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shutter: validate decryption keys based on eon info and signatures (#…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Copyright 2025 The Erigon Authors | ||
| // This file is part of Erigon. | ||
| // | ||
| // Erigon is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // Erigon is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with Erigon. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| package shutter | ||
|
|
||
| import ( | ||
| "crypto/ecdsa" | ||
| "errors" | ||
| "fmt" | ||
| "slices" | ||
|
|
||
| libcommon "github.com/erigontech/erigon-lib/common" | ||
| "github.com/erigontech/erigon-lib/common/hexutil" | ||
| "github.com/erigontech/erigon-lib/crypto" | ||
| "github.com/erigontech/erigon-lib/types/clonable" | ||
| "github.com/erigontech/erigon/cl/cltypes/solid" | ||
| merkletree "github.com/erigontech/erigon/cl/merkle_tree" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrTooManyIdentityPreimages = errors.New("too many identity preimages") | ||
| ErrIncorrectIdentityPreimageSize = errors.New("incorrect identity preimage size") | ||
| ) | ||
|
|
||
| const ( | ||
| identityPreimageSize = 52 | ||
| identityPreimagesLimit = 1024 | ||
| ) | ||
|
|
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| type IdentityPreimage [identityPreimageSize]byte | ||
|
|
||
| func (ip *IdentityPreimage) EncodingSizeSSZ() int { | ||
| return identityPreimageSize | ||
| } | ||
|
|
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| func (ip *IdentityPreimage) EncodeSSZ(dst []byte) ([]byte, error) { | ||
| return append(dst, ip[:]...), nil | ||
| } | ||
|
|
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| func (ip *IdentityPreimage) DecodeSSZ(buf []byte, _ int) error { | ||
| if len(buf) != identityPreimageSize { | ||
| return fmt.Errorf("%w: len=%d", ErrIncorrectIdentityPreimageSize, len(ip)) | ||
| } | ||
|
|
||
| var newIp IdentityPreimage | ||
| copy(newIp[:], buf) | ||
| *ip = newIp | ||
| return nil | ||
| } | ||
|
|
||
| func (ip *IdentityPreimage) Clone() clonable.Clonable { | ||
| clone := IdentityPreimage(slices.Clone(ip[:])) | ||
| return &clone | ||
| } | ||
|
|
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| func (ip *IdentityPreimage) HashSSZ() ([32]byte, error) { | ||
| return merkletree.BytesRoot(ip[:]) | ||
| } | ||
|
|
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| func (ip *IdentityPreimage) String() string { | ||
| return hexutil.Encode(ip[:]) | ||
| } | ||
|
|
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| func IdentityPreimageFromSSZ(b []byte) (*IdentityPreimage, error) { | ||
| ip := new(IdentityPreimage) | ||
| err := ip.DecodeSSZ(b, 0) | ||
| return ip, err | ||
| } | ||
|
|
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| type IdentityPreimages []*IdentityPreimage | ||
|
|
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| func (ips IdentityPreimages) ToListSSZ() *solid.ListSSZ[*IdentityPreimage] { | ||
| return solid.NewStaticListSSZFromList(ips, identityPreimagesLimit, identityPreimageSize) | ||
| } | ||
|
|
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| type DecryptionKeysSignatureData struct { | ||
| InstanceId uint64 | ||
| Eon EonIndex | ||
| Slot uint64 | ||
| TxnPointer uint64 | ||
| IdentityPreimages *solid.ListSSZ[*IdentityPreimage] | ||
| } | ||
|
|
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| func (d DecryptionKeysSignatureData) HashSSZ() ([32]byte, error) { | ||
| if err := d.Validate(); err != nil { | ||
| return [32]byte{}, err | ||
| } | ||
|
|
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| r, err := merkletree.HashTreeRoot(d.InstanceId, uint64(d.Eon), d.Slot, d.TxnPointer, d.IdentityPreimages) | ||
| if err != nil { | ||
| return [32]byte{}, fmt.Errorf("%w: slot=%d, eon=%d", err, d.Slot, d.Eon) | ||
| } | ||
|
|
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| return r, nil | ||
| } | ||
|
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| func (d DecryptionKeysSignatureData) Sign(key *ecdsa.PrivateKey) ([]byte, error) { | ||
| h, err := d.HashSSZ() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| return crypto.Sign(h[:], key) | ||
| } | ||
|
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| func (d DecryptionKeysSignatureData) Verify(signature []byte, address libcommon.Address) (bool, error) { | ||
| h, err := d.HashSSZ() | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
|
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| pubKey, err := crypto.SigToPub(h[:], signature) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
|
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| return crypto.PubkeyToAddress(*pubKey) == address, nil | ||
| } | ||
|
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| func (d DecryptionKeysSignatureData) Validate() error { | ||
| if d.IdentityPreimages.Len() > identityPreimagesLimit { | ||
| return fmt.Errorf("%w: len=%d", ErrTooManyIdentityPreimages, d.IdentityPreimages.Len()) | ||
| } | ||
|
|
||
| return nil | ||
| } |
49 changes: 49 additions & 0 deletions
49
txnprovider/shutter/decryption_keys_signature_data_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package shutter_test | ||
|
|
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| import ( | ||
| "testing" | ||
|
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| "github.com/stretchr/testify/require" | ||
|
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| libcommon "github.com/erigontech/erigon-lib/common" | ||
| "github.com/erigontech/erigon/txnprovider/shutter" | ||
| "github.com/erigontech/erigon/txnprovider/shutter/internal/testhelpers" | ||
| ) | ||
|
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| func TestIdentityPreimageEncodeDecodeSSZ(t *testing.T) { | ||
| ip := testhelpers.Uint64ToIdentityPreimage(t, 123) | ||
| buf, err := ip.EncodeSSZ(nil) | ||
| require.NoError(t, err) | ||
| ip2, err := shutter.IdentityPreimageFromSSZ(buf) | ||
| require.NoError(t, err) | ||
| require.Equal(t, ip, ip2) | ||
| } | ||
|
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| func TestIdentityPreimageDecodeSSZWithInvalidLength(t *testing.T) { | ||
| buf := make([]byte, 39) | ||
| _, err := shutter.IdentityPreimageFromSSZ(buf) | ||
| require.ErrorIs(t, err, shutter.ErrIncorrectIdentityPreimageSize) | ||
| buf = make([]byte, 64) | ||
| _, err = shutter.IdentityPreimageFromSSZ(buf) | ||
| require.ErrorIs(t, err, shutter.ErrIncorrectIdentityPreimageSize) | ||
| } | ||
|
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| func TestDecryptionKeysSignatureDataWithInvalidPreimagesLength(t *testing.T) { | ||
| ips := testhelpers.MockIdentityPreimages(t, 1025) | ||
| sigData := shutter.DecryptionKeysSignatureData{ | ||
| InstanceId: 1, | ||
| Eon: 2, | ||
| Slot: 3, | ||
| TxnPointer: 4, | ||
| IdentityPreimages: ips.ToListSSZ(), | ||
| } | ||
|
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| err := sigData.Validate() | ||
| require.ErrorIs(t, err, shutter.ErrTooManyIdentityPreimages) | ||
| _, err = sigData.HashSSZ() | ||
| require.ErrorIs(t, err, shutter.ErrTooManyIdentityPreimages) | ||
| _, err = sigData.Verify(nil, libcommon.Address{}) | ||
| require.ErrorIs(t, err, shutter.ErrTooManyIdentityPreimages) | ||
| _, err = sigData.Sign(nil) | ||
| require.ErrorIs(t, err, shutter.ErrTooManyIdentityPreimages) | ||
| } |
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