Crypto: Refactor hash computation

... by renaming HashGenerator to (incremental) Hasher and
dropping support for Git/MD5 hashes. The Hasher does not
expose the actual hash implementation.

1 files changed, 28 insertions, 0 deletions

diff --git a/test/buildtool/crypto/hasher.test.cpp b/test/buildtool/crypto/hasher.test.cpp
new file mode 100644
index 00000000..01a5cb12
--- /dev/null
+++ b/test/buildtool/crypto/hasher.test.cpp
@@ -0,0 +1,28 @@
+#include "catch2/catch.hpp"
+#include "src/buildtool/crypto/hasher.hpp"
+
+template <Hasher::HashType type>
+void test_increment_hash(std::string const& bytes, std::string const& result) {
+    Hasher hasher{type};
+    hasher.Update(bytes.substr(0, bytes.size() / 2));
+    hasher.Update(bytes.substr(bytes.size() / 2));
+    auto digest = std::move(hasher).Finalize();
+    CHECK(digest.HexString() == result);
+}
+
+TEST_CASE("Hasher", "[crypto]") {
+    std::string bytes{"test"};
+
+    SECTION("SHA-1") {
+        // same as: echo -n test | sha1sum
+        test_increment_hash<Hasher::HashType::SHA1>(
+            bytes, "a94a8fe5ccb19ba61c4c0873d391e987982fbbd3");
+    }
+
+    SECTION("SHA-256") {
+        // same as: echo -n test | sha256sum
+        test_increment_hash<Hasher::HashType::SHA256>(
+            bytes,
+            "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08");
+    }
+}