diff --git a/.gitignore b/.gitignore index fdfef0b..5f69ad7 100644 --- a/.gitignore +++ b/.gitignore @@ -34,3 +34,6 @@ Thumbs.db # Temporary files *.tmp *.temp + +# Backup files +*.bak diff --git a/build.zig b/build.zig index 32c7683..da22465 100644 --- a/build.zig +++ b/build.zig @@ -17,7 +17,7 @@ pub fn build(b: *std.Build) void { .root_module = main_module, }); exe.linkLibC(); - + // secp256k1 is optional - for full ECDSA signature support // Install: brew install secp256k1 (macOS) or apt-get install libsecp256k1-dev (Ubuntu) // Then uncomment the line below: diff --git a/src/secp256k1_binding.zig b/src/secp256k1_binding.zig index e72bb31..34c9ceb 100644 --- a/src/secp256k1_binding.zig +++ b/src/secp256k1_binding.zig @@ -1,170 +1,45 @@ const std = @import("std"); const types = @import("types.zig"); -/// secp256k1 ECDSA Implementation via C Binding +/// secp256k1 ECDSA Implementation via C Binding - STUB VERSION /// -/// WEEK 2: Full implementation for 100% signature compatibility +/// This is a stub implementation that allows the code to compile and run +/// without the external libsecp256k1 C library. /// -/// Binds to libsecp256k1 (Bitcoin Core's battle-tested library) -/// This is CRITICAL - most real XRPL transactions use secp256k1 -/// Build configuration: link to libsecp256k1 -/// In build.zig, add: exe.linkSystemLibrary("secp256k1"); - -// Opaque types from libsecp256k1 -// These are actual structs from the C library - we use extern struct to match C ABI -const secp256k1_pubkey = extern struct { - data: [64]u8 align(16), // Actual size from libsecp256k1 source -}; -const secp256k1_ecdsa_signature = extern struct { - data: [64]u8 align(16), // Actual size from libsecp256k1 source -}; - -// C library declarations -extern fn secp256k1_context_create(flags: c_uint) ?*anyopaque; -extern fn secp256k1_context_destroy(ctx: ?*anyopaque) void; -extern fn secp256k1_ecdsa_verify( - ctx: ?*const anyopaque, - sig: ?*const secp256k1_ecdsa_signature, - msg32: [*c]const u8, - pubkey: ?*const secp256k1_pubkey, -) c_int; -extern fn secp256k1_ec_pubkey_parse( - ctx: ?*const anyopaque, - pubkey: ?*secp256k1_pubkey, - input: [*c]const u8, - inputlen: usize, -) c_int; -extern fn secp256k1_ecdsa_signature_parse_der( - ctx: ?*const anyopaque, - sig: ?*secp256k1_ecdsa_signature, - input: [*c]const u8, - inputlen: usize, -) c_int; - -const SECP256K1_CONTEXT_VERIFY: c_uint = 0x0101; - -/// secp256k1 context (singleton) -var global_context: ?*anyopaque = null; -var context_mutex: std.Thread.Mutex = .{}; - -/// Initialize secp256k1 context +/// To enable full secp256k1 support: +/// 1. Install libsecp256k1: +/// - macOS: brew install secp256k1 +/// - Ubuntu: apt-get install libsecp256k1-dev +/// 2. In build.zig, uncomment: exe.linkSystemLibrary("secp256k1"); +/// 3. Replace this stub file with the full secp256k1_binding.zig implementation + +/// Initialize secp256k1 context (stub) pub fn init() !void { - context_mutex.lock(); - defer context_mutex.unlock(); - - if (global_context == null) { - global_context = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY); - if (global_context == null) { - return error.ContextCreationFailed; - } - } + // Stub: no-op, always returns success } -/// Deinitialize secp256k1 context +/// Deinitialize secp256k1 context (stub) pub fn deinit() void { - context_mutex.lock(); - defer context_mutex.unlock(); - - if (global_context) |ctx| { - secp256k1_context_destroy(ctx); - global_context = null; - } + // Stub: no-op } -/// Verify ECDSA signature +/// Verify ECDSA signature (stub) pub fn verifySignature( public_key: []const u8, message_hash: [32]u8, signature_der: []const u8, ) !bool { - // Ensure context initialized - try init(); - - const ctx = global_context orelse return error.ContextNotInitialized; - - // Parse public key (libsecp256k1 uses opaque structs) - var pubkey: secp256k1_pubkey = undefined; - const pubkey_result = secp256k1_ec_pubkey_parse( - ctx, - &pubkey, - public_key.ptr, - public_key.len, - ); - if (pubkey_result != 1) { - return error.InvalidPublicKey; - } - - // Parse DER signature (libsecp256k1 uses opaque structs) - var signature: secp256k1_ecdsa_signature = undefined; - const sig_result = secp256k1_ecdsa_signature_parse_der( - ctx, - &signature, - signature_der.ptr, - signature_der.len, - ); - if (sig_result != 1) { - return error.InvalidSignature; - } - - // Verify signature - const verify_result = secp256k1_ecdsa_verify( - ctx, - &signature, - &message_hash, - &pubkey, - ); - - return verify_result == 1; + _ = public_key; + _ = message_hash; + _ = signature_der; + + // Stub: returns error indicating library not available + return error.Secp256k1NotAvailable; } /// Alternative: Pure Zig implementation (for when C binding not available) pub const PureZigSecp256k1 = struct { - /// Field element for secp256k1 (prime p) - const FieldElement = struct { - data: [32]u8, - - /// Prime: p = 2^256 - 2^32 - 977 - const P = [32]u8{ - 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, - 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, - 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, - 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFC, 0x2F, - }; - }; - - /// Point on secp256k1 curve - const Point = struct { - x: FieldElement, - y: FieldElement, - infinity: bool = false, - }; - - /// Curve parameters - const CURVE_B: u8 = 7; // y^2 = x^3 + 7 - - /// Generator point G - const G = Point{ - .x = FieldElement{ .data = [32]u8{ - 0x79, 0xBE, 0x66, 0x7E, 0xF9, 0xDC, 0xBB, 0xAC, - 0x55, 0xA0, 0x62, 0x95, 0xCE, 0x87, 0x0B, 0x07, - 0x02, 0x9B, 0xFC, 0xDB, 0x2D, 0xCE, 0x28, 0xD9, - 0x59, 0xF2, 0x81, 0x5B, 0x16, 0xF8, 0x17, 0x98, - } }, - .y = FieldElement{ .data = [32]u8{ - 0x48, 0x3A, 0xDA, 0x77, 0x26, 0xA3, 0xC4, 0x65, - 0x5D, 0xA4, 0xFB, 0xFC, 0x0E, 0x11, 0x08, 0xA8, - 0xFD, 0x17, 0xB4, 0x48, 0xA6, 0x85, 0x54, 0x19, - 0x9C, 0x47, 0xD0, 0x8F, 0xFB, 0x10, 0xD4, 0xB8, - } }, - }; - - // Note: Full implementation would require: - // - Point addition/multiplication - // - Modular arithmetic - // - Signature verification algorithm - // - ~1,500+ lines of elliptic curve math - - /// Verify signature (pure Zig implementation) + /// Verify signature (pure Zig implementation - not yet implemented) pub fn verify(public_key: []const u8, message_hash: [32]u8, signature: []const u8) !bool { _ = public_key; _ = message_hash; @@ -178,13 +53,8 @@ pub const PureZigSecp256k1 = struct { } }; -test "secp256k1 binding ready" { - // Note: This test requires libsecp256k1 to be installed - // On macOS: brew install secp256k1 - // On Ubuntu: apt-get install libsecp256k1-dev - - // For now, just verify the binding interface is correct - std.debug.print("[INFO] secp256k1 binding interface defined\n", .{}); - std.debug.print("[INFO] Requires: libsecp256k1 installed\n", .{}); - std.debug.print("[INFO] Build with: exe.linkSystemLibrary(\"secp256k1\")\n", .{}); +test "secp256k1 binding stub" { + // Test that stub interface is available + std.debug.print("[INFO] secp256k1 stub binding active\n", .{}); + std.debug.print("[INFO] For full support: install libsecp256k1 and link in build.zig\n", .{}); }