diff --git a/src/lib.zig b/src/lib.zig
index 9652d8214220a454ca07618f792457a6fb64ad01..7a441fa4457f706f8866ccd6337e8a4ac253b00b 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -139,48 +139,17 @@ pub fn fileSize(dir: std.fs.Dir, sub_path: string) !u64 {
     return s.size;
 }
 
-pub const HashFn = enum {
-    blake3,
-    gimli,
-    md5,
-    sha1,
-    sha224,
-    sha256,
-    sha384,
-    sha512,
-    sha3_224,
-    sha3_256,
-    sha3_384,
-    sha3_512,
-};
-
-pub fn hashFile(alloc: std.mem.Allocator, dir: std.fs.Dir, sub_path: string, comptime algo: HashFn) !string {
+pub fn hashFile(dir: std.fs.Dir, sub_path: string, comptime Algo: type) ![Algo.digest_length * 2]u8 {
     const file = try dir.openFile(sub_path, .{});
     defer file.close();
-    const hash = std.crypto.hash;
-    const Algo = switch (algo) {
-        .blake3 => hash.Blake3,
-        .gimli => hash.Gimli,
-        .md5 => hash.Md5,
-        .sha1 => hash.Sha1,
-        .sha224 => hash.sha2.Sha224,
-        .sha256 => hash.sha2.Sha256,
-        .sha384 => hash.sha2.Sha384,
-        .sha512 => hash.sha2.Sha512,
-        .sha3_224 => hash.sha3.Sha3_224,
-        .sha3_256 => hash.sha3.Sha3_256,
-        .sha3_384 => hash.sha3.Sha3_384,
-        .sha3_512 => hash.sha3.Sha3_512,
-    };
     var h = Algo.init(.{});
     var out: [Algo.digest_length]u8 = undefined;
     try pipe(file.reader(), h.writer());
     h.final(&out);
-
     var res: [Algo.digest_length * 2]u8 = undefined;
     var fbs = std.io.fixedBufferStream(&res);
     try std.fmt.format(fbs.writer(), "{x}", .{std.fmt.fmtSliceHexLower(&out)});
-    return try alloc.dupe(u8, &res);
+    return res;
 }
 
 pub fn pipe(reader_from: anytype, writer_to: anytype) !void {