feat(flows_cred): bash encryption script

!3 #4

encrypt-flows-cred.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+#
+# Description:
+#     Encrypt flows_cred.json.tmp from the specified directory to flows_cred.json. You will be prompted for the encryption password.
+#
+# Usage:
+#     ./encrypt-flows-cred.sh {path to cred file, if PWD use '.'}
+#
+# Changelog:
+#     2023-08-15: Script creation.
+#
+
+echo -n "Please enter the flows_cred.json decryption key: ";
+read -s PASSWORD;
+echo;
+
+Rand=$(tr -dc 'A-Fa-f0-9' </dev/urandom | head -c 32);
+
+EncryptedData=$(cat $1/flows_cred.json.tmp | openssl enc -aes-256-ctr -e -a -A -iv $Rand -K `echo -n $PASSWORD | sha256sum | cut -c 1-64`)
+
+cat <<EOF > $1/flows_cred.json
+{
+    "$": "$Rand$EncryptedData"
+}
+EOF
+
+echo;
+
+rm $1/flows_cred.json.tmp;