Applies the trapdoor function. More...
Public Member Functions | |
Integer | ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const |
Applies the trapdoor function. | |
bool | IsRandomized () const |
Determines if the encryption algorithm is randomized. | |
virtual Integer | ApplyFunction (const Integer &x) const =0 |
Applies the trapdoor. | |
virtual Integer | PreimageBound () const =0 |
Returns the maximum size of a message before the trapdoor function is applied. | |
virtual Integer | ImageBound () const =0 |
Returns the maximum size of a message after the trapdoor function is applied. | |
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 message after the trapdoor function is applied bound to a public key. |
Applies the trapdoor function.
ApplyFunction()
is the foundation for encrypting a message under a public key. Derived classes will override it at some point.
Definition at line 127 of file pubkey.h.
Integer TrapdoorFunction::ApplyRandomizedFunction | ( | RandomNumberGenerator & | rng, | |
const Integer & | x | |||
) | const [inline, virtual] |
Applies the trapdoor function.
rng | a RandomNumberGenerator derived class | |
x | the message on which the encryption function is applied |
ApplyRandomizedFunction
is a generalization of encryption under a public key cryptosystem. The RandomNumberGenerator
may (or may not) be required.
Internally, ApplyRandomizedFunction()
calls ApplyFunction()
without the RandomNumberGenerator
.
Implements RandomizedTrapdoorFunction.
bool TrapdoorFunction::IsRandomized | ( | ) | const [inline, virtual] |
Determines if the encryption algorithm is randomized.
true
if the encryption algorithm is randomized, false
otherwiseIf IsRandomized()
returns false
, then NullRNG()
can be used.
Reimplemented from RandomizedTrapdoorFunction.
Applies the trapdoor.
x | the message on which the encryption function is applied |
x
encrypted under the public keyApplyFunction
is a generalization of encryption under a public key cryptosystem. Derived classes must implement it.
Implemented in ESIGNFunction, LUCFunction, RabinFunction, RSAFunction, RSAFunction_ISO, and RWFunction.
virtual Integer TrapdoorFunctionBounds::PreimageBound | ( | ) | const [pure virtual, inherited] |
Returns the maximum size of a message before the trapdoor function is applied.
Derived classes must implement PreimageBound()
.
Implemented in ESIGNFunction, LUCFunction, RabinFunction, RSAFunction, RSAFunction_ISO, InvertibleRSAFunction_ISO, and RWFunction.
virtual Integer TrapdoorFunctionBounds::ImageBound | ( | ) | const [pure virtual, inherited] |
Returns the maximum size of a message after the trapdoor function is applied.
Derived classes must implement ImageBound()
.
Implemented in ESIGNFunction, LUCFunction, RabinFunction, RSAFunction, and RWFunction.
virtual Integer TrapdoorFunctionBounds::MaxPreimage | ( | ) | const [inline, virtual, inherited] |
Returns the maximum size of a message before the trapdoor function is applied bound to a public key.
The default implementation returns PreimageBound() - 1
.
virtual Integer TrapdoorFunctionBounds::MaxImage | ( | ) | const [inline, virtual, inherited] |
Returns the maximum size of a message after the trapdoor function is applied bound to a public key.
The default implementation returns ImageBound() - 1
.
Definition at line 89 of file pubkey.h.
Referenced by ESIGNFunction::ApplyFunction().