diff --git a/std/crypto/test.zig b/std/crypto/test.zig
new file mode 100644
index 0000000000..a357988901
--- /dev/null
+++ b/std/crypto/test.zig
@@ -0,0 +1,22 @@
+const debug = @import("../debug/index.zig");
+const mem = @import("../mem.zig");
+const fmt = @import("../fmt/index.zig");
+
+// Hash using the specified hasher `H` asserting `expected == H(input)`.
+pub fn assertEqualHash(comptime Hasher: var, comptime expected: []const u8, input: []const u8) {
+    var h: [expected.len / 2]u8 = undefined;
+    Hasher.hash(input, h[0..]);
+
+    assertEqual(expected, h);
+}
+
+// Assert `expected` == `input` where `input` is a bytestring.
+pub fn assertEqual(comptime expected: []const u8, input: []const u8) {
+    var expected_bytes: [expected.len / 2]u8 = undefined;
+    for (expected_bytes) |*r, i| {
+        *r = fmt.parseInt(u8, expected[2*i .. 2*i+2], 16) catch unreachable;
+    }
+
+    debug.assert(mem.eql(u8, expected_bytes, input));
+}
+