refactor(experimental): implement createBase58AddressWithSeed

Author: 2501babe

packages/addresses/src/__tests__/base58-test.ts

@@ -3,6 +3,7 @@ import { base58 } from '@metaplex-foundation/umi-serializers';
 import {
     assertIsBase58EncodedAddress,
     Base58EncodedAddress,
+    createBase58AddressWithSeed,
     getBase58EncodedAddressCodec,
     getBase58EncodedAddressComparator,
 } from '../base58';
@@ -132,4 +133,16 @@ describe('base58', () => {
             ]);
         });
     });
+    describe('createBase58AddressWithSeed', () => {
+        it('works', async () => {
+            expect.assertions(1);
+            const baseAddress = 'Bh1uUDP3ApWLeccVNHwyQKpnfGQbuE2UECbGA6M4jiZJ' as Base58EncodedAddress;
+            const programAddress = 'FGrddpvjBUAG6VdV4fR8Q2hEZTHS6w4SEveVBgfwbfdm' as Base58EncodedAddress;
+            const expectedAddress = 'HUKxCeXY6gZohFJFARbLE6L6C9wDEHz1SfK8ENM7QY7z' as Base58EncodedAddress;
+
+            const actualAddress = await createBase58AddressWithSeed(baseAddress, 'seed', programAddress);
+
+            expect(actualAddress).toEqual(expectedAddress);
+        });
+    });
 });

packages/addresses/src/base58.ts

@@ -52,3 +52,18 @@ export function getBase58EncodedAddressComparator(): (x: string, y: string) => n
         usage: 'sort',
     }).compare;
 }
+
+export async function createBase58AddressWithSeed(
+    baseAddress: Base58EncodedAddress,
+    seed: string,
+    programAddress: Base58EncodedAddress
+): Promise<Base58EncodedAddress> {
+    const { serialize, deserialize } = getBase58EncodedAddressCodec();
+    const seedBytes = new TextEncoder().encode(seed);
+    const addressBytesBuffer = await crypto.subtle.digest(
+        'SHA-256',
+        new Uint8Array([...serialize(baseAddress), ...seedBytes, ...serialize(programAddress)])
+    );
+    const addressBytes = new Uint8Array(addressBytesBuffer);
+    return deserialize(addressBytes)[0];
+}