package neofsecdsa import ( "crypto/ecdsa" "crypto/elliptic" "crypto/rand" "crypto/sha512" "github.com/nspcc-dev/neo-go/pkg/crypto/keys" neofscrypto "github.com/nspcc-dev/neofs-sdk-go/crypto" ) // Signer wraps ecdsa.PrivateKey and represents signer based on ECDSA with // SHA-512 hashing. Provides neofscrypto.Signer interface. // // Instances MUST be initialized from ecdsa.PrivateKey using type conversion. type Signer ecdsa.PrivateKey // Scheme returns neofscrypto.ECDSA_SHA512. // Implements neofscrypto.Signer. func (x Signer) Scheme() neofscrypto.Scheme { return neofscrypto.ECDSA_SHA512 } // Sign signs data using ECDSA algorithm with SHA-512 hashing. // Implements neofscrypto.Signer. func (x Signer) Sign(data []byte) ([]byte, error) { h := sha512.Sum512(data) r, s, err := ecdsa.Sign(rand.Reader, (*ecdsa.PrivateKey)(&x), h[:]) if err != nil { return nil, err } return elliptic.Marshal(elliptic.P256(), r, s), nil } // Public initializes PublicKey and returns it as neofscrypto.PublicKey. // Implements neofscrypto.Signer. func (x Signer) Public() neofscrypto.PublicKey { return (*PublicKey)(&x.PublicKey) } // SignerRFC6979 wraps ecdsa.PrivateKey and represents signer based on deterministic // ECDSA with SHA-256 hashing (RFC 6979). Provides neofscrypto.Signer interface. // // Instances SHOULD be initialized from ecdsa.PrivateKey using type conversion. type SignerRFC6979 ecdsa.PrivateKey // Scheme returns neofscrypto.ECDSA_DETERMINISTIC_SHA256. // Implements neofscrypto.Signer. func (x SignerRFC6979) Scheme() neofscrypto.Scheme { return neofscrypto.ECDSA_DETERMINISTIC_SHA256 } // Sign signs data using deterministic ECDSA algorithm with SHA-256 hashing. // Implements neofscrypto.Signer. // // See also RFC 6979. func (x SignerRFC6979) Sign(data []byte) ([]byte, error) { p := keys.PrivateKey{PrivateKey: (ecdsa.PrivateKey)(x)} return p.Sign(data), nil } // Public initializes PublicKeyRFC6979 and returns it as neofscrypto.PublicKey. // Implements neofscrypto.Signer. func (x SignerRFC6979) Public() neofscrypto.PublicKey { return (*PublicKeyRFC6979)(&x.PublicKey) }