Add HashFunction::copy_state

See GH #1037

6 files changed, 18 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; }
 
diff --git a/src/lib/hash/checksum/crc24/crc24.cpp b/src/lib/hash/checksum/crc24/crc24.cpp
index 923433d7e..bed456177 100644
--- a/src/lib/hash/checksum/crc24/crc24.cpp
+++ b/src/lib/hash/checksum/crc24/crc24.cpp
@@ -10,6 +10,11 @@
 
 namespace Botan {
 
+std::unique_ptr<HashFunction> CRC24::copy_state() const
+   {
+   return std::unique_ptr<HashFunction>(new CRC24(*this));
+   }
+
 /*
 * Update a CRC24 Checksum
 */
diff --git a/src/lib/hash/checksum/crc24/crc24.h b/src/lib/hash/checksum/crc24/crc24.h
index 95977bc48..203611b8f 100644
--- a/src/lib/hash/checksum/crc24/crc24.h
+++ b/src/lib/hash/checksum/crc24/crc24.h
@@ -21,6 +21,7 @@ class BOTAN_DLL CRC24 final : public HashFunction
       std::string name() const override { return "CRC24"; }
       size_t output_length() const override { return 3; }
       HashFunction* clone() const override { return new CRC24; }
+      std::unique_ptr<HashFunction> copy_state() const override;
 
       void clear() override { m_crc = 0xB704CE; }
 
diff --git a/src/lib/hash/checksum/crc32/crc32.cpp b/src/lib/hash/checksum/crc32/crc32.cpp
index 1bbc35ac8..c69c8f80b 100644
--- a/src/lib/hash/checksum/crc32/crc32.cpp
+++ b/src/lib/hash/checksum/crc32/crc32.cpp
@@ -10,6 +10,11 @@
 
 namespace Botan {
 
+std::unique_ptr<HashFunction> CRC32::copy_state() const
+   {
+   return std::unique_ptr<HashFunction>(new CRC32(*this));
+   }
+
 /*
 * Update a CRC32 Checksum
 */
diff --git a/src/lib/hash/checksum/crc32/crc32.h b/src/lib/hash/checksum/crc32/crc32.h
index fd9db1b3e..e1e266de3 100644
--- a/src/lib/hash/checksum/crc32/crc32.h
+++ b/src/lib/hash/checksum/crc32/crc32.h
@@ -21,6 +21,7 @@ class BOTAN_DLL CRC32 final : public HashFunction
       std::string name() const override { return "CRC32"; }
       size_t output_length() const override { return 4; }
       HashFunction* clone() const override { return new CRC32; }
+      std::unique_ptr<HashFunction> copy_state() const override;
 
       void clear() override { m_crc = 0xFFFFFFFF; }