signData for Java/Kotlin

[malenalbc]

I'm using 2.5.3 for signing a forge result with Tezos as part of the common flow for transacting. The forge result comes as an hexadecimal string of variable length. Is there some way to sign it with my HDWallet private key directly?

Reviewing the AnySigner.java class my options are three methods:

sign(Message input, CoinType coin, Parser<T> parser)
nativeSign(byte[] data, int coin)
signJSON(String json, byte[] key, int coin)

The first option would be my way to go, but Tezos.SigningInput only accepts a privateKey and an operationList. Second one doesn't seem to use the private key anywhere and the third fails with an invalid_argument error.

I see the Signer class has a signData method that does exactly what I'd need. Is there any way to call it either directly or indirectly from Java/Kotlin? Thanks!

[hewigovens]

I think class PrivateKey can help you, just construct the data and pass it to sign method; to get the private key from HDWallet, call getKeyForCoin