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/*
* OpenSSL RC4
* (C) 1999-2007,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/stream_cipher.h>
#if defined(BOTAN_HAS_OPENSSL) && defined(BOTAN_HAS_RC4)
#include <botan/internal/openssl.h>
#include <botan/parsing.h>
#include <botan/exceptn.h>
#include <openssl/rc4.h>
namespace Botan {
namespace {
class OpenSSL_RC4 final : public StreamCipher
{
public:
void clear() override { clear_mem(&m_rc4, 1); m_key_set = false; }
std::string provider() const override { return "openssl"; }
std::string name() const override
{
switch(m_skip)
{
case 0:
return "RC4";
case 256:
return "MARK-4";
default:
return "RC4(" + std::to_string(m_skip) + ")";
}
}
StreamCipher* clone() const override { return new OpenSSL_RC4(m_skip); }
Key_Length_Specification key_spec() const override
{
return Key_Length_Specification(1, 32);
}
explicit OpenSSL_RC4(size_t skip = 0) : m_skip(skip) { clear(); }
~OpenSSL_RC4() { clear(); }
void set_iv(const uint8_t*, size_t len) override
{
if(len > 0)
throw Exception("RC4 does not support an IV");
}
void seek(uint64_t) override
{
throw Not_Implemented("RC4 does not support seeking");
}
private:
void cipher(const uint8_t in[], uint8_t out[], size_t length) override
{
verify_key_set(m_key_set);
::RC4(&m_rc4, length, in, out);
}
void key_schedule(const uint8_t key[], size_t length) override
{
::RC4_set_key(&m_rc4, length, key);
uint8_t d = 0;
for(size_t i = 0; i != m_skip; ++i)
::RC4(&m_rc4, 1, &d, &d);
m_key_set = true;
}
size_t m_skip;
RC4_KEY m_rc4;
bool m_key_set;
};
}
std::unique_ptr<StreamCipher>
make_openssl_rc4(size_t skip)
{
return std::unique_ptr<StreamCipher>(new OpenSSL_RC4(skip));
}
}
#endif
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