460 lines
18 KiB
C++
460 lines
18 KiB
C++
// modes.h - written and placed in the public domain by Wei Dai
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//! \file modes.h
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//! \brief Class file for modes of operation.
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#ifndef CRYPTOPP_MODES_H
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#define CRYPTOPP_MODES_H
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#include "cryptlib.h"
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#include "secblock.h"
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#include "misc.h"
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#include "strciphr.h"
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#include "argnames.h"
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#include "algparam.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! \class CipherModeDocumentation
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//! \brief Classes for operating block cipher modes of operation
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//! \details Each class derived from this one defines two types, Encryption and Decryption,
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//! both of which implement the SymmetricCipher interface.
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//! For each mode there are two classes, one of which is a template class,
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//! and the other one has a name that ends in "_ExternalCipher".
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//! The "external cipher" mode objects hold a reference to the underlying block cipher,
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//! instead of holding an instance of it. The reference must be passed in to the constructor.
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//! For the "cipher holder" classes, the CIPHER template parameter should be a class
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//! derived from BlockCipherDocumentation, for example DES or AES.
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//! \details See NIST SP 800-38A for definitions of these modes. See
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//! AuthenticatedSymmetricCipherDocumentation for authenticated encryption modes.
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struct CipherModeDocumentation : public SymmetricCipherDocumentation
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{
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CipherModeBase : public SymmetricCipher
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{
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public:
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size_t MinKeyLength() const {return m_cipher->MinKeyLength();}
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size_t MaxKeyLength() const {return m_cipher->MaxKeyLength();}
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size_t DefaultKeyLength() const {return m_cipher->DefaultKeyLength();}
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size_t GetValidKeyLength(size_t n) const {return m_cipher->GetValidKeyLength(n);}
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bool IsValidKeyLength(size_t n) const {return m_cipher->IsValidKeyLength(n);}
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unsigned int OptimalDataAlignment() const {return m_cipher->OptimalDataAlignment();}
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unsigned int IVSize() const {return BlockSize();}
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virtual IV_Requirement IVRequirement() const =0;
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void SetCipher(BlockCipher &cipher)
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{
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this->ThrowIfResynchronizable();
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this->m_cipher = &cipher;
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this->ResizeBuffers();
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}
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void SetCipherWithIV(BlockCipher &cipher, const byte *iv, int feedbackSize = 0)
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{
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this->ThrowIfInvalidIV(iv);
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this->m_cipher = &cipher;
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this->ResizeBuffers();
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this->SetFeedbackSize(feedbackSize);
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if (this->IsResynchronizable())
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this->Resynchronize(iv);
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}
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protected:
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CipherModeBase() : m_cipher(NULL) {}
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inline unsigned int BlockSize() const {assert(m_register.size() > 0); return (unsigned int)m_register.size();}
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virtual void SetFeedbackSize(unsigned int feedbackSize)
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{
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if (!(feedbackSize == 0 || feedbackSize == BlockSize()))
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throw InvalidArgument("CipherModeBase: feedback size cannot be specified for this cipher mode");
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}
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// Thanks to Zireael, http://github.com/weidai11/cryptopp/pull/46
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#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
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virtual void ResizeBuffers();
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#else
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virtual void ResizeBuffers()
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{
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m_register.New(m_cipher->BlockSize());
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}
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#endif
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BlockCipher *m_cipher;
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AlignedSecByteBlock m_register;
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};
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template <class POLICY_INTERFACE>
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class CRYPTOPP_NO_VTABLE ModePolicyCommonTemplate : public CipherModeBase, public POLICY_INTERFACE
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{
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unsigned int GetAlignment() const {return m_cipher->OptimalDataAlignment();}
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void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length);
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};
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template <class POLICY_INTERFACE>
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void ModePolicyCommonTemplate<POLICY_INTERFACE>::CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length)
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{
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m_cipher->SetKey(key, length, params);
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ResizeBuffers();
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int feedbackSize = params.GetIntValueWithDefault(Name::FeedbackSize(), 0);
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SetFeedbackSize(feedbackSize);
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}
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CFB_ModePolicy : public ModePolicyCommonTemplate<CFB_CipherAbstractPolicy>
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{
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public:
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IV_Requirement IVRequirement() const {return RANDOM_IV;}
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static const char * CRYPTOPP_API StaticAlgorithmName() {return "CFB";}
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protected:
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unsigned int GetBytesPerIteration() const {return m_feedbackSize;}
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byte * GetRegisterBegin() {return m_register + BlockSize() - m_feedbackSize;}
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bool CanIterate() const {return m_feedbackSize == BlockSize();}
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void Iterate(byte *output, const byte *input, CipherDir dir, size_t iterationCount);
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void TransformRegister();
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void CipherResynchronize(const byte *iv, size_t length);
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void SetFeedbackSize(unsigned int feedbackSize);
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void ResizeBuffers();
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SecByteBlock m_temp;
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unsigned int m_feedbackSize;
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};
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inline void CopyOrZero(void *dest, const void *src, size_t s)
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{
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if (src)
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memcpy_s(dest, s, src, s);
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else
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memset(dest, 0, s);
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}
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE OFB_ModePolicy : public ModePolicyCommonTemplate<AdditiveCipherAbstractPolicy>
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{
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public:
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bool CipherIsRandomAccess() const {return false;}
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IV_Requirement IVRequirement() const {return UNIQUE_IV;}
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static const char * CRYPTOPP_API StaticAlgorithmName() {return "OFB";}
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private:
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unsigned int GetBytesPerIteration() const {return BlockSize();}
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unsigned int GetIterationsToBuffer() const {return m_cipher->OptimalNumberOfParallelBlocks();}
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void WriteKeystream(byte *keystreamBuffer, size_t iterationCount);
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void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length);
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CTR_ModePolicy : public ModePolicyCommonTemplate<AdditiveCipherAbstractPolicy>
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{
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public:
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bool CipherIsRandomAccess() const {return true;}
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IV_Requirement IVRequirement() const {return RANDOM_IV;}
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static const char * CRYPTOPP_API StaticAlgorithmName() {return "CTR";}
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protected:
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virtual void IncrementCounterBy256();
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unsigned int GetAlignment() const {return m_cipher->OptimalDataAlignment();}
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unsigned int GetBytesPerIteration() const {return BlockSize();}
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unsigned int GetIterationsToBuffer() const {return m_cipher->OptimalNumberOfParallelBlocks();}
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void WriteKeystream(byte *buffer, size_t iterationCount)
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{OperateKeystream(WRITE_KEYSTREAM, buffer, NULL, iterationCount);}
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bool CanOperateKeystream() const {return true;}
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void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
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void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length);
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void SeekToIteration(lword iterationCount);
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AlignedSecByteBlock m_counterArray;
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BlockOrientedCipherModeBase : public CipherModeBase
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{
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public:
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void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms);
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unsigned int MandatoryBlockSize() const {return BlockSize();}
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bool IsRandomAccess() const {return false;}
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bool IsSelfInverting() const {return false;}
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bool IsForwardTransformation() const {return m_cipher->IsForwardTransformation();}
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void Resynchronize(const byte *iv, int length=-1) {memcpy_s(m_register, m_register.size(), iv, ThrowIfInvalidIVLength(length));}
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protected:
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bool RequireAlignedInput() const {return true;}
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// Thanks to Zireael, http://github.com/weidai11/cryptopp/pull/46
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#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
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void ResizeBuffers();
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#else
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void ResizeBuffers()
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{
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CipherModeBase::ResizeBuffers();
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m_buffer.New(BlockSize());
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}
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#endif
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SecByteBlock m_buffer;
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE ECB_OneWay : public BlockOrientedCipherModeBase
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{
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public:
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void SetKey(const byte *key, size_t length, const NameValuePairs ¶ms = g_nullNameValuePairs)
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{m_cipher->SetKey(key, length, params); BlockOrientedCipherModeBase::ResizeBuffers();}
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IV_Requirement IVRequirement() const {return NOT_RESYNCHRONIZABLE;}
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unsigned int OptimalBlockSize() const {return BlockSize() * m_cipher->OptimalNumberOfParallelBlocks();}
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void ProcessData(byte *outString, const byte *inString, size_t length);
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static const char * CRYPTOPP_API StaticAlgorithmName() {return "ECB";}
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_ModeBase : public BlockOrientedCipherModeBase
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{
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public:
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IV_Requirement IVRequirement() const {return UNPREDICTABLE_RANDOM_IV;}
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bool RequireAlignedInput() const {return false;}
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unsigned int MinLastBlockSize() const {return 0;}
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static const char * CRYPTOPP_API StaticAlgorithmName() {return "CBC";}
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_Encryption : public CBC_ModeBase
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{
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public:
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void ProcessData(byte *outString, const byte *inString, size_t length);
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_CTS_Encryption : public CBC_Encryption
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{
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public:
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void SetStolenIV(byte *iv) {m_stolenIV = iv;}
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unsigned int MinLastBlockSize() const {return BlockSize()+1;}
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void ProcessLastBlock(byte *outString, const byte *inString, size_t length);
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static const char * CRYPTOPP_API StaticAlgorithmName() {return "CBC/CTS";}
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protected:
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void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms)
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{
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CBC_Encryption::UncheckedSetKey(key, length, params);
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m_stolenIV = params.GetValueWithDefault(Name::StolenIV(), (byte *)NULL);
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}
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byte *m_stolenIV;
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_Decryption : public CBC_ModeBase
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{
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public:
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void ProcessData(byte *outString, const byte *inString, size_t length);
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protected:
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// Thanks to Zireael, http://github.com/weidai11/cryptopp/pull/46
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#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
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void ResizeBuffers();
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#else
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void ResizeBuffers()
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{
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BlockOrientedCipherModeBase::ResizeBuffers();
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m_temp.New(BlockSize());
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}
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#endif
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AlignedSecByteBlock m_temp;
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};
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_CTS_Decryption : public CBC_Decryption
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{
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public:
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unsigned int MinLastBlockSize() const {return BlockSize()+1;}
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void ProcessLastBlock(byte *outString, const byte *inString, size_t length);
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};
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//! _
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template <class CIPHER, class BASE>
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class CipherModeFinalTemplate_CipherHolder : protected ObjectHolder<CIPHER>, public AlgorithmImpl<BASE, CipherModeFinalTemplate_CipherHolder<CIPHER, BASE> >
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{
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public:
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CipherModeFinalTemplate_CipherHolder()
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{
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this->m_cipher = &this->m_object;
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this->ResizeBuffers();
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}
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CipherModeFinalTemplate_CipherHolder(const byte *key, size_t length)
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{
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this->m_cipher = &this->m_object;
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this->SetKey(key, length);
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}
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CipherModeFinalTemplate_CipherHolder(const byte *key, size_t length, const byte *iv)
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{
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this->m_cipher = &this->m_object;
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this->SetKey(key, length, MakeParameters(Name::IV(), ConstByteArrayParameter(iv, this->m_cipher->BlockSize())));
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}
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CipherModeFinalTemplate_CipherHolder(const byte *key, size_t length, const byte *iv, int feedbackSize)
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{
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this->m_cipher = &this->m_object;
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this->SetKey(key, length, MakeParameters(Name::IV(), ConstByteArrayParameter(iv, this->m_cipher->BlockSize()))(Name::FeedbackSize(), feedbackSize));
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}
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static std::string CRYPTOPP_API StaticAlgorithmName()
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{return CIPHER::StaticAlgorithmName() + "/" + BASE::StaticAlgorithmName();}
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};
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//! \class CipherModeFinalTemplate_ExternalCipher
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//! \tparam BASE CipherModeFinalTemplate_CipherHolder class
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//! \brief OFB block cipher mode of operation.
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template <class BASE>
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class CipherModeFinalTemplate_ExternalCipher : public BASE
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{
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public:
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CipherModeFinalTemplate_ExternalCipher() {}
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CipherModeFinalTemplate_ExternalCipher(BlockCipher &cipher)
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{this->SetCipher(cipher);}
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CipherModeFinalTemplate_ExternalCipher(BlockCipher &cipher, const byte *iv, int feedbackSize = 0)
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{this->SetCipherWithIV(cipher, iv, feedbackSize);}
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std::string AlgorithmName() const
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{return (this->m_cipher ? this->m_cipher->AlgorithmName() + "/" : std::string("")) + BASE::StaticAlgorithmName();}
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};
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CRYPTOPP_DLL_TEMPLATE_CLASS CFB_CipherTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
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CRYPTOPP_DLL_TEMPLATE_CLASS CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
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CRYPTOPP_DLL_TEMPLATE_CLASS CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
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//! \class CFB_Mode
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//! \brief CFB block cipher mode of operation.
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template <class CIPHER>
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struct CFB_Mode : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Encryption;
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Decryption;
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};
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//! \class CFB_Mode_ExternalCipher
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//! \brief CFB mode, external cipher.
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struct CFB_Mode_ExternalCipher : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Encryption;
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typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Decryption;
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};
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//! \class CFB_FIPS_Mode
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//! \brief CFB block cipher mode of operation providing FIPS validated cryptography.
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//! \details Requires full block plaintext according to FIPS 800-38A
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template <class CIPHER>
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struct CFB_FIPS_Mode : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Encryption;
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Decryption;
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};
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//! \class CFB_FIPS_Mode_ExternalCipher
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//! \brief CFB mode, external cipher, providing FIPS validated cryptography.
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//! \details Requires full block plaintext according to FIPS 800-38A
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struct CFB_FIPS_Mode_ExternalCipher : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Encryption;
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typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Decryption;
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};
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CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> >;
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//! \class OFB_Mode
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//! \brief OFB block cipher mode of operation.
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template <class CIPHER>
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struct OFB_Mode : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> > > > Encryption;
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typedef Encryption Decryption;
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};
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//! \class OFB_Mode_ExternalCipher
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//! \brief OFB mode, external cipher.
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struct OFB_Mode_ExternalCipher : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> > > > Encryption;
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typedef Encryption Decryption;
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};
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CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> >;
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CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > >;
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//! \class CTR_Mode
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//! \brief CTR block cipher mode of operation.
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template <class CIPHER>
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struct CTR_Mode : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > > Encryption;
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typedef Encryption Decryption;
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};
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//! \class CTR_Mode_ExternalCipher
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//! \brief CTR mode, external cipher.
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struct CTR_Mode_ExternalCipher : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > > Encryption;
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typedef Encryption Decryption;
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};
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//! \class ECB_Mode
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//! \brief ECB block cipher mode of operation.
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template <class CIPHER>
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struct ECB_Mode : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ECB_OneWay> Encryption;
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, ECB_OneWay> Decryption;
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};
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CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<ECB_OneWay>;
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//! \class ECB_Mode_ExternalCipher
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//! \brief ECB mode, external cipher.
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struct ECB_Mode_ExternalCipher : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_ExternalCipher<ECB_OneWay> Encryption;
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typedef Encryption Decryption;
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};
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//! CBC mode
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template <class CIPHER>
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struct CBC_Mode : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, CBC_Encryption> Encryption;
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, CBC_Decryption> Decryption;
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};
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CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_Encryption>;
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CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_Decryption>;
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//! CBC mode, external cipher
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struct CBC_Mode_ExternalCipher : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_ExternalCipher<CBC_Encryption> Encryption;
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typedef CipherModeFinalTemplate_ExternalCipher<CBC_Decryption> Decryption;
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};
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//! CBC mode with ciphertext stealing
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template <class CIPHER>
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struct CBC_CTS_Mode : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, CBC_CTS_Encryption> Encryption;
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typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, CBC_CTS_Decryption> Decryption;
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};
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CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Encryption>;
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CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Decryption>;
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//! \class CBC_CTS_Mode_ExternalCipher
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//! \brief CBC mode with ciphertext stealing, external cipher
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struct CBC_CTS_Mode_ExternalCipher : public CipherModeDocumentation
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{
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typedef CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Encryption> Encryption;
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typedef CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Decryption> Decryption;
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};
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#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY
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typedef CFB_Mode_ExternalCipher::Encryption CFBEncryption;
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typedef CFB_Mode_ExternalCipher::Decryption CFBDecryption;
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typedef OFB_Mode_ExternalCipher::Encryption OFB;
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typedef CTR_Mode_ExternalCipher::Encryption CounterMode;
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#endif
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NAMESPACE_END
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#endif
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