Add Cosmos Hub (ATOM) support

Closes #452, thanks @conr2d

2 files changed, 26 insertions, 0 deletions

diff --git a/src/js/cosmos-util.js b/src/js/cosmos-util.js
new file mode 100644
index 0000000..a7f4605
--- /dev/null
+++ b/src/js/cosmos-util.js
@@ -0,0 +1,13 @@
+function CosmosBufferToPublic(pubBuf) {
+  const Buffer = libs.buffer.Buffer;
+  const AminoSecp256k1PubkeyPrefix = Buffer.from("EB5AE987", "hex");
+  const AminoSecp256k1PubkeyLength = Buffer.from("21", "hex");
+  pubBuf = Buffer.concat([AminoSecp256k1PubkeyPrefix, AminoSecp256k1PubkeyLength, pubBuf]);
+  return libs.bech32.encode("cosmospub", libs.bech32.toWords(pubBuf));
+}
+
+function CosmosBufferToAddress(pubBuf) {
+  const sha256_ed = libs.createHash("sha256").update(pubBuf).digest();
+  const ripemd160_ed = libs.createHash("rmd160").update(sha256_ed).digest();
+  return libs.bech32.encode("cosmos", libs.bech32.toWords(ripemd160_ed));
+}
diff --git a/src/js/index.js b/src/js/index.js
index 713b5e8..96fc451 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -1419,6 +1419,12 @@
                     privkey = FIObufferToPrivate(keyPair.d.toBuffer(32));
                 }
 
+                if (networks[DOM.network.val()].name == "ATOM - Cosmos Hub") {
+                    address = CosmosBufferToAddress(keyPair.getPublicKeyBuffer());
+                    pubkey = CosmosBufferToPublic(keyPair.getPublicKeyBuffer());
+                    privkey = keyPair.d.toBuffer().toString("base64");
+                }
+
                 //Groestlcoin Addresses are different
                 if(isGRS()) {
 
@@ -2235,6 +2241,13 @@
             },
         },
         {
+            name: "ATOM - Cosmos Hub",
+            onSelect: function() {
+                network = libs.bitcoin.networks.bitcoin;
+                setHdCoin(118);
+            },
+        },
+        {
             name: "AUR - Auroracoin",
             onSelect: function() {
                 network = libs.bitcoin.networks.auroracoin;