diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 772f4168..bbb54390 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -74,6 +74,7 @@ add_library(libpl ${LIBRARY_TYPE}
         source/pl/lib/std/core.cpp
         source/pl/lib/std/hash.cpp
         source/pl/lib/std/random.cpp
+        source/pl/lib/std/crypto.cpp
         source/pl/core/resolvers.cpp
 )
 
diff --git a/lib/include/pl/lib/std/libstd.hpp b/lib/include/pl/lib/std/libstd.hpp
index 648f637e..ff8c25cd 100644
--- a/lib/include/pl/lib/std/libstd.hpp
+++ b/lib/include/pl/lib/std/libstd.hpp
@@ -17,6 +17,7 @@ namespace pl::lib::libstd {
     namespace core      { void registerFunctions(pl::PatternLanguage &runtime); }
     namespace hash      { void registerFunctions(pl::PatternLanguage &runtime); }
     namespace random    { void registerFunctions(pl::PatternLanguage &runtime); }
+    namespace crypto    { void registerFunctions(pl::PatternLanguage &runtime); }
 
     inline void registerFunctions(pl::PatternLanguage &runtime) {
         registerPragmas(runtime);
@@ -30,6 +31,7 @@ namespace pl::lib::libstd {
         core::registerFunctions(runtime);
         hash::registerFunctions(runtime);
         random::registerFunctions(runtime);
+        crypto::registerFunctions(runtime);
     }
 
 }
\ No newline at end of file
diff --git a/lib/source/pl/lib/std/crypto.cpp b/lib/source/pl/lib/std/crypto.cpp
new file mode 100644
index 00000000..fb58a9e2
--- /dev/null
+++ b/lib/source/pl/lib/std/crypto.cpp
@@ -0,0 +1,36 @@
+#include <numeric>
+
+#include <pl.hpp>
+
+
+namespace pl::lib::libstd::crypto {
+
+    void registerFunctions(pl::PatternLanguage &runtime) {
+        using FunctionParameterCount = pl::api::FunctionParameterCount;
+        using namespace pl::core;
+
+        api::Namespace nsStdMath = { "builtin", "std", "crypto" };
+        {
+            /* xor(buffer, key) */
+            runtime.addFunction(nsStdMath, "xor", FunctionParameterCount::exactly(2), [](Evaluator *, auto params) -> std::optional<Token::Literal> {
+                if (!params[0].isPattern() && !params[0].isString())
+                    pl::core::err::E0012.throwError("Only patterns and strings are supported for crypto::crc buffer.");
+
+                if (!params[1].isPattern() && !params[1].isString())
+                    pl::core::err::E0012.throwError("Only patterns and strings are supported for crypto::crc key.");
+
+                auto buffer = params[0].toBytes();
+                auto key    = params[1].toBytes();
+
+                auto result = buffer;
+
+                for (std::size_t i = 0; i < result.size(); ++i)
+                    result[i] ^= key[i % key.size()];
+
+                return std::string(result.begin(), result.end());
+            });
+
+        }
+    }
+
+}
\ No newline at end of file