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GCM_Base Class Referenceabstract

GCM block cipher base implementation. More...

#include <gcm.h>

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Classes

class  GCTR
 

Public Member Functions

std::string AlgorithmName () const
 Provides the name of this algorithm. More...
 
size_t MinKeyLength () const
 Returns smallest valid key length. More...
 
size_t MaxKeyLength () const
 Returns largest valid key length. More...
 
size_t DefaultKeyLength () const
 Returns default key length. More...
 
size_t GetValidKeyLength (size_t n) const
 Returns a valid key length for the algorithm. More...
 
bool IsValidKeyLength (size_t n) const
 Returns whether keylength is a valid key length. More...
 
unsigned int OptimalDataAlignment () const
 Provides input and output data alignment for optimal performance. More...
 
IV_Requirement IVRequirement () const
 Minimal requirement for secure IVs. More...
 
unsigned int IVSize () const
 Returns length of the IV accepted by this object. More...
 
unsigned int MinIVLength () const
 Provides the minimum size of an IV. More...
 
unsigned int MaxIVLength () const
 Provides the maximum size of an IV. More...
 
unsigned int DigestSize () const
 Provides the digest size of the hash. More...
 
lword MaxHeaderLength () const
 Provides the maximum length of AAD that can be input. More...
 
lword MaxMessageLength () const
 Provides the maximum length of encrypted data. More...
 
- Public Member Functions inherited from AuthenticatedSymmetricCipherBase
 AuthenticatedSymmetricCipherBase ()
 
bool IsRandomAccess () const
 Determines whether the cipher supports random access. More...
 
bool IsSelfInverting () const
 Determines whether the cipher is self-inverting. More...
 
void UncheckedSetKey (const byte *key, unsigned int length, const CryptoPP::NameValuePairs &params)
 Sets the key for this object without performing parameter validation. More...
 
void SetKey (const byte *userKey, size_t keylength, const NameValuePairs &params)
 Sets or reset the key of this object. More...
 
void Restart ()
 Restart the hash. More...
 
void Resynchronize (const byte *iv, int length=-1)
 Resynchronize with an IV. More...
 
void Update (const byte *input, size_t length)
 Updates a hash with additional input. More...
 
void ProcessData (byte *outString, const byte *inString, size_t length)
 Encrypt or decrypt an array of bytes. More...
 
void TruncatedFinal (byte *mac, size_t macSize)
 Computes the hash of the current message. More...
 
- Public Member Functions inherited from AuthenticatedSymmetricCipher
virtual ~AuthenticatedSymmetricCipher ()
 
virtual lword MaxFooterLength () const
 Provides the the maximum length of AAD. More...
 
virtual bool NeedsPrespecifiedDataLengths () const
 Determines if data lengths must be specified prior to inputting data. More...
 
void SpecifyDataLengths (lword headerLength, lword messageLength, lword footerLength=0)
 Prespecifies the data lengths. More...
 
virtual void EncryptAndAuthenticate (byte *ciphertext, byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *header, size_t headerLength, const byte *message, size_t messageLength)
 Encrypts and calculates a MAC in one call. More...
 
virtual bool DecryptAndVerify (byte *message, const byte *mac, size_t macLength, const byte *iv, int ivLength, const byte *header, size_t headerLength, const byte *ciphertext, size_t ciphertextLength)
 Decrypts and verifies a MAC in one call. More...
 
- Public Member Functions inherited from SimpleKeyingInterface
virtual ~SimpleKeyingInterface ()
 
void SetKeyWithRounds (const byte *key, size_t length, int rounds)
 Sets or reset the key of this object. More...
 
void SetKeyWithIV (const byte *key, size_t length, const byte *iv, size_t ivLength)
 Sets or reset the key of this object. More...
 
void SetKeyWithIV (const byte *key, size_t length, const byte *iv)
 Sets or reset the key of this object. More...
 
bool IsResynchronizable () const
 Determines if the object can be resynchronized. More...
 
bool CanUseRandomIVs () const
 Determines if the object can use random IVs. More...
 
bool CanUsePredictableIVs () const
 Determines if the object can use random but possibly predictable IVs. More...
 
bool CanUseStructuredIVs () const
 Determines if the object can use structured IVs. More...
 
unsigned int DefaultIVLength () const
 Provides the default size of an IV. More...
 
virtual void GetNextIV (RandomNumberGenerator &rng, byte *iv)
 Retrieves a secure IV for the next message. More...
 
- Public Member Functions inherited from HashTransformation
virtual ~HashTransformation ()
 
HashTransformationRef ()
 Provides a reference to this object. More...
 
virtual byteCreateUpdateSpace (size_t &size)
 Request space which can be written into by the caller. More...
 
virtual void Final (byte *digest)
 Computes the hash of the current message. More...
 
unsigned int TagSize () const
 Provides the tag size of the hash. More...
 
virtual unsigned int BlockSize () const
 Provides the block size of the compression function. More...
 
virtual unsigned int OptimalBlockSize () const
 Provides the input block size most efficient for this hash. More...
 
virtual void CalculateDigest (byte *digest, const byte *input, size_t length)
 Updates the hash with additional input and computes the hash of the current message. More...
 
virtual bool Verify (const byte *digest)
 Verifies the hash of the current message. More...
 
virtual bool VerifyDigest (const byte *digest, const byte *input, size_t length)
 Updates the hash with additional input and verifies the hash of the current message. More...
 
virtual void CalculateTruncatedDigest (byte *digest, size_t digestSize, const byte *input, size_t length)
 Updates the hash with additional input and computes the hash of the current message. More...
 
virtual bool TruncatedVerify (const byte *digest, size_t digestLength)
 Verifies the hash of the current message. More...
 
virtual bool VerifyTruncatedDigest (const byte *digest, size_t digestLength, const byte *input, size_t length)
 Updates the hash with additional input and verifies the hash of the current message. More...
 
- Public Member Functions inherited from Algorithm
virtual ~Algorithm ()
 
 Algorithm (bool checkSelfTestStatus=true)
 Interface for all crypto algorithms. More...
 
- Public Member Functions inherited from Clonable
virtual ~Clonable ()
 
virtual ClonableClone () const
 Copies this object. More...
 
- Public Member Functions inherited from StreamTransformation
virtual ~StreamTransformation ()
 
StreamTransformationRef ()
 Provides a reference to this object. More...
 
virtual unsigned int MandatoryBlockSize () const
 Provides the mandatory block size of the cipher. More...
 
virtual unsigned int OptimalBlockSize () const
 Provides the input block size most efficient for this cipher. More...
 
virtual unsigned int GetOptimalBlockSizeUsed () const
 Provides the number of bytes used in the current block when processing at optimal block size. More...
 
virtual void ProcessLastBlock (byte *outString, const byte *inString, size_t length)
 Encrypt or decrypt the last block of data. More...
 
virtual unsigned int MinLastBlockSize () const
 Provides the size of the last block. More...
 
void ProcessString (byte *inoutString, size_t length)
 Encrypt or decrypt a string of bytes. More...
 
void ProcessString (byte *outString, const byte *inString, size_t length)
 Encrypt or decrypt a string of bytes. More...
 
byte ProcessByte (byte input)
 Encrypt or decrypt a byte. More...
 
virtual void Seek (lword pos)
 Seek to an absolute position. More...
 
virtual bool IsForwardTransformation () const =0
 Determines if the cipher is being operated in its forward direction. More...
 

Protected Types

enum  { REQUIRED_BLOCKSIZE = 16, HASH_BLOCKSIZE = 16 }
 
- Protected Types inherited from AuthenticatedSymmetricCipherBase
enum  State {
  State_Start, State_KeySet, State_IVSet, State_AuthUntransformed,
  State_AuthTransformed, State_AuthFooter
}
 

Protected Member Functions

bool AuthenticationIsOnPlaintext () const
 
unsigned int AuthenticationBlockSize () const
 
void SetKeyWithoutResync (const byte *userKey, size_t keylength, const NameValuePairs &params)
 
void Resync (const byte *iv, size_t len)
 
size_t AuthenticateBlocks (const byte *data, size_t len)
 
void AuthenticateLastHeaderBlock ()
 
void AuthenticateLastConfidentialBlock ()
 
void AuthenticateLastFooterBlock (byte *mac, size_t macSize)
 
SymmetricCipherAccessSymmetricCipher ()
 
virtual BlockCipherAccessBlockCipher ()=0
 
virtual GCM_TablesOption GetTablesOption () const =0
 
const BlockCipherGetBlockCipher () const
 
byteHashBuffer ()
 
byteHashKey ()
 
byteMulTable ()
 
void ReverseHashBufferIfNeeded ()
 
- Protected Member Functions inherited from AuthenticatedSymmetricCipherBase
void AuthenticateData (const byte *data, size_t len)
 
const SymmetricCipherGetSymmetricCipher () const
 
- Protected Member Functions inherited from AuthenticatedSymmetricCipher
const AlgorithmGetAlgorithm () const
 Returns the base class Algorithm. More...
 
virtual void UncheckedSpecifyDataLengths (lword headerLength, lword messageLength, lword footerLength)
 
- Protected Member Functions inherited from SimpleKeyingInterface
virtual void UncheckedSetKey (const byte *key, unsigned int length, const NameValuePairs &params)=0
 Sets the key for this object without performing parameter validation. More...
 
void ThrowIfInvalidKeyLength (size_t length)
 Validates the key length. More...
 
void ThrowIfResynchronizable ()
 Validates the object. More...
 
void ThrowIfInvalidIV (const byte *iv)
 Validates the IV. More...
 
size_t ThrowIfInvalidIVLength (int length)
 Validates the IV length. More...
 
const byteGetIVAndThrowIfInvalid (const NameValuePairs &params, size_t &size)
 Retrieves and validates the IV. More...
 
void AssertValidKeyLength (size_t length) const
 Validates the key length. More...
 
- Protected Member Functions inherited from HashTransformation
void ThrowIfInvalidTruncatedSize (size_t size) const
 Validates a truncated digest size. More...
 

Protected Attributes

GCTR m_ctr
 
- Protected Attributes inherited from AuthenticatedSymmetricCipherBase
State m_state
 
unsigned int m_bufferedDataLength
 
lword m_totalHeaderLength
 
lword m_totalMessageLength
 
lword m_totalFooterLength
 
AlignedSecByteBlock m_buffer
 

Static Protected Attributes

static word16 s_reductionTable [256]
 
static volatile bool s_reductionTableInitialized = false
 

Additional Inherited Members

- Public Types inherited from SimpleKeyingInterface
enum  IV_Requirement {
  UNIQUE_IV = 0, RANDOM_IV, UNPREDICTABLE_RANDOM_IV, INTERNALLY_GENERATED_IV,
  NOT_RESYNCHRONIZABLE
}
 Secure IVs requirements as enumerated values. More...
 

Detailed Description

GCM block cipher base implementation.

Base implementation of the AuthenticatedSymmetricCipher interface

Since
Crypto++ 5.6.0

Definition at line 27 of file gcm.h.

Member Enumeration Documentation

anonymous enum
protected
Enumerator
REQUIRED_BLOCKSIZE 
HASH_BLOCKSIZE 

Definition at line 91 of file gcm.h.

Member Function Documentation

virtual BlockCipher& GCM_Base::AccessBlockCipher ( )
protectedpure virtual

Implemented in GCM_Final< T_BlockCipher, T_TablesOption, T_IsEncryption >.

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SymmetricCipher& GCM_Base::AccessSymmetricCipher ( )
inlineprotectedvirtual

Implements AuthenticatedSymmetricCipherBase.

Definition at line 71 of file gcm.h.

std::string GCM_Base::AlgorithmName ( ) const
inlinevirtual

Provides the name of this algorithm.

Returns
the standard algorithm name

The standard algorithm name can be a name like AES or AES/GCM. Some algorithms do not have standard names yet. For example, there is no standard algorithm name for Shoup's ECIES.

Implements AuthenticatedSymmetricCipher.

Definition at line 31 of file gcm.h.

size_t GCM_Base::AuthenticateBlocks ( const byte data,
size_t  len 
)
protectedvirtual

Implements AuthenticatedSymmetricCipherBase.

Definition at line 508 of file gcm.cpp.

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void GCM_Base::AuthenticateLastConfidentialBlock ( )
protectedvirtual

Reimplemented from AuthenticatedSymmetricCipherBase.

Definition at line 1073 of file gcm.cpp.

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void GCM_Base::AuthenticateLastFooterBlock ( byte mac,
size_t  macSize 
)
protectedvirtual

Implements AuthenticatedSymmetricCipherBase.

Definition at line 1080 of file gcm.cpp.

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void GCM_Base::AuthenticateLastHeaderBlock ( )
protectedvirtual

Implements AuthenticatedSymmetricCipherBase.

Definition at line 1063 of file gcm.cpp.

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unsigned int GCM_Base::AuthenticationBlockSize ( ) const
inlineprotectedvirtual

Implements AuthenticatedSymmetricCipherBase.

Definition at line 63 of file gcm.h.

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bool GCM_Base::AuthenticationIsOnPlaintext ( ) const
inlineprotectedvirtual

Implements AuthenticatedSymmetricCipherBase.

Definition at line 61 of file gcm.h.

size_t GCM_Base::DefaultKeyLength ( ) const
inlinevirtual

Returns default key length.

Returns
the default (recommended) key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 37 of file gcm.h.

unsigned int GCM_Base::DigestSize ( ) const
inlinevirtual

Provides the digest size of the hash.

Returns
the digest size of the hash.

Implements HashTransformation.

Definition at line 52 of file gcm.h.

const BlockCipher& GCM_Base::GetBlockCipher ( ) const
inlineprotected

Definition at line 76 of file gcm.h.

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virtual GCM_TablesOption GCM_Base::GetTablesOption ( ) const
protectedpure virtual

Implemented in GCM_Final< T_BlockCipher, T_TablesOption, T_IsEncryption >.

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size_t GCM_Base::GetValidKeyLength ( size_t  keylength) const
inlinevirtual

Returns a valid key length for the algorithm.

Parameters
keylengththe size of the key, in bytes
Returns
the valid key length, in bytes

keylength is provided in bytes, not bits. If keylength is less than MIN_KEYLENGTH, then the function returns MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH, then the function returns MAX_KEYLENGTH. if If keylength is a multiple of KEYLENGTH_MULTIPLE, then keylength is returned. Otherwise, the function returns a lower multiple of KEYLENGTH_MULTIPLE.

Implements SimpleKeyingInterface.

Definition at line 39 of file gcm.h.

byte* GCM_Base::HashBuffer ( )
inlineprotected

Definition at line 77 of file gcm.h.

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byte* GCM_Base::HashKey ( )
inlineprotected

Definition at line 78 of file gcm.h.

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bool GCM_Base::IsValidKeyLength ( size_t  keylength) const
inlinevirtual

Returns whether keylength is a valid key length.

Parameters
keylengththe requested keylength
Returns
true if keylength is valid, false otherwise

Internally the function calls GetValidKeyLength()

Reimplemented from SimpleKeyingInterface.

Definition at line 41 of file gcm.h.

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IV_Requirement GCM_Base::IVRequirement ( ) const
inlinevirtual

Minimal requirement for secure IVs.

Returns
the secure IV requirement of the algorithm

Implements SimpleKeyingInterface.

Definition at line 44 of file gcm.h.

unsigned int GCM_Base::IVSize ( ) const
inlinevirtual

Returns length of the IV accepted by this object.

Returns
the size of an IV, in bytes
Exceptions
NotImplemented()if the object does not support resynchronization

The default implementation throws NotImplemented

Reimplemented from SimpleKeyingInterface.

Definition at line 46 of file gcm.h.

lword GCM_Base::MaxHeaderLength ( ) const
inlinevirtual

Provides the maximum length of AAD that can be input.

Returns
the maximum length of AAD that can be input before the encrypted data

Implements AuthenticatedSymmetricCipher.

Definition at line 54 of file gcm.h.

unsigned int GCM_Base::MaxIVLength ( ) const
inlinevirtual

Provides the maximum size of an IV.

Returns
maximal length of IVs accepted by this object, in bytes
Exceptions
NotImplemented()if the object does not support resynchronization

Reimplemented from SimpleKeyingInterface.

Definition at line 50 of file gcm.h.

size_t GCM_Base::MaxKeyLength ( ) const
inlinevirtual

Returns largest valid key length.

Returns
the maximum key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 35 of file gcm.h.

lword GCM_Base::MaxMessageLength ( ) const
inlinevirtual

Provides the maximum length of encrypted data.

Returns
the maximum length of encrypted data

Implements AuthenticatedSymmetricCipher.

Definition at line 56 of file gcm.h.

unsigned int GCM_Base::MinIVLength ( ) const
inlinevirtual

Provides the minimum size of an IV.

Returns
minimal length of IVs accepted by this object, in bytes
Exceptions
NotImplemented()if the object does not support resynchronization

Reimplemented from SimpleKeyingInterface.

Definition at line 48 of file gcm.h.

size_t GCM_Base::MinKeyLength ( ) const
inlinevirtual

Returns smallest valid key length.

Returns
the minimum key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 33 of file gcm.h.

byte* GCM_Base::MulTable ( )
inlineprotected

Definition at line 79 of file gcm.h.

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unsigned int GCM_Base::OptimalDataAlignment ( ) const
virtual

Provides input and output data alignment for optimal performance.

Returns
the input data alignment that provides optimal performance

Reimplemented from StreamTransformation.

Definition at line 482 of file gcm.cpp.

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void GCM_Base::Resync ( const byte iv,
size_t  len 
)
protectedvirtual

Implements AuthenticatedSymmetricCipherBase.

Definition at line 437 of file gcm.cpp.

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void GCM_Base::ReverseHashBufferIfNeeded ( )
inlineprotected

Definition at line 417 of file gcm.cpp.

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void GCM_Base::SetKeyWithoutResync ( const byte userKey,
size_t  keylength,
const NameValuePairs params 
)
protectedvirtual

Implements AuthenticatedSymmetricCipherBase.

Definition at line 225 of file gcm.cpp.

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Member Data Documentation

GCTR GCM_Base::m_ctr
protected

Definition at line 88 of file gcm.h.

word16 GCM_Base::s_reductionTable
staticprotected

Definition at line 89 of file gcm.h.

volatile bool GCM_Base::s_reductionTableInitialized = false
staticprotected

Definition at line 90 of file gcm.h.


The documentation for this class was generated from the following files: