Stratum V2 initial commit

src/models/sv2/sv2-authority-key.ts

@@ -0,0 +1,19 @@
+import * as bs58 from 'bs58';
+import * as crypto from 'crypto';
+
+const AUTHORITY_KEY_VERSION_PREFIX = Buffer.from([1, 0]);
+
+export function encodeSv2AuthorityPublicKey(publicKey: Buffer): string {
+  if (publicKey.length !== 32) {
+    throw new RangeError(`SV2 authority public key must be 32 bytes, got ${publicKey.length}`);
+  }
+
+  const versionedKey = Buffer.concat([AUTHORITY_KEY_VERSION_PREFIX, publicKey]);
+  const checksum = crypto
+    .createHash('sha256')
+    .update(crypto.createHash('sha256').update(versionedKey).digest())
+    .digest()
+    .subarray(0, 4);
+
+  return bs58.encode(Buffer.concat([versionedKey, checksum]));
+}