crypto

Documentation

Index

• Constants
• func Ecrecover(hash, sig []byte) ([]byte, error)
• func GetRandomBytes(len int) ([]byte, error)
• func GetRandomNonce() ([]byte, error)
• func S256() elliptic.Curve
• func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error)
• func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error)
• type LocalSigner

Constants

const (
	// NonceSize is the default NonceSize
	NonceSize = 24
)

Functions

func Ecrecover

func Ecrecover(hash, sig []byte) ([]byte, error)

func GetRandomBytes

func GetRandomBytes(len int) ([]byte, error)

GetRandomBytes returns len random looking bytes

func GetRandomNonce

func GetRandomNonce() ([]byte, error)

GetRandomNonce returns a random byte array of length NonceSize

func S256

func S256() elliptic.Curve

S256 returns an instance of the secp256k1 curve.

func SigToPub

func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error)

func Sign

func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error)

Sign calculates an ECDSA signature.

This function is susceptible to chosen plaintext attacks that can leak information about the private key that is used for signing. Callers must be aware that the given hash cannot be chosen by an adversery. Common solution is to hash any input before calculating the signature.

The produced signature is in the [R || S || V] format where V is 0 or 1.

Types

type LocalSigner

type LocalSigner interface {
	// NewSignatureHeader creates a SignatureHeader with the correct signing identity and a valid nonce
	NewSignatureHeader() (*cb.SignatureHeader, error)

	// Sign a message which should embed a signature header created by NewSignatureHeader
	Sign(message []byte) ([]byte, error)
}

LocalSigner is a temporary stub interface which will be implemented by the local MSP