Crypto++ 8.9 Free C++ class library of cryptographic schemes

Classes | Public Member Functions | List of all members
CryptoMaterial Class Referenceabstract

Interface for crypto material. More...

Inheritance diagram for CryptoMaterial:

## Classes
class | InvalidMaterial
| Exception thrown when invalid crypto material is detected. More...

## Public Member Functions
virtual void | AssignFrom (const NameValuePairs &source)=0
| Assign values to this object. More...
virtual bool | Validate (RandomNumberGenerator &rng, unsigned int level) const =0
| Check this object for errors. More...
virtual void | ThrowIfInvalid (RandomNumberGenerator &rng, unsigned int level) const
| Check this object for errors. More...
virtual void | Save (BufferedTransformation &bt) const
| Saves a key to a BufferedTransformation. More...
virtual void | Load (BufferedTransformation &bt)
| Loads a key from a BufferedTransformation. More...
virtual bool | SupportsPrecomputation () const
| Determines whether the object supports precomputation. More...
virtual void | Precompute (unsigned int precomputationStorage)
| Perform precomputation. More...
virtual void | LoadPrecomputation (BufferedTransformation &storedPrecomputation)
| Retrieve previously saved precomputation. More...
virtual void | SavePrecomputation (BufferedTransformation &storedPrecomputation) const
| Save precomputation for later use. More...
void | DoQuickSanityCheck () const
| Perform a quick sanity check. More...
Public Member Functions inherited from NameValuePairs
template<class T >
bool | GetThisObject (T &object) const
| Get a copy of this object or subobject. More...
template<class T >
bool | GetThisPointer (T *&ptr) const
| Get a pointer to this object. More...
template<class T >
bool | GetValue (const char *name, T &value) const
| Get a named value. More...
template<class T >
T | GetValueWithDefault (const char *name, T defaultValue) const
| Get a named value. More...
CRYPTOPP_DLL std::string | GetValueNames () const
| Get a list of value names that can be retrieved. More...
CRYPTOPP_DLL bool | GetIntValue (const char *name, int &value) const
| Get a named value with type int. More...
CRYPTOPP_DLL int | GetIntValueWithDefault (const char *name, int defaultValue) const
| Get a named value with type int, with default. More...
CRYPTOPP_DLL bool | GetWord64Value (const char *name, word64 &value) const
| Get a named value with type word64. More...
CRYPTOPP_DLL word64 | GetWord64ValueWithDefault (const char *name, word64 defaultValue) const
| Get a named value with type word64, with default. More...
template<class T >
void | GetRequiredParameter (const char *className, const char *name, T &value) const
| Retrieves a required name/value pair. More...
CRYPTOPP_DLL void | GetRequiredIntParameter (const char *className, const char *name, int &value) const
| Retrieves a required name/value pair. More...
virtual CRYPTOPP_DLL bool | GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const =0
| Get a named value. More...

## Additional Inherited Members
Static Public Member Functions inherited from NameValuePairs
static CRYPTOPP_DLL void | ThrowIfTypeMismatch (const char *name, const std::type_info &stored, const std::type_info &retrieving)
| Ensures an expected name and type is present. More...

## Detailed Description

Interface for crypto material.

CryptoMaterial() is an interface for crypto material, such as public keys, private keys and crypto parameters. Derived classes generally do not offer public methods such as GenerateRandom() and GenerateRandomWithKeySize().

See also
  GeneratableCryptoMaterial()

Definition at line 2394 of file cryptlib.h.

## Member Function Documentation

## ◆ AssignFrom()

virtual void CryptoMaterial::AssignFrom | ( | const NameValuePairs & | source | ) |
| pure virtual

Assign values to this object.

This function can be used to create a public key from a private key.

Implemented in XTR_DH, ed25519PublicKey, ed25519PrivateKey, x25519, InvertibleRWFunction, RWFunction, InvertibleRSAFunction, RSAFunction, InvertibleRabinFunction, RabinFunction, DL_PublicKeyImpl< GP >, DL_PrivateKeyImpl< GP >, InvertibleLUCFunction, LUCFunction, DL_GroupParameters_IntegerBasedImpl< GROUP_PRECOMP, BASE_PRECOMP >, DL_GroupParameters_IntegerBasedImpl< DL_GroupPrecomputation_LUC, DL_BasePrecomputation_LUC >, DL_GroupParameters_IntegerBasedImpl< ModExpPrecomputation >, DL_GroupParameters_IntegerBased, InvertibleESIGNFunction, ESIGNFunction, and DL_GroupParameters_EC< EC >.

## ◆ Validate()

virtual bool CryptoMaterial::Validate | ( | RandomNumberGenerator & | rng,
|  | unsigned int | level
| ) |  | const
| pure virtual

Check this object for errors.

Parameters

  rng | a RandomNumberGenerator for objects which use randomized testing
  level | the level of thoroughness

Returns
  true if the tests succeed, false otherwise

There are four levels of thoroughness:

- 0 - using this object won't cause a crash or exception
- 1 - this object will probably function, and encrypt, sign, other operations correctly
- 2 - ensure this object will function correctly, and perform reasonable security checks
- 3 - perform reasonable security checks, and do checks that may take a long time

Level 0 does not require a RandomNumberGenerator. A NullRNG() can be used for level 0. Level 1 may not check for weak keys and such. Levels 2 and 3 are recommended.

See also
  ThrowIfInvalid()

Implemented in XTR_DH, ed25519PublicKey, ed25519PrivateKey, x25519, InvertibleRWFunction, RWFunction, InvertibleRSAFunction, RSAFunction, InvertibleRabinFunction, RabinFunction, DL_PublicKeyImpl< GP >, DL_PrivateKeyImpl< GP >, DL_GroupParameters< T >, DL_GroupParameters< typename GROUP_PRECOMP::Element >, InvertibleLUCFunction, LUCFunction, InvertibleESIGNFunction, and ESIGNFunction.

## ◆ ThrowIfInvalid()

virtual void CryptoMaterial::ThrowIfInvalid | ( | RandomNumberGenerator & | rng,
|  | unsigned int | level
| ) |  | const
| inline virtual

Check this object for errors.

Parameters

  rng | a RandomNumberGenerator for objects which use randomized testing
  level | the level of thoroughness

Exceptions

  InvalidMaterial |

Internally, ThrowIfInvalid() calls Validate() and throws InvalidMaterial() if validation fails.

See also
  Validate()

Definition at line 2432 of file cryptlib.h.

## ◆ Save()

virtual void CryptoMaterial::Save | ( | BufferedTransformation & | bt | ) | const
| inline virtual

Saves a key to a BufferedTransformation.

Parameters

  bt | the destination BufferedTransformation

Exceptions

  NotImplemented |

Save() writes the material to a BufferedTransformation.

If the material is a key, then the key is written with ASN.1 DER encoding. The key includes an object identifier with an algorithm id, like a subjectPublicKeyInfo.

A "raw" key without the "key info" can be saved using a key's DEREncode() method.

If a derived class does not override Save(), then the base class throws NotImplemented().

Reimplemented in ed25519PublicKey, ed25519PrivateKey, x25519, InvertibleRWFunction, RWFunction, InvertibleRSAFunction, InvertibleESIGNFunction, ASN1CryptoMaterial< PrivateKey >, ASN1CryptoMaterial< DL_GroupParameters< Integer > >, and ASN1CryptoMaterial< PublicKey >.

Definition at line 2444 of file cryptlib.h.

## ◆ Load()

virtual void CryptoMaterial::Load | ( | BufferedTransformation & | bt | ) |
| inline virtual

Loads a key from a BufferedTransformation.

Parameters

  bt | the source BufferedTransformation

Exceptions

  KeyingErr |

Load() attempts to read material from a BufferedTransformation. If the material is a key that was generated outside the library, then the following usually applies:

- the key should be ASN.1 BER encoded
- the key should be a "key info"

"key info" means the key should have an object identifier with an algorithm id, like a subjectPublicKeyInfo.

To read a "raw" key without the "key info", then call the key's BERDecode() method.

Note
  Load() generally does not check that the key is valid. Call Validate(), if needed.

Reimplemented in ed25519PublicKey, ed25519PrivateKey, x25519, InvertibleRWFunction, RWFunction, InvertibleRSAFunction, InvertibleESIGNFunction, ASN1CryptoMaterial< PrivateKey >, ASN1CryptoMaterial< DL_GroupParameters< Integer > >, and ASN1CryptoMaterial< PublicKey >.

Definition at line 2461 of file cryptlib.h.

## ◆ SupportsPrecomputation()

virtual bool CryptoMaterial::SupportsPrecomputation | ( |  | ) | const
| inline virtual

Determines whether the object supports precomputation.

Returns
  true if the object supports precomputation, false otherwise

See also
  Precompute()

Reimplemented in InvertibleRWFunction, DL_PublicKeyImpl< GP >, DL_PrivateKeyImpl< GP >, DL_GroupParameters< T >, and DL_GroupParameters< typename GROUP_PRECOMP::Element >.

Definition at line 2467 of file cryptlib.h.

## ◆ Precompute()

virtual void CryptoMaterial::Precompute | ( | unsigned int | precomputationStorage | ) |
| inline virtual

Perform precomputation.

Parameters

  precomputationStorage | the suggested number of objects for the precompute table

Exceptions

  NotImplemented |

The exact semantics of Precompute() varies, but it typically means calculate a table of n objects that can be used later to speed up computation.

If a derived class does not override Precompute(), then the base class throws NotImplemented.

See also
  SupportsPrecomputation(), LoadPrecomputation(), SavePrecomputation()

Reimplemented in InvertibleRWFunction, DL_PublicKeyImpl< GP >, DL_PrivateKeyImpl< GP >, DL_GroupParameters< T >, and DL_GroupParameters< typename GROUP_PRECOMP::Element >.

Definition at line 2477 of file cryptlib.h.

## ◆ LoadPrecomputation()

virtual void CryptoMaterial::LoadPrecomputation | ( | BufferedTransformation & | storedPrecomputation | ) |
| inline virtual

Retrieve previously saved precomputation.

Parameters

  storedPrecomputation | BufferedTransformation with the saved precomputation

Exceptions

  NotImplemented |

See also
  SupportsPrecomputation(), Precompute()

Reimplemented in InvertibleRWFunction, DL_PublicKeyImpl< GP >, DL_PrivateKeyImpl< GP >, DL_GroupParameters< T >, and DL_GroupParameters< typename GROUP_PRECOMP::Element >.

Definition at line 2486 of file cryptlib.h.

## ◆ SavePrecomputation()

virtual void CryptoMaterial::SavePrecomputation | ( | BufferedTransformation & | storedPrecomputation | ) | const
| inline virtual

Save precomputation for later use.

Parameters

  storedPrecomputation | BufferedTransformation to write the precomputation

Exceptions

  NotImplemented |

See also
  SupportsPrecomputation(), Precompute()

Reimplemented in InvertibleRWFunction, DL_PublicKeyImpl< GP >, DL_PrivateKeyImpl< GP >, DL_GroupParameters< T >, and DL_GroupParameters< typename GROUP_PRECOMP::Element >.

Definition at line 2493 of file cryptlib.h.

## ◆ DoQuickSanityCheck()

void CryptoMaterial::DoQuickSanityCheck | ( |  | ) | const
| inline

Perform a quick sanity check.

DoQuickSanityCheck() is for internal library use, and it should not be called by library users.

Definition at line 2498 of file cryptlib.h.

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

- cryptlib.h