Add encodeBech32Pubkey

packages/sdk/src/index.ts

@@ -7,4 +7,4 @@ export { unmarshalTx } from "./decoding";
 export { encodeSecp256k1Signature, makeSignBytes, marshalTx } from "./encoding";
 export { RestClient, TxsResponse } from "./restclient";
 export { makeCosmoshubPath, Pen, PrehashType, Secp256k1Pen } from "./pen";
-export { decodeBech32Pubkey, encodeSecp256k1Pubkey } from "./pubkey";
+export { decodeBech32Pubkey, encodeBech32Pubkey, encodeSecp256k1Pubkey } from "./pubkey";

packages/sdk/src/pubkey.spec.ts

@@ -1,6 +1,7 @@
 import { Encoding } from "@iov/encoding";
 
-import { decodeBech32Pubkey, encodeSecp256k1Pubkey } from "./pubkey";
+import { decodeBech32Pubkey, encodeBech32Pubkey, encodeSecp256k1Pubkey } from "./pubkey";
+import { PubKey } from "./types";
 
 const { fromBase64 } = Encoding;
 
@@ -35,4 +36,16 @@ describe("pubkey", () => {
       });
     });
   });
+
+  describe("encodeBech32Pubkey", () => {
+    it("works for secp256k1", () => {
+      const pubkey: PubKey = {
+        type: "tendermint/PubKeySecp256k1",
+        value: "A08EGB7ro1ORuFhjOnZcSgwYlpe0DSFjVNUIkNNQxwKQ",
+      };
+      expect(encodeBech32Pubkey(pubkey, "cosmospub")).toEqual(
+        "cosmospub1addwnpepqd8sgxq7aw348ydctp3n5ajufgxp395hksxjzc6565yfp56scupfqhlgyg5",
+      );
+    });
+  });
 });

packages/sdk/src/pubkey.ts

@@ -60,3 +60,18 @@ export function decodeBech32Pubkey(bech: Bech32PubKey): PubKey {
     throw new Error("Unsupported Pubkey type. Amino prefix: " + Encoding.toHex(aminoPrefix));
   }
 }
+
+export function encodeBech32Pubkey(pubkey: PubKey, prefix: CosmosPubkeyBech32Prefix): Bech32PubKey {
+  let aminoPrefix: Uint8Array;
+  switch (pubkey.type) {
+    // Note: please don't add cases here without writing additional unit tests
+    case pubkeyType.secp256k1:
+      aminoPrefix = pubkeyAminoPrefixSecp256k1;
+      break;
+    default:
+      throw new Error("Unsupported pubkey type");
+  }
+
+  const data = new Uint8Array([...aminoPrefix, ...Encoding.fromBase64(pubkey.value)]);
+  return Bech32.encode(prefix, data);
+}

packages/sdk/types/index.d.ts

@@ -6,4 +6,4 @@ export { unmarshalTx } from "./decoding";
 export { encodeSecp256k1Signature, makeSignBytes, marshalTx } from "./encoding";
 export { RestClient, TxsResponse } from "./restclient";
 export { makeCosmoshubPath, Pen, PrehashType, Secp256k1Pen } from "./pen";
-export { decodeBech32Pubkey, encodeSecp256k1Pubkey } from "./pubkey";
+export { decodeBech32Pubkey, encodeBech32Pubkey, encodeSecp256k1Pubkey } from "./pubkey";

packages/sdk/types/pubkey.d.ts

@@ -1,3 +1,5 @@
+import { CosmosPubkeyBech32Prefix } from "./address";
 import { Bech32PubKey, PubKey } from "./types";
 export declare function encodeSecp256k1Pubkey(pubkey: Uint8Array): PubKey;
 export declare function decodeBech32Pubkey(bech: Bech32PubKey): PubKey;
+export declare function encodeBech32Pubkey(pubkey: PubKey, prefix: CosmosPubkeyBech32Prefix): Bech32PubKey;