refactor(experimental): implement createAddressWithSeed

Author: 2501babe

packages/addresses/src/__tests__/program-derived-address-test.ts packages/addresses/src/__tests__/computed-address-test.ts

@@ -1,5 +1,5 @@
 import { Base58EncodedAddress } from '../base58';
-import { getProgramDerivedAddress } from '../program-derived-address';
+import { createAddressWithSeed, getProgramDerivedAddress } from '../computed-address';
 
 describe('getProgramDerivedAddress()', () => {
     it('fatals when supplied more than 16 seeds', async () => {
@@ -139,3 +139,38 @@ describe('getProgramDerivedAddress()', () => {
         'fatals when supplied a combination of program address and seeds for which no off-curve point can be found'
     );
 });
+
+describe('createAddressWithSeed', () => {
+    it('returns an address that is the SHA-256 hash of the concatenated base address, seed, and program address', async () => {
+        expect.assertions(2);
+        const baseAddress = 'Bh1uUDP3ApWLeccVNHwyQKpnfGQbuE2UECbGA6M4jiZJ' as Base58EncodedAddress;
+        const programAddress = 'FGrddpvjBUAG6VdV4fR8Q2hEZTHS6w4SEveVBgfwbfdm' as Base58EncodedAddress;
+        const expectedAddress = 'HUKxCeXY6gZohFJFARbLE6L6C9wDEHz1SfK8ENM7QY7z' as Base58EncodedAddress;
+
+        await expect(createAddressWithSeed({ baseAddress, programAddress, seed: 'seed' })).resolves.toEqual(
+            expectedAddress
+        );
+
+        await expect(
+            createAddressWithSeed({ baseAddress, programAddress, seed: new Uint8Array([0x73, 0x65, 0x65, 0x64]) })
+        ).resolves.toEqual(expectedAddress);
+    });
+    it('fails when the seed is longer than 32 bytes', async () => {
+        expect.assertions(1);
+        const baseAddress = 'Bh1uUDP3ApWLeccVNHwyQKpnfGQbuE2UECbGA6M4jiZJ' as Base58EncodedAddress;
+        const programAddress = 'FGrddpvjBUAG6VdV4fR8Q2hEZTHS6w4SEveVBgfwbfdm' as Base58EncodedAddress;
+
+        await expect(createAddressWithSeed({ baseAddress, programAddress, seed: 'a'.repeat(33) })).rejects.toThrow(
+            'The seed exceeds the maximum length of 32 bytes'
+        );
+    });
+    it('fails with a malicious programAddress meant to produce an address that would collide with a PDA', async () => {
+        expect.assertions(1);
+        const baseAddress = 'Bh1uUDP3ApWLeccVNHwyQKpnfGQbuE2UECbGA6M4jiZJ' as Base58EncodedAddress;
+        const programAddress = '4vJ9JU1bJJE96FbKdjWme2JfVK1knU936FHTDZV7AC2' as Base58EncodedAddress;
+
+        await expect(createAddressWithSeed({ baseAddress, programAddress, seed: 'seed' })).rejects.toThrow(
+            'programAddress cannot end with the PDA marker'
+        );
+    });
+});

packages/addresses/src/program-derived-address.ts packages/addresses/src/computed-address.ts

@@ -7,6 +7,13 @@ type PDAInput = Readonly<{
     programAddress: Base58EncodedAddress;
     seeds: Seed[];
 }>;
+
+type SeedInput = Readonly<{
+    baseAddress: Base58EncodedAddress;
+    programAddress: Base58EncodedAddress;
+    seed: Seed;
+}>;
+
 type Seed = string | Uint8Array;
 
 const MAX_SEED_LENGTH = 32;
@@ -76,3 +83,34 @@ export async function getProgramDerivedAddress({ programAddress, seeds }: PDAInp
     // TODO: Coded error.
     throw new Error('Unable to find a viable program address bump seed');
 }
+
+export async function createAddressWithSeed({
+    baseAddress,
+    programAddress,
+    seed,
+}: SeedInput): Promise<Base58EncodedAddress> {
+    const { serialize, deserialize } = getBase58EncodedAddressCodec();
+
+    const seedBytes = typeof seed === 'string' ? new TextEncoder().encode(seed) : seed;
+    if (seedBytes.byteLength > MAX_SEED_LENGTH) {
+        // TODO: Coded error.
+        throw new Error(`The seed exceeds the maximum length of 32 bytes`);
+    }
+
+    const programAddressBytes = serialize(programAddress);
+    if (
+        programAddressBytes.length >= PDA_MARKER_BYTES.length &&
+        programAddressBytes.slice(-PDA_MARKER_BYTES.length).every((byte, index) => byte === PDA_MARKER_BYTES[index])
+    ) {
+        // TODO: Coded error.
+        throw new Error(`programAddress cannot end with the PDA marker`);
+    }
+
+    const addressBytesBuffer = await crypto.subtle.digest(
+        'SHA-256',
+        new Uint8Array([...serialize(baseAddress), ...seedBytes, ...programAddressBytes])
+    );
+    const addressBytes = new Uint8Array(addressBytesBuffer);
+
+    return deserialize(addressBytes)[0];
+}

packages/addresses/src/index.ts

@@ -1,3 +1,3 @@
 export * from './base58';
-export * from './program-derived-address';
+export * from './computed-address';
 export * from './public-key';