fix: use native crypto if available

Adds the lodestar [crypto
implementation](https://github.com/ChainSafe/lodestar/blob/6f27ac6e5f439577906cbfe5f9e01c59586c2af3/packages/beacon-node/src/network/libp2p/noise.ts#L3) to this module
for use in node.

I'm trying to get js-libp2p back onto the [libp2p performance dashboard](https://observablehq.com/@libp2p-workspace/performance-dashboard) and in testing this change
increases streaming throughput from around 60 MB/s to almost 300 MB/s.

package.json

@@ -68,13 +68,15 @@
     "prepublish": "npm run build"
   },
   "dependencies": {
+    "@chainsafe/as-chacha20poly1305": "^0.1.0",
+    "@chainsafe/as-sha256": "^0.4.1",
     "@libp2p/crypto": "^2.0.0",
     "@libp2p/interface": "^0.1.0",
     "@libp2p/logger": "^3.0.0",
     "@libp2p/peer-id": "^3.0.0",
+    "@noble/ciphers": "^0.4.0",
     "@noble/curves": "^1.1.0",
     "@noble/hashes": "^1.3.1",
-    "@noble/ciphers": "^0.4.0",
     "it-byte-stream": "^1.0.0",
     "it-length-prefixed": "^9.0.1",
     "it-length-prefixed-stream": "^1.0.0",
@@ -108,7 +110,7 @@
     "sinon": "^16.1.3"
   },
   "browser": {
-    "./dist/src/alloc-unsafe.js": "./dist/src/alloc-unsafe-browser.js",
+    "./dist/src/crypto/index.js": "./dist/src/crypto/index.browser.js",
     "util": false
   }
 }

src/crypto/index.browser.ts

@@ -0,0 +1,3 @@
+import { pureJsCrypto } from './js'
+
+export const defaultCrypto = pureJsCrypto

src/crypto/index.ts

@@ -0,0 +1,79 @@
+import crypto from 'node:crypto'
+import { newInstance, ChaCha20Poly1305 } from '@chainsafe/as-chacha20poly1305'
+import { digest } from '@chainsafe/as-sha256'
+import { pureJsCrypto } from './js.js'
+import type { ICryptoInterface } from '../crypto.js'
+
+const ctx = newInstance()
+const asImpl = new ChaCha20Poly1305(ctx)
+const CHACHA_POLY1305 = 'chacha20-poly1305'
+const nodeCrypto: Pick<ICryptoInterface, 'hashSHA256' | 'chaCha20Poly1305Encrypt' | 'chaCha20Poly1305Decrypt'> = {
+  hashSHA256 (data) {
+    return crypto.createHash('sha256').update(data).digest()
+  },
+
+  chaCha20Poly1305Encrypt (plaintext, nonce, ad, k) {
+    const cipher = crypto.createCipheriv(CHACHA_POLY1305, k, nonce, {
+      authTagLength: 16
+    })
+    cipher.setAAD(ad, { plaintextLength: plaintext.byteLength })
+    const updated = cipher.update(plaintext)
+    const final = cipher.final()
+    const tag = cipher.getAuthTag()
+
+    const encrypted = Buffer.concat([updated, tag, final])
+    return encrypted
+  },
+
+  chaCha20Poly1305Decrypt (ciphertext, nonce, ad, k, _dst) {
+    const authTag = ciphertext.slice(ciphertext.length - 16)
+    const text = ciphertext.slice(0, ciphertext.length - 16)
+    const decipher = crypto.createDecipheriv(CHACHA_POLY1305, k, nonce, {
+      authTagLength: 16
+    })
+    decipher.setAAD(ad, {
+      plaintextLength: text.byteLength
+    })
+    decipher.setAuthTag(authTag)
+    const updated = decipher.update(text)
+    const final = decipher.final()
+    if (final.byteLength > 0) {
+      return Buffer.concat([updated, final])
+    }
+    return updated
+  }
+}
+
+const asCrypto: Pick<ICryptoInterface, 'hashSHA256' | 'chaCha20Poly1305Encrypt' | 'chaCha20Poly1305Decrypt'> = {
+  hashSHA256 (data) {
+    return digest(data)
+  },
+  chaCha20Poly1305Encrypt (plaintext, nonce, ad, k) {
+    return asImpl.seal(k, nonce, plaintext, ad)
+  },
+  chaCha20Poly1305Decrypt (ciphertext, nonce, ad, k, dst) {
+    return asImpl.open(k, nonce, ciphertext, ad, dst)
+  }
+}
+
+// benchmarks show that for chacha20poly1305
+// the as implementation is faster for smaller payloads(<1200)
+// and the node implementation is faster for larger payloads
+export const defaultCrypto: ICryptoInterface = {
+  ...pureJsCrypto,
+  hashSHA256 (data) {
+    return nodeCrypto.hashSHA256(data)
+  },
+  chaCha20Poly1305Encrypt (plaintext, nonce, ad, k) {
+    if (plaintext.length < 1200) {
+      return asCrypto.chaCha20Poly1305Encrypt(plaintext, nonce, ad, k)
+    }
+    return nodeCrypto.chaCha20Poly1305Encrypt(plaintext, nonce, ad, k)
+  },
+  chaCha20Poly1305Decrypt (ciphertext, nonce, ad, k, dst) {
+    if (ciphertext.length < 1200) {
+      return asCrypto.chaCha20Poly1305Decrypt(ciphertext, nonce, ad, k, dst)
+    }
+    return nodeCrypto.chaCha20Poly1305Decrypt(ciphertext, nonce, ad, k, dst)
+  }
+}

src/noise.ts

@@ -3,7 +3,7 @@ import { lpStream, type LengthPrefixedStream } from 'it-length-prefixed-stream'
 import { duplexPair } from 'it-pair/duplex'
 import { pipe } from 'it-pipe'
 import { NOISE_MSG_MAX_LENGTH_BYTES } from './constants.js'
-import { pureJsCrypto } from './crypto/js.js'
+import { defaultCrypto } from './crypto/index.js'
 import { decryptStream, encryptStream } from './crypto/streaming.js'
 import { uint16BEDecode, uint16BEEncode } from './encoder.js'
 import { XXHandshake } from './handshake-xx.js'
@@ -49,7 +49,7 @@ export class Noise implements INoiseConnection {
   constructor (init: NoiseInit = {}) {
     const { staticNoiseKey, extensions, crypto, prologueBytes, metrics } = init
 
-    this.crypto = crypto ?? pureJsCrypto
+    this.crypto = crypto ?? defaultCrypto
     this.extensions = extensions
     this.metrics = metrics ? registerMetrics(metrics) : undefined