extra25519

func IsEdLowOrder ¶

func IsEdLowOrder(ge []byte) bool

IsLowOrder checks if the passed group element is of low order. Algorithm translated from the same source as the blacklist (see above).

func PrivateKeyToCurve25519 ¶

func PrivateKeyToCurve25519(privateKey ed25519.PrivateKey) []byte

PrivateKeyToCurve25519 converts an ed25519 private key into a corresponding curve25519 private key such that the resulting curve25519 public key will equal the result from PublicKeyToCurve25519.

returns a 64-byte curve25519 scalar

func PublicKeyToCurve25519 ¶

func PublicKeyToCurve25519(edBytes ed25519.PublicKey) ([]byte, bool)

PublicKeyToCurve25519 converts an Ed25519 public key into the curve25519 public key that would be generated from the same private key.

returns a 32-byte curve25519 point and true if valid. returns nil, false if not valid some ed25519 public keys cannot / should not be converted to curve25519.