Add checks that keyed algorithms are actually keyed before use

Previously calling update or encrypt without calling set_key first
would result in invalid outputs or else crashing.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/lib/stream/rc4/rc4.cpp b/src/lib/stream/rc4/rc4.cpp
index 208b2f560..60565d445 100644
--- a/src/lib/stream/rc4/rc4.cpp
+++ b/src/lib/stream/rc4/rc4.cpp
@@ -15,6 +15,8 @@ namespace Botan {
 */
 void RC4::cipher(const uint8_t in[], uint8_t out[], size_t length)
    {
+   verify_key_set(m_state.empty() == false);
+
    while(length >= m_buffer.size() - m_position)
       {
       xor_buf(out, in, &m_buffer[m_position], m_buffer.size() - m_position);