Test intentionally misaligned inputs to hash functions

1 files changed, 18 insertions, 0 deletions

diff --git a/src/tests/test_hash.cpp b/src/tests/test_hash.cpp
index b3d2d2599..a36bf7214 100644
--- a/src/tests/test_hash.cpp
+++ b/src/tests/test_hash.cpp
@@ -125,6 +125,24 @@ class Hash_Function_Tests final : public Text_Based_Test
 
             result.test_eq(provider, "hashing after clear", hash->final(), expected);
 
+            // Test that misaligned inputs work
+
+            if(input.size() > 0)
+               {
+               std::vector<uint8_t> misaligned = input;
+               const size_t current_alignment = reinterpret_cast<uintptr_t>(misaligned.data()) % 16;
+
+               const size_t bytes_to_misalign = 15 - current_alignment;
+
+               for(size_t i = 0; i != bytes_to_misalign; ++i)
+                  misaligned.insert(misaligned.begin(), 0x23);
+
+               const size_t misalignment = reinterpret_cast<uintptr_t>(&misaligned[bytes_to_misalign]) % 16;
+               result.test_eq("Misaligned input to 15 % 16", misalignment, 15);
+               hash->update(&misaligned[bytes_to_misalign], input.size());
+               result.test_eq(provider, "hashing misaligned data", hash->final(), expected);
+               }
+
             if(input.size() > 5)
                {
                hash->update(input[0]);