Add HashFunction::copy_state

See GH #1037

2 files changed, 6 insertions, 0 deletions

diff --git a/src/lib/hash/rmd160/rmd160.cpp b/src/lib/hash/rmd160/rmd160.cpp
index 8d190a74f..95f96c281 100644
--- a/src/lib/hash/rmd160/rmd160.cpp
+++ b/src/lib/hash/rmd160/rmd160.cpp
@@ -9,6 +9,11 @@
 
 namespace Botan {
 
+std::unique_ptr<HashFunction> RIPEMD_160::copy_state() const
+   {
+   return std::unique_ptr<HashFunction>(new RIPEMD_160(*this));
+   }
+
 namespace {
 
 /*
diff --git a/src/lib/hash/rmd160/rmd160.h b/src/lib/hash/rmd160/rmd160.h
index 9e2d1de87..f2b57ef33 100644
--- a/src/lib/hash/rmd160/rmd160.h
+++ b/src/lib/hash/rmd160/rmd160.h
@@ -21,6 +21,7 @@ class BOTAN_DLL RIPEMD_160 final : public MDx_HashFunction
       std::string name() const override { return "RIPEMD-160"; }
       size_t output_length() const override { return 20; }
       HashFunction* clone() const override { return new RIPEMD_160; }
+      std::unique_ptr<HashFunction> copy_state() const override;
 
       void clear() override;