feat(jellyfish-crypto): add fromAddress to convert eth address into s…

…cript

packages/jellyfish-crypto/__tests__/eth.test.ts

@@ -1,3 +1,4 @@
+import { OP_CODES } from '@defichain/jellyfish-transaction'
 import { Eth } from '../src'
 
 const keypair = {
@@ -18,3 +19,13 @@ it('should convert evm address to checksum address', () => {
   const checksumEvmAddr = Eth.fromPubKeyUncompressed(pubKeyUncompressed)
   expect(checksumEvmAddr).toStrictEqual(keypair.checksumEvmAddr)
 })
+
+it('should convert evm address to script', () => {
+  const evmScript = Eth.fromAddress(keypair.evmAddr)
+  expect(evmScript).toStrictEqual({
+    stack: [
+      OP_CODES.OP_16,
+      OP_CODES.OP_PUSHDATA_HEX_LE(keypair.evmAddr.substring(2))
+    ]
+  })
+})

packages/jellyfish-crypto/src/eth.ts

@@ -1,5 +1,6 @@
 import createKeccakHash from 'keccak'
 import { KECCAK256 } from './hash'
+import { OP_CODES, Script } from '@defichain/jellyfish-transaction'
 
 // https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md
 function toChecksumAddress (address: string): string {
@@ -23,6 +24,12 @@ function toAddress (hash: Buffer): string {
   return `0x${sliced}`
 }
 
+function validateAddress (address: string): boolean {
+  // https://github.com/ethers-io/ethers.js/blob/5210b68a7837654c6b84207a45e1e573d9472d1a/src.ts/address/address.ts#L123
+  const regex: RegExp = /^0x[a-fA-F0-9]{40}$/gm
+  return regex.test(address)
+}
+
 export const Eth = {
   /**
    * @param {Buffer} uncompressed pubKey to format into Eth
@@ -35,5 +42,20 @@ export const Eth = {
     const sub = pubKeyUncompressed.subarray(1, 65)
     const hash = KECCAK256(sub)
     return toChecksumAddress(toAddress(hash))
+  },
+  /**
+   * @param {string} address to convert into Script
+   * @return {Script} Script parsed from address
+   */
+  fromAddress (address: string): Script | undefined {
+    if (!validateAddress(address)) {
+      return undefined
+    }
+    return {
+      stack: [
+        OP_CODES.OP_16,
+        OP_CODES.OP_PUSHDATA_HEX_LE(address.substring(2))
+      ]
+    }
   }
 }