445 lines
20 KiB
C++
445 lines
20 KiB
C++
// seckey.h - originally written and placed in the public domain by Wei Dai
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/// \file seckey.h
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/// \brief Classes and functions for implementing secret key algorithms.
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#ifndef CRYPTOPP_SECKEY_H
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#define CRYPTOPP_SECKEY_H
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#include "config.h"
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#include "cryptlib.h"
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#include "misc.h"
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#include "simple.h"
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#include "stdcpp.h"
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#if CRYPTOPP_MSC_VERSION
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# pragma warning(push)
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# pragma warning(disable: 4189 4296)
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#endif
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// Issue 340
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#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wconversion"
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# pragma GCC diagnostic ignored "-Wsign-conversion"
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief Inverts the cipher's direction
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/// \param dir the cipher's direction
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/// \returns DECRYPTION if \ref CipherDir "dir" is ENCRYPTION, DECRYPTION otherwise
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inline CipherDir ReverseCipherDir(CipherDir dir)
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{
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return (dir == ENCRYPTION) ? DECRYPTION : ENCRYPTION;
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}
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/// \brief Inherited by algorithms with fixed block size
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/// \tparam N the blocksize of the algorithm
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template <unsigned int N>
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class FixedBlockSize
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{
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public:
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/// \brief The block size of the algorithm provided as a constant.
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CRYPTOPP_CONSTANT(BLOCKSIZE = N)
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};
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// ************** rounds ***************
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/// \brief Inherited by algorithms with fixed number of rounds
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/// \tparam R the number of rounds used by the algorithm
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template <unsigned int R>
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class FixedRounds
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{
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public:
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/// \brief The number of rounds for the algorithm provided as a constant.
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CRYPTOPP_CONSTANT(ROUNDS = R)
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};
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/// \brief Inherited by algorithms with variable number of rounds
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/// \tparam D Default number of rounds
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/// \tparam N Minimum number of rounds
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/// \tparam M Maximum number of rounds
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template <unsigned int D, unsigned int N=1, unsigned int M=INT_MAX> // use INT_MAX here because enums are treated as signed ints
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class VariableRounds
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{
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public:
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/// \brief The default number of rounds for the algorithm provided as a constant.
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CRYPTOPP_CONSTANT(DEFAULT_ROUNDS = D)
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/// \brief The minimum number of rounds for the algorithm provided as a constant.
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CRYPTOPP_CONSTANT(MIN_ROUNDS = N)
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/// \brief The maximum number of rounds for the algorithm provided as a constant.
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CRYPTOPP_CONSTANT(MAX_ROUNDS = M)
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/// \brief The default number of rounds for the algorithm based on key length
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/// provided by a static function.
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/// \param keylength the size of the key, in bytes
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/// \details keylength is unused in the default implementation.
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CRYPTOPP_STATIC_CONSTEXPR unsigned int StaticGetDefaultRounds(size_t keylength)
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{
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return CRYPTOPP_UNUSED(keylength), static_cast<unsigned int>(DEFAULT_ROUNDS);
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}
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protected:
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/// \brief Validates the number of rounds for an algorithm.
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/// \param rounds the candidate number of rounds
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/// \param alg an Algorithm object used if the number of rounds are invalid
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/// \throws InvalidRounds if the number of rounds are invalid
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/// \details ThrowIfInvalidRounds() validates the number of rounds and throws if invalid.
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inline void ThrowIfInvalidRounds(int rounds, const Algorithm *alg)
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{
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if (M == INT_MAX) // Coverity and result_independent_of_operands
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{
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if (rounds < MIN_ROUNDS)
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throw InvalidRounds(alg ? alg->AlgorithmName() : std::string("VariableRounds"), rounds);
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}
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else
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{
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if (rounds < MIN_ROUNDS || rounds > MAX_ROUNDS)
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throw InvalidRounds(alg ? alg->AlgorithmName() : std::string("VariableRounds"), rounds);
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}
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}
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/// \brief Validates the number of rounds for an algorithm
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/// \param param the candidate number of rounds
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/// \param alg an Algorithm object used if the number of rounds are invalid
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/// \returns the number of rounds for the algorithm
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/// \throws InvalidRounds if the number of rounds are invalid
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/// \details GetRoundsAndThrowIfInvalid() validates the number of rounds and throws if invalid.
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inline unsigned int GetRoundsAndThrowIfInvalid(const NameValuePairs ¶m, const Algorithm *alg)
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{
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int rounds = param.GetIntValueWithDefault("Rounds", DEFAULT_ROUNDS);
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ThrowIfInvalidRounds(rounds, alg);
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return static_cast<unsigned int>(rounds);
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}
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};
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// ************** key length ***************
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/// \brief Inherited by keyed algorithms with fixed key length
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/// \tparam N Default key length, in bytes
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/// \tparam IV_REQ the \ref SimpleKeyingInterface::IV_Requirement "IV requirements"
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/// \tparam IV_L default IV length, in bytes
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/// \sa SimpleKeyingInterface
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template <unsigned int N, unsigned int IV_REQ = SimpleKeyingInterface::NOT_RESYNCHRONIZABLE, unsigned int IV_L = 0>
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class FixedKeyLength
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{
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public:
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/// \brief The default key length used by the algorithm provided as a constant
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/// \details KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(KEYLENGTH=N)
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/// \brief The minimum key length used by the algorithm provided as a constant
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/// \details MIN_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(MIN_KEYLENGTH=N)
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/// \brief The maximum key length used by the algorithm provided as a constant
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/// \details MAX_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(MAX_KEYLENGTH=N)
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/// \brief The default key length used by the algorithm provided as a constant
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/// \details DEFAULT_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(DEFAULT_KEYLENGTH=N)
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/// \brief The default IV requirements for the algorithm provided as a constant
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/// \details The default value is NOT_RESYNCHRONIZABLE. See IV_Requirement
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/// in cryptlib.h for allowed values.
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CRYPTOPP_CONSTANT(IV_REQUIREMENT = IV_REQ)
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/// \brief The default IV length used by the algorithm provided as a constant
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/// \details IV_LENGTH is provided in bytes, not bits. The default implementation uses 0.
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CRYPTOPP_CONSTANT(IV_LENGTH = IV_L)
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/// \brief The default key length for the algorithm provided by a static function.
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/// \param keylength the size of the key, in bytes
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/// \details The default implementation returns KEYLENGTH. keylength is unused
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/// in the default implementation.
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CRYPTOPP_STATIC_CONSTEXPR size_t CRYPTOPP_API StaticGetValidKeyLength(size_t keylength)
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{
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return CRYPTOPP_UNUSED(keylength), static_cast<size_t>(KEYLENGTH);
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}
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};
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/// \brief Inherited by keyed algorithms with variable key length
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/// \tparam D Default key length, in bytes
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/// \tparam N Minimum key length, in bytes
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/// \tparam M Maximum key length, in bytes
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/// \tparam Q Default key length multiple, in bytes. The default multiple is 1.
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/// \tparam IV_REQ the \ref SimpleKeyingInterface::IV_Requirement "IV requirements"
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/// \tparam IV_L default IV length, in bytes. The default length is 0.
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/// \sa SimpleKeyingInterface
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template <unsigned int D, unsigned int N, unsigned int M, unsigned int Q = 1, unsigned int IV_REQ = SimpleKeyingInterface::NOT_RESYNCHRONIZABLE, unsigned int IV_L = 0>
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class VariableKeyLength
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{
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// Make these private to avoid Doxygen documenting them in all derived classes
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CRYPTOPP_COMPILE_ASSERT(Q > 0);
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CRYPTOPP_COMPILE_ASSERT(N % Q == 0);
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CRYPTOPP_COMPILE_ASSERT(M % Q == 0);
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CRYPTOPP_COMPILE_ASSERT(N < M);
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CRYPTOPP_COMPILE_ASSERT(D >= N);
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CRYPTOPP_COMPILE_ASSERT(M >= D);
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public:
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/// \brief The minimum key length used by the algorithm provided as a constant
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/// \details MIN_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(MIN_KEYLENGTH=N)
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/// \brief The maximum key length used by the algorithm provided as a constant
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/// \details MAX_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(MAX_KEYLENGTH=M)
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/// \brief The default key length used by the algorithm provided as a constant
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/// \details DEFAULT_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(DEFAULT_KEYLENGTH=D)
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/// \brief The key length multiple used by the algorithm provided as a constant
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/// \details MAX_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(KEYLENGTH_MULTIPLE=Q)
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/// \brief The default IV requirements for the algorithm provided as a constant
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/// \details The default value is NOT_RESYNCHRONIZABLE. See IV_Requirement
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/// in cryptlib.h for allowed values.
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CRYPTOPP_CONSTANT(IV_REQUIREMENT=IV_REQ)
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/// \brief The default initialization vector length for the algorithm provided as a constant
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/// \details IV_LENGTH is provided in bytes, not bits. The default implementation uses 0.
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CRYPTOPP_CONSTANT(IV_LENGTH=IV_L)
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/// \brief Provides a valid key length for the algorithm provided by a static function.
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/// \param keylength the size of the key, in bytes
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/// \details If keylength is less than MIN_KEYLENGTH, then the function returns
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/// MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH, then the function
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/// returns MAX_KEYLENGTH. If keylength is a multiple of KEYLENGTH_MULTIPLE,
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/// then keylength is returned. Otherwise, the function returns keylength rounded
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/// \a down to the next smaller multiple of KEYLENGTH_MULTIPLE.
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/// \details keylength is provided in bytes, not bits.
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CRYPTOPP_STATIC_CONSTEXPR size_t CRYPTOPP_API StaticGetValidKeyLength(size_t keylength)
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{
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return (keylength <= N) ? N :
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(keylength >= M) ? M :
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(keylength+Q-1) - (keylength+Q-1)%Q;
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}
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};
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/// \brief Provides key lengths based on another class's key length
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/// \tparam T another FixedKeyLength or VariableKeyLength class
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/// \tparam IV_REQ the \ref SimpleKeyingInterface::IV_Requirement "IV requirements"
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/// \tparam IV_L default IV length, in bytes
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/// \sa SimpleKeyingInterface
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template <class T, unsigned int IV_REQ = SimpleKeyingInterface::NOT_RESYNCHRONIZABLE, unsigned int IV_L = 0>
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class SameKeyLengthAs
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{
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public:
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/// \brief The minimum key length used by the algorithm provided as a constant
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/// \details MIN_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(MIN_KEYLENGTH=T::MIN_KEYLENGTH)
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/// \brief The maximum key length used by the algorithm provided as a constant
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/// \details MIN_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(MAX_KEYLENGTH=T::MAX_KEYLENGTH)
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/// \brief The default key length used by the algorithm provided as a constant
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/// \details MIN_KEYLENGTH is provided in bytes, not bits
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CRYPTOPP_CONSTANT(DEFAULT_KEYLENGTH=T::DEFAULT_KEYLENGTH)
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/// \brief The default IV requirements for the algorithm provided as a constant
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/// \details The default value is NOT_RESYNCHRONIZABLE. See IV_Requirement
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/// in cryptlib.h for allowed values.
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CRYPTOPP_CONSTANT(IV_REQUIREMENT=IV_REQ)
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/// \brief The default initialization vector length for the algorithm provided as a constant
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/// \details IV_LENGTH is provided in bytes, not bits. The default implementation uses 0.
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CRYPTOPP_CONSTANT(IV_LENGTH=IV_L)
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/// \brief Provides a valid key length for the algorithm provided by a static function.
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/// \param keylength the size of the key, in bytes
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/// \details If keylength is less than MIN_KEYLENGTH, then the function returns
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/// MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH, then the function
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/// returns MAX_KEYLENGTH. If keylength is a multiple of KEYLENGTH_MULTIPLE,
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/// then keylength is returned. Otherwise, the function returns keylength rounded
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/// \a down to the next smaller multiple of KEYLENGTH_MULTIPLE.
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/// \details keylength is provided in bytes, not bits.
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CRYPTOPP_STATIC_CONSTEXPR size_t CRYPTOPP_API StaticGetValidKeyLength(size_t keylength)
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{return T::StaticGetValidKeyLength(keylength);}
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};
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// ************** implementation helper for SimpleKeyingInterface ***************
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/// \brief Provides a base implementation of SimpleKeyingInterface
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/// \tparam BASE a SimpleKeyingInterface derived class
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/// \tparam INFO a SimpleKeyingInterface derived class
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/// \details SimpleKeyingInterfaceImpl() provides a default implementation for ciphers providing a keying interface.
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/// Functions are virtual and not eligible for C++11 <tt>constexpr</tt>-ness.
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/// \sa Algorithm(), SimpleKeyingInterface()
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template <class BASE, class INFO = BASE>
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class CRYPTOPP_NO_VTABLE SimpleKeyingInterfaceImpl : public BASE
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{
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public:
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/// \brief The minimum key length used by the algorithm
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/// \returns minimum key length used by the algorithm, in bytes
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size_t MinKeyLength() const
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{return INFO::MIN_KEYLENGTH;}
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/// \brief The maximum key length used by the algorithm
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/// \returns maximum key length used by the algorithm, in bytes
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size_t MaxKeyLength() const
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{return static_cast<size_t>(INFO::MAX_KEYLENGTH);}
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/// \brief The default key length used by the algorithm
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/// \returns default key length used by the algorithm, in bytes
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size_t DefaultKeyLength() const
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{return INFO::DEFAULT_KEYLENGTH;}
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/// \brief Provides a valid key length for the algorithm
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/// \param keylength the size of the key, in bytes
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/// \returns the valid key length, in bytes
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/// \details keylength is provided in bytes, not bits. If keylength is less than MIN_KEYLENGTH,
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/// then the function returns MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH,
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/// then the function returns MAX_KEYLENGTH. if If keylength is a multiple of KEYLENGTH_MULTIPLE,
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/// then keylength is returned. Otherwise, the function returns a \a lower multiple of
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/// KEYLENGTH_MULTIPLE.
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size_t GetValidKeyLength(size_t keylength) const {return INFO::StaticGetValidKeyLength(keylength);}
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/// \brief The default IV requirements for the algorithm
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/// \details The default value is NOT_RESYNCHRONIZABLE. See IV_Requirement
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/// in cryptlib.h for allowed values.
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SimpleKeyingInterface::IV_Requirement IVRequirement() const
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{return static_cast<SimpleKeyingInterface::IV_Requirement>(INFO::IV_REQUIREMENT);}
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/// \brief The initialization vector length for the algorithm
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/// \details IVSize is provided in bytes, not bits. The default implementation uses
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/// IV_LENGTH, which is 0.
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unsigned int IVSize() const
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{return INFO::IV_LENGTH;}
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};
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/// \brief Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers
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/// \tparam INFO a SimpleKeyingInterface derived class
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/// \tparam BASE a SimpleKeyingInterface derived class
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/// \details BlockCipherImpl() provides a default implementation for block ciphers using AlgorithmImpl()
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/// and SimpleKeyingInterfaceImpl(). Functions are virtual and not eligible for C++11 <tt>constexpr</tt>-ness.
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/// \sa Algorithm(), SimpleKeyingInterface(), AlgorithmImpl(), SimpleKeyingInterfaceImpl()
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template <class INFO, class BASE = BlockCipher>
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class CRYPTOPP_NO_VTABLE BlockCipherImpl : public AlgorithmImpl<SimpleKeyingInterfaceImpl<TwoBases<BASE, INFO> > >
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{
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public:
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/// Provides the block size of the algorithm
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/// \returns the block size of the algorithm, in bytes
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unsigned int BlockSize() const {return this->BLOCKSIZE;}
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};
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/// \brief Provides class member functions to key a block cipher
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/// \tparam DIR a CipherDir
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/// \tparam BASE a BlockCipherImpl derived class
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template <CipherDir DIR, class BASE>
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class BlockCipherFinal : public ClonableImpl<BlockCipherFinal<DIR, BASE>, BASE>
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{
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public:
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/// \brief Construct a default BlockCipherFinal
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/// \details The cipher is not keyed.
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BlockCipherFinal() {}
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/// \brief Construct a BlockCipherFinal
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/// \param key a byte array used to key the cipher
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/// \details key must be at least DEFAULT_KEYLENGTH in length. Internally, the function calls
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/// SimpleKeyingInterface::SetKey.
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BlockCipherFinal(const byte *key)
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{this->SetKey(key, this->DEFAULT_KEYLENGTH);}
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/// \brief Construct a BlockCipherFinal
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/// \param key a byte array used to key the cipher
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/// \param length the length of the byte array
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/// \details key must be at least DEFAULT_KEYLENGTH in length. Internally, the function calls
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/// SimpleKeyingInterface::SetKey.
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BlockCipherFinal(const byte *key, size_t length)
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{this->SetKey(key, length);}
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/// \brief Construct a BlockCipherFinal
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/// \param key a byte array used to key the cipher
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/// \param length the length of the byte array
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/// \param rounds the number of rounds
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/// \details key must be at least DEFAULT_KEYLENGTH in length. Internally, the function calls
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/// SimpleKeyingInterface::SetKeyWithRounds.
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BlockCipherFinal(const byte *key, size_t length, unsigned int rounds)
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{this->SetKeyWithRounds(key, length, rounds);}
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/// \brief Provides the direction of the cipher
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/// \returns true if DIR is ENCRYPTION, false otherwise
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/// \sa GetCipherDirection(), IsPermutation()
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bool IsForwardTransformation() const {return DIR == ENCRYPTION;}
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};
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/// \brief Provides a base implementation of Algorithm and SimpleKeyingInterface for message authentication codes
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/// \tparam INFO a SimpleKeyingInterface derived class
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/// \tparam BASE a SimpleKeyingInterface derived class
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/// \details MessageAuthenticationCodeImpl() provides a default implementation for message authentication codes
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/// using AlgorithmImpl() and SimpleKeyingInterfaceImpl(). Functions are virtual and not subject to C++11
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/// <tt>constexpr</tt>.
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/// \sa Algorithm(), SimpleKeyingInterface(), AlgorithmImpl(), SimpleKeyingInterfaceImpl()
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template <class BASE, class INFO = BASE>
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class MessageAuthenticationCodeImpl : public AlgorithmImpl<SimpleKeyingInterfaceImpl<BASE, INFO>, INFO>
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{
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};
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/// \brief Provides class member functions to key a message authentication code
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/// \tparam BASE a BlockCipherImpl derived class
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/// \details A default implementation for MessageAuthenticationCode
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template <class BASE>
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class MessageAuthenticationCodeFinal : public ClonableImpl<MessageAuthenticationCodeFinal<BASE>, MessageAuthenticationCodeImpl<BASE> >
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{
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public:
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/// \brief Construct a default MessageAuthenticationCodeFinal
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/// \details The message authentication code is not keyed.
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MessageAuthenticationCodeFinal() {}
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/// \brief Construct a BlockCipherFinal
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/// \param key a byte array used to key the algorithm
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/// \details key must be at least DEFAULT_KEYLENGTH in length. Internally, the function calls
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/// SimpleKeyingInterface::SetKey.
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MessageAuthenticationCodeFinal(const byte *key)
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{this->SetKey(key, this->DEFAULT_KEYLENGTH);}
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/// \brief Construct a BlockCipherFinal
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/// \param key a byte array used to key the algorithm
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/// \param length the length of the byte array
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/// \details key must be at least DEFAULT_KEYLENGTH in length. Internally, the function calls
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/// SimpleKeyingInterface::SetKey.
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MessageAuthenticationCodeFinal(const byte *key, size_t length)
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{this->SetKey(key, length);}
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};
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// ************** documentation ***************
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/// \brief Provides Encryption and Decryption typedefs used by derived classes to
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/// implement a block cipher
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/// \details These objects usually should not be used directly. See CipherModeDocumentation
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/// instead. Each class derived from this one defines two types, Encryption and Decryption,
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/// both of which implement the BlockCipher interface.
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struct BlockCipherDocumentation
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{
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/// implements the BlockCipher interface
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typedef BlockCipher Encryption;
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/// implements the BlockCipher interface
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typedef BlockCipher Decryption;
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};
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/// \brief Provides Encryption and Decryption typedefs used by derived classes to
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/// implement a symmetric cipher
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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. Two types of classes derive
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/// from this class: stream ciphers and block cipher modes. Stream ciphers can be used
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/// alone, cipher mode classes need to be used with a block cipher. See CipherModeDocumentation
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/// for more for information about using cipher modes and block ciphers.
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struct SymmetricCipherDocumentation
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{
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/// implements the SymmetricCipher interface
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typedef SymmetricCipher Encryption;
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/// implements the SymmetricCipher interface
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typedef SymmetricCipher Decryption;
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};
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/// \brief Provides Encryption and Decryption typedefs used by derived classes to
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/// implement an authenticated encryption cipher
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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 AuthenticatedSymmetricCipher interface.
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struct AuthenticatedSymmetricCipherDocumentation
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{
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/// implements the AuthenticatedSymmetricCipher interface
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typedef AuthenticatedSymmetricCipher Encryption;
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/// implements the AuthenticatedSymmetricCipher interface
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typedef AuthenticatedSymmetricCipher Decryption;
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};
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|
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NAMESPACE_END
|
|
|
|
#if CRYPTOPP_MSC_VERSION
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|
# pragma warning(pop)
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|
#endif
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|
|
|
// Issue 340
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|
#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
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|
# pragma GCC diagnostic pop
|
|
#endif
|
|
|
|
#endif
|