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added objectstore-based public-key backend
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package setup | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/ChristianMct/helium/objectstore" | ||
| "github.com/ChristianMct/helium/protocols" | ||
| "github.com/ChristianMct/helium/sessions" | ||
| "github.com/tuneinsight/lattigo/v5/core/rlwe" | ||
| ) | ||
|
|
||
| type KeyBackend struct { | ||
| *objStoreResultBackend | ||
| sess *sessions.Session | ||
| } | ||
|
|
||
| func NewKeyBackend(osc objectstore.Config, sessParams sessions.Parameters) (kb *KeyBackend, err error) { | ||
| kb = new(KeyBackend) | ||
| os, err := objectstore.NewObjectStoreFromConfig(osc) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| kb.objStoreResultBackend = newObjStoreResultBackend(os) | ||
| kb.sess, err = sessions.NewSession("", sessParams, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return kb, nil | ||
| } | ||
|
|
||
| // GetCollectivePublicKey returns the collective public key for the session in ctx. | ||
| func (kb *KeyBackend) GetCollectivePublicKey(ctx context.Context) (*rlwe.PublicKey, error) { | ||
| out, err := kb.getOutput(ctx, protocols.Signature{Type: protocols.CKG}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return out.(*rlwe.PublicKey), nil | ||
| } | ||
|
|
||
| // GetGaloisKey returns the galois key for the session in ctx and the given Galois element. | ||
| func (kb *KeyBackend) GetGaloisKey(ctx context.Context, galEl uint64) (*rlwe.GaloisKey, error) { | ||
| out, err := kb.getOutput(ctx, protocols.Signature{Type: protocols.RTG, Args: map[string]string{"GalEl": fmt.Sprintf("%d", galEl)}}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return out.(*rlwe.GaloisKey), err | ||
| } | ||
|
|
||
| // GetRelinearizationKey returns the relinearization key for the session in ctx. | ||
| func (kb *KeyBackend) GetRelinearizationKey(ctx context.Context) (*rlwe.RelinearizationKey, error) { | ||
| out, err := kb.getOutput(ctx, protocols.Signature{Type: protocols.RKG}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return out.(*rlwe.RelinearizationKey), err | ||
| } | ||
|
|
||
| func (kb *KeyBackend) getOutput(ctx context.Context, sig protocols.Signature) (interface{}, error) { | ||
| pd, err := kb.GetProtocolDesc(ctx, sig) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| share := sig.Type.Share() | ||
| err = kb.GetShare(ctx, sig, share) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| aggOut := protocols.AggregationOutput{Descriptor: *pd, Share: protocols.Share{MHEShare: share, ShareMetadata: protocols.ShareMetadata{ProtocolID: pd.ID(), ProtocolType: pd.Type}}} | ||
|
|
||
| p, err := protocols.NewProtocol(*pd, kb.sess) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| in, err := kb.getProtoInput(ctx, p) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| out := protocols.AllocateOutput(sig, *kb.sess.Params.GetRLWEParameters()) // TODO cache ? | ||
| if err = p.Output(in, aggOut, out); err != nil { | ||
| return nil, err | ||
| } | ||
| return out, nil | ||
| } | ||
|
|
||
| func (kb *KeyBackend) getProtoInput(ctx context.Context, p *protocols.Protocol) (protocols.Input, error) { | ||
| switch p.Descriptor().Type { | ||
| case protocols.CKG, protocols.RTG: | ||
| return p.ReadCRP() | ||
| case protocols.RKG: | ||
| share := p.AllocateShare() | ||
| if err := kb.objStoreResultBackend.GetShare(ctx, protocols.Signature{Type: protocols.RKG1}, share); err != nil { | ||
| return nil, fmt.Errorf("could not retrieve round 1 share: %w", err) | ||
| } | ||
| return share.MHEShare, nil | ||
| default: | ||
| return nil, fmt.Errorf("unsupported protocol type %s", p.Descriptor().Type) | ||
| } | ||
| } |
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