diff --git a/blockchain_integration/pi_network/dapi/crypto/hash_based/crypto.cpp b/blockchain_integration/pi_network/dapi/crypto/hash_based/crypto.cpp
new file mode 100644
index 000000000..c44ef133e
--- /dev/null
+++ b/blockchain_integration/pi_network/dapi/crypto/hash_based/crypto.cpp
@@ -0,0 +1,31 @@
+#include "crypto.h"
+#include <NTL/SHA.h>
+#include <NTL/Keccak.h>
+
+Crypto::Crypto() {}
+
+Crypto::~Crypto() {}
+
+std::vector<NTL::ZZ> Crypto::sha256(const std::vector<NTL::ZZ>& input) {
+  NTL::SHA256 sha256;
+  sha256.update(input);
+  std::vector<NTL::ZZ> hash = sha256.final();
+  return hash;
+}
+
+std::vector<NTL::ZZ> Crypto::keccak256(const std::vector<NTL::ZZ>& input) {
+  NTL::Keccak keccak;
+  keccak.update(input);
+  std::vector<NTL::ZZ> hash = keccak.final();
+  return hash;
+}
+
+std::vector<NTL::ZZ> Crypto::sign(const std::vector<NTL::ZZ>& message, const NTL::ZZ& privateKey) {
+  // Implement digital signature algorithm (e.g. ECDSA)
+  return std::vector<NTL::ZZ>();
+}
+
+bool Crypto::verify(const std::vector<NTL::ZZ>& message, const std::vector<NTL::ZZ>& signature, const NTL::ZZ& publicKey) {
+  // Implement digital signature verification algorithm (e.g. ECDSA)
+  return true;
+}