Vigenère cipher: Difference between revisions

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@@ Line 318: / Line 318: @@
 <lang d>import std.stdio, std.string;
-string encrypt(string text, in string key) {
+string encrypt(string txt, in string key) {
-    string encoded;
+    string res;
-    foreach (i, c; text.toupper().removechars("^A-Z"))
+    foreach (c; txt.toupper) {
-        encoded ~= (c + key[i % $] - 2 * 'A') % 26 + 'A';
+        if (c < 'A' || c > 'Z') continue;
+        res ~= (c + key[res.length % $] - 2 * 'A') % 26 + 'A';
-    return encoded;
+    }
+    return res;
 }
-string decrypt(string encoded, in string key) {
+string decrypt(string txt, in string key) {
-    string decoded;
+    string res;
-    foreach (i, c; encoded.toupper().removechars("^A-Z"))
+    foreach (c; txt.toupper) {
-        decoded ~= (c - key[i % $] + 26) % 26 + 'A';
+        if (c < 'A' || c > 'Z') continue;
+        res ~= (c - key[res.length % $] + 26) % 26 + 'A';
-    return decoded;
+    }
+    return res;
 }