Crypto++ 8.7
Free C++ class library of cryptographic schemes
Public Member Functions | Static Public Member Functions | Static Public Attributes | List of all members
Poly1305_Base< T > Class Template Reference

Poly1305 message authentication code base class. More...

#include <poly1305.h>

+ Inheritance diagram for Poly1305_Base< T >:

Public Member Functions

void Resynchronize (const byte *iv, int ivLength=-1)
 Resynchronize with an IV. More...
 
void GetNextIV (RandomNumberGenerator &rng, byte *iv)
 Retrieves a secure IV for the next message. More...
 
void UncheckedSetKey (const byte *key, unsigned int length, const NameValuePairs &params)
 Sets the key for this object without performing parameter validation. More...
 
void Update (const byte *input, size_t length)
 Updates a hash with additional input. More...
 
void TruncatedFinal (byte *mac, size_t size)
 Computes the hash of the current message. More...
 
void Restart ()
 Restart the hash. More...
 
unsigned int BlockSize () const
 Provides the block size of the compression function. More...
 
unsigned int DigestSize () const
 Provides the digest size of the hash. More...
 
std::string AlgorithmProvider () const
 Retrieve the provider of this algorithm. More...
 
- Public Member Functions inherited from SimpleKeyingInterface
virtual size_t MinKeyLength () const =0
 Returns smallest valid key length. More...
 
virtual size_t MaxKeyLength () const =0
 Returns largest valid key length. More...
 
virtual size_t DefaultKeyLength () const =0
 Returns default key length. More...
 
virtual size_t GetValidKeyLength (size_t keylength) const =0
 Returns a valid key length for the algorithm. More...
 
virtual bool IsValidKeyLength (size_t keylength) const
 Returns whether keylength is a valid key length. More...
 
virtual void SetKey (const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)
 Sets or reset the key of this object. More...
 
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...
 
virtual IV_Requirement IVRequirement () const =0
 Minimal requirement for secure IVs. 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...
 
virtual unsigned int IVSize () const
 Returns length of the IV accepted by this object. More...
 
unsigned int DefaultIVLength () const
 Provides the default size of an IV. More...
 
virtual unsigned int MinIVLength () const
 Provides the minimum size of an IV. More...
 
virtual unsigned int MaxIVLength () const
 Provides the maximum size of an IV. More...
 
virtual void Resynchronize (const byte *iv, int ivLength=-1)
 Resynchronize with 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
HashTransformationRef ()
 Provides a reference to this object. More...
 
virtual void Update (const byte *input, size_t length)=0
 Updates a hash with additional input. 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...
 
virtual void Restart ()
 Restart the hash. More...
 
virtual unsigned int DigestSize () const =0
 Provides the digest size of the hash. 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 unsigned int OptimalDataAlignment () const
 Provides input and output data alignment for optimal performance. 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 TruncatedFinal (byte *digest, size_t digestSize)=0
 Computes 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
 Algorithm (bool checkSelfTestStatus=true)
 Interface for all crypto algorithms. More...
 
virtual std::string AlgorithmName () const
 Provides the name of this algorithm. More...
 
virtual std::string AlgorithmProvider () const
 Retrieve the provider of this algorithm. More...
 
- Public Member Functions inherited from Clonable
virtual ClonableClone () const
 Copies this object. More...
 

Static Public Member Functions

static std::string StaticAlgorithmName ()
 
- Static Public Member Functions inherited from FixedKeyLength< 32, SimpleKeyingInterface::UNIQUE_IV, 16 >
static size_t StaticGetValidKeyLength (size_t keylength)
 The default key length for the algorithm provided by a static function. More...
 

Static Public Attributes

static const int DIGESTSIZE =T::BLOCKSIZE
 
static const int BLOCKSIZE =T::BLOCKSIZE
 
- Static Public Attributes inherited from FixedKeyLength< 32, SimpleKeyingInterface::UNIQUE_IV, 16 >
static const int KEYLENGTH
 The default key length used by the algorithm provided as a constant. More...
 
static const int MIN_KEYLENGTH
 The minimum key length used by the algorithm provided as a constant. More...
 
static const int MAX_KEYLENGTH
 The maximum key length used by the algorithm provided as a constant. More...
 
static const int DEFAULT_KEYLENGTH
 The default key length used by the algorithm provided as a constant. More...
 
static const int IV_REQUIREMENT
 The default IV requirements for the algorithm provided as a constant. More...
 
static const int IV_LENGTH
 The default IV length used by the algorithm provided as a constant. More...
 

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

template<class T>
class Poly1305_Base< T >

Poly1305 message authentication code base class.

Template Parameters
TBlockCipherDocumentation derived class with 16-byte key and 16-byte blocksize

Poly1305_Base is the base class of Bernstein's Poly1305 algorithm.

Since
Crypto++ 6.0

Definition at line 43 of file poly1305.h.

Constructor & Destructor Documentation

◆ ~Poly1305_Base()

template<class T >
virtual Poly1305_Base< T >::~Poly1305_Base ( )
inlinevirtual

Definition at line 54 of file poly1305.h.

◆ Poly1305_Base()

template<class T >
Poly1305_Base< T >::Poly1305_Base ( )
inline

Definition at line 55 of file poly1305.h.

Member Function Documentation

◆ StaticAlgorithmName()

template<class T >
static std::string Poly1305_Base< T >::StaticAlgorithmName ( )
inlinestatic

Definition at line 49 of file poly1305.h.

◆ Resynchronize()

template<class T >
void Poly1305_Base< T >::Resynchronize ( const byte iv,
int  ivLength = -1 
)
virtual

Resynchronize with an IV.

Parameters
ivthe initialization vector
ivLengththe size of the initialization vector, in bytes

Resynchronize() resynchronizes with an IV provided by the caller. ivLength=-1 means use IVSize().

Exceptions
NotImplemented()if the object does not support resynchronization

Reimplemented from SimpleKeyingInterface.

Definition at line 283 of file poly1305.cpp.

◆ GetNextIV()

template<class T >
void Poly1305_Base< T >::GetNextIV ( RandomNumberGenerator rng,
byte iv 
)
virtual

Retrieves a secure IV for the next message.

Parameters
rnga RandomNumberGenerator to produce keying material
iva block of bytes to receive the IV

The IV must be at least IVSize() in length.

This method should be called after you finish encrypting one message and are ready to start the next one. After calling it, you must call SetKey() or Resynchronize(). before using this object again.

Internally, the base class implementation calls RandomNumberGenerator's GenerateBlock()

Note
This method is not implemented on decryption objects.

Reimplemented from SimpleKeyingInterface.

Definition at line 301 of file poly1305.cpp.

◆ UncheckedSetKey()

template<class T >
void Poly1305_Base< T >::UncheckedSetKey ( const byte key,
unsigned int  length,
const NameValuePairs params 
)
virtual

Sets the key for this object without performing parameter validation.

Parameters
keya byte buffer used to key the cipher
lengththe length of the byte buffer
paramsadditional parameters passed as NameValuePairs

key must be at least DEFAULT_KEYLENGTH in length.

Implements SimpleKeyingInterface.

Definition at line 190 of file poly1305.cpp.

◆ Update()

template<class T >
void Poly1305_Base< T >::Update ( const byte input,
size_t  length 
)
virtual

Updates a hash with additional input.

Parameters
inputthe additional input as a buffer
lengththe size of the buffer, in bytes

Implements HashTransformation.

Definition at line 219 of file poly1305.cpp.

◆ TruncatedFinal()

template<class T >
void Poly1305_Base< T >::TruncatedFinal ( byte digest,
size_t  digestSize 
)
virtual

Computes the hash of the current message.

Parameters
digesta pointer to the buffer to receive the hash
digestSizethe size of the truncated digest, in bytes

TruncatedFinal() calls Final() and then copies digestSize bytes to digest. The hash is restarted the hash for the next message.

Precondition
COUNTOF(digest) <= DigestSize() or COUNTOF(digest) <= HASH::DIGESTSIZE ensures the output byte buffer is a valid size.

Implements HashTransformation.

Definition at line 259 of file poly1305.cpp.

◆ Restart()

template<class T >
void Poly1305_Base< T >::Restart
virtual

Restart the hash.

Discards the current state, and restart for a new message

Reimplemented from HashTransformation.

Definition at line 307 of file poly1305.cpp.

◆ BlockSize()

template<class T >
unsigned int Poly1305_Base< T >::BlockSize ( ) const
inlinevirtual

Provides the block size of the compression function.

Returns
block size of the compression function, in bytes

BlockSize() will return 0 if the hash is not block based or does not have an equivalent block size. For example, Keccak and SHA-3 do not have a block size, but they do have an equivalent block size called rate expressed as r.

Reimplemented from HashTransformation.

Definition at line 65 of file poly1305.h.

◆ DigestSize()

template<class T >
unsigned int Poly1305_Base< T >::DigestSize ( ) const
inlinevirtual

Provides the digest size of the hash.

Returns
the digest size of the hash.

Implements HashTransformation.

Definition at line 66 of file poly1305.h.

◆ AlgorithmProvider()

template<class T >
std::string Poly1305_Base< T >::AlgorithmProvider
virtual

Retrieve the provider of this algorithm.

Returns
the algorithm provider

The algorithm provider can be a name like "C++", "SSE", "NEON", "AESNI", "ARMv8" and "Power8". C++ is standard C++ code. Other labels, like SSE, usually indicate a specialized implementation using instructions from a higher instruction set architecture (ISA). Future labels may include external hardware like a hardware security module (HSM).

Generally speaking Wei Dai's original IA-32 ASM code falls under "SSE2". Labels like "SSSE3" and "SSE4.1" follow after Wei's code and use intrinsics instead of ASM.

Algorithms which combine different instructions or ISAs provide the dominant one. For example on x86 AES/GCM returns "AESNI" rather than "CLMUL" or "AES+SSE4.1" or "AES+CLMUL" or "AES+SSE4.1+CLMUL".

Note
Provider is not universally implemented yet.
Since
Crypto++ 8.0

Reimplemented from Algorithm.

Definition at line 184 of file poly1305.cpp.

Member Data Documentation

◆ DIGESTSIZE

template<class T >
const int Poly1305_Base< T >::DIGESTSIZE =T::BLOCKSIZE
static

Definition at line 51 of file poly1305.h.

◆ BLOCKSIZE

template<class T >
const int Poly1305_Base< T >::BLOCKSIZE =T::BLOCKSIZE
static

Definition at line 52 of file poly1305.h.


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