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/*
* This file is part of GNU Taler
* (C) 2020 Taler Systems S.A.
*
* GNU Taler is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 3, or (at your option) any later version.
*
* GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
package net.taler.lib.crypto
import com.goterl.lazycode.lazysodium.LazySodiumJava
import com.goterl.lazycode.lazysodium.SodiumJava
import com.goterl.lazycode.lazysodium.interfaces.Hash
import com.goterl.lazycode.lazysodium.interfaces.Hash.State512
import com.goterl.lazycode.lazysodium.interfaces.KeyExchange
import com.goterl.lazycode.lazysodium.interfaces.Sign
import com.goterl.lazycode.lazysodium.utils.Key
internal actual object CryptoFactory {
internal actual fun getCrypto(): Crypto = CryptoJvmImpl
}
internal object CryptoJvmImpl : CryptoImpl() {
private val sodium = LazySodiumJava(SodiumJava())
override fun sha256(input: ByteArray): ByteArray {
val output = ByteArray(Hash.SHA256_BYTES)
sodium.cryptoHashSha256(output, input, input.size.toLong())
return output
}
override fun sha512(input: ByteArray): ByteArray {
val output = ByteArray(Hash.SHA512_BYTES)
sodium.cryptoHashSha512(output, input, input.size.toLong())
return output
}
override fun getHashSha512State(): HashSha512State {
return JvmHashSha512State()
}
override fun getRandomBytes(num: Int): ByteArray {
return sodium.randomBytesBuf(num)
}
override fun eddsaGetPublic(eddsaPrivateKey: ByteArray): ByteArray {
return sodium.cryptoSignSeedKeypair(eddsaPrivateKey).publicKey.asBytes
}
override fun ecdheGetPublic(ecdhePrivateKey: ByteArray): ByteArray {
return sodium.cryptoScalarMultBase(Key.fromBytes(ecdhePrivateKey)).asBytes
}
override fun createEddsaKeyPair(): EddsaKeyPair {
val privateKey = sodium.randomBytesBuf(KeyExchange.SEEDBYTES)
val publicKey = eddsaGetPublic(privateKey)
return EddsaKeyPair(privateKey, publicKey)
}
override fun createEcdheKeyPair(): EcdheKeyPair {
val privateKey = sodium.randomBytesBuf(KeyExchange.SEEDBYTES)
val publicKey = ecdheGetPublic(privateKey)
return EcdheKeyPair(privateKey, publicKey)
}
override fun eddsaSign(msg: ByteArray, eddsaPrivateKey: ByteArray): ByteArray {
val privateKey = sodium.cryptoSignSeedKeypair(eddsaPrivateKey).secretKey.asBytes
val signatureBytes = ByteArray(Sign.BYTES)
sodium.cryptoSignDetached(signatureBytes, msg, msg.size.toLong(), privateKey)
return signatureBytes
}
override fun eddsaVerify(msg: ByteArray, sig: ByteArray, eddsaPub: ByteArray): Boolean {
return sodium.cryptoSignVerifyDetached(sig, msg, msg.size, eddsaPub)
}
override fun keyExchangeEddsaEcdhe(eddsaPrivateKey: ByteArray, ecdhePublicKey: ByteArray): ByteArray {
val ph = sha512(eddsaPrivateKey)
val a = ph.copyOfRange(0, 32)
val x = sodium.cryptoScalarMult(Key.fromBytes(a), Key.fromBytes(ecdhePublicKey)).asBytes
return sha512(x)
}
override fun keyExchangeEcdheEddsa(ecdhePrivateKey: ByteArray, eddsaPublicKey: ByteArray): ByteArray {
val curve25519Pub = ByteArray(KeyExchange.PUBLICKEYBYTES)
sodium.convertPublicKeyEd25519ToCurve25519(curve25519Pub, eddsaPublicKey)
val x = sodium.cryptoScalarMult(Key.fromBytes(ecdhePrivateKey), Key.fromBytes(curve25519Pub)).asBytes
return sha512(x)
}
override fun rsaBlind(hm: ByteArray, bks: ByteArray, rsaPubEnc: ByteArray): ByteArray {
return RsaBlinding.rsaBlind(hm, bks, rsaPubEnc)
}
override fun rsaUnblind(sig: ByteArray, rsaPubEnc: ByteArray, bks: ByteArray): ByteArray {
return RsaBlinding.rsaUnblind(sig, rsaPubEnc, bks)
}
override fun rsaVerify(hm: ByteArray, rsaSig: ByteArray, rsaPubEnc: ByteArray): Boolean {
return RsaBlinding.rsaVerify(hm, rsaSig, rsaPubEnc)
}
private class JvmHashSha512State : HashSha512State {
private val state = State512()
init {
check(sodium.cryptoHashSha512Init(state)) { "Error doing cryptoHashSha512Init" }
}
override fun update(data: ByteArray): HashSha512State {
sodium.cryptoHashSha512Update(state, data, data.size.toLong())
return this
}
override fun final(): ByteArray {
val output = ByteArray(Hash.SHA512_BYTES)
sodium.cryptoHashSha512Final(state, output)
return output
}
}
}
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