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• AesSIV.kt

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jvmMain.io.eqoty.secretk.crypto.AesSIV.kt Maven / Gradle / Ivy

package io.eqoty.secretk.crypto

import org.cryptomator.siv.SivMode

actual class AesSIV {
    private val aesSIV = SivMode()
    actual suspend fun encrypt(
        txEncryptionKey: UByteArray,
        plaintext: UByteArray,
        associatedData: UByteArray
    ): UByteArray {
        val macKey = ByteArray(txEncryptionKey.size / 2) { i -> txEncryptionKey[i].toByte() }
        val ctrKey = ByteArray(txEncryptionKey.size / 2) { i -> txEncryptionKey[txEncryptionKey.size / 2 + i].toByte() }
        return aesSIV.encrypt(ctrKey, macKey, plaintext.toByteArray(), associatedData.toByteArray()).toUByteArray()
    }

    actual suspend fun decrypt(
        txEncryptionKey: UByteArray,
        ciphertext: UByteArray,
        associatedData: UByteArray
    ): UByteArray {
        val macKey = ByteArray(txEncryptionKey.size / 2) { i -> txEncryptionKey[i].toByte() }
        val ctrKey = ByteArray(txEncryptionKey.size / 2) { i -> txEncryptionKey[txEncryptionKey.size / 2 + i].toByte() }
        return aesSIV.decrypt(ctrKey, macKey, ciphertext.toByteArray(), associatedData.toByteArray()).toUByteArray()
    }
}