diff options
Diffstat (limited to 'comm/third_party/botan/src/lib/mac/x919_mac/x919_mac.cpp')
-rw-r--r-- | comm/third_party/botan/src/lib/mac/x919_mac/x919_mac.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/mac/x919_mac/x919_mac.cpp b/comm/third_party/botan/src/lib/mac/x919_mac/x919_mac.cpp new file mode 100644 index 0000000000..0cbf087959 --- /dev/null +++ b/comm/third_party/botan/src/lib/mac/x919_mac/x919_mac.cpp @@ -0,0 +1,99 @@ +/* +* ANSI X9.19 MAC +* (C) 1999-2007 Jack Lloyd +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#include <botan/x919_mac.h> + +namespace Botan { + +/* +* Update an ANSI X9.19 MAC Calculation +*/ +void ANSI_X919_MAC::add_data(const uint8_t input[], size_t length) + { + verify_key_set(m_state.empty() == false); + + size_t xored = std::min(8 - m_position, length); + xor_buf(&m_state[m_position], input, xored); + m_position += xored; + + if(m_position < 8) return; + + m_des1->encrypt(m_state); + input += xored; + length -= xored; + while(length >= 8) + { + xor_buf(m_state, input, 8); + m_des1->encrypt(m_state); + input += 8; + length -= 8; + } + + xor_buf(m_state, input, length); + m_position = length; + } + +/* +* Finalize an ANSI X9.19 MAC Calculation +*/ +void ANSI_X919_MAC::final_result(uint8_t mac[]) + { + if(m_position) + m_des1->encrypt(m_state); + m_des2->decrypt(m_state.data(), mac); + m_des1->encrypt(mac); + zeroise(m_state); + m_position = 0; + } + +/* +* ANSI X9.19 MAC Key Schedule +*/ +void ANSI_X919_MAC::key_schedule(const uint8_t key[], size_t length) + { + m_state.resize(8); + + m_des1->set_key(key, 8); + + if(length == 16) + key += 8; + + m_des2->set_key(key, 8); + } + +/* +* Clear memory of sensitive data +*/ +void ANSI_X919_MAC::clear() + { + m_des1->clear(); + m_des2->clear(); + zap(m_state); + m_position = 0; + } + +std::string ANSI_X919_MAC::name() const + { + return "X9.19-MAC"; + } + +MessageAuthenticationCode* ANSI_X919_MAC::clone() const + { + return new ANSI_X919_MAC; + } + +/* +* ANSI X9.19 MAC Constructor +*/ +ANSI_X919_MAC::ANSI_X919_MAC() : + m_des1(BlockCipher::create("DES")), + m_des2(m_des1->clone()), + m_position(0) + { + } + +} |