0-parameter fully tested for BFV

Author: Dongfang Zhao

src/pke/udf/hpdic_hermes.cpp

@@ -0,0 +1,73 @@
+#include <mysql.h>
+#include <iostream>
+#include "openfhe.h"
+
+using namespace lbcrypto;
+
+extern "C" {
+
+// MySQL UDF initialization function (optional)
+bool hermes_udf_init(UDF_INIT* initid, UDF_ARGS* args, char* message) {
+    return 0;
+}
+
+// Cleanup function (optional)
+void hermes_udf_deinit(UDF_INIT* initid) {}
+
+// Main UDF logic
+long long hermes_udf(UDF_INIT* initid, UDF_ARGS* args, char* is_null, char* error) {
+    try {
+        // Step 1: CryptoContext setup
+        CCParams<CryptoContextBFVRNS> parameters;
+        parameters.SetPlaintextModulus(65537);
+        parameters.SetMultiplicativeDepth(2);
+        CryptoContext<DCRTPoly> cc = GenCryptoContext(parameters);
+        cc->Enable(PKE);
+        cc->Enable(LEVELEDSHE);
+        cc->Enable(ADVANCEDSHE);  // 💥关键：EvalSum 等需要这个！
+
+        // Step 2: Key generation
+        auto kp = cc->KeyGen();
+        cc->EvalMultKeyGen(kp.secretKey);
+        cc->EvalSumKeyGen(kp.secretKey);  // Needed for inner product
+
+        // Step 3: Plaintext vectors
+        std::vector<int64_t> v1 = {3, 4, 5}; // Simulated column 1
+        std::vector<int64_t> v2 = {6, 7, 8}; // Simulated column 2
+
+        auto pt1 = cc->MakePackedPlaintext(v1);
+        auto pt2 = cc->MakePackedPlaintext(v2);
+
+        // Step 4: Encrypt
+        auto ct1 = cc->Encrypt(kp.publicKey, pt1);
+        auto ct2 = cc->Encrypt(kp.publicKey, pt2);
+
+        // Step 5: Multiply elementwise
+        auto ct_mul = cc->EvalMult(ct1, ct2);
+
+        // Step 6: Sum all slots to get inner product
+        auto ct_inner = cc->EvalSum(ct_mul, v1.size());
+
+        // Step 7: Decrypt
+        Plaintext pt_result;
+        cc->Decrypt(kp.secretKey, ct_inner, &pt_result);
+        pt_result->SetLength(1);  // All slots contain the same inner product after EvalSum
+
+        int64_t result = pt_result->GetPackedValue()[0];
+
+        std::cerr << "[hermes_udf] Inner product = " << result << std::endl;
+
+        return result;
+
+    } catch (const std::exception& e) {
+        std::cerr << "[hermes_udf] Exception: " << e.what() << std::endl;
+        *is_null = 1;
+        return 0;
+    } catch (...) {
+        std::cerr << "[hermes_udf] Unknown error" << std::endl;
+        *is_null = 1;
+        return 0;
+    }
+}
+
+}