ROT encoder/decoder

1 files changed, 41 insertions, 0 deletions

diff --git a/scripts/rot b/scripts/rot
new file mode 100755
index 0000000..8deafb6
--- /dev/null
+++ b/scripts/rot
@@ -0,0 +1,41 @@
+#!/bin/sh
+# Shell/AWK ROT cipher encoder/decoder
+# Written by: DrNuget
+# License: GNU GPL v2.0
+
+while [[ $# -gt 0 ]]; do
+	case $1 in
+		-n)
+			ROT="$2"
+			shift
+			shift
+			;;
+		*)
+			DATA="$DATA$1"
+			shift
+			;;
+	esac
+done
+
+echo "$DATA" | awk -vrot=$ROT -valph=$(echo -n {A..Z} , {a..z} | tr -d ' ') '
+BEGIN {
+	split(alph, alph_arr, ",");
+	for (j=1;j<=2;j++) {
+		cipher=substr(alph_arr[j], rot+1) substr(alph_arr[j], 1, rot);
+		for (i=0;i<26;i++) {
+			split(alph_arr[j], chars, "");
+			split(cipher, cipher_chars, "");
+			cipher_map[chars[i]]=cipher_chars[i];
+		}
+	}
+}
+
+{
+	result="";
+	split($0, chars, "");
+	for (i=1;i<=length($0);i++) {
+		result=result cipher_map[chars[i]];
+	}
+	print result;
+}
+'