// 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()
}
// make keypair from seed
func SeedBoxKey(seed []byte) *KeyPair {
seed_len := C.crypto_box_seedbytes()
if C.size_t(len(seed)) != seed_len {
return nil
}
seedbuff := NewBuffer(seed)
defer seedbuff.Free()
pk_len := C.crypto_box_publickeybytes()
sk_len := C.crypto_box_secretkeybytes()
pkbuff := malloc(pk_len)
skbuff := malloc(sk_len)
res := C.crypto_box_seed_keypair(pkbuff.uchar(), skbuff.uchar(), seedbuff.uchar())
if res != 0 {
pkbuff.Free()
skbuff.Free()
return nil
}
return &KeyPair{pkbuff, skbuff}
}
// make keypair from seed
func SeedBoxKey(seed []byte) *KeyPair {
seed_len := C.crypto_box_seedbytes()
if C.size_t(len(seed)) != seed_len {
log.Println("nacl.SeedBoxKey() invalid seed size", len(seed))
return nil
}
seedbuff := NewBuffer(seed)
defer seedbuff.Free()
pk_len := C.crypto_box_publickeybytes()
sk_len := C.crypto_box_secretkeybytes()
pkbuff := malloc(pk_len)
skbuff := malloc(sk_len)
res := C.crypto_box_seed_keypair(pkbuff.uchar(), skbuff.uchar(), seedbuff.uchar())
if res != 0 {
pkbuff.Free()
skbuff.Free()
log.Println("nacl.SeedBoxKey cannot derive keys from seed:", res)
return nil
}
return &KeyPair{pkbuff, skbuff}
}
func BoxSeedBytes() int {
return int(C.crypto_box_seedbytes())
}