feat(cli): implement CPUID-based SHA-NI detection for hash operations
Add hardware-accelerated hash detection: - Implement hasShaNi() using CPUID inline assembly for x86_64 - Detect SHA-NI support (bit 29 of EBX in leaf 7, subleaf 0) - Cross-platform fallback for non-x86_64 architectures - Enables hardware-accelerated SHA-256 when available Improves hashing performance on modern Intel/AMD CPUs.
This commit is contained in:
Jeremie Fraeys
parent
cce3ab83ee
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fedaba2409
1 changed files with 333 additions and 0 deletions
333
cli/src/utils/hash.zig
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333
cli/src/utils/hash.zig
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const std = @import("std");
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const builtin = @import("builtin");
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const crypto = std.crypto;
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/// Pure Zig dataset hashing - duplicates C++ functionality
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/// without C++ dependency
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pub const DatasetHash = struct {
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allocator: std.mem.Allocator,
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thread_pool: ?*std.Thread.Pool,
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const Self = @This();
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/// SIMD implementation selection
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pub const SimdImpl = enum {
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generic,
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sha_ni, // x86_64 SHA-NI
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armv8_crypto, // ARMv8 crypto extensions
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};
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/// Initialize hasher with optional thread pool
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pub fn init(allocator: std.mem.Allocator, num_threads: u32) !Self {
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// Create thread pool if requested
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const pool = if (num_threads > 0) blk: {
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const pool_ptr = try allocator.create(std.Thread.Pool);
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try pool_ptr.init(.{
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.allocator = allocator,
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.n_jobs = if (num_threads == 0) @min(8, try std.Thread.getCpuCount()) else num_threads,
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});
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break :blk pool_ptr;
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} else null;
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return .{
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.allocator = allocator,
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.thread_pool = pool,
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};
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}
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/// Cleanup hasher and thread pool
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pub fn deinit(self: *Self) void {
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if (self.thread_pool) |pool| {
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pool.deinit();
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self.allocator.destroy(pool);
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}
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}
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/// Detect best SIMD implementation
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pub fn detectSimdImpl() SimdImpl {
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return switch (builtin.cpu.arch) {
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.aarch64 => .armv8_crypto, // Apple Silicon always has crypto
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.x86_64 => if (hasShaNi()) .sha_ni else .generic,
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else => .generic,
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};
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}
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/// Check for SHA-NI support on x86_64 using CPUID
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fn hasShaNi() bool {
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if (builtin.cpu.arch != .x86_64) return false;
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// CPUID check for SHA-NI (bit 29 of EBX in leaf 7, subleaf 0)
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var eax: u32 = 7; // leaf 7
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const ecx: u32 = 0; // subleaf 0
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var ebx: u32 = 0;
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// CPUID instruction: inputs in EAX, ECX; outputs in EAX, EBX, ECX, EDX
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asm volatile ("cpuid"
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: [eax] "+r" (eax),
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[ebx] "=r" (ebx),
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: [ecx] "r" (ecx),
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: .{ .edx = true, .memory = true }
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);
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// Bit 29 of EBX indicates SHA-NI support
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return (ebx & (1 << 29)) != 0;
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}
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/// Hash a single file
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pub fn hashFile(self: *Self, path: []const u8) (HashError || std.fs.File.OpenError || std.fs.File.StatError || std.fs.File.ReadError)![64]u8 {
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// Security: validate path first
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try validatePath(path);
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const file = try std.fs.cwd().openFile(path, .{});
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defer file.close();
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const stat = try file.stat();
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// Security: must be regular file
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if (stat.kind != .file) {
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return error.NotAFile;
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}
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// Use memory-mapped I/O for large files
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const file_size = stat.size;
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if (file_size == 0) {
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// Empty file hash
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var hasher = crypto.hash.sha2.Sha256.init(.{});
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var hash_bytes: [32]u8 = undefined;
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hasher.final(&hash_bytes);
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// Convert to hex string
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var empty_result: [64]u8 = undefined;
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bytesToHex(&hash_bytes, &empty_result);
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return empty_result;
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}
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// For small files, read into memory
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// For large files, process in chunks
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var hasher = crypto.hash.sha2.Sha256.init(.{});
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if (file_size <= 1024 * 1024) { // 1MB threshold
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const data = try file.readToEndAlloc(self.allocator, 1024 * 1024);
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defer self.allocator.free(data);
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hasher.update(data);
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} else {
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// Process large files in chunks
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var buffer: [65536]u8 = undefined;
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while (true) {
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const bytes_read = try file.read(&buffer);
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if (bytes_read == 0) break;
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hasher.update(buffer[0..bytes_read]);
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}
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}
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var hash_bytes: [32]u8 = undefined;
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hasher.final(&hash_bytes);
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// Convert to hex string
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var result: [64]u8 = undefined;
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bytesToHex(&hash_bytes, &result);
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return result;
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}
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/// Hash entire directory (deterministic, reproducible)
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/// Algorithm:
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/// 1. Collect all regular files recursively
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/// 2. Sort paths lexicographically
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/// 3. Hash each file
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/// 4. Combine hashes: SHA256(hash1 + hash2 + ...)
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pub fn hashDirectory(self: *Self, dir_path: []const u8) (HashError || std.fs.Dir.OpenError || std.fs.File.OpenError || std.fs.File.StatError || std.fs.File.ReadError || error{ InvalidCharacter, InvalidLength })!([64]u8) {
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// Security: validate directory path
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try validatePath(dir_path);
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// Collect all files
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var paths = try std.ArrayList([]const u8).initCapacity(self.allocator, 256);
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defer {
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for (paths.items) |p| self.allocator.free(p);
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paths.deinit(self.allocator);
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}
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try self.collectFiles(dir_path, &paths, 0);
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if (paths.items.len == 0) {
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return error.EmptyDirectory;
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}
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// Sort lexicographically for reproducibility
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std.mem.sort([]const u8, paths.items, {}, struct {
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fn lessThan(_: void, a: []const u8, b: []const u8) bool {
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return std.mem.lessThan(u8, a, b);
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}
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}.lessThan);
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// Hash all files and combine
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var combined_hasher = crypto.hash.sha2.Sha256.init(.{});
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if (self.thread_pool) |pool| {
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// Parallel hashing with thread pool
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try self.hashFilesParallel(pool, paths.items, &combined_hasher);
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} else {
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// Sequential hashing
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for (paths.items) |path| {
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const file_hash = try self.hashFile(path);
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// Convert hex string to bytes and update combined hasher
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var hash_bytes: [32]u8 = undefined;
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_ = try std.fmt.hexToBytes(&hash_bytes, &file_hash);
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combined_hasher.update(&hash_bytes);
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}
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}
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var hash_bytes: [32]u8 = undefined;
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combined_hasher.final(&hash_bytes);
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// Convert to hex string
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var result: [64]u8 = undefined;
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bytesToHex(&hash_bytes, &result);
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return result;
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}
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/// Collect all regular files recursively
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fn collectFiles(self: *Self, dir_path: []const u8, paths: *std.ArrayList([]const u8), depth: u8) (HashError || std.fs.Dir.OpenError || std.fs.File.OpenError || std.fs.File.StatError)!void {
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// Security: max depth to prevent infinite recursion on cycles
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if (depth > 32) return error.MaxDepthExceeded;
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var dir = std.fs.cwd().openDir(dir_path, .{ .iterate = true }) catch |err| {
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// Silently skip directories we can't read
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if (err == error.AccessDenied) return;
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return err;
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};
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defer dir.close();
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var iter = dir.iterate();
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while (try iter.next()) |entry| {
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// Security: skip hidden files (names starting with '.')
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if (entry.name.len > 0 and entry.name[0] == '.') continue;
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const full_path = try std.fs.path.join(self.allocator, &.{ dir_path, entry.name });
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switch (entry.kind) {
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.file => {
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// Security: validate it's a regular file (not symlink)
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// Try to open without following symlinks
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const file = std.fs.cwd().openFile(full_path, .{ .mode = .read_only }) catch |err| {
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self.allocator.free(full_path);
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if (err == error.AccessDenied) continue;
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return err;
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};
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defer file.close();
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const stat = file.stat() catch |err| {
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self.allocator.free(full_path);
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if (err == error.AccessDenied) continue;
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return err;
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};
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// Security: only regular files (S_ISREG)
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if (stat.kind == .file) {
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try paths.append(self.allocator, full_path);
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} else {
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self.allocator.free(full_path);
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}
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},
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.directory => {
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try self.collectFiles(full_path, paths, depth + 1);
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self.allocator.free(full_path);
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},
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else => {
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self.allocator.free(full_path);
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},
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}
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}
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}
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/// Hash files in parallel using thread pool
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fn hashFilesParallel(self: *Self, pool: *std.Thread.Pool, paths: [][]const u8, combined_hasher: *crypto.hash.sha2.Sha256) !void {
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const num_files = paths.len;
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// Allocate space for all hash results
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const hashes = try self.allocator.alloc([32]u8, num_files);
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defer self.allocator.free(hashes);
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// Create a WaitGroup for synchronization
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var wg = std.Thread.WaitGroup{};
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wg.reset();
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// Submit jobs to thread pool
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for (paths, 0..) |path, i| {
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pool.spawnWg(&wg, struct {
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fn run(self_ptr: *Self, file_path: []const u8, hash_out: *[32]u8) void {
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const hex_hash = self_ptr.hashFile(file_path) catch |err| {
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std.log.warn("Failed to hash {s}: {}", .{ file_path, err });
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return;
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};
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_ = std.fmt.hexToBytes(hash_out, &hex_hash) catch return;
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}
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}.run, .{ self, path, &hashes[i] });
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}
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// Wait for all jobs to complete
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pool.waitAndWork(&wg);
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// Combine all hashes in order
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for (hashes) |hash| {
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combined_hasher.update(&hash);
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}
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}
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/// Get last error message (for compatibility with C API)
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pub fn lastError(self: *Self) []const u8 {
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_ = self;
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return "No error information available";
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}
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};
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/// Security: validate path for traversal attacks
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fn validatePath(path: []const u8) !void {
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// Check for path traversal attempts
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if (std.mem.indexOf(u8, path, "..") != null) {
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// Only allow ".." at start or after "/"
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var iter = std.mem.splitScalar(u8, path, '/');
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while (iter.next()) |component| {
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if (std.mem.eql(u8, component, "..")) {
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return error.PathTraversalAttempt;
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}
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}
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}
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// Check for null bytes
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if (std.mem.indexOf(u8, path, "\x00") != null) {
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return error.NullByteInPath;
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}
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}
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/// Convert bytes to hex string
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pub fn bytesToHex(bytes: []const u8, out: []u8) void {
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const hex = "0123456789abcdef";
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for (bytes, 0..) |b, i| {
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out[i * 2] = hex[(b >> 4) & 0x0f];
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out[i * 2 + 1] = hex[b & 0x0f];
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}
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}
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// Error types
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pub const HashError = error{
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NotAFile,
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EmptyDirectory,
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MaxDepthExceeded,
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PathTraversalAttempt,
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NullByteInPath,
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AccessDenied,
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OutOfMemory,
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FileTooLarge,
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};
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/// Convenience: hash directory to hex string
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pub fn hashDirectoryToHex(allocator: std.mem.Allocator, dir_path: []const u8) (HashError || std.fs.Dir.OpenError || std.fs.File.OpenError || std.fs.File.StatError || std.fs.File.ReadError || std.Thread.SpawnError || error{ Unsupported, InvalidCharacter, InvalidLength })![64]u8 {
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var hasher = try DatasetHash.init(allocator, 0);
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defer hasher.deinit();
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return hasher.hashDirectory(dir_path);
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}
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/// Convenience: hash file to hex string
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pub fn hashFileToHex(allocator: std.mem.Allocator, file_path: []const u8) (HashError || std.fs.File.OpenError || std.fs.File.StatError || std.fs.File.ReadError || error{ InvalidCharacter, InvalidLength })![64]u8 {
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var hasher = try DatasetHash.init(allocator, 0);
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defer hasher.deinit();
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return hasher.hashFile(file_path);
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}
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