func CryptoScalarmultBase(n []byte) ([]byte, int) {
support.CheckSize(n, CryptoScalarmultScalarBytes(), "secret key")
q := make([]byte, CryptoScalarmultBytes())
var exit C.int
exit = C.crypto_scalarmult_base(
(*C.uchar)(&q[0]),
(*C.uchar)(&n[0]))
return q, int(exit)
}
// get public key from secret key
func GetBoxPubkey(sk []byte) []byte {
sk_len := C.crypto_box_seedbytes()
if C.size_t(len(sk)) != sk_len {
return nil
}
pk_len := C.crypto_box_publickeybytes()
pkbuff := malloc(pk_len)
defer pkbuff.Free()
skbuff := NewBuffer(sk)
defer skbuff.Free()
// compute the public key
C.crypto_scalarmult_base(pkbuff.uchar(), skbuff.uchar())
return pkbuff.Bytes()
}
func ScalarMultBase(pkOut []byte, skIn []byte) int {
checkSize(pkOut, BoxPublicKeyBytes(), "public key")
checkSize(skIn, BoxSecretKeyBytes(), "secret key")
return int(C.crypto_scalarmult_base((*C.uchar)(&pkOut[0]), (*C.uchar)(&skIn[0])))
}
func (priv ECDHPrivate) PublicKey() ECDHPublic {
toret := make([]byte, ECDHKeyLength)
C.crypto_scalarmult_base((*C.uchar)(&toret[0]),
(*C.uchar)(&priv[0]))
return toret
}