Initial commit

src/main.zig

@@ -0,0 +1,44 @@
+const std = @import("std");
+const crypto = std.crypto;
+
+pub fn main() !void {
+    const allocator = std.heap.page_allocator;
+    const pwd = "Test123!";
+
+    var key: [32]u8 = std.mem.zeroes([32]u8);
+    var nonce: [24]u8 = undefined;
+
+    crypto.random.bytes(&nonce);
+
+    try crypto.pwhash.argon2.kdf(allocator, &key, pwd, &nonce, crypto.pwhash.argon2.Params.interactive_2id, crypto.pwhash.argon2.Mode.argon2id);
+    try encrypt("test.txt", key, nonce);
+}
+
+pub fn encrypt(path: []const u8, key: [32]u8, nonce: [24]u8) !void {
+    var file = try std.fs.cwd().openFile(path, .{});
+    defer file.close();
+    var out_buf: [512]u8 = undefined;
+    var in_buf: [512]u8 = undefined;
+
+    // missuse out_buf as buffer for format string
+    _ = try std.fmt.bufPrint(out_buf[0 .. path.len + 4], "{s}.cha", .{path});
+    var out_file = try std.fs.cwd().createFile(out_buf[0 .. path.len + 4], .{
+        .read = true,
+    });
+    defer out_file.close();
+
+    _ = try out_file.write(&nonce);
+
+    var counter: u32 = 0;
+    var read: usize = 0;
+    while (true) {
+        read = try file.read(&in_buf);
+        if (read <= 0) {
+            break;
+        }
+
+        crypto.stream.chacha.XChaCha20IETF.xor(out_buf[0..read], in_buf[0..read], counter, key, nonce);
+        counter += 1;
+        _ = try out_file.write(out_buf[0..read]);
+    }
+}