diff options
Diffstat (limited to 'comm/third_party/botan/src/lib/mac/cbc_mac/cbc_mac.cpp')
-rw-r--r-- | comm/third_party/botan/src/lib/mac/cbc_mac/cbc_mac.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/mac/cbc_mac/cbc_mac.cpp b/comm/third_party/botan/src/lib/mac/cbc_mac/cbc_mac.cpp new file mode 100644 index 0000000000..ba403b564a --- /dev/null +++ b/comm/third_party/botan/src/lib/mac/cbc_mac/cbc_mac.cpp @@ -0,0 +1,99 @@ +/* +* CBC-MAC +* (C) 1999-2007 Jack Lloyd +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#include <botan/cbc_mac.h> + +namespace Botan { + +/* +* Update an CBC-MAC Calculation +*/ +void CBC_MAC::add_data(const uint8_t input[], size_t length) + { + verify_key_set(m_state.empty() == false); + + size_t xored = std::min(output_length() - m_position, length); + xor_buf(&m_state[m_position], input, xored); + m_position += xored; + + if(m_position < output_length()) + return; + + m_cipher->encrypt(m_state); + input += xored; + length -= xored; + while(length >= output_length()) + { + xor_buf(m_state, input, output_length()); + m_cipher->encrypt(m_state); + input += output_length(); + length -= output_length(); + } + + xor_buf(m_state, input, length); + m_position = length; + } + +/* +* Finalize an CBC-MAC Calculation +*/ +void CBC_MAC::final_result(uint8_t mac[]) + { + verify_key_set(m_state.empty() == false); + + if(m_position) + m_cipher->encrypt(m_state); + + copy_mem(mac, m_state.data(), m_state.size()); + zeroise(m_state); + m_position = 0; + } + +/* +* CBC-MAC Key Schedule +*/ +void CBC_MAC::key_schedule(const uint8_t key[], size_t length) + { + m_state.resize(m_cipher->block_size()); + m_cipher->set_key(key, length); + } + +/* +* Clear memory of sensitive data +*/ +void CBC_MAC::clear() + { + m_cipher->clear(); + zap(m_state); + m_position = 0; + } + +/* +* Return the name of this type +*/ +std::string CBC_MAC::name() const + { + return "CBC-MAC(" + m_cipher->name() + ")"; + } + +/* +* Return a clone of this object +*/ +MessageAuthenticationCode* CBC_MAC::clone() const + { + return new CBC_MAC(m_cipher->clone()); + } + +/* +* CBC-MAC Constructor +*/ +CBC_MAC::CBC_MAC(BlockCipher* cipher) : + m_cipher(cipher) + { + } + +} |