frostfs-sdk-go/util/signature/data.go

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package signature
import (
"crypto/ecdsa"
"errors"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neofs-sdk-go/signature"
)
type DataSource interface {
ReadSignedData([]byte) ([]byte, error)
SignedDataSize() int
}
type DataWithSignature interface {
DataSource
GetSignature() *signature.Signature
SetSignature(*signature.Signature)
}
type SignOption func(*cfg)
const (
// PrivateKeyCompressedSize is constant with compressed size of private key (SK).
// D coordinate stored, recover PK by formula x, y = curve.ScalarBaseMul(d,bytes).
PrivateKeyCompressedSize = 32
// PublicKeyCompressedSize is constant with compressed size of public key (PK).
PublicKeyCompressedSize = 33
// PublicKeyUncompressedSize is constant with uncompressed size of public key (PK).
// First byte always should be 0x4 other 64 bytes is X and Y (32 bytes per coordinate).
// 2 * 32 + 1.
PublicKeyUncompressedSize = 65
)
var (
// ErrEmptyPrivateKey is returned when used private key is empty.
ErrEmptyPrivateKey = errors.New("empty private key")
// ErrInvalidPublicKey is returned when public key cannot be unmarshalled.
ErrInvalidPublicKey = errors.New("invalid public key")
// ErrInvalidSignature is returned if signature cannot be verified.
ErrInvalidSignature = errors.New("invalid signature")
)
func SignData(key *ecdsa.PrivateKey, src DataSource, opts ...SignOption) (res *signature.Signature, err error) {
err = signDataWithHandler(key, src, func(key, sig []byte, scheme signature.Scheme) {
res = new(signature.Signature)
res.SetKey(key)
res.SetSign(sig)
res.SetScheme(scheme)
}, opts...)
return
}
func VerifyData(dataSrc DataSource, sig *signature.Signature, opts ...SignOption) error {
return verifyDataWithSource(dataSrc, func() ([]byte, []byte, signature.Scheme) {
return sig.Key(), sig.Sign(), sig.Scheme()
}, opts...)
}
func SignDataWithHandler(key *ecdsa.PrivateKey, src DataSource, handler func(key, sig []byte)) error {
return signDataWithHandler(key, src, func(key, sig []byte, scheme signature.Scheme) {
handler(key, sig)
})
}
func signDataWithHandler(
key *ecdsa.PrivateKey,
src DataSource,
handler func(key, sig []byte, scheme signature.Scheme),
opts ...SignOption,
) error {
if key == nil {
return ErrEmptyPrivateKey
}
data, err := dataForSignature(src)
if err != nil {
return err
}
defer bytesPool.Put(&data)
cfg := getConfig(opts...)
sigData, err := sign(cfg.scheme, key, data)
if err != nil {
return err
}
handler((*keys.PublicKey)(&key.PublicKey).Bytes(), sigData, cfg.scheme)
return nil
}
func VerifyDataWithSource(dataSrc DataSource, sigSrc func() (key, sig []byte)) error {
return verifyDataWithSource(dataSrc, func() ([]byte, []byte, signature.Scheme) {
key, sign := sigSrc()
return key, sign, signature.ECDSAWithSHA512
})
}
func verifyDataWithSource(
dataSrc DataSource,
sigSrc func() (key, sig []byte, scheme signature.Scheme),
opts ...SignOption,
) error {
data, err := dataForSignature(dataSrc)
if err != nil {
return err
}
defer bytesPool.Put(&data)
cfg := getConfig(opts...)
return verify(cfg, data, sigSrc)
}