diff options
author | Tycho <work.tycho+git@gmail.com> | 2014-01-26 15:28:51 +0100 |
---|---|---|
committer | Tycho <work.tycho+git@gmail.com> | 2014-01-26 15:28:51 +0100 |
commit | bed2ee22e8283a2e8bd0790a89124839319c2fc3 (patch) | |
tree | ee9e66a7b7c63995797a502f209079c1422ce9c9 /lib/cryptopp/modes.cpp | |
parent | Refactored cBlockHandler::OnUse and dependents (diff) | |
parent | Merge pull request #589 from mc-server/minecartimprovements (diff) | |
download | cuberite-bed2ee22e8283a2e8bd0790a89124839319c2fc3.tar cuberite-bed2ee22e8283a2e8bd0790a89124839319c2fc3.tar.gz cuberite-bed2ee22e8283a2e8bd0790a89124839319c2fc3.tar.bz2 cuberite-bed2ee22e8283a2e8bd0790a89124839319c2fc3.tar.lz cuberite-bed2ee22e8283a2e8bd0790a89124839319c2fc3.tar.xz cuberite-bed2ee22e8283a2e8bd0790a89124839319c2fc3.tar.zst cuberite-bed2ee22e8283a2e8bd0790a89124839319c2fc3.zip |
Diffstat (limited to 'lib/cryptopp/modes.cpp')
-rw-r--r-- | lib/cryptopp/modes.cpp | 245 |
1 files changed, 0 insertions, 245 deletions
diff --git a/lib/cryptopp/modes.cpp b/lib/cryptopp/modes.cpp deleted file mode 100644 index 46332284b..000000000 --- a/lib/cryptopp/modes.cpp +++ /dev/null @@ -1,245 +0,0 @@ -// modes.cpp - written and placed in the public domain by Wei Dai - -#include "pch.h" - -#ifndef CRYPTOPP_IMPORTS - -#include "modes.h" - -#ifndef NDEBUG -#include "des.h" -#endif - -NAMESPACE_BEGIN(CryptoPP) - -#ifndef NDEBUG -void Modes_TestInstantiations() -{ - CFB_Mode<DES>::Encryption m0; - CFB_Mode<DES>::Decryption m1; - OFB_Mode<DES>::Encryption m2; - CTR_Mode<DES>::Encryption m3; - ECB_Mode<DES>::Encryption m4; - CBC_Mode<DES>::Encryption m5; -} -#endif - -void CFB_ModePolicy::Iterate(byte *output, const byte *input, CipherDir dir, size_t iterationCount) -{ - assert(m_cipher->IsForwardTransformation()); // CFB mode needs the "encrypt" direction of the underlying block cipher, even to decrypt - assert(m_feedbackSize == BlockSize()); - - unsigned int s = BlockSize(); - if (dir == ENCRYPTION) - { - m_cipher->ProcessAndXorBlock(m_register, input, output); - m_cipher->AdvancedProcessBlocks(output, input+s, output+s, (iterationCount-1)*s, 0); - memcpy(m_register, output+(iterationCount-1)*s, s); - } - else - { - memcpy(m_temp, input+(iterationCount-1)*s, s); // make copy first in case of in-place decryption - m_cipher->AdvancedProcessBlocks(input, input+s, output+s, (iterationCount-1)*s, BlockTransformation::BT_ReverseDirection); - m_cipher->ProcessAndXorBlock(m_register, input, output); - memcpy(m_register, m_temp, s); - } -} - -void CFB_ModePolicy::TransformRegister() -{ - assert(m_cipher->IsForwardTransformation()); // CFB mode needs the "encrypt" direction of the underlying block cipher, even to decrypt - m_cipher->ProcessBlock(m_register, m_temp); - unsigned int updateSize = BlockSize()-m_feedbackSize; - memmove_s(m_register, m_register.size(), m_register+m_feedbackSize, updateSize); - memcpy_s(m_register+updateSize, m_register.size()-updateSize, m_temp, m_feedbackSize); -} - -void CFB_ModePolicy::CipherResynchronize(const byte *iv, size_t length) -{ - assert(length == BlockSize()); - CopyOrZero(m_register, iv, length); - TransformRegister(); -} - -void CFB_ModePolicy::SetFeedbackSize(unsigned int feedbackSize) -{ - if (feedbackSize > BlockSize()) - throw InvalidArgument("CFB_Mode: invalid feedback size"); - m_feedbackSize = feedbackSize ? feedbackSize : BlockSize(); -} - -void CFB_ModePolicy::ResizeBuffers() -{ - CipherModeBase::ResizeBuffers(); - m_temp.New(BlockSize()); -} - -void OFB_ModePolicy::WriteKeystream(byte *keystreamBuffer, size_t iterationCount) -{ - assert(m_cipher->IsForwardTransformation()); // OFB mode needs the "encrypt" direction of the underlying block cipher, even to decrypt - unsigned int s = BlockSize(); - m_cipher->ProcessBlock(m_register, keystreamBuffer); - if (iterationCount > 1) - m_cipher->AdvancedProcessBlocks(keystreamBuffer, NULL, keystreamBuffer+s, s*(iterationCount-1), 0); - memcpy(m_register, keystreamBuffer+s*(iterationCount-1), s); -} - -void OFB_ModePolicy::CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length) -{ - assert(length == BlockSize()); - CopyOrZero(m_register, iv, length); -} - -void CTR_ModePolicy::SeekToIteration(lword iterationCount) -{ - int carry=0; - for (int i=BlockSize()-1; i>=0; i--) - { - unsigned int sum = m_register[i] + byte(iterationCount) + carry; - m_counterArray[i] = (byte) sum; - carry = sum >> 8; - iterationCount >>= 8; - } -} - -void CTR_ModePolicy::IncrementCounterBy256() -{ - IncrementCounterByOne(m_counterArray, BlockSize()-1); -} - -void CTR_ModePolicy::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount) -{ - assert(m_cipher->IsForwardTransformation()); // CTR mode needs the "encrypt" direction of the underlying block cipher, even to decrypt - unsigned int s = BlockSize(); - unsigned int inputIncrement = input ? s : 0; - - while (iterationCount) - { - byte lsb = m_counterArray[s-1]; - size_t blocks = UnsignedMin(iterationCount, 256U-lsb); - m_cipher->AdvancedProcessBlocks(m_counterArray, input, output, blocks*s, BlockTransformation::BT_InBlockIsCounter|BlockTransformation::BT_AllowParallel); - if ((m_counterArray[s-1] = lsb + (byte)blocks) == 0) - IncrementCounterBy256(); - - output += blocks*s; - input += blocks*inputIncrement; - iterationCount -= blocks; - } -} - -void CTR_ModePolicy::CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length) -{ - assert(length == BlockSize()); - CopyOrZero(m_register, iv, length); - m_counterArray = m_register; -} - -void BlockOrientedCipherModeBase::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms) -{ - m_cipher->SetKey(key, length, params); - ResizeBuffers(); - if (IsResynchronizable()) - { - size_t ivLength; - const byte *iv = GetIVAndThrowIfInvalid(params, ivLength); - Resynchronize(iv, (int)ivLength); - } -} - -void ECB_OneWay::ProcessData(byte *outString, const byte *inString, size_t length) -{ - assert(length%BlockSize()==0); - m_cipher->AdvancedProcessBlocks(inString, NULL, outString, length, BlockTransformation::BT_AllowParallel); -} - -void CBC_Encryption::ProcessData(byte *outString, const byte *inString, size_t length) -{ - if (!length) - return; - assert(length%BlockSize()==0); - - unsigned int blockSize = BlockSize(); - m_cipher->AdvancedProcessBlocks(inString, m_register, outString, blockSize, BlockTransformation::BT_XorInput); - if (length > blockSize) - m_cipher->AdvancedProcessBlocks(inString+blockSize, outString, outString+blockSize, length-blockSize, BlockTransformation::BT_XorInput); - memcpy(m_register, outString + length - blockSize, blockSize); -} - -void CBC_CTS_Encryption::ProcessLastBlock(byte *outString, const byte *inString, size_t length) -{ - if (length <= BlockSize()) - { - if (!m_stolenIV) - throw InvalidArgument("CBC_Encryption: message is too short for ciphertext stealing"); - - // steal from IV - memcpy(outString, m_register, length); - outString = m_stolenIV; - } - else - { - // steal from next to last block - xorbuf(m_register, inString, BlockSize()); - m_cipher->ProcessBlock(m_register); - inString += BlockSize(); - length -= BlockSize(); - memcpy(outString+BlockSize(), m_register, length); - } - - // output last full ciphertext block - xorbuf(m_register, inString, length); - m_cipher->ProcessBlock(m_register); - memcpy(outString, m_register, BlockSize()); -} - -void CBC_Decryption::ProcessData(byte *outString, const byte *inString, size_t length) -{ - if (!length) - return; - assert(length%BlockSize()==0); - - unsigned int blockSize = BlockSize(); - memcpy(m_temp, inString+length-blockSize, blockSize); // save copy now in case of in-place decryption - if (length > blockSize) - m_cipher->AdvancedProcessBlocks(inString+blockSize, inString, outString+blockSize, length-blockSize, BlockTransformation::BT_ReverseDirection|BlockTransformation::BT_AllowParallel); - m_cipher->ProcessAndXorBlock(inString, m_register, outString); - m_register.swap(m_temp); -} - -void CBC_CTS_Decryption::ProcessLastBlock(byte *outString, const byte *inString, size_t length) -{ - const byte *pn, *pn1; - bool stealIV = length <= BlockSize(); - - if (stealIV) - { - pn = inString; - pn1 = m_register; - } - else - { - pn = inString + BlockSize(); - pn1 = inString; - length -= BlockSize(); - } - - // decrypt last partial plaintext block - memcpy(m_temp, pn1, BlockSize()); - m_cipher->ProcessBlock(m_temp); - xorbuf(m_temp, pn, length); - - if (stealIV) - memcpy(outString, m_temp, length); - else - { - memcpy(outString+BlockSize(), m_temp, length); - // decrypt next to last plaintext block - memcpy(m_temp, pn, length); - m_cipher->ProcessBlock(m_temp); - xorbuf(outString, m_temp, m_register, BlockSize()); - } -} - -NAMESPACE_END - -#endif |