123 lines
3.0 KiB
Go
123 lines
3.0 KiB
Go
package signature
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neofs-sdk-go/signature"
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)
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type DataSource interface {
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ReadSignedData([]byte) ([]byte, error)
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SignedDataSize() int
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}
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type DataWithSignature interface {
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DataSource
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GetSignature() *signature.Signature
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SetSignature(*signature.Signature)
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}
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type SignOption func(*cfg)
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type KeySignatureHandler func(*signature.Signature)
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type KeySignatureSource func() *signature.Signature
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const (
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// PrivateKeyCompressedSize is constant with compressed size of private key (SK).
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// D coordinate stored, recover PK by formula x, y = curve.ScalarBaseMul(d,bytes).
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PrivateKeyCompressedSize = 32
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// PublicKeyCompressedSize is constant with compressed size of public key (PK).
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PublicKeyCompressedSize = 33
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// PublicKeyUncompressedSize is constant with uncompressed size of public key (PK).
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// First byte always should be 0x4 other 64 bytes is X and Y (32 bytes per coordinate).
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// 2 * 32 + 1.
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PublicKeyUncompressedSize = 65
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)
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var (
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// ErrEmptyPrivateKey is returned when used private key is empty.
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ErrEmptyPrivateKey = errors.New("empty private key")
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// ErrInvalidPublicKey is returned when public key cannot be unmarshalled.
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ErrInvalidPublicKey = errors.New("invalid public key")
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// ErrInvalidSignature is returned if signature cannot be verified.
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ErrInvalidSignature = errors.New("invalid signature")
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)
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func SignDataWithHandler(key *ecdsa.PrivateKey, src DataSource, handler KeySignatureHandler, opts ...SignOption) error {
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if key == nil {
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return ErrEmptyPrivateKey
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}
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data, err := dataForSignature(src)
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if err != nil {
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return err
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}
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defer bytesPool.Put(&data)
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cfg := getConfig(opts...)
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sigData, err := sign(cfg.defaultScheme, key, data)
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if err != nil {
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return err
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}
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sig := signature.New()
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sig.SetKey((*keys.PublicKey)(&key.PublicKey).Bytes())
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sig.SetSign(sigData)
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sig.SetScheme(cfg.defaultScheme)
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handler(sig)
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return nil
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}
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func VerifyDataWithSource(dataSrc DataSource, sigSrc KeySignatureSource, opts ...SignOption) error {
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data, err := dataForSignature(dataSrc)
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if err != nil {
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return err
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}
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defer bytesPool.Put(&data)
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cfg := getConfig(opts...)
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sig := sigSrc()
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var pub *keys.PublicKey
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if len(sig.Key()) != 0 {
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pub, err = keys.NewPublicKeyFromBytes(sig.Key(), elliptic.P256())
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if err != nil {
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return fmt.Errorf("%w: %v", ErrInvalidPublicKey, err)
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}
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}
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scheme := sig.Scheme()
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if scheme == signature.Unspecified {
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scheme = cfg.defaultScheme
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}
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if cfg.restrictScheme != signature.Unspecified && scheme != cfg.restrictScheme {
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return fmt.Errorf("%w: unexpected signature scheme", ErrInvalidSignature)
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}
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return verify(
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scheme,
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(*ecdsa.PublicKey)(pub),
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data,
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sig.Sign(),
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)
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}
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func SignData(key *ecdsa.PrivateKey, v DataWithSignature, opts ...SignOption) error {
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return SignDataWithHandler(key, v, v.SetSignature, opts...)
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}
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func VerifyData(src DataWithSignature, opts ...SignOption) error {
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return VerifyDataWithSource(src, src.GetSignature, opts...)
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}
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