82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package signature
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import (
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"crypto/ecdsa"
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"errors"
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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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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 SignData(key *ecdsa.PrivateKey, src DataSource, opts ...SignOption) (*signature.Signature, error) {
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if key == nil {
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return nil, 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 nil, 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 nil, 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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return sig, nil
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}
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func VerifyData(dataSrc DataSource, sig *signature.Signature, 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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return verify(cfg, data, sig)
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}
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