diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cbc_mac.cpp | 108 | ||||
| -rw-r--r-- | src/def_alg.cpp | 2 |
2 files changed, 110 insertions, 0 deletions
diff --git a/src/cbc_mac.cpp b/src/cbc_mac.cpp new file mode 100644 index 000000000..e805c2aa7 --- /dev/null +++ b/src/cbc_mac.cpp @@ -0,0 +1,108 @@ +/************************************************* +* CBC-MAC Source File * +* (C) 1999-2007 The Botan Project * +*************************************************/ + +#include <botan/cbc_mac.h> +#include <botan/lookup.h> +#include <botan/bit_ops.h> +#include <algorithm> + +namespace Botan { + +/************************************************* +* Update an CBC-MAC Calculation * +*************************************************/ +void CBC_MAC::add_data(const byte input[], u32bit length) + { + u32bit xored = std::min(8 - position, length); + xor_buf(state + position, input, xored); + position += xored; + + if(position < 8) return; + + e->encrypt(state); + input += xored; + length -= xored; + while(length >= 8) + { + xor_buf(state, input, 8); + e->encrypt(state); + input += 8; + length -= 8; + } + + xor_buf(state, input, length); + position = length; + } + +/************************************************* +* Finalize an CBC-MAC Calculation * +*************************************************/ +void CBC_MAC::final_result(byte mac[]) + { + if(position) + e->encrypt(state); + + copy_mem(mac, state.begin(), state.size()); + state.clear(); + position = 0; + } + +/************************************************* +* CBC-MAC Key Schedule * +*************************************************/ +void CBC_MAC::key(const byte key[], u32bit length) + { + e->set_key(key, length); + } + +/************************************************* +* Clear memory of sensitive data * +*************************************************/ +void CBC_MAC::clear() throw() + { + e->clear(); + state.clear(); + position = 0; + } + +/************************************************* +* Return the name of this type * +*************************************************/ +std::string CBC_MAC::name() const + { + return "CBC-MAC(" + e->name() + ")"; + } + +/************************************************* +* Return a clone of this object * +*************************************************/ +MessageAuthenticationCode* CBC_MAC::clone() const + { + return new CBC_MAC(e->name()); + } + +/************************************************* +* CBC-MAC Constructor * +*************************************************/ +CBC_MAC::CBC_MAC(const std::string& cipher) : + MessageAuthenticationCode(block_size_of(cipher), + min_keylength_of(cipher), + max_keylength_of(cipher), + keylength_multiple_of(cipher)), + state(block_size_of(cipher)) + { + e = get_block_cipher(cipher); + position = 0; + } + +/************************************************* +* CBC-MAC Destructor * +*************************************************/ +CBC_MAC::~CBC_MAC() + { + delete e; + } + +} diff --git a/src/def_alg.cpp b/src/def_alg.cpp index 09ae5c978..2dbd30621 100644 --- a/src/def_alg.cpp +++ b/src/def_alg.cpp @@ -52,6 +52,7 @@ #include <botan/whrlpool.h> #include <botan/par_hash.h> +#include <botan/cbc_mac.h> #include <botan/cmac.h> #include <botan/hmac.h> #include <botan/x919_mac.h> @@ -219,6 +220,7 @@ Default_Engine::find_mac(const std::string& algo_spec) const return 0; const std::string algo_name = deref_alias(name[0]); + HANDLE_TYPE_ONE_STRING("CBC-MAC", CBC_MAC); HANDLE_TYPE_ONE_STRING("CMAC", CMAC); HANDLE_TYPE_ONE_STRING("HMAC", HMAC); HANDLE_TYPE_NO_ARGS("X9.19-MAC", ANSI_X919_MAC); |