point to fixed remote of zig-poseidon

Author: chetanyb

build.zig.zon

@@ -5,9 +5,8 @@
     .paths = .{""},
     .dependencies = .{
         .poseidon = .{
-            .url = "https://github.com/blockblaz/zig-poseidon/archive/refs/tags/v0.2.0.tar.gz",
-            .hash = "zig_poseidon-0.2.0-CHeW2H-SAAC83l4JGZOODgmgfEFpBa_KokE9oO3ilcf1",
+            .url = "https://github.com/blockblaz/zig-poseidon/archive/c2281f863a4c51c5f7e2957e266744e158ded6ca.tar.gz",
+            .hash = "zig_poseidon-0.2.0-CHeW2LS9AAB5ltpBgNJTHcTczmyAJjp7i_dwubSACNOR",
         },
-
     },
 }

src/poseidon_wrapper.zig

@@ -120,3 +120,29 @@ test "PoseidonHasher deterministic" {
 
     try std.testing.expectEqualSlices(u8, &output1, &output2);
 }
+
+test "PoseidonHasher different inputs produce different outputs" {
+    // Verify different inputs produce different outputs
+    const poseidon = @import("poseidon");
+    const Hasher = PoseidonHasher(poseidon.Poseidon2KoalaBear16);
+
+    var hasher1 = Hasher.init(.{});
+    var hasher2 = Hasher.init(.{});
+
+    const data1 = "first test data";
+    const data2 = "second test data";
+
+    hasher1.update(data1);
+    hasher2.update(data2);
+
+    var output1: [32]u8 = undefined;
+    var output2: [32]u8 = undefined;
+    hasher1.final(&output1);
+    hasher2.final(&output2);
+
+    // Verify outputs are different
+    const are_equal = std.mem.eql(u8, &output1, &output2);
+    try std.testing.expect(!are_equal);
+}
+
+