signature

package
v0.37.8 Latest Latest
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 Go to latest Published: Aug 27, 2024 License: AGPL-3.0 Imports: 11 Imported by: 4

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Index

Constants

View Source 
const CheckSumLen = 4

CheckSumLen is fixed to be 4 bytes

View Source 
const SigLen = crypto.SignatureLenBLSBLS12381

Variables

View Source 
var (
	ErrInvalidSignatureFormat = errors.New("signature's binary format is invalid")

	ErrInsufficientShares = errors.New("insufficient threshold signature shares")

	// ErrIncompatibleBitVectorLength indicates that the bit vector's length is different than
	// the expected length, based on the supplied node list.
	ErrIncompatibleBitVectorLength = errors.New("bit vector has incompatible length")

	// ErrIllegallyPaddedBitVector indicates that the index vector was padded with unexpected bit values.
	ErrIllegallyPaddedBitVector = errors.New("index vector padded with unexpected bit values")

	// ErrInvalidChecksum indicates that the index vector's checksum is invalid
	ErrInvalidChecksum = errors.New("index vector's checksum is invalid")

	// ErrIdentityPublicKey indicates that the signer's public keys add up to the BLS identity public key.
	// Any signature would fail the cryptographic verification if verified against the
	// the identity public key. This case can only happen if public keys were forged to sum up to
	// an identity public key. If private keys are sampled uniformly at random, there is vanishing
	// probability of generating the aggregated identity public key. However, (colluding) byzantine
	// signers could force the generation of private keys that result in the identity aggregated key.
	ErrIdentityPublicKey = errors.New("aggregated public key is identity and aggregated signature is invalid")
)
View Source 
var (

	// RandomBeaconTag is used for threshold signatures in the random beacon
	RandomBeaconTag = tag("Random_Beacon")
	// ConsensusVoteTag is used for Consensus Hotstuff votes
	ConsensusVoteTag = tag("Consensus_Vote")
	// CollectorVoteTag is used for Collection Hotstuff votes
	CollectorVoteTag = tag("Collector_Vote")
	// ConsensusTimeoutTag is used for Consensus Active Pacemaker timeouts
	ConsensusTimeoutTag = tag("Consensus_Timeout")
	// CollectorTimeoutTag is used for Collector Active Pacemaker timeouts
	CollectorTimeoutTag = tag("Collector_Timeout")
	// ExecutionReceiptTag is used for execution receipts
	ExecutionReceiptTag = tag("Execution_Receipt")
	// ResultApprovalTag is used for result approvals
	ResultApprovalTag = tag("Result_Approval")
	// SPOCKTag is used to generate SPoCK proofs
	SPOCKTag = tag("SPoCK")
	// DKGMessageTag is used for DKG messages
	DKGMessageTag = tag("DKG_Message")
)

Functions

func CheckSumFromIdentities added in v0.26.1 

func CheckSumFromIdentities(identities []flow.Identifier) [CheckSumLen]byte

CheckSumFromIdentities returns checksum for the given identities

func CompareAndExtract added in v0.26.1 

func CompareAndExtract(canonicalList []flow.Identifier, checkSumPrefixedSignerIndices []byte) ([]byte, error)

CompareAndExtract reads the checksum from the given `checkSumPrefixedSignerIndices` and compares it with the checksum of the given identifier list. It returns the signer indices if the checksum matches. Inputs:

  • canonicalList is the canonical list from decoder's view
  • checkSumPrefixedSignerIndices is the signer indices created by the encoder, and prefixed with the checksum of the canonical list from encoder's view.

Expected error during normal operations:

  • ErrInvalidChecksum if the input is shorter than the expected checksum contained therein

func DecodeDoubleSig added in v0.26.1 

func DecodeDoubleSig(sigData []byte) (crypto.Signature, crypto.Signature, error)

TODO: to be removed in V3, replace by packer's unpack method DecodeDoubleSig decodes the signature data into a staking signature and an optional random beacon signature. The decoding assumes BLS with BLS12-381 is used. Cryptographic validity of signatures is _not_ checked. Decomposition of the sigData is purely done based on length. It returns:

  • staking signature, random beacon signature, nil: if sigData is twice the size of a BLS signature bytes long, we use the leading half as staking signature and the tailing half random beacon sig
  • staking signature, nil, nil: if sigData is the size of a BLS signature, we interpret sigData entirely as staking signature
  • nil, nil, ErrInvalidSignatureFormat if the sig type is invalid (covers nil or empty sigData)

func DecodeSigTypeToStakingAndBeaconSigners added in v0.26.1 

func DecodeSigTypeToStakingAndBeaconSigners(
	signers flow.IdentitySkeletonList,
	sigType []byte,
) (flow.IdentitySkeletonList, flow.IdentitySkeletonList, error)

DecodeSigTypeToStakingAndBeaconSigners decodes the bit-vector `sigType` to the set of staking signer identities (`stakingSigners`) and the set of beacon signer identities (`beaconSigners`). Prerequisite:

  • The input `signers` must be the set of signers in their canonical order.

Expected Error returns during normal operations:

  • signature.IsInvalidSigTypesError if the given `sigType` does not encode a valid sequence of signature types

func DecodeSignerIndicesToIdentifiers added in v0.26.1 

func DecodeSignerIndicesToIdentifiers(
	canonicalIdentifiers flow.IdentifierList,
	prefixed []byte,
) (flow.IdentifierList, error)

DecodeSignerIndicesToIdentifiers decodes the given compacted bit vector into signerIDs Prerequisite:

  • The input `canonicalIdentifiers` must exhaustively list the set of authorized signers in their canonical order.

Expected Error returns during normal operations: * signature.InvalidSignerIndicesError if the given index vector `prefixed` does not encode a valid set of signers

func DecodeSignerIndicesToIdentities added in v0.26.1 

func DecodeSignerIndicesToIdentities(
	canonicalIdentities flow.IdentitySkeletonList,
	prefixed []byte,
) (flow.IdentitySkeletonList, error)

DecodeSignerIndicesToIdentities decodes the given compacted bit vector into node Identities. Prerequisite:

  • The input `canonicalIdentifiers` must exhaustively list the set of authorized signers in their canonical order.

The returned list of decoded identities is in canonical order.

Expected Error returns during normal operations: * signature.InvalidSignerIndicesError if the given index vector `prefixed` does not encode a valid set of signers

func DecodeSingleSig added in v0.26.1 

func DecodeSingleSig(sigData []byte) (encoding.SigType, crypto.Signature, error)

DecodeSingleSig decodes the signature data into a cryptographic signature and a type as required by the consensus design. Cryptographic validity of signatures is _not_ checked. It returns:

  • 0, nil, ErrInvalidSignatureFormat if the sig type is invalid (covers nil or empty sigData)
  • sigType, signature, nil if the sig type is valid and the decoding is done successfully.

func EncodeDoubleSig added in v0.26.1 

func EncodeDoubleSig(stakingSig crypto.Signature, beaconSig crypto.Signature) []byte

TODO: to be removed in V3, replace by packer's pack method EncodeDoubleSig encodes both the staking signature and random beacon signature into one sigData.

func EncodeIdentities added in v0.26.1 

func EncodeIdentities(identities []flow.Identifier) []byte

EncodeIdentities will concatenation all the identities into bytes

func EncodeSignerToIndicesAndSigType added in v0.26.1 

func EncodeSignerToIndicesAndSigType(
	canonicalIdentifiers flow.IdentifierList,
	stakingSigners flow.IdentifierList,
	beaconSigners flow.IdentifierList,
) (signerIndices []byte, sigTypes []byte, err error)

EncodeSignerToIndicesAndSigType encodes the given stakingSigners and beaconSigners into bit vectors for signer indices and sig types. PREREQUISITES:

  • The input `canonicalIdentifiers` must exhaustively list the set of authorized signers in their canonical order.
  • The inputs `stakingSigners` and `beaconSigners` are treated as sets, i.e. they should not contain any duplicates.
  • A node can be listed in either `stakingSigners` or `beaconSigners`. A node appearing in both lists constitutes an illegal input.
  • `stakingSigners` must be a subset of `canonicalIdentifiers`
  • `beaconSigners` must be a subset of `canonicalIdentifiers`

RETURN VALUES:

  • `signerIndices` is a bit vector. Let signerIndices[i] denote the ith bit of `signerIndices`.

    . ┌ 1 if and only if canonicalIdentifiers[i] is in `stakingSigners` or `beaconSigners` . signerIndices[i] = └ 0 otherwise

    Let `n` be the length of `canonicalIdentifiers`. `signerIndices` contains at least `n` bits, though, we right-pad it with tailing zeros to full bytes.

  • `sigTypes` is a bit vector. Let sigTypes[i] denote the ith bit of `sigTypes` . ┌ 1 if and only if the ith signer is in `beaconSigners` . sigTypes[i] = └ 0 if and only if the ith signer is in `stakingSigners` (Per prerequisite, we require that no signer is listed in both `beaconSigners` and `stakingSigners`)

Example: As an example consider the case where we have a committee C of 10 nodes in canonical oder 

C = [A,B,C,D,E,F,G,H,I,J]

where nodes [B,F] are stakingSigners and beaconSigners are [C,E,G,I,J].

  1. First return parameter: `signerIndices` - We start with a bit vector v that has |C| number of bits - If a node contributed either as staking signer or beacon signer, we set the respective bit to 1: . [A,B,C,D,E,F,G,H,I,J] . ↓ ↓ ↓ ↓ ↓ ↓ ↓ . 0,1,1,0,1,1,1,0,1,1 - Lastly, right-pad the resulting bit vector with 0 to full bytes. We have 10 committee members, so we pad to 2 bytes: . 01101110 11000000
  2. second return parameter: `sigTypes` - Here, we restrict our focus on the signers, which we encoded in the previous step. In our example, nodes [B,C,E,F,G,I,J] signed in canonical order. This is exactly the same order, as we have represented the signer in the last step. - For these 5 nodes in their canonical order, we encode each node's signature type as . bit-value 1: node was in beaconSigners . bit-value 0: node was in stakingSigners This results in the bit vector . [B,C,E,F,G,I,J] . ↓ ↓ ↓ ↓ ↓ ↓ ↓ . 0,1,0,1,1,1,1 - Again, we right-pad with zeros to full bytes, As we only had 7 signers, the sigType slice is 1byte long . 01011110

the signer indices is prefixed with a checksum of the canonicalIdentifiers, which can be used by the decoder to verify if the decoder is using the same canonicalIdentifiers as the encoder to decode the signer indices.

ERROR RETURNS During normal operations, no error returns are expected. This is because encoding signer sets is generally part of the node's internal work to generate messages. Hence, the inputs to this method come from other trusted components within the node. Therefore, any illegal input is treated as a symptom of an internal bug.

func EncodeSignersToIndices added in v0.26.1 

func EncodeSignersToIndices(
	canonicalIdentifiers flow.IdentifierList,
	signerIDs flow.IdentifierList,
) (signerIndices []byte, err error)

EncodeSignersToIndices encodes the given signerIDs into compacted bit vector. PREREQUISITES:

  • The input `canonicalIdentifiers` must exhaustively list the set of authorized signers in their canonical order.
  • The input `signerIDs` represents a set, i.e. it should not contain any duplicates.
  • `signerIDs` must be a subset of `canonicalIdentifiers`
  • `signerIDs` can be in arbitrary order (canonical order _not required_)

RETURN VALUE:

  • `signerIndices` is a bit vector. Let signerIndices[i] denote the ith bit of `signerIndices`. . ┌ 1 if and only if canonicalIdentifiers[i] is in `signerIDs` . signerIndices[i] = └ 0 otherwise Let `n` be the length of `canonicalIdentifiers`. `signerIndices` contains at least `n` bits, though, we right-pad it with tailing zeros to full bytes.

Example: As an example consider the case where we have a committee C of 10 nodes in canonical oder 

C = [A,B,C,D,E,F,G,H,I,J]

where nodes [B,F] are stakingSigners, and beaconSigners are [C,E,G,I,J].

  1. First return parameter: QC.signerIndices - We start with a bit vector v that has |C| number of bits - If a node contributed either as staking signer or beacon signer, we set the respective bit to 1: . [A,B,C,D,E,F,G,H,I,J] . ↓ ↓ ↓ ↓ ↓ ↓ ↓ . 0,1,1,0,1,1,1,0,1,1 - Lastly, right-pad the resulting bit vector with 0 to full bytes. We have 10 committee members, so we pad to 2 bytes: . 01101110 11000000

ERROR RETURNS During normal operations, no error returns are expected. This is because encoding signer sets is generally part of the node's internal work to generate messages. Hence, the inputs to this method come from other trusted components within the node. Therefore, any illegal input is treated as a symptom of an internal bug. canonicalIdentifiers represents all identities who are eligible to sign the given resource. It excludes identities who are ineligible to sign the given resource. For example, canonicalIdentifiers in the context of a cluster consensus quorum certificate would include authorized members of the cluster and exclude ejected members of the cluster, or unejected collection nodes from a different cluster. the signer indices is prefixed with a checksum of the canonicalIdentifiers, which can be used by the decoder to verify if the decoder is using the same canonicalIdentifiers as the encoder to decode the signer indices.

func EncodeSingleSig added in v0.26.1 

func EncodeSingleSig(sigType encoding.SigType, sig crypto.Signature) []byte

EncodeSingleSig encodes a single signature into signature data as required by the consensus design.

func IsDuplicatedSignerIdxError added in v0.23.9 

func IsDuplicatedSignerIdxError(err error) bool

IsDuplicatedSignerIdxError returns whether err is an DuplicatedSignerIdxError

func IsInsufficientSignaturesError added in v0.23.9 

func IsInsufficientSignaturesError(err error) bool

IsInsufficientSignaturesError returns whether err is an InsufficientSignaturesError

func IsInvalidSigTypesError added in v0.26.2 

func IsInvalidSigTypesError(err error) bool

IsInvalidSigTypesError returns whether err is an InvalidSigTypesError

func IsInvalidSignatureIncludedError added in v0.23.9 

func IsInvalidSignatureIncludedError(err error) bool

IsInvalidSignatureIncludedError returns whether err is an InvalidSignatureIncludedError

func IsInvalidSignerIdxError added in v0.23.9 

func IsInvalidSignerIdxError(err error) bool

IsInvalidSignerIdxError returns whether err is an InvalidSignerIdxError

func IsInvalidSignerIndicesError added in v0.26.2 

func IsInvalidSignerIndicesError(err error) bool

IsInvalidSignerIndicesError returns whether err is an InvalidSignerIndicesError

func NewBLSHasher added in v0.27.0 

func NewBLSHasher(tag string) hash.Hasher

NewBLSHasher returns a hasher to be used for BLS signing and verifying in the protocol and abstracts the hasher details from the protocol logic.

The hasher returned is the the expand-message step in the BLS hash-to-curve. It uses a xof (extendable output function) based on KMAC128. It therefore has 128-bytes outputs.

func NewDuplicatedSignerIdxErrorf added in v0.23.9 

func NewDuplicatedSignerIdxErrorf(msg string, args ...interface{}) error

func NewInsufficientSignaturesErrorf added in v0.23.9 

func NewInsufficientSignaturesErrorf(msg string, args ...interface{}) error

func NewInvalidSigTypesErrorf added in v0.26.2 

func NewInvalidSigTypesErrorf(msg string, args ...interface{}) error

func NewInvalidSignatureIncludedErrorf added in v0.23.9 

func NewInvalidSignatureIncludedErrorf(msg string, args ...interface{}) error

func NewInvalidSignerIdxErrorf added in v0.23.9 

func NewInvalidSignerIdxErrorf(msg string, args ...interface{}) error

func NewInvalidSignerIndicesErrorf added in v0.26.2 

func NewInvalidSignerIndicesErrorf(msg string, args ...interface{}) error

func PrefixCheckSum added in v0.26.1 

func PrefixCheckSum(canonicalList []flow.Identifier, signrIndices []byte) []byte

PrefixCheckSum prefix the given data with the checksum of the given identifier list

func RandomBeaconThreshold added in v0.23.9 

func RandomBeaconThreshold(size int) int

RandomBeaconThreshold returns the threshold (t) to allow the largest number of malicious nodes (m) assuming the protocol requires:

  • m<=t for unforgeability
  • n-m>=t+1 for robustness

func SplitCheckSum added in v0.26.1 

func SplitCheckSum(checkSumPrefixedSignerIndices []byte) ([CheckSumLen]byte, []byte, error)

SplitCheckSum splits the given bytes into two parts: - prefixed checksum of the canonical identifier list - the signerIndices Expected error during normal operations:

  • ErrInvalidChecksum if the input is shorter than the expected checksum contained therein

Types

type DuplicatedSignerIdxError added in v0.23.9 

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

DuplicatedSignerIdxError indicates that a signature from the respective signer index was already added

func (DuplicatedSignerIdxError) Error added in v0.23.9 

func (e DuplicatedSignerIdxError) Error() string

func (DuplicatedSignerIdxError) Unwrap added in v0.23.9 

func (e DuplicatedSignerIdxError) Unwrap() error

type InsufficientSignaturesError added in v0.23.9 

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

InsufficientSignaturesError indicates that not enough signatures have been stored to complete the operation.

func (InsufficientSignaturesError) Error added in v0.23.9 

func (e InsufficientSignaturesError) Error() string

func (InsufficientSignaturesError) Unwrap added in v0.23.9 

func (e InsufficientSignaturesError) Unwrap() error

type InvalidSigTypesError added in v0.26.2 

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

InvalidSigTypesError indicates that the given data not encode valid signature types

func (InvalidSigTypesError) Error added in v0.26.2 

func (e InvalidSigTypesError) Error() string

func (InvalidSigTypesError) Unwrap added in v0.26.2 

func (e InvalidSigTypesError) Unwrap() error

type InvalidSignatureIncludedError added in v0.23.9 

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

InvalidSignatureIncludedError indicates that some signatures, included via TrustedAdd, are invalid

func (InvalidSignatureIncludedError) Error added in v0.23.9 

func (e InvalidSignatureIncludedError) Error() string

func (InvalidSignatureIncludedError) Unwrap added in v0.23.9 

func (e InvalidSignatureIncludedError) Unwrap() error

type InvalidSignerIdxError added in v0.23.9 

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

InvalidSignerIdxError indicates that the signer index is invalid

func (InvalidSignerIdxError) Error added in v0.23.9 

func (e InvalidSignerIdxError) Error() string

func (InvalidSignerIdxError) Unwrap added in v0.23.9 

func (e InvalidSignerIdxError) Unwrap() error

type InvalidSignerIndicesError added in v0.26.2 

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

InvalidSignerIndicesError indicates that a bit vector does not encode a valid set of signers

func (InvalidSignerIndicesError) Error added in v0.26.2 

func (e InvalidSignerIndicesError) Error() string

func (InvalidSignerIndicesError) Unwrap added in v0.26.2 

func (e InvalidSignerIndicesError) Unwrap() error

type PublicKeyAggregator added in v0.33.1 

type PublicKeyAggregator struct {
	sync.RWMutex // the above "latest" data only make sense in a concurrent safe model, the lock maintains the thread-safety
	// contains filtered or unexported fields
}

PublicKeyAggregator aggregates BLS public keys in an optimized manner. It uses a greedy algorithm to compute the aggregated key based on the latest computed key and the delta of keys. A caller can use a classic stateless aggregation if the optimization is not needed.

The structure is thread safe.

func NewPublicKeyAggregator added in v0.33.1 

func NewPublicKeyAggregator(publicKeys []crypto.PublicKey) (*PublicKeyAggregator, error)

NewPublicKeyAggregator creates an index-based key aggregator, for the given list of authorized signers.

The constructor errors if:

  • the input keys are empty.
  • any input public key algorithm is not BLS.

func (*PublicKeyAggregator) KeyAggregate added in v0.33.1 

func (p *PublicKeyAggregator) KeyAggregate(signers []int) (crypto.PublicKey, error)

KeyAggregate returns the aggregated public key of the input signers.

The aggregation errors if:

  • generic error if input signers is empty.
  • InvalidSignerIdxError if any signer is out of bound.
  • other generic errors are unexpected during normal operations.

type SignatureAggregatorSameMessage added in v0.23.9 

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

SignatureAggregatorSameMessage aggregates BLS signatures of the same message from different signers. The public keys and message are agreed upon upfront.

Currently, the module does not support signatures with multiplicity higher than 1. Each signer is allowed to sign at most once.

Aggregation uses BLS scheme. Mitigation against rogue attacks is done using Proof Of Possession (PoP) This module is only safe under the assumption that all proofs of possession (PoP) of the public keys are valid.

Implementation of SignatureAggregator is not thread-safe, the caller should make sure the calls are concurrent safe.

func NewSignatureAggregatorSameMessage added in v0.23.9 

func NewSignatureAggregatorSameMessage(
	message []byte,
	dsTag string,
	publicKeys []crypto.PublicKey,
) (*SignatureAggregatorSameMessage, error)

NewSignatureAggregatorSameMessage returns a new SignatureAggregatorSameMessage structure.

A new SignatureAggregatorSameMessage is needed for each set of public keys. If the key set changes, a new structure needs to be instantiated. Participants are defined by their public keys, and are indexed from 0 to n-1 where n is the length of the public key slice. The aggregator does not verify PoPs of input public keys, it assumes verification was done outside this module. The constructor errors if:

  • length of keys is zero
  • any input public key is not a BLS 12-381 key

func (*SignatureAggregatorSameMessage) Aggregate added in v0.23.9 

func (s *SignatureAggregatorSameMessage) Aggregate() ([]int, crypto.Signature, error)

Aggregate aggregates the added BLS signatures and returns the aggregated signature.

The function errors if any signature fails the deserialization. It also performs a final verification and errors if the aggregated signature is invalid. It also errors if no signatures were added. Post-check of aggregated signature is required for function safety, as `TrustedAdd` allows adding invalid signatures or signatures that yield the identity aggregate. In both failure cases, the function discards the generated aggregate and errors. The function is not thread-safe. Returns:

  • InsufficientSignaturesError if no signatures have been added yet
  • InvalidSignatureIncludedError if: -- some signature(s), included via TrustedAdd, fail to deserialize (regardless of the aggregated public key) -- Or all signatures deserialize correctly but some signature(s), included via TrustedAdd, are invalid (while aggregated public key is valid)
  • ErrIdentityPublicKey if the signer's public keys add up to the BLS identity public key. Any aggregated signature would fail the cryptographic verification if verified against the the identity public key. This case can only happen if public keys were forged to sum up to an identity public key. Under the assumption that PoPs of all keys are valid, an identity public key can only happen if all private keys (and hence their corresponding public keys) have been generated by colluding participants.

func (*SignatureAggregatorSameMessage) HasSignature added in v0.33.1 

func (s *SignatureAggregatorSameMessage) HasSignature(signer int) (bool, error)

HasSignature checks if a signer has already provided a valid signature. The function errors:

  • InvalidSignerIdxError if the signer index is out of bound

The function is not thread-safe.

func (*SignatureAggregatorSameMessage) TrustedAdd added in v0.23.9 

func (s *SignatureAggregatorSameMessage) TrustedAdd(signer int, sig crypto.Signature) error

TrustedAdd adds a signature to the internal state without verifying it.

The Aggregate function makes a sanity check on the aggregated signature and only outputs valid signatures. This would detect if TrustedAdd has added any invalid signature. The function errors:

  • InvalidSignerIdxError if the signer index is out of bound
  • DuplicatedSignerIdxError if a signature from the same signer index has already been added

The function is not thread-safe.

func (*SignatureAggregatorSameMessage) Verify added in v0.23.9 

func (s *SignatureAggregatorSameMessage) Verify(signer int, sig crypto.Signature) (bool, error)

Verify verifies the input signature under the stored message and stored key at the input index.

This function does not update the internal state. The function errors:

  • InvalidSignerIdxError if the signer index is out of bound
  • generic error for unexpected runtime failures

The function does not return an error for any invalid signature. If any error is returned, the returned bool is false. If no error is returned, the bool represents the validity of the signature. The function is not thread-safe.

func (*SignatureAggregatorSameMessage) VerifyAggregate added in v0.33.1 

func (s *SignatureAggregatorSameMessage) VerifyAggregate(signers []int, sig crypto.Signature) (bool, crypto.PublicKey, error)

VerifyAggregate verifies an input signature against the stored message and the stored keys corresponding to the input signers. The aggregated public key of input signers is returned. In particular this allows comparing the aggregated key against the identity public key. The function is not thread-safe. Possible returns:

  • (true, agg_key, nil): signature is valid
  • (false, agg_key, nil): signature is cryptographically invalid. This also includes the case where `agg_key` is equal to the identity public key (because of equivocation). If the caller needs to differentiate this case, `crypto.IsIdentityPublicKey` can be used to test the returned `agg_key`
  • (false, nil, err) with error types: -- InsufficientSignaturesError if no signer indices are given (`signers` is empty) -- InvalidSignerIdxError if some signer indices are out of bound -- generic error in case of an unexpected runtime failure

func (*SignatureAggregatorSameMessage) VerifyAndAdd added in v0.33.1 

func (s *SignatureAggregatorSameMessage) VerifyAndAdd(signer int, sig crypto.Signature) (bool, error)

VerifyAndAdd verifies the input signature under the stored message and stored key at the input index. If the verification passes, the signature is added to the internal signature state. The function errors:

  • InvalidSignerIdxError if the signer index is out of bound
  • DuplicatedSignerIdxError if a signature from the same signer index has already been added
  • generic error for unexpected runtime failures

The function does not return an error for any invalid signature. If any error is returned, the returned bool is false. If no error is returned, the bool represents the validity of the signature. The function is not thread-safe.

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