Added scripts for hashing an input file

ReadMe.md

@@ -21,6 +21,7 @@ Description of relevant components:
 11) `withdrawRewards.sh` - withdraws the block rewards of a delegator.
 12) `finalizeUndelegate.sh` - finalizes an undelegate Id.
 13) `finalizeTransfer.sh` - finalizes a transfer Id.
+14) `hashFile.sh` - prints the blake-2b hash of the input file.
 
 How to use scripts
 ---
@@ -125,6 +126,14 @@ This script can be used to finalize a transfer.
 `caller_private_key` private key of the account making the transaction. Private key should start with `0x`. Both 32 and 64 byte keys are accepted as an input.<br />
 `transfer_Id` Id to finalize.<br />
 
+### hashFile.sh
+
+This script prints the blake-2b hash of the input file and can be used to generate the hash of the meta-data json file.
+
+**Usage:**
+
+```./registerPool.sh path_to_file```
+
 ### bootstrap.sh
 
 In order to run this

hashFile.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# -----------------------------------------------------------------------------
+# This script can be used to hash the pool meta-data json file.
+#
+# Usage: ./hashFile.sh path_to_file
+# -----------------------------------------------------------------------------
+TOOLS_JAR=Tools.jar
+
+file_path="$1"
+
+if [ $# -ne 1 ]
+then
+    echo "Invalid number of parameters."
+    echo "Usage: ./hashFile.sh path_to_file"
+    exit 1
+fi
+
+hash="$(java -cp $TOOLS_JAR cli.HashFile "$file_path")"
+echo "Meta-data content hash:"
+echo "$hash"

src/cli/HashFile.java

@@ -0,0 +1,28 @@
+package cli;
+
+import net.i2p.crypto.eddsa.Utils;
+import support.Blake2b;
+
+import java.io.File;
+import java.nio.file.Files;
+
+public class HashFile {
+
+    public static void main(String[] args) throws Exception {
+        if (0 == args.length) {
+            System.err.println("Usage: cli.HashFile FILE_PATH");
+            System.exit(1);
+        }
+
+        byte[] fileBytes = Files.readAllBytes(new File(args[0]).toPath());
+
+        byte[] hash = blake2b(fileBytes);
+        System.out.println("0x" + Utils.bytesToHex(hash));
+    }
+
+    public static byte[] blake2b(byte[] msg) {
+        Blake2b digest = Blake2b.Digest.newInstance(32);
+        digest.update(msg);
+        return digest.digest();
+    }
+}