Incorrect triple-DH implementation

[digal]

nuntius/nuntius/IREncryptionService.m

Line 183 in 6184ab8

crypto_kdf_derive_from_key(subkey, keyLength, salt, infoLabel, secret.bytes);

crypto_kdf_derive_from_key takes const unsigned char key[crypto_kdf_KEYBYTES] as a last argument, where crypto_kdf_KEYBYTES = 32. So this call only uses first 32 bytes from secret (which is 96 or 128 bytes long, when called from - [IRTripleDHService sharedKeyFromReceiverIdentityKey:receiverSignedPreKey:receiverEphemeralKey:]), turning this code into a single DH implementation

[ivRodriguezCA]

I completely abandoned this project.

Thank you so much for opening this issue 🙏🏼 I'll dedicate some time to fix this.