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package net.taler.wallet.kotlin.crypto
import net.taler.wallet.kotlin.Base32Crockford
import net.taler.wallet.kotlin.CoinRecord
import net.taler.wallet.kotlin.CoinSourceType.REFRESH
import net.taler.wallet.kotlin.crypto.Signature.Companion.WALLET_COIN_RECOUP
internal class Recoup(private val crypto: Crypto) {
/**
* Request that we send to the exchange to get a payback.
*/
data class Request(
/**
* Hashed denomination public key of the coin we want to get
* paid back.
*/
val denomPubHash: String,
/**
* Signature over the coin public key by the denomination.
*/
val denomSig: String,
/**
* Coin public key of the coin we want to refund.
*/
val coinPub: String,
/**
* Blinding key that was used during withdraw,
* used to prove that we were actually withdrawing the coin.
*/
val coinBlindKeySecret: String,
/**
* Signature made by the coin, authorizing the payback.
*/
val coinSig: String,
/**
* Was the coin refreshed (and thus the recoup should go to the old coin)?
*/
val refreshed: Boolean
)
/**
* Create and sign a message to recoup a coin.
*/
fun createRequest(coin: CoinRecord): Request {
val p = Signature.PurposeBuilder(WALLET_COIN_RECOUP)
.put(Base32Crockford.decode(coin.coinPub))
.put(Base32Crockford.decode(coin.denomPubHash))
.put(Base32Crockford.decode(coin.blindingKey))
.build()
val coinSig = crypto.eddsaSign(p, Base32Crockford.decode(coin.coinPriv))
return Request(
coinBlindKeySecret = coin.blindingKey,
coinPub = coin.coinPub,
coinSig = Base32Crockford.encode(coinSig),
denomPubHash = coin.denomPubHash,
denomSig = coin.denomSig,
refreshed = coin.coinSource === REFRESH
)
}
}
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