Add HashFunction::copy_state

See GH #1037

2 files changed, 6 insertions, 0 deletions

diff --git a/src/lib/hash/checksum/adler32/adler32.cpp b/src/lib/hash/checksum/adler32/adler32.cpp
index b7f6356c4..329ba99a8 100644
--- a/src/lib/hash/checksum/adler32/adler32.cpp
+++ b/src/lib/hash/checksum/adler32/adler32.cpp
@@ -78,4 +78,9 @@ void Adler32::final_result(uint8_t output[])
    clear();
    }
 
+std::unique_ptr<HashFunction> Adler32::copy_state() const
+   {
+   return std::unique_ptr<HashFunction>(new Adler32(*this));
+   }
+
 }
diff --git a/src/lib/hash/checksum/adler32/adler32.h b/src/lib/hash/checksum/adler32/adler32.h
index eaf57c656..98ba4f91a 100644
--- a/src/lib/hash/checksum/adler32/adler32.h
+++ b/src/lib/hash/checksum/adler32/adler32.h
@@ -21,6 +21,7 @@ class BOTAN_DLL Adler32 final : public HashFunction
       std::string name() const override { return "Adler32"; }
       size_t output_length() const override { return 4; }
       HashFunction* clone() const override { return new Adler32; }
+      std::unique_ptr<HashFunction> copy_state() const override;
 
       void clear() override { m_S1 = 1; m_S2 = 0; }