atoulme commented on a change in pull request #38: v5 UDP packet handling
URL: https://github.com/apache/incubator-tuweni/pull/38#discussion_r337667405
##########
File path:
devp2p/src/main/kotlin/org/apache/tuweni/devp2p/v5/encrypt/AES128GCM.kt
##########
@@ -0,0 +1,56 @@
+package org.apache.tuweni.devp2p.v5.encrypt
+
+import org.apache.tuweni.bytes.Bytes
+import java.nio.ByteBuffer
+import javax.crypto.Cipher
+import javax.crypto.spec.GCMParameterSpec
+import javax.crypto.spec.SecretKeySpec
+
+object AES128GCM {
+
+ fun encrypt(key: Bytes, nonce: Bytes, message: Bytes, data: Bytes): Bytes {
+ val result = encrypt(nonce.toArray(), key.toArray(), data.toArray(),
message.toArray())
+ return Bytes.wrap(result)
+ }
+
+ fun encrypt(key: ByteArray, nonce: ByteArray, message: ByteArray, data:
ByteArray): ByteArray {
+ val keySpec = SecretKeySpec(key, "AES")
+ val cipher = Cipher.getInstance("AES/GCM/NoPadding")
+ val parameterSpec = GCMParameterSpec(128, nonce)
+
+ cipher.init(Cipher.ENCRYPT_MODE, keySpec, parameterSpec)
+
+ cipher.updateAAD(data)
+
+ val encriptedText = Bytes.wrap(cipher.doFinal(message))
+
+ val wrappedNonce = Bytes.wrap(nonce)
+ val nonceSize = Bytes.ofUnsignedInt(nonce.size.toLong())
+ return Bytes.wrap(nonceSize, wrappedNonce, encriptedText).toArray()
+ }
+
+ fun decrypt(encryptedContent: Bytes, key: Bytes, data: Bytes): Bytes {
+ val result = decrypt(encryptedContent.toArray(), key.toArray(),
data.toArray())
+ return Bytes.wrap(result)
+ }
+
+ fun decrypt(encryptedContent: ByteArray, key: ByteArray, data: ByteArray):
ByteArray {
+ val buffer = ByteBuffer.wrap(encryptedContent)
+ val nonceLength = buffer.int
+ val nonce = ByteArray(nonceLength)
+ buffer.get(nonce)
+ val encriptedText = ByteArray(buffer.remaining())
+ buffer.get(encriptedText)
Review comment:
encrypted
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