mpbgv

package
v6.1.0 Latest Latest
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 Go to latest Published: Oct 14, 2024 License: Apache-2.0 Imports: 7 Imported by: 0

Documentation

Overview

Package mpbgv implements homomorphic decryption to Linear-Secret-Shared-Shares (LSSS) and homomorphic re-encryption from LSSS, as well as interactive bootstrapping for the package `schemes/bgv` See `multiparty/README.md` for additional information on multiparty schemes.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func NewAdditiveShare 

func NewAdditiveShare(params bgv.Parameters) multiparty.AdditiveShare

Types

type EncToShareProtocol 

type EncToShareProtocol struct {
	multiparty.KeySwitchProtocol
	// contains filtered or unexported fields
}

EncToShareProtocol is the structure storing the parameters and temporary buffers required by the encryption-to-shares protocol.

func NewEncToShareProtocol 

func NewEncToShareProtocol(params bgv.Parameters, noiseFlooding ring.DistributionParameters) (EncToShareProtocol, error)

NewEncToShareProtocol creates a new EncToShareProtocol struct from the passed bgv.Parameters.

func (EncToShareProtocol) AllocateShare 

func (e2s EncToShareProtocol) AllocateShare(level int) (share multiparty.KeySwitchShare)

AllocateShare allocates a share of the EncToShare protocol

func (EncToShareProtocol) GenShare 

func (e2s EncToShareProtocol) GenShare(sk *rlwe.SecretKey, ct *rlwe.Ciphertext, secretShareOut *multiparty.AdditiveShare, publicShareOut *multiparty.KeySwitchShare)

GenShare generates a party's share in the encryption-to-shares protocol. This share consist in the additive secret-share of the party which is written in secretShareOut and in the public masked-decryption share written in publicShareOut. ct1 is degree 1 element of a rlwe.Ciphertext, i.e. rlwe.Ciphertext.Value[1].

func (EncToShareProtocol) GetShare 

func (e2s EncToShareProtocol) GetShare(secretShare *multiparty.AdditiveShare, aggregatePublicShare multiparty.KeySwitchShare, ct *rlwe.Ciphertext, secretShareOut *multiparty.AdditiveShare)

GetShare is the final step of the encryption-to-share protocol. It performs the masked decryption of the target ciphertext followed by a the removal of the caller's secretShare as generated in the EncToShareProtocol.GenShare method. If the caller is not secret-key-share holder (i.e., didn't generate a decryption share), secretShare can be set to nil. Therefore, in order to obtain an additive sharing of the message, only one party should call this method, and the other parties should use the secretShareOut output of the GenShare method.

func (EncToShareProtocol) ShallowCopy 

func (e2s EncToShareProtocol) ShallowCopy() EncToShareProtocol

ShallowCopy creates a shallow copy of EncToShareProtocol in which all the read-only data-structures are shared with the receiver and the temporary buffers are reallocated. The receiver and the returned EncToShareProtocol can be used concurrently.

type MaskedTransformFunc 

type MaskedTransformFunc struct {
	Decode bool
	Func   func(coeffs []uint64)
	Encode bool
}

MaskedTransformFunc is a struct containing a user-defined in-place function that can be applied to masked integer plaintexts, as a part of the Masked Transform Protocol. The function is called with a vector of integers modulo bgv.Parameters.PlaintextModulus() of size bgv.Parameters.N() as input, and must write its output on the same buffer. Transform can be the identity.

  • Decode: if true, then the masked BFV plaintext will be decoded before applying Transform.
  • Recode: if true, then the masked BFV plaintext will be recoded after applying Transform.

Decode (true/false) -> Transform -> Recode (true/false).

type MaskedTransformProtocol 

type MaskedTransformProtocol struct {
	// contains filtered or unexported fields
}

MaskedTransformProtocol is a struct storing the parameters for the MaskedTransformProtocol protocol.

func NewMaskedTransformProtocol 

func NewMaskedTransformProtocol(paramsIn, paramsOut bgv.Parameters, noiseFlooding ring.DistributionParameters) (rfp MaskedTransformProtocol, err error)

NewMaskedTransformProtocol creates a new instance of the PermuteProtocol.

func (MaskedTransformProtocol) AggregateShares 

func (rfp MaskedTransformProtocol) AggregateShares(share1, share2 multiparty.RefreshShare, shareOut *multiparty.RefreshShare) (err error)

AggregateShares sums share1 and share2 on shareOut.

func (MaskedTransformProtocol) AllocateShare 

func (rfp MaskedTransformProtocol) AllocateShare(levelDecrypt, levelRecrypt int) multiparty.RefreshShare

AllocateShare allocates the shares of the PermuteProtocol

func (MaskedTransformProtocol) GenShare 

func (rfp MaskedTransformProtocol) GenShare(skIn, skOut *rlwe.SecretKey, ct *rlwe.Ciphertext, crs multiparty.KeySwitchCRP, transform *MaskedTransformFunc, shareOut *multiparty.RefreshShare) (err error)

GenShare generates the shares of the PermuteProtocol. ct1 is the degree 1 element of a rlwe.Ciphertext, i.e. rlwe.Ciphertext.Value[1].

func (*MaskedTransformProtocol) SampleCRP 

func (rfp *MaskedTransformProtocol) SampleCRP(level int, crs sampling.PRNG) multiparty.KeySwitchCRP

SampleCRP samples a common random polynomial to be used in the Masked-Transform protocol from the provided common reference string.

func (MaskedTransformProtocol) ShallowCopy 

func (rfp MaskedTransformProtocol) ShallowCopy() MaskedTransformProtocol

ShallowCopy creates a shallow copy of MaskedTransformProtocol in which all the read-only data-structures are shared with the receiver and the temporary buffers are reallocated. The receiver and the returned MaskedTransformProtocol can be used concurrently.

func (MaskedTransformProtocol) Transform 

func (rfp MaskedTransformProtocol) Transform(ct *rlwe.Ciphertext, transform *MaskedTransformFunc, crs multiparty.KeySwitchCRP, share multiparty.RefreshShare, ciphertextOut *rlwe.Ciphertext) (err error)

Transform applies Decrypt, Recode and Recrypt on the input ciphertext.

type RefreshProtocol 

type RefreshProtocol struct {
	MaskedTransformProtocol
}

RefreshProtocol is a struct storing the relevant parameters for the Refresh protocol.

func NewRefreshProtocol 

func NewRefreshProtocol(params bgv.Parameters, noiseFlooding ring.DistributionParameters) (rfp RefreshProtocol, err error)

NewRefreshProtocol creates a new Refresh protocol instance.

func (RefreshProtocol) AggregateShares 

func (rfp RefreshProtocol) AggregateShares(share1, share2 multiparty.RefreshShare, shareOut *multiparty.RefreshShare) (err error)

AggregateShares aggregates two parties' shares in the Refresh protocol.

func (RefreshProtocol) AllocateShare 

func (rfp RefreshProtocol) AllocateShare(inputLevel, outputLevel int) multiparty.RefreshShare

AllocateShare allocates the shares of the PermuteProtocol

func (RefreshProtocol) Finalize 

func (rfp RefreshProtocol) Finalize(ctIn *rlwe.Ciphertext, crp multiparty.KeySwitchCRP, share multiparty.RefreshShare, opOut *rlwe.Ciphertext) (err error)

Finalize applies Decrypt, Recode and Recrypt on the input ciphertext.

func (RefreshProtocol) GenShare 

func (rfp RefreshProtocol) GenShare(sk *rlwe.SecretKey, ct *rlwe.Ciphertext, crp multiparty.KeySwitchCRP, shareOut *multiparty.RefreshShare) (err error)

GenShare generates a share for the Refresh protocol. ct1 is degree 1 element of a rlwe.Ciphertext, i.e. rlwe.Ciphertext.Value[1].

func (*RefreshProtocol) ShallowCopy 

func (rfp *RefreshProtocol) ShallowCopy() RefreshProtocol

ShallowCopy creates a shallow copy of RefreshProtocol in which all the read-only data-structures are shared with the receiver and the temporary buffers are reallocated. The receiver and the returned RefreshProtocol can be used concurrently.

type ShareToEncProtocol 

type ShareToEncProtocol struct {
	multiparty.KeySwitchProtocol
	// contains filtered or unexported fields
}

ShareToEncProtocol is the structure storing the parameters and temporary buffers required by the shares-to-encryption protocol.

func NewShareToEncProtocol 

func NewShareToEncProtocol(params bgv.Parameters, noiseFlooding ring.DistributionParameters) (ShareToEncProtocol, error)

NewShareToEncProtocol creates a new ShareToEncProtocol struct from the passed integer parameters.

func (ShareToEncProtocol) AllocateShare 

func (s2e ShareToEncProtocol) AllocateShare(level int) (share multiparty.KeySwitchShare)

AllocateShare allocates a share of the ShareToEnc protocol

func (ShareToEncProtocol) GenShare 

func (s2e ShareToEncProtocol) GenShare(sk *rlwe.SecretKey, crp multiparty.KeySwitchCRP, secretShare multiparty.AdditiveShare, c0ShareOut *multiparty.KeySwitchShare) (err error)

GenShare generates a party's in the shares-to-encryption protocol given the party's secret-key share `sk`, a common polynomial sampled from the CRS `crp` and the party's secret share of the message.

func (ShareToEncProtocol) GetEncryption 

func (s2e ShareToEncProtocol) GetEncryption(c0Agg multiparty.KeySwitchShare, crp multiparty.KeySwitchCRP, opOut *rlwe.Ciphertext) (err error)

GetEncryption computes the final encryption of the secret-shared message when provided with the aggregation `c0Agg` of the parties' shares in the protocol and with the common, CRS-sampled polynomial `crp`.

func (ShareToEncProtocol) ShallowCopy 

func (s2e ShareToEncProtocol) ShallowCopy() ShareToEncProtocol

ShallowCopy creates a shallow copy of ShareToEncProtocol in which all the read-only data-structures are shared with the receiver and the temporary buffers are reallocated. The receiver and the returned ShareToEncProtocol can be used concurrently.

Source Files

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