diff options
author | lloyd <[email protected]> | 2008-09-28 19:29:24 +0000 |
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committer | lloyd <[email protected]> | 2008-09-28 19:29:24 +0000 |
commit | 9bcfe627321ddc81691b835dffaa6324ac4684a4 (patch) | |
tree | fe5e8ae9813b853549558b59833022e87e83981b /src/mac/cbc_mac/cbc_mac.cpp | |
parent | 9822a701516396b7de4e41339faecd48ff8dc8ff (diff) |
Move all modules into src/ directory
Diffstat (limited to 'src/mac/cbc_mac/cbc_mac.cpp')
-rw-r--r-- | src/mac/cbc_mac/cbc_mac.cpp | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/mac/cbc_mac/cbc_mac.cpp b/src/mac/cbc_mac/cbc_mac.cpp new file mode 100644 index 000000000..d5275b0ed --- /dev/null +++ b/src/mac/cbc_mac/cbc_mac.cpp @@ -0,0 +1,109 @@ +/************************************************* +* CBC-MAC Source File * +* (C) 1999-2007 Jack Lloyd * +*************************************************/ + +#include <botan/cbc_mac.h> +#include <botan/lookup.h> +#include <botan/xor_buf.h> +#include <algorithm> + +namespace Botan { + +/************************************************* +* Update an CBC-MAC Calculation * +*************************************************/ +void CBC_MAC::add_data(const byte input[], u32bit length) + { + u32bit xored = std::min(OUTPUT_LENGTH - position, length); + xor_buf(state + position, input, xored); + position += xored; + + if(position < OUTPUT_LENGTH) + return; + + e->encrypt(state); + input += xored; + length -= xored; + while(length >= OUTPUT_LENGTH) + { + xor_buf(state, input, OUTPUT_LENGTH); + e->encrypt(state); + input += OUTPUT_LENGTH; + length -= OUTPUT_LENGTH; + } + + 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; + } + +} |