From 1d90668845f229948ab27a863cc3f5acd55b1bca Mon Sep 17 00:00:00 2001
From: acolytec3 <17355484+acolytec3@users.noreply.github.com>
Date: Wed, 17 Jan 2024 21:48:04 -0500
Subject: [PATCH] Add ecrecover function

---
 packages/evm/test/customCrypto.spec.ts | 35 ++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/packages/evm/test/customCrypto.spec.ts b/packages/evm/test/customCrypto.spec.ts
index b1c2632272..815331039f 100644
--- a/packages/evm/test/customCrypto.spec.ts
+++ b/packages/evm/test/customCrypto.spec.ts
@@ -1,4 +1,12 @@
 import { Chain, Common } from '@ethereumjs/common'
+import {
+  bytesToHex,
+  concatBytes,
+  hexToBytes,
+  intToBytes,
+  randomBytes,
+  setLengthLeft,
+} from '@ethereumjs/util'
 import { assert, describe, it } from 'vitest'
 
 import { EVM } from '../src/evm.js'
@@ -26,4 +34,31 @@ describe('custom crypto', () => {
     })
     assert.equal(result.returnValue[0], 0xff, 'used custom sha256 hashing function')
   })
+
+  it('should use custom ecrecover function', async () => {
+    const customEcrecover = (_msg: Uint8Array) => {
+      return hexToBytes(
+        '0x84b2586da9b582d3cb260e8fd136129c734f3c80453f48a68e8217ea0b81e08342520f318d202f27a548ad8d3f814ca76d0ee621de2cc510c29e2db4d4f39418'
+      )
+    }
+    const customCrypto = {
+      ecrecover: customEcrecover,
+    }
+    const msg = concatBytes(randomBytes(32), setLengthLeft(intToBytes(27), 32), randomBytes(32))
+    const common = new Common({ chain: Chain.Mainnet, customCrypto })
+    const evm = new EVM({ common })
+    const addressStr = '0000000000000000000000000000000000000001'
+    const ECRECOVER = getActivePrecompiles(common).get(addressStr)!
+    const result = await ECRECOVER({
+      data: msg,
+      gasLimit: 0xfffffn,
+      common,
+      _EVM: evm,
+    })
+    assert.equal(
+      bytesToHex(result.returnValue),
+      '0x00000000000000000000000063304c5c6884567b84b18f5bc5774d829a32d25d',
+      'used custom ecrecover hashing function'
+    )
+  })
 })