Add BIP39 and BIP32 foundation tests (#83)

Co-authored-by: Gilcimar Duarte <ti@gpm.infra>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/bip32.h b/src/bip32.h
new file mode 100644
index 0000000..a029444
--- /dev/null
+++ b/src/bip32.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2026 Bitflash developers
+// Distributed under the MIT/X11 software license.
+//
+// BIP39/BIP32 primitives for deterministic wallet work.
+//
+// This module is deliberately independent from wallet.dat and GUI code. It is
+// the auditable foundation: mnemonic generation/validation, seed derivation,
+// and hardened private child derivation over secp256k1.
+
+#ifndef BITFLASH_BIP32_H
+#define BITFLASH_BIP32_H
+
+#include <string>
+#include <vector>
+
+namespace bitflash
+{
+
+struct BIP32PrivateNode
+{
+    std::vector<unsigned char> privateKey; // 32-byte scalar
+    std::vector<unsigned char> chainCode;  // 32 bytes
+};
+
+bool BIP39EntropyToMnemonic(const std::vector<unsigned char>& entropy,
+                            std::string& mnemonicOut,
+                            std::string& errorOut);
+
+bool BIP39GenerateMnemonic(std::string& mnemonicOut,
+                           std::string& errorOut,
+                           unsigned int entropyBytes = 16);
+
+bool BIP39ValidateMnemonic(const std::string& mnemonic,
+                           std::string& normalizedOut,
+                           std::string& errorOut);
+
+bool BIP39MnemonicToSeed(const std::string& mnemonic,
+                         const std::string& passphrase,
+                         std::vector<unsigned char>& seedOut,
+                         std::string& errorOut);
+
+bool BIP32MasterFromSeed(const std::vector<unsigned char>& seed,
+                         BIP32PrivateNode& nodeOut,
+                         std::string& errorOut);
+
+bool BIP32DeriveHardenedChild(const BIP32PrivateNode& parent,
+                              unsigned int childIndex,
+                              BIP32PrivateNode& childOut,
+                              std::string& errorOut);
+
+} // namespace bitflash
+
+#endif