229 lines
8.5 KiB
HTML
229 lines
8.5 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<meta charset="utf-8">
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<title>JSDoc: Source: crypto.js</title>
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<h1 class="page-title">Source: crypto.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>/**
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* Isomorphic Bitmessage crypto module. Reexports platform-dependent
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* implementations and also some common routines.
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* @module bitmessage/crypto
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*/
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"use strict";
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var eccrypto = require("eccrypto");
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var assert = require("./_util").assert;
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var platform = require("./platform");
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var promise = platform.promise;
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/**
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* Calculate SHA-1 hash.
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* @param {Buffer} buf - Input data
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* @return {Buffer} Resulting hash.
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* @function
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* @static
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*/
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var sha1 = exports.sha1 = platform.sha1;
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/**
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* Calculate SHA-256 hash.
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* @param {Buffer} buf - Input data
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* @return {Buffer} Resulting hash.
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* @function
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*/
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exports.sha256 = platform.sha256;
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/**
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* Calculate SHA-512 hash.
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* @param {Buffer} buf - Input data
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* @return {Buffer} Resulting hash.
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* @function
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*/
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exports.sha512 = platform.sha512;
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/**
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* Calculate RIPEMD-160 hash.
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* @param {Buffer} buf - Input data
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* @return {Buffer} Resulting hash.
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* @function
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*/
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exports.ripemd160 = platform.ripemd160;
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/**
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* Generate cryptographically strong pseudo-random data.
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* @param {number} size - Number of bytes
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* @return {Buffer} Buffer with random data.
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* @function
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*/
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exports.randomBytes = platform.randomBytes;
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/**
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* Generate new random private key.
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* @return {Buffer} New private key.
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*/
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exports.getPrivate = function() {
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return platform.randomBytes(32);
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};
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/**
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* Generate public key for the given private key.
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* @param {Buffer} privateKey - A 32-byte private key
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* @return {Buffer} A 65-byte (uncompressed) public key.
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* @function
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*/
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exports.getPublic = eccrypto.getPublic;
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/**
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* Sign message using ecdsa-with-sha1 scheme.
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* @param {Buffer} privateKey - A 32-byte private key
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* @param {Buffer} msg - The message being signed
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* @return {Promise.<Buffer>} A promise that contains signature in DER
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* format when fulfilled.
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*/
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exports.sign = function(privateKey, msg) {
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var hash = sha1(msg);
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return eccrypto.sign(privateKey, hash);
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};
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/**
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* Verify signature using ecdsa-with-sha1 scheme.
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* @param {Buffer} publicKey - A 65-byte public key
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* @param {Buffer} msg - The message being verified
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* @param {Buffer} sig - The signature in DER format
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* @return {Promise.<undefined>} A promise that resolves on correct
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* signature and rejects on bad key or signature.
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*/
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exports.verify = function(publicKey, msg, sig) {
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var hash = sha1(msg);
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return eccrypto.verify(publicKey, hash, sig);
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};
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var SECP256K1_TYPE = 714;
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// We define this structure here to avoid circular imports. However we
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// rexport and document it in `structs` module for consistency.
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var encrypted = exports.encrypted = {
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decode: function(buf) {
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assert(buf.length >= 118, "Buffer is too small");
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assert(buf.readUInt16BE(16, true) === SECP256K1_TYPE, "Bad curve type");
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assert(buf.readUInt16BE(18, true) === 32, "Bad Rx length");
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assert(buf.readUInt16BE(52, true) === 32, "Bad Ry length");
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var iv = new Buffer(16);
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buf.copy(iv, 0, 0, 16);
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var ephemPublicKey = new Buffer(65);
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ephemPublicKey[0] = 0x04;
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buf.copy(ephemPublicKey, 1, 20, 52);
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buf.copy(ephemPublicKey, 33, 54, 86);
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// NOTE(Kagami): We do copy instead of slice to protect against
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// possible source buffer modification by user.
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var ciphertext = new Buffer(buf.length - 118);
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buf.copy(ciphertext, 0, 86, buf.length - 32);
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var mac = new Buffer(32);
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buf.copy(mac, 0, buf.length - 32);
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return {
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iv: iv,
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ephemPublicKey: ephemPublicKey,
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ciphertext: ciphertext,
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mac: mac,
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};
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},
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encode: function(opts) {
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assert(opts.iv.length === 16, "Bad IV");
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assert(opts.ephemPublicKey.length === 65, "Bad public key");
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assert(opts.mac.length === 32, "Bad MAC");
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// 16 + 2 + 2 + 32 + 2 + 32 + ? + 32
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var buf = new Buffer(118 + opts.ciphertext.length);
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opts.iv.copy(buf);
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buf.writeUInt16BE(SECP256K1_TYPE, 16, true); // Curve type
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buf.writeUInt16BE(32, 18, true); // Rx length
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opts.ephemPublicKey.copy(buf, 20, 1, 33); // Rx
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buf.writeUInt16BE(32, 52, true); // Ry length
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opts.ephemPublicKey.copy(buf, 54, 33); // Ry
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opts.ciphertext.copy(buf, 86);
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opts.mac.copy(buf, 86 + opts.ciphertext.length);
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return buf;
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},
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};
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/**
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* Encrypt message for given recepient's public key.
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* @param {Buffer} publicKeyTo - Recipient's public key (65 bytes)
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* @param {Buffer} msg - The message being encrypted
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* @param {?{?iv: Buffer, ?ephemPrivateKey: Buffer}} opts - You may also
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* specify initialization vector (16 bytes) and ephemeral private key
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* (32 bytes) to get deterministic results.
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* @return {Promise.<Buffer>} - A promise that resolves with the buffer
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* in `encrypted` format successful encryption and rejects on failure.
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*/
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// TODO(Kagami): Properly document `opts`. Documenting multiple
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// function arguments with options object at the end for now gives
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// strange results (probably a bug in jsdoc).
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exports.encrypt = function(publicKeyTo, msg, opts) {
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return eccrypto.encrypt(publicKeyTo, msg, opts).then(function(encObj) {
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return encrypted.encode(encObj);
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});
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};
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/**
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* Decrypt message using given private key.
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* @param {Buffer} privateKey - A 32-byte private key of recepient of
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* the mesage
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* @param {Buffer} buf - Encrypted data
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* @return {Promise.<Buffer>} - A promise that resolves with the
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* plaintext on successful decryption and rejects on failure.
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*/
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exports.decrypt = function(privateKey, buf) {
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return new promise(function(resolve) {
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var encObj = encrypted.decode(buf);
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resolve(eccrypto.decrypt(privateKey, encObj));
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});
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};
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</code></pre>
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</article>
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</section>
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</div>
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<nav>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-bitmessage.html">bitmessage</a></li><li><a href="module-bitmessage_address.html">bitmessage/address</a></li><li><a href="module-bitmessage_crypto.html">bitmessage/crypto</a></li><li><a href="module-bitmessage_messages.html">bitmessage/messages</a></li><li><a href="module-bitmessage_objects.html">bitmessage/objects</a></li><li><a href="module-bitmessage_pow.html">bitmessage/pow</a></li><li><a href="module-bitmessage_structs.html">bitmessage/structs</a></li><li><a href="module-bitmessage_user-agent.html">bitmessage/user-agent</a></li><li><a href="module-bitmessage_wif.html">bitmessage/wif</a></li></ul><h3>Classes</h3><ul><li><a href="module-bitmessage_address.Address.html">Address</a></li></ul><h3>Namespaces</h3><ul><li><a href="module-bitmessage_messages.addr.html">addr</a></li><li><a href="module-bitmessage_messages.error.html">error</a></li><li><a href="module-bitmessage_messages.getdata.html">getdata</a></li><li><a href="module-bitmessage_messages.inv.html">inv</a></li><li><a href="module-bitmessage_messages.version.html">version</a></li><li><a href="module-bitmessage_objects.broadcast.html">broadcast</a></li><li><a href="module-bitmessage_objects.getpubkey.html">getpubkey</a></li><li><a href="module-bitmessage_objects.msg.html">msg</a></li><li><a href="module-bitmessage_objects.pubkey.html">pubkey</a></li><li><a href="module-bitmessage_structs.encrypted.html">encrypted</a></li><li><a href="module-bitmessage_structs.inv_vect.html">inv_vect</a></li><li><a href="module-bitmessage_structs.message.html">message</a></li><li><a href="module-bitmessage_structs.net_addr.html">net_addr</a></li><li><a href="module-bitmessage_structs.object.html">object</a></li><li><a href="module-bitmessage_structs.PubkeyBitfield.html">PubkeyBitfield</a></li><li><a href="module-bitmessage_structs.ServicesBitfield.html">ServicesBitfield</a></li><li><a href="module-bitmessage_structs.var_int.html">var_int</a></li><li><a href="module-bitmessage_structs.var_int_list.html">var_int_list</a></li><li><a href="module-bitmessage_structs.var_str.html">var_str</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.0-beta1</a> on Sat Jan 31 2015 14:53:21 GMT+0300 (MSK)
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