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authormadmaxoft@gmail.com <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>2012-08-30 23:06:13 +0200
committermadmaxoft@gmail.com <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>2012-08-30 23:06:13 +0200
commit539364846a89987ac2679988653f50332cb91d26 (patch)
treef1695473c1f493a19c5fbdb70f7f1faccf99d7f3 /CryptoPP/modes.cpp
parentUpdated to V6 - "Stop" and "Progress report" functionality (diff)
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Diffstat (limited to 'CryptoPP/modes.cpp')
-rw-r--r--CryptoPP/modes.cpp245
1 files changed, 245 insertions, 0 deletions
diff --git a/CryptoPP/modes.cpp b/CryptoPP/modes.cpp
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+++ b/CryptoPP/modes.cpp
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+// 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 &params)
+{
+ 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