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# LUCFunction Class Reference

`#include <luc.h>`

Inheritance diagram for LUCFunction:

List of all members.

## Detailed Description

The LUC function.

This class is here for historical and pedagogical interest. It has no practical advantages over other trapdoor functions and probably shouldn't be used in production software. The discrete log based LUC schemes defined later in this .h file may be of more practical interest.

Definition at line 22 of file luc.h.

## Public Member Functions
void | Initialize (const Integer &n, const Integer &e)
void | BERDecode (BufferedTransformation &bt)
void | DEREncode (BufferedTransformation &bt) const
Integer | ApplyFunction (const Integer &x) const
Integer | PreimageBound () const
Integer | ImageBound () const
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
| to be implemented by derived classes, users should use one of the above functions instead
void | AssignFrom (const NameValuePairs &source)
| assign values from source to this object
const Integer & | GetModulus () const
const Integer & | GetPublicExponent () const
void | SetModulus (const Integer &n)
void | SetPublicExponent (const Integer &e)
Integer | ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const
bool | IsRandomized () const
virtual Integer | MaxPreimage () const
virtual Integer | MaxImage () const
## Protected Attributes
Integer | m_n
Integer | m_e

## Member Function Documentation

bool LUCFunction::Validate | ( | RandomNumberGenerator & | rng,
|  | unsigned int | level |
| ) |  |  | const`[virtual]`

check this object for errors

Parameters:

  | level | denotes the level of thoroughness: 0 - using this object won't cause a crash or exception (rng is ignored) 1 - this object will probably function (encrypt, sign, etc.) correctly (but may not check for weak keys and such) 2 - make sure this object will function correctly, and do reasonable security checks 3 - do checks that may take a long time

Returns:
  true if the tests pass

Implements CryptoMaterial.

Reimplemented in InvertibleLUCFunction.

Definition at line 69 of file luc.cpp.

References Integer::IsOdd(), m_e, m_n, and Integer::One().

Referenced by InvertibleLUCFunction::Validate().

void LUCFunction::AssignFrom | ( | const NameValuePairs & | source | ) | `[virtual]`

assign values from source to this object

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

Implements CryptoMaterial.

Reimplemented in InvertibleLUCFunction.

Definition at line 85 of file luc.cpp.

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

- luc.h
- luc.cpp