frostfs-sdk-go/util/signature/data.go
Evgenii Stratonikov d716765c1a [#150] util/signature: Simplify public interface
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2022-02-25 12:42:38 +03:00

82 lines
2.1 KiB
Go

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) (*signature.Signature, error) {
if key == nil {
return nil, ErrEmptyPrivateKey
}
data, err := dataForSignature(src)
if err != nil {
return nil, err
}
defer bytesPool.Put(&data)
cfg := getConfig(opts...)
sigData, err := sign(cfg.defaultScheme, key, data)
if err != nil {
return nil, err
}
sig := signature.New()
sig.SetKey((*keys.PublicKey)(&key.PublicKey).Bytes())
sig.SetSign(sigData)
sig.SetScheme(cfg.defaultScheme)
return sig, nil
}
func VerifyData(dataSrc DataSource, sig *signature.Signature, opts ...SignOption) error {
data, err := dataForSignature(dataSrc)
if err != nil {
return err
}
defer bytesPool.Put(&data)
cfg := getConfig(opts...)
return verify(cfg, data, sig)
}