chore: add log to dump buffer info

Author: tp26610

packages/react-native-quick-crypto/cpp/utils/QuickCryptoUtils.cpp

@@ -1,13 +1,57 @@
 #include "QuickCryptoUtils.hpp"
+#include <iomanip>
 #include <openssl/bn.h>
 #include <openssl/core_names.h>
+#include <openssl/ec.h>
+#include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/param_build.h>
+#include <sstream>
 #include <stdexcept>
+#include <string>
 
 namespace margelo::nitro::crypto {
 
+static std::string getOpenSslErrors() {
+  std::ostringstream oss;
+  bool first = true;
+  unsigned long errCode = ERR_get_error();
+  while (errCode != 0) {
+    char buf[256];
+    ERR_error_string_n(errCode, buf, sizeof(buf));
+    if (!first)
+      oss << " | ";
+    oss << buf;
+    first = false;
+    errCode = ERR_get_error();
+  }
+  return first ? "none" : oss.str();
+}
+
+static std::string toHexByte(uint8_t b) {
+  std::ostringstream oss;
+  oss << "0x" << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(b);
+  return oss.str();
+}
+
 EVP_PKEY* createEcEvpPkey(const char* group_name, const uint8_t* pub_oct, size_t pub_len, const BIGNUM* priv_bn) {
+  // Clear stale OpenSSL errors before entering this routine.
+  ERR_clear_error();
+
+  int nid = OBJ_txt2nid(group_name);
+  bool pointDecodeOk = false;
+  if (nid != NID_undef && pub_oct != nullptr && pub_len > 0) {
+    EC_GROUP* group = EC_GROUP_new_by_curve_name(nid);
+    if (group != nullptr) {
+      EC_POINT* point = EC_POINT_new(group);
+      if (point != nullptr) {
+        pointDecodeOk = (EC_POINT_oct2point(group, point, pub_oct, pub_len, nullptr) == 1);
+        EC_POINT_free(point);
+      }
+      EC_GROUP_free(group);
+    }
+  }
+
   OSSL_PARAM_BLD* bld = OSSL_PARAM_BLD_new();
   if (!bld)
     throw std::runtime_error("Failed to create OSSL_PARAM_BLD");
@@ -31,9 +75,15 @@ EVP_PKEY* createEcEvpPkey(const char* group_name, const uint8_t* pub_oct, size_t
   int selection = priv_bn ? EVP_PKEY_KEYPAIR : EVP_PKEY_PUBLIC_KEY;
   EVP_PKEY* pkey = nullptr;
   if (EVP_PKEY_fromdata_init(ctx) <= 0 || EVP_PKEY_fromdata(ctx, &pkey, selection, params) <= 0) {
+    std::string errors = getOpenSslErrors();
+    std::ostringstream message;
+    message << "Failed to create EVP_PKEY from EC parameters"
+            << " (group=" << (group_name ? group_name : "null") << ", pub_len=" << pub_len
+            << ", pub_first=" << ((pub_oct != nullptr && pub_len > 0) ? toHexByte(pub_oct[0]) : "n/a")
+            << ", point_decode_ok=" << (pointDecodeOk ? "true" : "false") << ", openssl_errors=" << errors << ")";
     EVP_PKEY_CTX_free(ctx);
     OSSL_PARAM_free(params);
-    throw std::runtime_error("Failed to create EVP_PKEY from EC parameters");
+    throw std::runtime_error(message.str());
   }
 
   EVP_PKEY_CTX_free(ctx);