes(1)[0];
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}
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filled[i + 2] = r;
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}
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filled[filled.length - 1] = 0;
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return Buffer.concat([filled, buffer]);
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}
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};
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/**
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* Unpad input Buffer and, if valid, return the Buffer object
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* alg: PKCS#1 (type 2, random)
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* @param buffer
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* @returns {Buffer}
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*/
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Scheme.prototype.encUnPad = function (buffer, options) {
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return buffer;
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};
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Scheme.prototype.sign = function (buffer) {
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var hashAlgorithm = this.options.signingSchemeOptions.hash || DEFAULT_HASH_FUNCTION;
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hashAlgorithm = SIGN_ALG_TO_HASH_ALIASES[hashAlgorithm] || hashAlgorithm;
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var hasher = crypt.createHash(hashAlgorithm);
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hasher.update(buffer);
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var hash = this.pkcs1pad(hasher.digest(), hashAlgorithm);
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var res = this.key.$doPrivate(new BigInteger(hash)).toBuffer(this.key.encryptedDataLength);
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return res;
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};
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Scheme.prototype.verify = function (buffer, signature, signature_encoding) {
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if (this.options.encryptionSchemeOptions && this.options.encryptionSchemeOptions.padding == 3) {
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//RSA_NO_PADDING has no verify data
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return false;
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}
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var hashAlgorithm = this.options.signingSchemeOptions.hash || DEFAULT_HASH_FUNCTION;
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hashAlgorithm = SIGN_ALG_TO_HASH_ALIASES[hashAlgorithm] || hashAlgorithm;
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if (signature_encoding) {
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signature = Buffer.from(signature, signature_encoding);
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}
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var hasher = crypt.createHash(hashAlgorithm);
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hasher.update(buffer);
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var hash = this.pkcs1pad(hasher.digest(), hashAlgorithm);
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var m = this.key.$doPublic(new BigInteger(signature));
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return m.toBuffer().toString('hex') == hash.toString('hex');
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};
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/**
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* PKCS#1 zero pad input buffer to max data length
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* @param hashBuf
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* @param hashAlgorithm
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* @returns {*}
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*/
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Scheme.prototype.pkcs0pad = function (buffer) {
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var filled = Buffer.alloc(this.key.maxMessageLength - buffer.length);
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filled.fill(0);
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return Buffer.concat([filled, buffer]);
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};
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Scheme.prototype.pkcs0unpad = function (buffer) {
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var unPad;
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if (typeof buffer.lastIndexOf == "function") { //patch for old node version
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unPad = buffer.slice(buffer.lastIndexOf('\0') + 1, buffer.length);
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} else {
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unPad = buffer.slice(String.prototype.lastIndexOf.call(buffer, '\0') + 1, buffer.length);
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}
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return unPad;
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};
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/**
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* PKCS#1 pad input buffer to max data length
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* @param hashBuf
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* @param hashAlgorithm
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* @returns {*}
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*/
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Scheme.prototype.pkcs1pad = function (hashBuf, hashAlgorithm) {
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var digest = SIGN_INFO_HEAD[hashAlgorithm];
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if (!digest) {
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throw Error('Unsupported hash algorithm');
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}
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var data = Buffer.concat([digest, hashBuf]);
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if (data.length + 10 > this.key.encryptedDataLength) {
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throw Error('Key is too short for signing algorithm (' + hashAlgorithm + ')');
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}
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var filled = Buffer.alloc(this.key.encryptedDataLength - data.length - 1);
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filled.fill(0xff, 0, filled.length - 1);
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filled[0] = 1;
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filled[filled.length - 1] = 0;
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var res = Buffer.concat([filled, data]);
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return res;
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};
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return new Scheme(key, options);
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};
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const PRIVATE_OPENING_BOUNDARY = '-----BEGIN RSA PRIVATE KEY-----';
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const PRIVATE_CLOSING_BOUNDARY = '-----END RSA PRIVATE KEY-----';
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const PUBLIC_OPENING_BOUNDARY = '-----BEGIN RSA PUBLIC KEY-----';
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const PUBLIC_CLOSING_BOUNDARY = '-----END RSA PUBLIC KEY-----';
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module.exports = {
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privateExport: function (key, options) {
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options = options || {};
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var n = key.n.toBuffer();
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var d = key.d.toBuffer();
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var p = key.p.toBuffer();
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var q = key.q.toBuffer();
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var dmp1 = key.dmp1.toBuffer();
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var dmq1 = key.dmq1.toBuffer();
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var coeff = key.coeff.toBuffer();
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var length = n.length + d.length + p.length + q.length + dmp1.length + dmq1.length + coeff.length + 512; // magic
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var writer = new ber.Writer({size: length});
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writer.startSequence();
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writer.writeInt(0);
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writer.writeBuffer(n, 2);
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writer.writeInt(key.e);
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writer.writeBuffer(d, 2);
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writer.writeBuffer(p, 2);
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writer.writeBuffer(q, 2);
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writer.writeBuffer(dmp1, 2);
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writer.writeBuffer(dmq1, 2);
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writer.writeBuffer(coeff, 2);
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writer.endSequence();
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if (options.type === 'der') {
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return writer.buffer;
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} else {
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return PRIVATE_OPENING_BOUNDARY + '\n' + utils.linebrk(writer.buffer.toString('base64'), 64) + '\n' + PRIVATE_CLOSING_BOUNDARY;
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}
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},
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privateImport: function (key, data, options) {
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options = options || {};
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var buffer;
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if (options.type !== 'der') {
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if (Buffer.isBuffer(data)) {
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data = data.toString('utf8');
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}
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if (_.isString(data)) {
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var pem = utils.trimSurroundingText(data, PRIVATE_OPENING_BOUNDARY, PRIVATE_CLOSING_BOUNDARY)
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.replace(/\s+|\n\r|\n|\r$/gm, '');
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buffer = Buffer.from(pem, 'base64');
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} else {
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throw Error('Unsupported key format');
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}
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} else if (Buffer.isBuffer(data)) {
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buffer = data;
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} else {
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throw Error('Unsupported key format');
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}
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var reader = new ber.Reader(buffer);
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reader.readSequence();
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reader.readString(2, true); // just zero
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key.setPrivate(
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reader.readString(2, true), // modulus
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reader.readString(2, true), // publicExponent
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reader.readString(2, true), // privateExponent
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reader.readString(2, true), // prime1
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reader.readString(2, true), // prime2
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reader.readString(2, true), // exponent1 -- d mod (p1)
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reader.readString(2, true), // exponent2 -- d mod (q-1)
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reader.readString(2, true) // coefficient -- (inverse of q) mod p
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);
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},
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publicExport: function (key, options) {
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options = options || {};
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var n = key.n.toBuffer();
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var length = n.length + 512; // magic
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var bodyWriter = new ber.Writer({size: length});
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bodyWriter.startSequence();
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bodyWriter.writeBuffer(n, 2);
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bodyWriter.writeInt(key.e);
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bodyWriter.endSequence();
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if (options.type === 'der') {
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return bodyWriter.buffer;
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} else {
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return PUBLIC_OPENING_BOUNDARY + '\n' + utils.linebrk(bodyWriter.buffer.toString('base64'), 64) + '\n' + PUBLIC_CLOSING_BOUNDARY;
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}
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},
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publicImport: function (key, data, options) {
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options = options || {};
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var buffer;
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if (options.type !== 'der') {
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if (Buffer.isBuffer(data)) {
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data = data.toString('utf8');
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}
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if (_.isString(data)) {
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var pem = utils.trimSurroundingText(data, PUBLIC_OPENING_BOUNDARY, PUBLIC_CLOSING_BOUNDARY)
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.replace(/\s+|\n\r|\n|\r$/gm, '');
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buffer = Buffer.from(pem, 'base64');
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}
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} else if (Buffer.isBuffer(data)) {
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buffer = data;
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} else {
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throw Error('Unsupported key format');
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}
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var body = new ber.Reader(buffer);
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body.readSequence();
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key.setPublic(
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body.readString(0x02, true), // modulus
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body.readString(0x02, true) // publicExponent
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);
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},
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/**
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* Trying autodetect and import key
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* @param key
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* @param data
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*/
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autoImport: function (key, data) {
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// [\S\s]* matches zero or more of any character
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if (/^[\S\s]*-----BEGIN RSA PRIVATE KEY-----\s*(?=(([A-Za-z0-9+/=]+\s*)+))\1-----END RSA PRIVATE KEY-----[\S\s]*$/g.test(data)) {
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module.exports.privateImport(key, data);
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return true;
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}
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if (/^[\S\s]*-----BEGIN RSA PUBLIC KEY-----\s*(?=(([A-Za-z0-9+/=]+\s*)+))\1-----END RSA PUBLIC KEY-----[\S\s]*$/g.test(data)) {
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module.exports.publicImport(key, data);
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return true;
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}
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return false;
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}
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};
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