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diff --git a/src/lib/constructs/fpe_fe1/fpe_fe1.h b/src/lib/constructs/fpe_fe1/fpe_fe1.h
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+++ b/src/lib/constructs/fpe_fe1/fpe_fe1.h
@@ -0,0 +1,44 @@
+/*
+* Format Preserving Encryption (FE1 scheme)
+* (C) 2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_FPE_FE1_H__
+#define BOTAN_FPE_FE1_H__
+
+#include <botan/bigint.h>
+#include <botan/symkey.h>
+
+namespace Botan {
+
+namespace FPE {
+
+/**
+* Encrypt X from and onto the group Z_n using key and tweak
+* @param n the modulus
+* @param X the plaintext as a BigInt
+* @param key a random key
+* @param tweak will modify the ciphertext (think of as an IV)
+*/
+BigInt BOTAN_DLL fe1_encrypt(const BigInt& n, const BigInt& X,
+                             const SymmetricKey& key,
+                             const std::vector<byte>& tweak);
+
+/**
+* Decrypt X from and onto the group Z_n using key and tweak
+* @param n the modulus
+* @param X the ciphertext as a BigInt
+* @param key is the key used for encryption
+* @param tweak the same tweak used for encryption
+*/
+BigInt BOTAN_DLL fe1_decrypt(const BigInt& n, const BigInt& X,
+                             const SymmetricKey& key,
+                             const std::vector<byte>& tweak);
+
+}
+
+}
+
+#endif