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67 lines
1.7 KiB
67 lines
1.7 KiB
package tx
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import (
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"github.com/pkg/errors"
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crypto "github.com/tendermint/go-crypto"
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data "github.com/tendermint/go-wire/data"
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)
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// MultiSig lets us wrap arbitrary data with a go-crypto signature
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//
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// TODO: rethink how we want to integrate this with KeyStore so it makes
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// more sense (particularly the verify method)
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type MultiSig struct {
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Data data.Bytes
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Sigs []Signed
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}
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type Signed struct {
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Sig crypto.Signature
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Pubkey crypto.PubKey
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}
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var _ SigInner = &MultiSig{}
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func NewMulti(data []byte) Sig {
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return Sig{&MultiSig{Data: data}}
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}
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// SignBytes returns the original data passed into `NewSig`
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func (s *MultiSig) SignBytes() []byte {
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return s.Data
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}
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// Sign will add a signature and pubkey.
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//
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// Depending on the Signable, one may be able to call this multiple times for multisig
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// Returns error if called with invalid data or too many times
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func (s *MultiSig) Sign(pubkey crypto.PubKey, sig crypto.Signature) error {
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if pubkey.Empty() || sig.Empty() {
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return errors.New("Signature or Key missing")
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}
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// set the value once we are happy
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x := Signed{sig, pubkey}
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s.Sigs = append(s.Sigs, x)
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return nil
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}
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// Signers will return the public key(s) that signed if the signature
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// is valid, or an error if there is any issue with the signature,
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// including if there are no signatures
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func (s *MultiSig) Signers() ([]crypto.PubKey, error) {
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if len(s.Sigs) == 0 {
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return nil, errors.New("Never signed")
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}
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keys := make([]crypto.PubKey, len(s.Sigs))
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for i := range s.Sigs {
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ms := s.Sigs[i]
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if !ms.Pubkey.VerifyBytes(s.Data, ms.Sig) {
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return nil, errors.Errorf("Signature %d doesn't match (key: %X)", i, ms.Pubkey.Bytes())
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}
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keys[i] = ms.Pubkey
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}
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return keys, nil
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}
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