Adding StreamCipher::seek interface, supporting seek in ChaCha, and also adding ChaCha8 support

2 files changed, 6 insertions, 0 deletions

diff --git a/src/lib/stream/salsa20/salsa20.cpp b/src/lib/stream/salsa20/salsa20.cpp
index 1d3fe3d28..f11fe5e59 100644
--- a/src/lib/stream/salsa20/salsa20.cpp
+++ b/src/lib/stream/salsa20/salsa20.cpp
@@ -227,4 +227,8 @@ void Salsa20::clear()
    m_position = 0;
    }
 
+void Salsa20::seek(u64bit)
+   {
+   throw Not_Implemented("Salsa20::seek");
+   }
 }
diff --git a/src/lib/stream/salsa20/salsa20.h b/src/lib/stream/salsa20/salsa20.h
index 7e75470da..8256ea4db 100644
--- a/src/lib/stream/salsa20/salsa20.h
+++ b/src/lib/stream/salsa20/salsa20.h
@@ -33,6 +33,8 @@ class BOTAN_DLL Salsa20 final : public StreamCipher
       void clear() override;
       std::string name() const override;
       StreamCipher* clone() const override { return new Salsa20; }
+
+      void seek(u64bit offset) override;
    private:
       void key_schedule(const byte key[], size_t key_len) override;