Support seeking in Salsa20

Add a test that StreamCipher::seek throws if not keyed.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/stream/ofb/ofb.cpp b/src/lib/stream/ofb/ofb.cpp
index 5a2d63dd4..75b7048aa 100644
--- a/src/lib/stream/ofb/ofb.cpp
+++ b/src/lib/stream/ofb/ofb.cpp
@@ -66,6 +66,6 @@ void OFB::set_iv(const uint8_t iv[], size_t iv_len)
 
 void OFB::seek(uint64_t)
    {
-   throw Exception("OFB does not support seeking");
+   throw Not_Implemented("OFB does not support seeking");
    }
 }