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simplifies nonce calculation

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This commit is contained in:
Sergey Chernov 2024-06-14 11:52:43 +07:00
parent 9660379891
commit 3dd1654f70
2 changed files with 9 additions and 24 deletions
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9
src/commonMain/kotlin/net/sergeych/kiloparsec/KiloL0Interface.kt
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@ -1,10 +1,6 @@
package net.sergeych.kiloparsec package net.sergeych.kiloparsec
import kotlinx.coroutines.CompletableDeferred import kotlinx.coroutines.CompletableDeferred
import net.sergeych.mp_logger.LogTag
import net.sergeych.mp_logger.Loggable
import net.sergeych.mp_logger.debug
import net.sergeych.mp_logger.info
import net.sergeych.tools.AtomicCounter import net.sergeych.tools.AtomicCounter
import net.sergeych.utools.pack import net.sergeych.utools.pack
@ -19,7 +15,10 @@ private val idCounter = AtomicCounter(0)
internal class KiloL0Interface<T>( internal class KiloL0Interface<T>(
private val clientInterface: LocalInterface<KiloScope<T>>, private val clientInterface: LocalInterface<KiloScope<T>>,
private val deferredParams: CompletableDeferred<KiloParams<T>>, private val deferredParams: CompletableDeferred<KiloParams<T>>,
) : LocalInterface<Unit>(), Loggable by LogTag("KL0:${idCounter.incrementAndGet()}") { ) : LocalInterface<Unit>() {
override var logTag: String = "KL0:${idCounter.incrementAndGet()}"
init { init {
// local interface uses the same session as a client: // local interface uses the same session as a client:
addErrorProvider(clientInterface) addErrorProvider(clientInterface)

24
src/commonMain/kotlin/net/sergeych/kiloparsec/KiloParams.kt
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@ -47,23 +47,9 @@ data class KiloParams<S>(
blake2b("token_".encodeToUByteArray() + sessionKey.sessionTag).sliceArray(0..<SymmetricKey.nonceByteLength) blake2b("token_".encodeToUByteArray() + sessionKey.sessionTag).sliceArray(0..<SymmetricKey.nonceByteLength)
} }
private inline fun encodeNonce(base: UByteArray, nonce: ULong): UByteArray { private val numericNonce = NumericNonce(token)
val result = base.copyOf()
var x = nonce
var i = 0
while (x > 0u) {
result[i] = result[i] xor (x and 0xFFu).toUByte()
x = x shr 8
i++
}
return result
}
private inline fun encodeSendNonce(nonce: ULong): UByteArray = encodeNonce(token, nonce) private val protectedOp = ProtectedOp()
private inline fun encodeReceiveNonce(nonce: ULong): UByteArray = encodeNonce(token, nonce)
private val proptectedOp = ProtectedOp()
/** /**
* Encrypt using send keys and proper nonce * Encrypt using send keys and proper nonce
@ -74,10 +60,10 @@ data class KiloParams<S>(
else else
null null
val n = proptectedOp.invoke { nonce++ } val n = protectedOp.invoke { nonce++ }
return pack( return pack(
Package(n, sessionKey.encryptWithNonce(message, encodeSendNonce(n), fill)) Package(n, sessionKey.encryptWithNonce(message, numericNonce.withULong(n), fill))
) )
} }
@ -85,7 +71,7 @@ data class KiloParams<S>(
fun decrypt(encryptedMessage: UByteArray): UByteArray = fun decrypt(encryptedMessage: UByteArray): UByteArray =
protectDecryption { protectDecryption {
val p: Package = BipackDecoder.decode(encryptedMessage.toDataSource()) val p: Package = BipackDecoder.decode(encryptedMessage.toDataSource())
sessionKey.decryptWithNonce(p.encryptedMessage, encodeReceiveNonce(p.nonce)) sessionKey.decryptWithNonce(p.encryptedMessage, numericNonce.withULong(p.nonce))
} }
} }