The nano-bip32-ed25519 from superdarkbit

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Can't verify signed message

Using the python implementation I try to sign a message from a derived key but when verifying it returns false.

Using the following code;

from bip32_ed25519 import *

# get HD node using secret
secret = str.encode("8f434346648f6b96df89dda901c5176b")
node = derive_chain(secret, "44'/165'" )

# generate private key
chKeys, chA, chC = private_child_key(node, 0)
print("chKeys=", chKeys[0].hex(), " ", chKeys[1].hex() )
print("chA=", chA.hex() )
print("chC=", chC.hex() )

# sign
msg = str.encode("hello")
sig = special_signing(chKeys[0], chKeys[1], chA, msg )
print("sig=", sig.hex() )


# verify
res = verify(chA, msg, sig)
print("res=", res)

This outputs the following;

chKeys= 385cc8536edbb90d4e70368ecff4f280187658fa6a07a4334827a95f9543264d   fe2d23dd11b1bda3541707262787567f1c0edda1a2d545043530d9ebd974cf00
chA= 37962ee48657afac972e3ebd71c0d4e41206d0c6dd6cbf92aef73d866b118a85
chC= 4d38e9608c63fd4db543619050ff67a883d08d54cc3938741a744c23b85d8305
sig= 4cd4d179f7fbcdc8e62755f15f665ac4eca74f2db55967b74fbb60880ae55c6fe9e1eeae1a0d0dba5b741da05052472055e252f7bacb17467810da340cdb100f
res= False

The expected output would be res= True at the end.

Would you clarify if this implementation is working?

Ignore child key when deriving child key

Hi, There is a condition "If Ai is the identity point (0, 1), discard the child." and your code implements the condition here.
https://github.com/superdarkbit/nano-bip32-ed25519/blob/master/src/js/bip32_ed25519.js#L215-L219
But I think It checks (1, 0) not (0, 1)

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