diff options
Diffstat (limited to 'src/modes/eax/eax.cpp')
| -rw-r--r-- | src/modes/eax/eax.cpp | 76 |
1 files changed, 39 insertions, 37 deletions
diff --git a/src/modes/eax/eax.cpp b/src/modes/eax/eax.cpp index c31a823cf..67465a776 100644 --- a/src/modes/eax/eax.cpp +++ b/src/modes/eax/eax.cpp @@ -1,7 +1,9 @@ -/************************************************* -* EAX Mode Encryption Source File * -* (C) 1999-2007 Jack Lloyd * -*************************************************/ +/* +* EAX Mode Encryption +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ #include <botan/eax.h> #include <botan/cmac.h> @@ -13,9 +15,9 @@ namespace Botan { namespace { -/************************************************* -* EAX MAC-based PRF * -*************************************************/ +/* +* EAX MAC-based PRF +*/ SecureVector<byte> eax_prf(byte tag, u32bit BLOCK_SIZE, MessageAuthenticationCode* mac, const byte in[], u32bit length) @@ -29,9 +31,9 @@ SecureVector<byte> eax_prf(byte tag, u32bit BLOCK_SIZE, } -/************************************************* -* EAX_Base Constructor * -*************************************************/ +/* +* EAX_Base Constructor +*/ EAX_Base::EAX_Base(BlockCipher* ciph, u32bit tag_size) : TAG_SIZE(tag_size ? tag_size / 8 : ciph->BLOCK_SIZE), @@ -48,9 +50,9 @@ EAX_Base::EAX_Base(BlockCipher* ciph, position = 0; } -/************************************************* -* Check if a keylength is valid for EAX * -*************************************************/ +/* +* Check if a keylength is valid for EAX +*/ bool EAX_Base::valid_keylength(u32bit n) const { if(!cipher->valid_keylength(n)) @@ -60,9 +62,9 @@ bool EAX_Base::valid_keylength(u32bit n) const return true; } -/************************************************* -* Set the EAX key * -*************************************************/ +/* +* Set the EAX key +*/ void EAX_Base::set_key(const SymmetricKey& key) { cipher->set_key(key); @@ -70,9 +72,9 @@ void EAX_Base::set_key(const SymmetricKey& key) header_mac = eax_prf(1, BLOCK_SIZE, mac, 0, 0); } -/************************************************* -* Do setup at the start of each message * -*************************************************/ +/* +* Do setup at the start of each message +*/ void EAX_Base::start_msg() { for(u32bit j = 0; j != BLOCK_SIZE - 1; ++j) @@ -80,9 +82,9 @@ void EAX_Base::start_msg() mac->update(2); } -/************************************************* -* Set the EAX nonce * -*************************************************/ +/* +* Set the EAX nonce +*/ void EAX_Base::set_iv(const InitializationVector& iv) { nonce_mac = eax_prf(0, BLOCK_SIZE, mac, iv.begin(), iv.length()); @@ -90,25 +92,25 @@ void EAX_Base::set_iv(const InitializationVector& iv) cipher->encrypt(state, buffer); } -/************************************************* -* Set the EAX header * -*************************************************/ +/* +* Set the EAX header +*/ void EAX_Base::set_header(const byte header[], u32bit length) { header_mac = eax_prf(1, BLOCK_SIZE, mac, header, length); } -/************************************************* -* Return the name of this cipher mode * -*************************************************/ +/* +* Return the name of this cipher mode +*/ std::string EAX_Base::name() const { return (cipher->name() + "/EAX"); } -/************************************************* -* Increment the counter and update the buffer * -*************************************************/ +/* +* Increment the counter and update the buffer +*/ void EAX_Base::increment_counter() { for(s32bit j = BLOCK_SIZE - 1; j >= 0; --j) @@ -118,9 +120,9 @@ void EAX_Base::increment_counter() position = 0; } -/************************************************* -* Encrypt in EAX mode * -*************************************************/ +/* +* Encrypt in EAX mode +*/ void EAX_Encryption::write(const byte input[], u32bit length) { u32bit copied = std::min(BLOCK_SIZE - position, length); @@ -151,9 +153,9 @@ void EAX_Encryption::write(const byte input[], u32bit length) position += length; } -/************************************************* -* Finish encrypting in EAX mode * -*************************************************/ +/* +* Finish encrypting in EAX mode +*/ void EAX_Encryption::end_msg() { SecureVector<byte> data_mac = mac->final(); |