feat: Add DH and ECDH support

example/ios/QuickCryptoExample.xcodeproj/project.pbxproj

@@ -398,7 +398,7 @@
 					"-DFOLLY_HAVE_CLOCK_GETTIME=1",
 				);
 				OTHER_LDFLAGS = "$(inherited)";
-				REACT_NATIVE_PATH = "${PODS_ROOT}/../../../node_modules/react-native";
+				REACT_NATIVE_PATH = "${PODS_ROOT}/../../node_modules/react-native";
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited) DEBUG";
 				SWIFT_ENABLE_EXPLICIT_MODULES = NO;

example/src/benchmarks/dh/dh.ts

@@ -0,0 +1,59 @@
+import rnqc from 'react-native-quick-crypto';
+// @ts-expect-error crypto-browserify missing types
+import browserify from 'crypto-browserify';
+import type { BenchFn } from '../../types/benchmarks';
+import { Bench } from 'tinybench';
+
+const dh_modp14_genKeys: BenchFn = () => {
+  const bench = new Bench({
+    name: 'DH modp14 KeyGen',
+    time: 200,
+    iterations: 10, // Cap iterations for slow JS implementations
+  });
+
+  bench
+    .add('rnqc', () => {
+      const dh = rnqc.getDiffieHellman('modp14');
+      dh.generateKeys();
+    })
+    .add('browserify', () => {
+      const dh = browserify.getDiffieHellman('modp14');
+      dh.generateKeys();
+    });
+
+  bench.warmupTime = 100;
+  return bench;
+};
+
+const dh_modp14_computeSecret: BenchFn = () => {
+  const bench = new Bench({
+    name: 'DH modp14 Compute',
+    time: 200,
+    iterations: 10,
+  });
+
+  const alice = rnqc.getDiffieHellman('modp14');
+  alice.generateKeys();
+  const bob = rnqc.getDiffieHellman('modp14');
+  bob.generateKeys();
+  const bobPub = bob.getPublicKey();
+
+  const bAlice = browserify.getDiffieHellman('modp14');
+  bAlice.generateKeys();
+  const bBob = browserify.getDiffieHellman('modp14');
+  bBob.generateKeys();
+  const bBobPub = bBob.getPublicKey();
+
+  bench
+    .add('rnqc', () => {
+      alice.computeSecret(bobPub);
+    })
+    .add('browserify', () => {
+      bAlice.computeSecret(bBobPub);
+    });
+
+  bench.warmupTime = 100;
+  return bench;
+};
+
+export default [dh_modp14_genKeys, dh_modp14_computeSecret];

example/src/benchmarks/ecdh/ecdh.ts

@@ -0,0 +1,55 @@
+import rnqc from 'react-native-quick-crypto';
+import { p256 } from '@noble/curves/p256';
+import type { BenchFn } from '../../types/benchmarks';
+import { Bench } from 'tinybench';
+
+const TIME_MS = 1000;
+
+const ecdh_p256_genKeys: BenchFn = () => {
+  const bench = new Bench({
+    name: 'ECDH P-256 KeyGen',
+    time: TIME_MS,
+  });
+
+  bench
+    .add('rnqc', () => {
+      const ecdh = rnqc.createECDH('prime256v1');
+      ecdh.generateKeys();
+    })
+    .add('@noble/curves', () => {
+      p256.utils.randomPrivateKey();
+    });
+
+  bench.warmupTime = 100;
+  return bench;
+};
+
+const ecdh_p256_computeSecret: BenchFn = () => {
+  const bench = new Bench({
+    name: 'ECDH P-256 Compute',
+    time: TIME_MS,
+  });
+
+  const alice = rnqc.createECDH('prime256v1');
+  alice.generateKeys();
+  const bob = rnqc.createECDH('prime256v1');
+  bob.generateKeys();
+  const bobPub = bob.getPublicKey();
+
+  const nobleAlicePriv = p256.utils.randomPrivateKey();
+  const nobleBobPriv = p256.utils.randomPrivateKey();
+  const nobleBobPub = p256.getPublicKey(nobleBobPriv);
+
+  bench
+    .add('rnqc', () => {
+      alice.computeSecret(bobPub);
+    })
+    .add('@noble/curves', () => {
+      p256.getSharedSecret(nobleAlicePriv, nobleBobPub);
+    });
+
+  bench.warmupTime = 100;
+  return bench;
+};
+
+export default [ecdh_p256_genKeys, ecdh_p256_computeSecret];

example/src/hooks/useBenchmarks.ts

@@ -7,6 +7,8 @@ import hkdf from '../benchmarks/hkdf/hkdf';
 import hash from '../benchmarks/hash/hash';
 import hmac from '../benchmarks/hmac/hmac';
 import pbkdf2 from '../benchmarks/pbkdf2/pbkdf2';
+import ecdh from '../benchmarks/ecdh/ecdh';
+import dh from '../benchmarks/dh/dh';
 import random from '../benchmarks/random/randomBytes';
 import scrypt from '../benchmarks/scrypt/scrypt';
 import xsalsa20 from '../benchmarks/cipher/xsalsa20';
@@ -32,6 +34,8 @@ export const useBenchmarks = (): [
     newSuites.push(new BenchmarkSuite('hash', hash));
     newSuites.push(new BenchmarkSuite('hmac', hmac));
     newSuites.push(new BenchmarkSuite('hkdf', hkdf));
+    newSuites.push(new BenchmarkSuite('ecdh', ecdh));
+    newSuites.push(new BenchmarkSuite('dh', dh));
     newSuites.push(
       new BenchmarkSuite('random', random, {
         'browserify/randombytes':

example/src/hooks/useTestsList.ts

@@ -16,6 +16,8 @@ import '../tests/keys/generate_keypair';
 import '../tests/keys/public_cipher';
 import '../tests/keys/sign_verify_streaming';
 import '../tests/pbkdf2/pbkdf2_tests';
+import '../tests/ecdh/ecdh_tests';
+import '../tests/dh/dh_tests';
 import '../tests/random/random_tests';
 import '../tests/scrypt/scrypt_tests';
 import '../tests/subtle/deriveBits';

example/src/tests/dh/dh_tests.ts

@@ -0,0 +1,76 @@
+import { test } from '../util';
+import { Buffer } from '@craftzdog/react-native-buffer';
+import crypto from 'react-native-quick-crypto';
+import { assert } from 'chai';
+
+const SUITE = 'dh';
+
+test(SUITE, 'should create DiffieHellman with size', () => {
+  const dh = crypto.createDiffieHellman(512);
+  const prime = dh.getPrime();
+  assert.isOk(prime);
+  // Size check approx
+  assert.isAtLeast(prime.length, 64);
+});
+
+test(SUITE, 'should create DiffieHellman with prime', () => {
+  // 512-bit prime (Group 1 from RFC 2409)
+  const prime = Buffer.from(
+    'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1' +
+      '29024E088A67CC74020BBEA63B139B22514A08798E3404DD' +
+      'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245' +
+      'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' +
+      'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381' +
+      'FFFFFFFFFFFFFFFF',
+    'hex',
+  );
+  const generator = Buffer.from([2]);
+  const dh = crypto.createDiffieHellman(prime, generator);
+
+  assert.strictEqual(dh.getPrime('hex'), prime.toString('hex').toLowerCase());
+  assert.strictEqual(
+    dh.getGenerator('hex'),
+    generator.toString('hex').toLowerCase(),
+  );
+});
+
+test(SUITE, 'should compute shared secret', () => {
+  const alice = crypto.createDiffieHellman(512);
+  const aliceKeys = alice.generateKeys();
+
+  const bob = crypto.createDiffieHellman(
+    alice.getPrime(),
+    alice.getGenerator(),
+  );
+  const bobKeys = bob.generateKeys();
+
+  const aliceSecret = alice.computeSecret(bobKeys);
+  const bobSecret = bob.computeSecret(aliceKeys);
+
+  assert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex'));
+});
+
+test(SUITE, 'should set keys', () => {
+  const alice = crypto.createDiffieHellman(512);
+  alice.generateKeys();
+
+  const dh2 = crypto.createDiffieHellman(
+    alice.getPrime(),
+    alice.getGenerator(),
+  );
+  dh2.setPublicKey(alice.getPublicKey());
+  dh2.setPrivateKey(alice.getPrivateKey());
+
+  assert.strictEqual(dh2.getPublicKey('hex'), alice.getPublicKey('hex'));
+  assert.strictEqual(dh2.getPrivateKey('hex'), alice.getPrivateKey('hex'));
+});
+
+test(SUITE, 'should create DiffieHellman from standard group', () => {
+  const dh = crypto.getDiffieHellman('modp14');
+  assert.isOk(dh);
+  const prime = dh.getPrime();
+  assert.isTrue(Buffer.isBuffer(prime));
+  // modp14 is 2048-bit group
+  assert.strictEqual(prime.length, 256);
+  assert.strictEqual(dh.getGenerator('hex'), '02');
+});

example/src/tests/ecdh/ecdh_tests.ts

@@ -0,0 +1,75 @@
+import { test } from '../util';
+import { Buffer } from '@craftzdog/react-native-buffer';
+import crypto from 'react-native-quick-crypto';
+import { assert } from 'chai';
+
+const SUITE = 'ecdh';
+
+test(SUITE, 'should create ECDH instance with P-256', () => {
+  const ecdh = crypto.createECDH('prime256v1');
+  assert.isOk(ecdh);
+});
+
+test(SUITE, 'should generate keys for P-256', () => {
+  const ecdh = crypto.createECDH('prime256v1');
+  const keys = ecdh.generateKeys();
+  assert.isOk(keys);
+  assert.isTrue(Buffer.isBuffer(keys), 'keys should be a Buffer');
+  assert.isOk(ecdh.getPublicKey());
+  assert.isOk(ecdh.getPrivateKey());
+});
+
+test(SUITE, 'should switch between curves', () => {
+  const ecdh1 = crypto.createECDH('prime256v1');
+  ecdh1.generateKeys();
+
+  const ecdh2 = crypto.createECDH('secp384r1');
+  ecdh2.generateKeys();
+
+  assert.notEqual(
+    ecdh1.getPrivateKey().toString('hex'),
+    ecdh2.getPrivateKey().toString('hex'),
+  );
+});
+
+test(SUITE, 'should compute shared secret', () => {
+  const alice = crypto.createECDH('prime256v1');
+  alice.generateKeys();
+
+  const bob = crypto.createECDH('prime256v1');
+  bob.generateKeys();
+
+  const aliceSecret = alice.computeSecret(bob.getPublicKey());
+  const bobSecret = bob.computeSecret(alice.getPublicKey());
+
+  assert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex'));
+});
+
+test(SUITE, 'should set private key', () => {
+  const alice = crypto.createECDH('prime256v1');
+  alice.generateKeys();
+  const priv = alice.getPrivateKey();
+
+  const alice2 = crypto.createECDH('prime256v1');
+  alice2.setPrivateKey(priv);
+
+  // Public key should be derived/set (depending on impl, but usually settable)
+  // In our implementation setPrivateKey derives public key?
+  // Let's check consistency.
+  // If setPrivateKey derives public key, we can check it matches
+  const pub1 = alice.getPublicKey();
+  const pub2 = alice2.getPublicKey();
+
+  assert.strictEqual(pub1.toString('hex'), pub2.toString('hex'));
+});
+
+test(SUITE, 'should work with string input', () => {
+  const alice = crypto.createECDH('prime256v1');
+  alice.generateKeys();
+  const bob = crypto.createECDH('prime256v1');
+  bob.generateKeys();
+
+  const bobPubHex = bob.getPublicKey().toString('hex');
+  const secret = alice.computeSecret(bobPubHex, 'hex');
+  assert.isOk(secret);
+});

packages/react-native-quick-crypto/QuickCrypto.podspec

@@ -130,6 +130,9 @@ Pod::Spec.new do |s|
   cpp_headers = [
     "\"$(PODS_TARGET_SRCROOT)/cpp/utils\"",
     "\"$(PODS_TARGET_SRCROOT)/cpp/hkdf\"",
+    "\"$(PODS_TARGET_SRCROOT)/cpp/dh\"",
+    "\"$(PODS_TARGET_SRCROOT)/cpp/ecdh\"",
+    "\"$(PODS_TARGET_SRCROOT)/nitrogen/generated/shared/c++\"",
     "\"$(PODS_TARGET_SRCROOT)/deps/ncrypto/include\"",
     "\"$(PODS_TARGET_SRCROOT)/deps/blake3/c\"",
     "\"$(PODS_TARGET_SRCROOT)/deps/fastpbkdf2\""

packages/react-native-quick-crypto/android/CMakeLists.txt

@@ -34,7 +34,9 @@ add_library(
   ../cpp/cipher/XSalsa20Cipher.cpp
   ../cpp/cipher/ChaCha20Cipher.cpp
   ../cpp/cipher/ChaCha20Poly1305Cipher.cpp
+  ../cpp/dh/HybridDiffieHellman.cpp
   ../cpp/ec/HybridEcKeyPair.cpp
+  ../cpp/ecdh/HybridECDH.cpp
   ../cpp/ed25519/HybridEdKeyPair.cpp
   ../cpp/hash/HybridHash.cpp
   ../cpp/hmac/HybridHmac.cpp
@@ -62,7 +64,9 @@ include_directories(
   "src/main/cpp"
   "../cpp/blake3"
   "../cpp/cipher"
+  "../cpp/dh"
   "../cpp/ec"
+  "../cpp/ecdh"
   "../cpp/ed25519"
   "../cpp/hash"
   "../cpp/hkdf"