src/native: expose native schnorr backend from libtorsion.

README.md

@@ -60,6 +60,7 @@ TODO
 | rsa                          | c (libtorsion²)   | c (libtorsion²)   | c (libtorsion)    | js      |
 | rsaies                       | c (libtorsion¹)   | c (libtorsion¹)   | c (libtorsion¹)   | js      |
 | salsa20                      | c (libtorsion¹)   | c (libtorsion¹)   | c (libtorsion¹)   | js      |
+| schnorr                      | c (libtorsion)    | c (libtorsion)    | c (libtorsion)    | js      |
 | scrypt                       | c (libtorsion)    | c (libtorsion)    | c (libtorsion)    | js      |
 | secp256k1                    | c (libsecp256k1⁴) | c (libsecp256k1⁴) | c (libsecp256k1⁴) | js      |
 | sha1                         | c (libtorsion)    | c (libtorsion)    | c (libtorsion)    | js      |

binding.gyp

@@ -41,6 +41,7 @@
       "./src/rsa.cc",
       "./src/rsa_async.cc",
       "./src/salsa20.cc",
+      "./src/schnorr.cc",
       "./src/scrypt.cc",
       "./src/scrypt_async.cc",
       "./src/siphash.cc",

lib/bcrypto.js

@@ -71,6 +71,7 @@ exports.rsa = require('./rsa');
 exports.rsaies = require('./rsaies');
 exports.safe = require('./safe');
 exports.Salsa20 = require('./salsa20');
+exports.schnorr = require('./schnorr');
 exports.scrypt = require('./scrypt');
 exports.secp256k1 = require('./secp256k1');
 exports.secretbox = require('./secretbox');

lib/native/schnorr.js

@@ -0,0 +1,69 @@
+/*!
+ * schnorr.js - schnorr wrapper for libtorsion
+ * Copyright (c) 2018-2019, Christopher Jeffrey (MIT License).
+ * https://github.com/bcoin-org/bcrypto
+ */
+
+'use strict';
+
+const assert = require('../internal/assert');
+const binding = require('./binding');
+
+/**
+ * Schnorr
+ */
+
+class Schnorr extends binding.Schnorr {
+  constructor(name) {
+    super(binding.curves[name]);
+
+    this.id = name;
+    this.type = 'schnorr';
+    this.size = this._size();
+    this.bits = this._bits();
+    this.native = 2;
+
+    this._randomize(binding.entropy());
+  }
+
+  privateKeyGenerate() {
+    return super.privateKeyGenerate(binding.entropy());
+  }
+
+  privateKeyExport(key) {
+    const pub = this.publicKeyCreate(key);
+    const [x, y] = super.publicKeyExport(pub);
+    const d = super.privateKeyExport(key);
+
+    return { d, x, y };
+  }
+
+  privateKeyImport(json) {
+    assert(json && typeof json === 'object');
+    return super.privateKeyImport(json.d);
+  }
+
+  publicKeyExport(key) {
+    const [x, y] = super.publicKeyExport(key);
+    return { x, y };
+  }
+
+  publicKeyImport(json) {
+    assert(json && typeof json === 'object');
+    return super.publicKeyImport(json.x);
+  }
+
+  publicKeyToUniform(key, hint = binding.hint()) {
+    return super.publicKeyToUniform(key, hint);
+  }
+
+  publicKeyToHash(key) {
+    return super.publicKeyToHash(key, binding.entropy());
+  }
+}
+
+/*
+ * Expose
+ */
+
+module.exports = new Schnorr('SECP256K1');

lib/schnorr-browser.js

@@ -0,0 +1,9 @@
+/*!
+ * schnorr.js - schnorr for bcrypto
+ * Copyright (c) 2020, Christopher Jeffrey (MIT License).
+ * https://github.com/bcoin-org/bcrypto
+ */
+
+'use strict';
+
+module.exports = require('./js/schnorr');

lib/schnorr.js

@@ -0,0 +1,12 @@
+/*!
+ * schnorr.js - schnorr for bcrypto
+ * Copyright (c) 2020, Christopher Jeffrey (MIT License).
+ * https://github.com/bcoin-org/bcrypto
+ */
+
+'use strict';
+
+if (process.env.NODE_BACKEND === 'js')
+  module.exports = require('./js/schnorr');
+else
+  module.exports = require('./native/schnorr');

package.json

@@ -82,6 +82,7 @@
     "./lib/ripemd160": "./lib/ripemd160-browser.js",
     "./lib/rsa": "./lib/rsa-browser.js",
     "./lib/salsa20": "./lib/salsa20-browser.js",
+    "./lib/schnorr": "./lib/schnorr-browser.js",
     "./lib/scrypt": "./lib/scrypt-browser.js",
     "./lib/secp256k1": "./lib/secp256k1-browser.js",
     "./lib/sha1": "./lib/sha1-browser.js",

src/bcrypto.cc

@@ -26,6 +26,7 @@
 #include "pbkdf2.h"
 #include "rsa.h"
 #include "salsa20.h"
+#include "schnorr.h"
 #include "scrypt.h"
 #ifdef BCRYPTO_USE_SECP256K1
 #include "secp256k1.h"
@@ -53,6 +54,7 @@ NAN_MODULE_INIT(init) {
   BPBKDF2::Init(target);
   BRSA::Init(target);
   BSalsa20::Init(target);
+  BSchnorr::Init(target);
   BScrypt::Init(target);
 #ifdef BCRYPTO_USE_SECP256K1
   BSecp256k1::Init(target);