Documentation
¶
Index ¶
Constants ¶
const (
PubKeyBytesLen = 32
)
These constants define the lengths of serialized public keys.
const (
// SignatureSize is the size of an encoded Schnorr signature.
SignatureSize = 64
)
Variables ¶
This section is empty.
Functions ¶
func ParsePubKey ¶
ParsePubKey parses a public key for a koblitz curve from a bytestring into a btcec.Publickey, verifying that it is valid. It only supports public keys in the BIP-340 32-byte format.
func SerializePubKey ¶
func SerializePubKey(pub *btcec.PublicKey) []byte
SerializePubKey serializes a public key as specified by BIP 340. Public keys in this format are 32 bytes in length, and are assumed to have an even y coordinate.
Types ¶
type Error ¶
type Error = ecdsa_schnorr.Error
Error identifies an error related to a schnorr signature. It has full support for errors.Is and errors.As, so the caller can ascertain the specific reason for the error by checking the underlying error.
type ErrorKind ¶
type ErrorKind = ecdsa_schnorr.ErrorKind
ErrorKind identifies a kind of error. It has full support for errors.Is and errors.As, so the caller can directly check against an error kind when determining the reason for an error.
type SignOption ¶
type SignOption func(*signOptions)
SignOption is a functional option arguemnt that allows callers to modify the way we generate BIP-340 schnorr signatues.
func CustomNonce ¶
func CustomNonce(auxData [32]byte) SignOption
CustomNonce allows users to pass in a custom set of auxData that's used as input randomness to generate the nonce used during signing. Users may want to specify this custom value when using multi-signatures schemes such as Mu-Sig2. If this option isn't set, then rfc6979 will be used to generate the nonce material.
func FastSign ¶
func FastSign() SignOption
FastSign forces signing to skip the extra verification step at the end. Peformance sensitive applications may opt to use this option to speed up the signing operation.
type Signature ¶
type Signature struct {
// contains filtered or unexported fields
}
Signature is a type representing a Schnorr signature.
func NewSignature ¶
func NewSignature(r *btcec.FieldVal, s *btcec.ModNScalar) *Signature
NewSignature instantiates a new signature given some r and s values.
func ParseSignature ¶
ParseSignature parses a signature according to the BIP-340 specification and enforces the following additional restrictions specific to secp256k1:
- The r component must be in the valid range for secp256k1 field elements - The s component must be in the valid range for secp256k1 scalars
func Sign ¶
func Sign(privKey *btcec.PrivateKey, hash []byte, signOpts ...SignOption) (*Signature, error)
Sign generates an BIP-340 signature over the secp256k1 curve for the provided hash (which should be the result of hashing a larger message) using the given private key. The produced signature is deterministic (same message and same key yield the same signature) and canonical.
Note that the current signing implementation has a few remaining variable time aspects which make use of the private key and the generated nonce, which can expose the signer to constant time attacks. As a result, this function should not be used in situations where there is the possibility of someone having EM field/cache/etc access.
func (Signature) IsEqual ¶
IsEqual compares this Signature instance to the one passed, returning true if both Signatures are equivalent. A signature is equivalent to another, if they both have the same scalar value for R and S.
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