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diff --git a/src/Protocols/GameSpy0/algorithm.cpp b/src/Protocols/GameSpy0/algorithm.cpp
new file mode 100644
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--- /dev/null
+++ b/src/Protocols/GameSpy0/algorithm.cpp
@@ -0,0 +1,96 @@
+#include "securevalidate.h"
+
+/* This algorithm is based on Luigi Auriemma's gsmsalg 0.3.3,
+ * https://aluigi.altervista.org/papers/gsmsalg.h
+ * under GNU General Public License v2.
+ */
+QString generateValidateString(const QByteArray &cipher,
+                               const QByteArray &secure,
+                               const int        &enctype)
+{
+    unsigned char cipherLength = static_cast<unsigned char>( cipher.length() );
+    unsigned char secureLength = static_cast<unsigned char>( secure.length() );
+
+    // fill array with ascii characters
+    unsigned char enc[256];
+    for (unsigned short j = 0; j < 256; j++)
+    {
+        enc[j] = static_cast<unsigned char>(j);
+    }
+
+    // cipher shuffle
+    unsigned char a = 0, x;
+    for (unsigned short j = 0; j < 256; j++)
+    {
+        a += enc[j] + cipher[j % cipherLength];
+        x  = enc[a];
+        enc[a] = enc[j];
+        enc[j] = x;
+    }
+
+    // secure shuffle
+    unsigned char tmp[66];
+    unsigned char i = 0,
+                  y = 0,
+                  b = 0;
+                  a = 0; // reset a
+    for (i = 0; i < cipherLength; i++)
+    {
+        a += secure.at(i) + 1;
+        x = enc[a];
+        b += x;
+        y = enc[b];
+        enc[b] = x;
+        enc[a] = y;
+        tmp[i] = static_cast<unsigned char>( secure.at(i) ^ enc[ (x+y) & 0xff ] );
+    }
+
+    // part of the enctype 1-2 process (uses i from previous loop)
+    for (secureLength = i; secureLength % 3; secureLength++)
+    {
+        tmp[secureLength] = 0;
+    }
+
+    // enctype 1 shuffle
+    if (enctype == 1)
+    {
+        for (i = 0; i < secureLength; i++)
+        {
+            tmp[i] = enctype1_data[ tmp[i] ];
+        }
+    }
+    else if (enctype == 2 )
+    {
+        for (i = 0; i < secureLength; i++)
+        {
+            tmp[i] = static_cast<unsigned char>(tmp[i] ^ cipher[i % cipherLength] );
+        }
+    }
+
+    // final shuffle and stitch validate response together
+    unsigned char z = 0;
+    QString validate;
+    for (i = 0; i < secureLength; i += 3)
+    {
+        x = (tmp[i]);
+        y = (tmp[i+1]);
+        z = (tmp[i+2]);
+
+        validate.append( charshift (x >> 2) );
+        validate.append( charshift (static_cast<unsigned char>(((x & 3)  << 4) | (y >> 4)) ));
+        validate.append( charshift (static_cast<unsigned char>(((y & 15) << 2) | (z >> 6)) ));
+        validate.append( charshift (z & 63));
+    }
+    return validate;
+}
+
+// part of gsmsalg 0.3.3 and license
+unsigned char charshift ( const unsigned char &reg )
+{
+    if (reg <  26) return (reg + 'A');
+    if (reg <  52) return (reg + 'G');
+    if (reg <  62) return (reg - 4);
+    if (reg == 62) return ('+');
+    if (reg == 63) return ('/');
+    return (0);
+}