crypto

Documentation

Index

• Constants
• func CompressPubkey(pubkey *ecdsa.PublicKey) []byte
• func DecompressPubkey(pubkey []byte) (*ecdsa.PublicKey, error)
• func Ecrecover(hash, sig []byte) ([]byte, error)
• func Keccak256(data ...[]byte) []byte
• func S256() elliptic.Curve
• func SHA256(data []byte) []byte
• func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error)
• func Sign(digestHash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error)
• func ValidateSignatureValues(v byte, r, s *big.Int, homestead bool) bool
• func VerifySignature(pubkey, digestHash, signature []byte) bool

Constants

const DigestLength = 32

DigestLength sets the signature digest exact length

Functions

func CompressPubkey

func CompressPubkey(pubkey *ecdsa.PublicKey) []byte

CompressPubkey encodes a public key to the 33-byte compressed format.

func DecompressPubkey

func DecompressPubkey(pubkey []byte) (*ecdsa.PublicKey, error)

DecompressPubkey parses a public key in the 33-byte compressed format.

func Ecrecover

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

Ecrecover returns the uncompressed public key that created the given signature.

func Keccak256

func Keccak256(data ...[]byte) []byte

Keccak256 use sha3 to hash data

func S256

func S256() elliptic.Curve

S256 returns an instance of the secp256k1 curve.

func SHA256

func SHA256(data []byte) []byte

SHA256 use sha256 to hash data

func SigToPub

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

SigToPub returns the public key that created the given signature.

func Sign

func Sign(digestHash []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 digest 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.

func ValidateSignatureValues

func ValidateSignatureValues(v byte, r, s *big.Int, homestead bool) bool

ValidateSignatureValues verifies whether the signature values are valid with the given chain rules. The v value is assumed to be either 0 or 1.

func VerifySignature

func VerifySignature(pubkey, digestHash, signature []byte) bool

VerifySignature checks that the given public key created signature over digest. The public key should be in compressed (33 bytes) or uncompressed (65 bytes) format. The signature should have the 64 byte [R || S] format.