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CODEX_ThresholdCrypto::ThresholdElGamalCrypto< CODEX_VSS::Combinatoric< NumT, ThreshT > > Class Template Reference

Specialization of ThresholdElGamalCrypto for combinatoric SS. More...

#include <CombinatoricThresholdElGamal.h>

Collaboration diagram for CODEX_ThresholdCrypto::ThresholdElGamalCrypto< CODEX_VSS::Combinatoric< NumT, ThreshT > >:

[legend]List of all members.

Public Types
typedef CODEX_VSS::Combinatoric< NumT, ThreshT >	ShareType
	Export the type of the sharing.
typedef CODEX_VSS::ShareSet< ShareType >	SetType
	Export the type of the share set.
typedef CODEX_Ciphers::ElGamalCipherText	CipherTextType
	Export the type of the ciphertext.
Public Methods
	ThresholdElGamalCrypto (const CODEX_ASN1::BigNumber &modulus)
	Constructor.
void	decrypt (const ShareType &shares, const CipherTextType &ciphertext, ShareType &partials) const
	Generate partial decryptions.
BIGNUM *	thresholdDecrypt (const SetType &partials, const CipherTextType &ciphertext) const
	Perform a threshold operation from shares.

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Detailed Description

template<unsigned int NumT, unsigned int ThreshT>
class CODEX_ThresholdCrypto::ThresholdElGamalCrypto< CODEX_VSS::Combinatoric< NumT, ThreshT > >

Specialization of ThresholdElGamalCrypto for combinatoric SS.

Definition at line 32 of file CombinatoricThresholdElGamal.h.

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Member Function Documentation

template<unsigned int NumT, unsigned int ThreshT> BIGNUM* CODEX_ThresholdCrypto::ThresholdElGamalCrypto< CODEX_VSS::Combinatoric< NumT, ThreshT > >::thresholdDecrypt (  const SetType &    partials, const CipherTextType &    ciphertext )  const [inline]

Perform a threshold operation from shares. This is not simply the recover function for ShareType, since recover is additive, while the threshold operation is multiplicative. Parameters: partials  The shares that form partial results of the threshold operation. ciphertext  The ciphertext being decrypted, needed because the partial results only relate to half of the ciphertext. Returns: A threshold ElGamal result, or 0 if not enough shares were provided. Definition at line 81 of file CombinatoricThresholdElGamal.h. References CODEX_Ciphers::ElGamalCipherText::c2(), and CODEX_ASN1::BigNumber::value().

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

• CombinatoricThresholdElGamal.h

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