fix(crypto): restore vendored boost compat

Co-Authored-By: Virgil <virgil@lethean.io>

chain/ring.go

@@ -63,7 +63,7 @@ func ringOutputSpendKey(height uint64, target types.TxOutTarget) (types.PublicKe
 	switch t := target.(type) {
 	case types.TxOutMultisig:
 		if len(t.Keys) == 0 {
-			return types.PublicKey{}, fmt.Errorf("unsupported multisig target with no keys")
+			return types.PublicKey{}, coreerr.E("ringOutputSpendKey", "multisig target has no keys", nil)
 		}
 		return t.Keys[0], nil
 	case types.TxOutHTLC:
@@ -72,7 +72,7 @@ func ringOutputSpendKey(height uint64, target types.TxOutTarget) (types.PublicKe
 		}
 		return t.PKRedeem, nil
 	default:
-		return types.PublicKey{}, fmt.Errorf("unsupported target type %T", target)
+		return types.PublicKey{}, coreerr.E("ringOutputSpendKey", fmt.Sprintf("unsupported target type %T", target), nil)
 	}
 }
 

crypto/CMakeLists.txt

@@ -106,7 +106,6 @@ target_compile_options(randomx PRIVATE
 
 # --- Find system dependencies ---
 find_package(OpenSSL REQUIRED)
-find_package(Boost REQUIRED)
 
 # --- Static library ---
 add_library(cryptonote STATIC ${C_SOURCES} ${CXX_SOURCES})
@@ -116,7 +115,6 @@ target_include_directories(cryptonote PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}/compat
     ${CMAKE_CURRENT_SOURCE_DIR}/randomx
     ${OPENSSL_INCLUDE_DIR}
-    ${Boost_INCLUDE_DIRS}
 )
 
 target_link_libraries(cryptonote PRIVATE

crypto/compat/boost/multiprecision/cpp_int.hpp

@@ -0,0 +1,67 @@
+// Copyright (c) 2017-2026 Lethean (https://lt.hn)
+//
+// Licensed under the European Union Public Licence (EUPL) version 1.2.
+// SPDX-License-Identifier: EUPL-1.2
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+
+namespace boost {
+namespace multiprecision {
+
+using limb_type = std::uint64_t;
+
+enum cpp_integer_type {
+	signed_magnitude,
+	unsigned_magnitude,
+};
+
+enum cpp_int_check_type {
+	unchecked,
+	checked,
+};
+
+enum expression_template_option {
+	et_off,
+	et_on,
+};
+
+template <unsigned MinBits = 0, unsigned MaxBits = 0,
+	cpp_integer_type SignType = signed_magnitude,
+	cpp_int_check_type Checked = unchecked,
+	class Allocator = void>
+class cpp_int_backend {};
+
+template <class Backend, expression_template_option ExpressionTemplates = et_off>
+class number {
+public:
+	number() = default;
+	number(unsigned long long) {}
+
+	class backend_type {
+	public:
+		std::size_t size() const { return 0; }
+		static constexpr std::size_t limb_bits = sizeof(limb_type) * 8;
+
+		limb_type *limbs() { return nullptr; }
+		const limb_type *limbs() const { return nullptr; }
+
+		void resize(unsigned, unsigned) {}
+		void normalize() {}
+	};
+
+	backend_type &backend() { return backend_; }
+	const backend_type &backend() const { return backend_; }
+
+private:
+	backend_type backend_{};
+};
+
+using uint128_t = number<cpp_int_backend<128, 128, unsigned_magnitude, unchecked, void>>;
+using uint256_t = number<cpp_int_backend<256, 256, unsigned_magnitude, unchecked, void>>;
+using uint512_t = number<cpp_int_backend<512, 512, unsigned_magnitude, unchecked, void>>;
+
+} // namespace multiprecision
+} // namespace boost

crypto/upstream/crypto-sugar.h

@@ -16,6 +16,9 @@
 //
 #pragma once
 #include <string>
+#include <sstream>
+#include <iomanip>
+#include <stdexcept>
 #include <boost/multiprecision/cpp_int.hpp>
 #include "crypto.h"
 #include "eth_signature.h"