eddsa

package
v0.0.2 Latest Latest
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 Go to latest Published: Mar 5, 2026 License: AGPL-3.0 Imports: 9 Imported by: 0

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Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func DecompressPublicKey added in v0.0.2 

func DecompressPublicKey(pubKey types.HexBytes) (*babyjub.PublicKey, error)

DecompressPublicKey method returns the decompressed bytes from a Iden3 babyjubjub public key.

func DecompressSignature added in v0.0.2 

func DecompressSignature(signature types.HexBytes) (*babyjub.Signature, error)

DecompressSignature method returns the decompressed bytes from a Iden3 babyjubjub signature.

func DefaultCSPIndexFn added in v0.0.2 

func DefaultCSPIndexFn(processID types.ProcessID, address common.Address, weight *types.BigInt) uint64

DefaultCSPIndexFn is the default function to compute the VoterIndex for a given process ID, address and weight. It uses the poseidon hash function to compute a deterministic index based on the inputs. It ensures that the result is in the VoterIndex range [0, params.VoterIndexMax].

Types

type BabyJubJubEdDSA added in v0.0.2 

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

BabyJubJubEdDSA struct implements the CSP interface for the BabyJubJubEdDSA over multiple curves.

func NewBabyJubJubKey added in v0.0.2 

func NewBabyJubJubKey(hashFn Hash) (*BabyJubJubEdDSA, error)

NewBabyJubJubKey creates a new random BabyJubJubEdDSA for the bn254 curve using the hash function provided. It implements the CSP interface and can be used to generate and verify proofs for voters. If something goes wrong during the key generation, it returns an error.

func NewBabyJubJubKeyFromSeed added in v0.0.2 

func NewBabyJubJubKeyFromSeed(hashFn Hash, seed []byte) (*BabyJubJubEdDSA, error)

NewBabyJubJubKeyFromSeed creates a new BabyJubJubEdDSA for the bn254 curve using the hash function provided and the provided seed. It implements the CSP interface and can be used to generate and verify proofs for voters. If something goes wrong during the key generation, it returns an error.

func (*BabyJubJubEdDSA) CensusOrigin added in v0.0.2 

func (c *BabyJubJubEdDSA) CensusOrigin() types.CensusOrigin

CensusOrigin returns the origin of the credential service providers. It returns the type of the CSP, which is EdDSA in this case.

func (*BabyJubJubEdDSA) CensusRoot added in v0.0.2 

func (c *BabyJubJubEdDSA) CensusRoot() *types.CensusRoot

CensusRoot returns the census root computed from the public key of the EdDSA instance. It uses the X and Y coordinates of the public key's point to compute the hash. If the EdDSA signer is not initialized or the public key can not be converted to censusRoot for the instance curve, it returns nil.

func (*BabyJubJubEdDSA) GenerateProof added in v0.0.2 

func (c *BabyJubJubEdDSA) GenerateProof(
	processID types.ProcessID,
	address common.Address,
	weight *types.BigInt,
) (*types.CensusProof, error)

GenerateProof generates a census proof for the given process ID and address. It signs the message composed by the process ID and address using the private key of the CredentialServiceProviders. It returns a CensusProof struct that includes the hash of the public key as the root, the public key, the signature and the signed address and process ID. It returns an error if the EdDSA signer is not initialized, the process ID or address provided are not valid, or something fails during signature process.

func (*BabyJubJubEdDSA) PublicKey added in v0.0.2 

func (c *BabyJubJubEdDSA) PublicKey() (CompressedBytes, error)

PublicKey returns the public key of the EdDSA instance. It returns the public key as a hex bytes.

func (*BabyJubJubEdDSA) SetIndexFn added in v0.0.2 

func (c *BabyJubJubEdDSA) SetIndexFn(indexFn types.CSPIndexFn)

SetIndexFn sets the index function for the BabyJubJubEdDSA instance.

func (*BabyJubJubEdDSA) VerifyProof added in v0.0.2 

func (c *BabyJubJubEdDSA) VerifyProof(proof *types.CensusProof) error

VerifyProof method verifies the proof provided for the current EdDSA curve. It also verifies that the census origin of the proof matches with the EdDSA instance one. It returns an error if the proof provided is nil, the census origins do not match or something fails during signature verification process.

type CompressedBytes added in v0.0.2 

type CompressedBytes []byte

CompressedBytes represents the compressed bytes resulting of babyjubjub compress and marshal texts from public keys and signatures.

func CompressSignature added in v0.0.2 

func CompressSignature(sig *babyjub.Signature) (CompressedBytes, error)

CompressSignature method returns the compressed bytes from a signature.

func CompressedPublicKey added in v0.0.2 

func CompressedPublicKey(pubKey *babyjub.PublicKey) (CompressedBytes, error)

CompressedPublicKey method returns the compressed bytes from Iden3 babyjubjub public key.

func (CompressedBytes) Bytes added in v0.0.2 

func (c CompressedBytes) Bytes() types.HexBytes

Bytes method returns the underlying byte slice of the CompressedBytes.

func (CompressedBytes) Decompress added in v0.0.2 

func (c CompressedBytes) Decompress() (types.HexBytes, error)

Decompress method returns the decompressed bytes from compressed bytes. It revert the process of Compress method, by converting the compressed bytes into a big int string and then into a slice of bytes.

func (CompressedBytes) SetBytes added in v0.0.2 

func (c CompressedBytes) SetBytes(b types.HexBytes) (CompressedBytes, error)

SetBytes method sets the resulting bytes of MarshalText and Compress functions from public keys and signatures of Iden3 Babyjubjub crypto.

func (CompressedBytes) SetCompressed added in v0.0.2 

func (c CompressedBytes) SetCompressed(b types.HexBytes) (CompressedBytes, error)

SetCompressed method sets the resulting bytes of MarshalText and Compress functions from public keys and signatures of Iden3 Babyjubjub crypto. These bytes are slices of bytes of big numbers decimal strings. This method convert that bytes into a real hex bytes.

type Hash added in v0.0.2 

type Hash interface {
	hash.Hash
	BigIntsSum([]*big.Int) (*big.Int, error)
}

Hash is an interface for a hash function that can be used by the BabyJubJubEdDSA. 

var DefaultHashFn Hash

DefaultHashFn is the default hash function used by the BabyJubJubEdDSA

func NewPoseidon added in v0.0.2 

func NewPoseidon() (Hash, error)

NewPoseidon returns a new Poseidon extended hash function.

type Poseidon added in v0.0.2 

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

Poseidon is a hash function based on the Poseidon hash algorithm, it wraps the iden3-crypto implementation to conform the Hash interface (hash.Hash extended with the BigIntsSum method for BigInts).

func (*Poseidon) BigIntsSum added in v0.0.2 

func (p *Poseidon) BigIntsSum(i []*big.Int) (*big.Int, error)

BigIntsSum method implements the additional method for the Hash interface that wraps the iden3-crypto Poseidon hasher for computing the Poseidon hash for a list of big integers.

func (*Poseidon) BlockSize added in v0.0.2 

func (p *Poseidon) BlockSize() int

BlockSize method implements the hash.Hash interface. It wraps the iden3-crypto Poseidon hasher BlockSize method.

func (*Poseidon) Reset added in v0.0.2 

func (p *Poseidon) Reset()

Reset method implements the hash.Hash interface. It wraps the iden3-crypto Poseidon hasher Reset method.

func (*Poseidon) Size added in v0.0.2 

func (p *Poseidon) Size() int

Size method implements the hash.Hash interface. It wraps the iden3-crypto Poseidon hasher Size method.

func (*Poseidon) Sum added in v0.0.2 

func (p *Poseidon) Sum(b []byte) []byte

Sum method implements the hash.Hash interface. It wraps the iden3-crypto Poseidon hasher Sum method.

func (*Poseidon) Write added in v0.0.2 

func (p *Poseidon) Write(b []byte) (int, error)

Write method implements the hash.Hash interface. It wraps the iden3-crypto Poseidon hasher Write method.

Source Files

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