Add ADR-028 implementation and test CosmWasm contract addresses

packages/proto-signing/src/adr28.spec.ts

@@ -0,0 +1,28 @@
+import { Bech32 } from "@cosmjs/encoding";
+import { Uint64 } from "@cosmjs/math";
+
+import { moduleAddressRaw } from "./adr28";
+
+describe("adr28", () => {
+  describe("moduleAddressRaw", () => {
+    it("can be used for wasm contract address derivation", () => {
+      function contractAddressRaw(codeId: number, contractId: number): Uint8Array {
+        const key = new Uint8Array([
+          ...Uint64.fromNumber(codeId).toBytesBigEndian(),
+          ...Uint64.fromNumber(contractId).toBytesBigEndian(),
+        ]);
+        return moduleAddressRaw("wasm", key).slice(0, 20);
+      }
+
+      function contractAddress(codeId: number, contractId: number): string {
+        return Bech32.encode("cosmos", contractAddressRaw(codeId, contractId));
+      }
+
+      // Test vectors from https://github.com/CosmWasm/wasmd/pull/565
+      expect(contractAddress(1, 1)).toEqual("cosmos14hj2tavq8fpesdwxxcu44rty3hh90vhuc53mp6");
+      expect(contractAddress(1, 100)).toEqual("cosmos1mujpjkwhut9yjw4xueyugc02evfv46y04aervg");
+      expect(contractAddress(2 ** 32, 17)).toEqual("cosmos1673hrexz4h6s0ft04l96ygq667djzh2nvy7fsu");
+      expect(contractAddress(22, 2 ** 32)).toEqual("cosmos10q3pgfvmeyy0veekgtqhxujxkhz0vm9z65ckqh");
+    });
+  });
+});

packages/proto-signing/src/adr28.ts

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+import { Sha256, sha256 } from "@cosmjs/crypto";
+import { Bech32, toUtf8 } from "@cosmjs/encoding";
+
+/**
+ * Creates a basic address according to [ADR-028].
+ *
+ * This is called `Hash` in the document.
+ *
+ * [ADR-028]: https://github.com/cosmos/cosmos-sdk/blob/master/docs/architecture/adr-028-public-key-addresses.md
+ */
+export function basicAddressRaw(type: string, key: Uint8Array): Uint8Array {
+  const innerHash = sha256(toUtf8(type));
+  const outerHash = new Sha256(innerHash).update(key).digest();
+  // `A_LEN` is 32 and `hash` is sha256 so we avoid all the truncation clutter.
+  return outerHash;
+}
+
+/**
+ * Creates a raw (i.e. binary) module address accoding to [ADR-028].
+ *
+ * [ADR-028]: https://github.com/cosmos/cosmos-sdk/blob/master/docs/architecture/adr-028-public-key-addresses.md
+ */
+export function moduleAddressRaw(moduleName: string, key: Uint8Array): Uint8Array {
+  return basicAddressRaw("module", new Uint8Array([...toUtf8(moduleName), 0x00, ...key]));
+}
+
+/**
+ * Creates a bech32 encoded module address accoding to [ADR-028].
+ *
+ * [ADR-028]: https://github.com/cosmos/cosmos-sdk/blob/master/docs/architecture/adr-028-public-key-addresses.md
+ */
+export function moduleAddress(moduleName: string, key: Uint8Array, prefix: string): string {
+  return Bech32.encode(prefix, moduleAddressRaw(moduleName, key));
+}