InvertibleRSAFunction Class Reference

RSA trapdoor function using the private key. More...

#include <rsa.h>

Inheritance diagram for InvertibleRSAFunction:

Public Member Functions
void	Initialize (RandomNumberGenerator &rng, unsigned int modulusBits, const Integer &e=17)
	Create a RSA private key.
void	Initialize (const Integer &n, const Integer &e, const Integer &d, const Integer &p, const Integer &q, const Integer &dp, const Integer &dq, const Integer &u)
	Initialize a RSA private key.
void	Initialize (const Integer &n, const Integer &e, const Integer &d)
	Initialize a RSA private key.
void	BERDecode (BufferedTransformation &bt)
	Decode this object from a BufferedTransformation.
void	DEREncode (BufferedTransformation &bt) const
	Encode this object into a BufferedTransformation.
void	Load (BufferedTransformation &bt)
	BER decode ASN.1 object.
void	Save (BufferedTransformation &bt) const
	DER encode ASN.1 object.
OID	GetAlgorithmID () const
	Retrieves the OID of the algorithm.
void	BERDecodePrivateKey (BufferedTransformation &bt, bool parametersPresent, size_t size)
	Decode privateKey part of privateKeyInfo.
void	DEREncodePrivateKey (BufferedTransformation &bt) const
	Encode privateKey part of privateKeyInfo.
Integer	CalculateInverse (RandomNumberGenerator &rng, const Integer &x) const
	Calculates the inverse of an element.
bool	Validate (RandomNumberGenerator &rng, unsigned int level) const
	Check this object for errors.
void	GenerateRandom (RandomNumberGenerator &rng, const NameValuePairs &alg)
	Generate a random key or crypto parameters.
bool	GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
	Get a named value.
void	AssignFrom (const NameValuePairs &source)
	Assign values to this object.
const Integer &	GetPrime1 () const
const Integer &	GetPrime2 () const
const Integer &	GetPrivateExponent () const
const Integer &	GetModPrime1PrivateExponent () const
const Integer &	GetModPrime2PrivateExponent () const
const Integer &	GetMultiplicativeInverseOfPrime2ModPrime1 () const
void	SetPrime1 (const Integer &p)
void	SetPrime2 (const Integer &q)
void	SetPrivateExponent (const Integer &d)
void	SetModPrime1PrivateExponent (const Integer &dp)
void	SetModPrime2PrivateExponent (const Integer &dq)
void	SetMultiplicativeInverseOfPrime2ModPrime1 (const Integer &u)
Public Member Functions inherited from RSAFunction
void	Initialize (const Integer &n, const Integer &e)
	Initialize a RSA public key.
OID	GetAlgorithmID () const
	Retrieves the OID of the algorithm.
void	BERDecodePublicKey (BufferedTransformation &bt, bool parametersPresent, size_t size)
	Decode subjectPublicKey part of subjectPublicKeyInfo.
void	DEREncodePublicKey (BufferedTransformation &bt) const
	Encode subjectPublicKey part of subjectPublicKeyInfo.
bool	Validate (RandomNumberGenerator &rng, unsigned int level) const
	Check this object for errors.
bool	GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
	Get a named value.
void	AssignFrom (const NameValuePairs &source)
	Assign values to this object.
Integer	ApplyFunction (const Integer &x) const
	Applies the trapdoor.
Integer	PreimageBound () const
	Returns the maximum size of a message before the trapdoor function is applied.
Integer	ImageBound () const
	Returns the maximum size of a representation after the trapdoor function is applied.
const Integer &	GetModulus () const
const Integer &	GetPublicExponent () const
void	SetModulus (const Integer &n)
void	SetPublicExponent (const Integer &e)
Public Member Functions inherited from TrapdoorFunction
Integer	ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const
	Applies the trapdoor function.
bool	IsRandomized () const
	Determines if the encryption algorithm is randomized.
Public Member Functions inherited from TrapdoorFunctionBounds
virtual Integer	MaxPreimage () const
	Returns the maximum size of a message before the trapdoor function is applied bound to a public key.
virtual Integer	MaxImage () const
	Returns the maximum size of a representation after the trapdoor function is applied bound to a public key.
Public Member Functions inherited from X509PublicKey
void	BERDecode (BufferedTransformation &bt)
	Decode this object from a BufferedTransformation.
void	DEREncode (BufferedTransformation &bt) const
	Encode this object into a BufferedTransformation.
virtual bool	BERDecodeAlgorithmParameters (BufferedTransformation &bt)
	Decode algorithm parameters.
virtual bool	DEREncodeAlgorithmParameters (BufferedTransformation &bt) const
	Encode algorithm parameters.
Public Member Functions inherited from ASN1Object
virtual void	BEREncode (BufferedTransformation &bt) const
	Encode this object into a BufferedTransformation.
Public Member Functions inherited from CryptoMaterial
virtual void	ThrowIfInvalid (RandomNumberGenerator &rng, unsigned int level) const
	Check this object for errors.
virtual bool	SupportsPrecomputation () const
	Determines whether the object supports precomputation.
virtual void	Precompute (unsigned int precomputationStorage)
	Perform precomputation.
virtual void	LoadPrecomputation (BufferedTransformation &storedPrecomputation)
	Retrieve previously saved precomputation.
virtual void	SavePrecomputation (BufferedTransformation &storedPrecomputation) const
	Save precomputation for later use.
void	DoQuickSanityCheck () const
	Perform a quick sanity check.
Public Member Functions inherited from NameValuePairs
template<class T >
bool	GetThisObject (T &object) const
	Get a copy of this object or subobject.
template<class T >
bool	GetThisPointer (T *&ptr) const
	Get a pointer to this object.
template<class T >
bool	GetValue (const char *name, T &value) const
	Get a named value.
template<class T >
T	GetValueWithDefault (const char *name, T defaultValue) const
	Get a named value.
CRYPTOPP_DLL std::string	GetValueNames () const
	Get a list of value names that can be retrieved.
CRYPTOPP_DLL bool	GetIntValue (const char *name, int &value) const
	Get a named value with type int.
CRYPTOPP_DLL int	GetIntValueWithDefault (const char *name, int defaultValue) const
	Get a named value with type int, with default.
CRYPTOPP_DLL bool	GetWord64Value (const char *name, word64 &value) const
	Get a named value with type word64.
CRYPTOPP_DLL word64	GetWord64ValueWithDefault (const char *name, word64 defaultValue) const
	Get a named value with type word64, with default.
template<class T >
void	GetRequiredParameter (const char *className, const char *name, T &value) const
	Retrieves a required name/value pair.
CRYPTOPP_DLL void	GetRequiredIntParameter (const char *className, const char *name, int &value) const
	Retrieves a required name/value pair.
Public Member Functions inherited from TrapdoorFunctionInverse
Integer	CalculateRandomizedInverse (RandomNumberGenerator &rng, const Integer &x) const
	Applies the inverse of the trapdoor function.
bool	IsRandomized () const
	Determines if the decryption algorithm is randomized.
Public Member Functions inherited from PKCS8PrivateKey
void	BERDecode (BufferedTransformation &bt)
	Decode this object from a BufferedTransformation.
void	DEREncode (BufferedTransformation &bt) const
	Encode this object into a BufferedTransformation.
virtual bool	BERDecodeAlgorithmParameters (BufferedTransformation &bt)
	Decode optional parameters.
virtual bool	DEREncodeAlgorithmParameters (BufferedTransformation &bt) const
	Encode optional parameters.
virtual void	BERDecodeOptionalAttributes (BufferedTransformation &bt)
	Decode optional attributes.
virtual void	DEREncodeOptionalAttributes (BufferedTransformation &bt) const
	Encode optional attributes.
Public Member Functions inherited from GeneratableCryptoMaterial
void	GenerateRandomWithKeySize (RandomNumberGenerator &rng, unsigned int keySize)
	Generate a random key or crypto parameters.

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.

Detailed Description

RSA trapdoor function using the private key.

Since

Crypto++ 1.0

Definition at line 62 of file rsa.h.

Member Function Documentation

Initialize() [1/3]

void InvertibleRSAFunction::Initialize	(	RandomNumberGenerator &	rng,
		unsigned int	modulusBits,
		const Integer &	e = 17 )

Create a RSA private key.

Parameters

rng	a RandomNumberGenerator derived class
modulusBits	the size of the modulus, in bits
e	the desired public exponent

Initialize() creates a new keypair using a public exponent of 17.

This function overload of Initialize() creates a new private key because it takes a RandomNumberGenerator() as a parameter. If you have an existing keypair, then use one of the other Initialize() overloads.

Initialize() [2/3]

void InvertibleRSAFunction::Initialize ( const Integer & n, const Integer & e, const Integer & d, const Integer & p, const Integer & q, const Integer & dp, const Integer & dq, const Integer & u )

inline

Initialize a RSA private key.

Parameters

n	modulus
e	public exponent
d	private exponent
p	first prime factor
q	second prime factor
dp	d mod p
dq	d mod q
u	q-1 mod p

This Initialize() function overload initializes a private key from existing parameters.

Definition at line 87 of file rsa.h.

Initialize() [3/3]

void InvertibleRSAFunction::Initialize	(	const Integer &	n,
		const Integer &	e,
		const Integer &	d )

Initialize a RSA private key.

Parameters

n	modulus
e	public exponent
d	private exponent

This Initialize() function overload initializes a private key from existing parameters. Initialize() will factor n using d and populate {p,q,dp,dq,u}.

BERDecode()

void InvertibleRSAFunction::BERDecode ( BufferedTransformation & bt )

inlinevirtual

Decode this object from a BufferedTransformation.

Parameters

bt	BufferedTransformation object

Uses Basic Encoding Rules (BER)

Implements ASN1Object.

Definition at line 99 of file rsa.h.

DEREncode()

void InvertibleRSAFunction::DEREncode ( BufferedTransformation & bt ) const

inlinevirtual

Encode this object into a BufferedTransformation.

Parameters

bt	BufferedTransformation object

Uses Distinguished Encoding Rules (DER)

Implements ASN1Object.

Definition at line 101 of file rsa.h.

Load()

void InvertibleRSAFunction::Load ( BufferedTransformation & bt )

inlinevirtual

BER decode ASN.1 object.

Parameters

bt	BufferedTransformation object

Reimplemented from ASN1CryptoMaterial< PublicKey >.

Definition at line 103 of file rsa.h.

Save()

void InvertibleRSAFunction::Save ( BufferedTransformation & bt ) const

inlinevirtual

DER encode ASN.1 object.

Parameters

bt	BufferedTransformation object

Save() will write the OID associated with algorithm or scheme. In the case of public and private keys, this function writes the subjectPublicKeyInfo and privateKeyInfo parts.

Reimplemented from ASN1CryptoMaterial< PublicKey >.

Definition at line 105 of file rsa.h.

GetAlgorithmID()

OID InvertibleRSAFunction::GetAlgorithmID ( ) const

inlinevirtual

Retrieves the OID of the algorithm.

Returns

OID of the algorithm

Implements X509PublicKey.

Definition at line 107 of file rsa.h.

BERDecodePrivateKey()

void InvertibleRSAFunction::BERDecodePrivateKey ( BufferedTransformation & bt, bool parametersPresent, size_t size )

virtual

Decode privateKey part of privateKeyInfo.

Parameters

bt	BufferedTransformation object
parametersPresent	flag indicating if algorithm parameters are present
size	number of octets to read for the parameters, in bytes

BERDecodePrivateKey() the decodes privateKey part of privateKeyInfo, without the OCTET STRING header.

When parametersPresent = true then BERDecodePrivateKey() calls BERDecodeAlgorithmParameters() to parse algorithm parameters.

See also

BERDecodeAlgorithmParameters

Implements PKCS8PrivateKey.

DEREncodePrivateKey()

void InvertibleRSAFunction::DEREncodePrivateKey ( BufferedTransformation & bt ) const

virtual

Encode privateKey part of privateKeyInfo.

Parameters

bt	BufferedTransformation object

DEREncodePrivateKey() encodes the privateKey part of privateKeyInfo, without the OCTET STRING header.

See also

DEREncodeAlgorithmParameters

Implements PKCS8PrivateKey.

CalculateInverse()

Integer InvertibleRSAFunction::CalculateInverse ( RandomNumberGenerator & rng, const Integer & x ) const

virtual

Calculates the inverse of an element.

Parameters

rng	a RandomNumberGenerator derived class
x	the element

Returns

the inverse of the element in the group

Implements TrapdoorFunctionInverse.

Reimplemented in InvertibleRSAFunction_ISO.

Validate()

bool InvertibleRSAFunction::Validate ( RandomNumberGenerator & rng, unsigned int level ) const

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()

Implements CryptoMaterial.

GenerateRandom()

void InvertibleRSAFunction::GenerateRandom ( RandomNumberGenerator & rng, const NameValuePairs & params )

virtual

Generate a random key or crypto parameters.

Parameters

rng	a RandomNumberGenerator to produce keying material
params	additional initialization parameters

Exceptions

KeyingErr

if a key can't be generated or algorithm parameters are invalid

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

Reimplemented from GeneratableCryptoMaterial.

GetVoidValue()

bool InvertibleRSAFunction::GetVoidValue ( const char * name, const std::type_info & valueType, void * pValue ) const

virtual

Get a named value.

Parameters

name	the name of the object or value to retrieve
valueType	reference to a variable that receives the value
pValue	void pointer to a variable that receives the value

Returns

true if the value was retrieved, false otherwise

GetVoidValue() retrieves the value of name if it exists.

Note

GetVoidValue() is an internal function and should be implemented by derived classes. Users should use one of the other functions instead.

See also

GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(), GetRequiredParameter() and GetRequiredIntParameter()

Implements NameValuePairs.

AssignFrom()

void InvertibleRSAFunction::AssignFrom ( const NameValuePairs & source )

virtual

Assign values to this object.

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

Implements CryptoMaterial.

GetPrime1()

const Integer & InvertibleRSAFunction::GetPrime1 ( ) const

inline

Definition at line 122 of file rsa.h.

GetPrime2()

const Integer & InvertibleRSAFunction::GetPrime2 ( ) const

inline

Definition at line 123 of file rsa.h.

GetPrivateExponent()

const Integer & InvertibleRSAFunction::GetPrivateExponent ( ) const

inline

Definition at line 124 of file rsa.h.

GetModPrime1PrivateExponent()

const Integer & InvertibleRSAFunction::GetModPrime1PrivateExponent ( ) const

inline

Definition at line 125 of file rsa.h.

GetModPrime2PrivateExponent()

const Integer & InvertibleRSAFunction::GetModPrime2PrivateExponent ( ) const

inline

Definition at line 126 of file rsa.h.

GetMultiplicativeInverseOfPrime2ModPrime1()

const Integer & InvertibleRSAFunction::GetMultiplicativeInverseOfPrime2ModPrime1 ( ) const

inline

Definition at line 127 of file rsa.h.

SetPrime1()

void InvertibleRSAFunction::SetPrime1 ( const Integer & p )

inline

Definition at line 129 of file rsa.h.

SetPrime2()

void InvertibleRSAFunction::SetPrime2 ( const Integer & q )

inline

Definition at line 130 of file rsa.h.

SetPrivateExponent()

void InvertibleRSAFunction::SetPrivateExponent ( const Integer & d )

inline

Definition at line 131 of file rsa.h.

SetModPrime1PrivateExponent()

void InvertibleRSAFunction::SetModPrime1PrivateExponent ( const Integer & dp )

inline

Definition at line 132 of file rsa.h.

SetModPrime2PrivateExponent()

void InvertibleRSAFunction::SetModPrime2PrivateExponent ( const Integer & dq )

inline

Definition at line 133 of file rsa.h.

SetMultiplicativeInverseOfPrime2ModPrime1()

void InvertibleRSAFunction::SetMultiplicativeInverseOfPrime2ModPrime1 ( const Integer & u )

inline

Definition at line 134 of file rsa.h.

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

• rsa.h