hash: add HashedSourceWriter

This class is the counterpart to CHashVerifier, in that it
writes data to an underlying source stream,
while keeping a hash of the written data.

Github-Pull: #26909
Rebased-From: da6c7aeca38e1d0ab5839a374c26af0504d603fc

1 files changed, 14 insertions, 0 deletions

diff --git a/src/test/streams_tests.cpp b/src/test/streams_tests.cpp
index 0925e2e9ee..e30ae845ef 100644
--- a/src/test/streams_tests.cpp
+++ b/src/test/streams_tests.cpp
@@ -441,4 +441,18 @@ BOOST_AUTO_TEST_CASE(streams_buffered_file_rand)
     fs::remove(streams_test_filename);
 }
 
+BOOST_AUTO_TEST_CASE(streams_hashed)
+{
+    CDataStream stream(SER_NETWORK, INIT_PROTO_VERSION);
+    HashedSourceWriter hash_writer{stream};
+    const std::string data{"bitcoin"};
+    hash_writer << data;
+
+    CHashVerifier hash_verifier{&stream};
+    std::string result;
+    hash_verifier >> result;
+    BOOST_CHECK_EQUAL(data, result);
+    BOOST_CHECK_EQUAL(hash_writer.GetHash(), hash_verifier.GetHash());
+}
+
 BOOST_AUTO_TEST_SUITE_END()