Implement AES Encryption for Voice #897
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| package dev.kord.voice.encryption | ||
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| import com.iwebpp.crypto.TweetNaclFast | ||
| import dev.kord.voice.EncryptionMode | ||
| import dev.kord.voice.encryption.strategies.LiteNonceStrategy | ||
| import dev.kord.voice.encryption.strategies.NonceStrategy | ||
| import dev.kord.voice.io.ByteArrayView | ||
| import dev.kord.voice.io.MutableByteArrayCursor | ||
| import dev.kord.voice.io.mutableCursor | ||
| import dev.kord.voice.io.view | ||
| import dev.kord.voice.udp.RTPPacket | ||
| import javax.crypto.Cipher | ||
| import javax.crypto.spec.GCMParameterSpec | ||
| import javax.crypto.spec.SecretKeySpec | ||
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| public sealed interface VoiceEncryption { | ||
| public val mode: EncryptionMode | ||
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| public val nonceLength: Int | ||
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| public val supportsDecryption: Boolean get() = true | ||
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| public fun createBox(key: ByteArray): Box | ||
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| public fun createUnbox(key: ByteArray): Unbox | ||
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| @JvmInline | ||
| public value class XSalsaPoly1305(public val nsf: NonceStrategy.Factory = LiteNonceStrategy) : VoiceEncryption { | ||
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| override val mode: EncryptionMode | ||
| get() = nsf.mode | ||
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| override val nonceLength: Int | ||
| get() = 24 | ||
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| override fun createBox(key: ByteArray): Box = object : Box { | ||
| private val codec: XSalsa20Poly1305Codec = XSalsa20Poly1305Codec(key) | ||
| private val nonceStrategy: NonceStrategy = nsf.create() | ||
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| override val overhead: Int | ||
| get() = TweetNaclFast.SecretBox.boxzerobytesLength + nsf.nonceLength | ||
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| override fun encrypt(src: ByteArray, nonce: ByteArray, dst: MutableByteArrayCursor): Boolean { | ||
| return codec.encrypt(src, 0, src.size, nonce, dst) | ||
| } | ||
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| override fun generateNonce(header: () -> ByteArrayView): ByteArrayView { | ||
| return nonceStrategy.generate(header) | ||
| } | ||
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| override fun appendNonce(nonce: ByteArrayView, dst: MutableByteArrayCursor) { | ||
| nonceStrategy.append(nonce, dst) | ||
| } | ||
| } | ||
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| override fun createUnbox(key: ByteArray): Unbox = object : Unbox { | ||
| private val codec: XSalsa20Poly1305Codec = XSalsa20Poly1305Codec(key) | ||
| private val nonceStrategy: NonceStrategy = nsf.create() | ||
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| override fun decrypt( | ||
| src: ByteArray, | ||
| srcOff: Int, | ||
| srcLen: Int, | ||
| nonce: ByteArray, | ||
| dst: MutableByteArrayCursor, | ||
| ): Boolean = codec.decrypt(src, srcOff, srcLen, nonce, dst) | ||
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| override fun getNonce(packet: RTPPacket): ByteArrayView = nonceStrategy.strip(packet) | ||
| } | ||
| } | ||
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| public data object AeadAes256Gcm : VoiceEncryption { | ||
| private const val AUTH_TAG_LEN = 16 | ||
| private const val NONCE_LEN = 4 | ||
| private const val IV_LEN = 12 | ||
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| override val mode: EncryptionMode | ||
| get() = EncryptionMode.AeadAes256Gcm | ||
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| override val nonceLength: Int | ||
| get() = 4 | ||
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| override val supportsDecryption: Boolean | ||
| get() = false | ||
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| override fun createBox(key: ByteArray): Box = object : Box { | ||
| // | ||
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| private val iv = ByteArray(IV_LEN) | ||
| private val ivCursor = iv.mutableCursor() | ||
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| // | ||
| private var nonce = 0u | ||
| private val nonceBuffer: ByteArray = ByteArray(NONCE_LEN) | ||
| private val nonceCursor = nonceBuffer.mutableCursor() | ||
| private val nonceView = nonceBuffer.view() | ||
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| // | ||
| val secretKey = SecretKeySpec(key, "AES") | ||
| val cipher = Cipher.getInstance("AES/GCM/NoPadding") | ||
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| override val overhead: Int | ||
| get() = AUTH_TAG_LEN + NONCE_LEN | ||
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| override fun encrypt(src: ByteArray, nonce: ByteArray, dst: MutableByteArrayCursor): Boolean { | ||
| iv.fill(0) | ||
| ivCursor.reset() | ||
| ivCursor.writeByteArray(nonce) | ||
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| cipher.init( | ||
| Cipher.ENCRYPT_MODE, secretKey, | ||
| GCMParameterSpec(AUTH_TAG_LEN * 8, iv, 0, IV_LEN) | ||
| ) | ||
| cipher.updateAAD(dst.data.copyOfRange(0, dst.cursor)) | ||
| dst.cursor += cipher.doFinal(src, 0, src.size, dst.data, dst.cursor) | ||
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| return true | ||
| } | ||
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| override fun appendNonce(nonce: ByteArrayView, dst: MutableByteArrayCursor) { | ||
| dst.writeByteView(nonce) | ||
| } | ||
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| override fun generateNonce(header: () -> ByteArrayView): ByteArrayView { | ||
| nonceCursor.reset() | ||
| nonceCursor.writeInt(nonce++.toInt()) | ||
| return nonceView | ||
| } | ||
| } | ||
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| override fun createUnbox(key: ByteArray): Unbox { | ||
| throw UnsupportedOperationException() | ||
| } | ||
| } | ||
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| public interface Box { | ||
| public val overhead: Int | ||
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| public fun encrypt(src: ByteArray, nonce: ByteArray, dst: MutableByteArrayCursor): Boolean | ||
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| public fun generateNonce(header: () -> ByteArrayView): ByteArrayView | ||
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| public fun appendNonce(nonce: ByteArrayView, dst: MutableByteArrayCursor) | ||
| } | ||
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| public interface Unbox { | ||
| /** | ||
| * Decrypt the packet. | ||
| */ | ||
| public fun decrypt( | ||
| src: ByteArray, | ||
| srcOff: Int, | ||
| srcLen: Int, | ||
| nonce: ByteArray, | ||
| dst: MutableByteArrayCursor, | ||
| ): Boolean | ||
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| /** | ||
| * Strip the nonce from the [RTP packet][packet]. | ||
| * | ||
| * @return the nonce. | ||
| */ | ||
| public fun getNonce(packet: RTPPacket): ByteArrayView | ||
| } | ||
| } | ||
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It might be useful to log if the user's chosen encryption method ends up not being used.
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or even throw an exception? but logging a warning is probably best.