crypto

Documentation

Index

• func CheckMAC(message, messageMAC []byte, key Hash256) bool
• func ComputeMAC(key Hash256, message []byte) []byte
• func GenerateCipherStream(key, nonce []byte, numBytes int) ([]byte, error)
• func GetCurve(priv ecdsa.PrivateKey) ec.Curve
• type Hash256
  • func ComputeBlindingFactor(pubKey *ecdsa.PublicKey, secret Hash256) Hash256
  • func GenerateECDHSharedSecret(pub *ecdsa.PublicKey, priv *ecdsa.PrivateKey) Hash256

Functions

func CheckMAC

func CheckMAC(message, messageMAC []byte, key Hash256) bool

checks HMAC-SHA-256

func ComputeMAC

func ComputeMAC(key Hash256, message []byte) []byte

computes HMAC-SHA-256

func GenerateCipherStream

func GenerateCipherStream(key, nonce []byte, numBytes int) ([]byte, error)

generates cipher stream of size numBytes from a given PRG. TODO: generalize to other ciphers

func GetCurve

func GetCurve(priv ecdsa.PrivateKey) ec.Curve

Types

type Hash256

type Hash256 [sha256.Size]byte

func ComputeBlindingFactor

func ComputeBlindingFactor(pubKey *ecdsa.PublicKey, secret Hash256) Hash256

computes blinding factor used for blinding the cyclic group element at each hop. The blinding factor is computed by hashing the concatenation of the the hop's public key and the secret key derived between the sender and the hop blinding_factor := sha256(hopPubKey || sharedSecret)

func GenerateECDHSharedSecret

func GenerateECDHSharedSecret(pub *ecdsa.PublicKey, priv *ecdsa.PrivateKey) Hash256

generates shared secret using ECDH protocol in an arbitrary curve. The shared secret is the hash of the resulting x coordinate of point after scalar multiplication between the a ECDSA key pair.