diff --git a/blockchain_integration/pi_network/dapi/crypto/hash_based/crypto.h b/blockchain_integration/pi_network/dapi/crypto/hash_based/crypto.h
new file mode 100644
index 000000000..b1713cceb
--- /dev/null
+++ b/blockchain_integration/pi_network/dapi/crypto/hash_based/crypto.h
@@ -0,0 +1,27 @@
+#ifndef CRYPTO_H
+#define CRYPTO_H
+
+#include <iostream>
+#include <vector>
+#include <NTL/ZZ.h>
+#include <NTL/mat_ZZ.h>
+
+class Crypto {
+public:
+  Crypto();
+  ~Crypto();
+
+  // Hash functions
+  std::vector<NTL::ZZ> sha256(const std::vector<NTL::ZZ>& input);
+  std::vector<NTL::ZZ> keccak256(const std::vector<NTL::ZZ>& input);
+
+  // Digital signatures
+  std::vector<NTL::ZZ> sign(const std::vector<NTL::ZZ>& message, const NTL::ZZ& privateKey);
+  bool verify(const std::vector<NTL::ZZ>& message, const std::vector<NTL::ZZ>& signature, const NTL::ZZ& publicKey);
+
+private:
+  NTL::ZZ privateKey_;
+  NTL::ZZ publicKey_;
+};
+
+#endif  // CRYPTO_H