Added rekey and keygen to secretstream

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/secretstream/SecretStream.kt

@@ -11,11 +11,22 @@ data class SecretStreamStateAndHeader(val state: SecretStreamState, val header :
 
 data class DecryptedDataAndTag(val decryptedData : UByteArray, val tag : UByte)
 
+val crypto_secretstream_xchacha20poly1305_TAG_MESSAGE = 0
+val crypto_secretstream_xchacha20poly1305_TAG_PUSH = 1
+val crypto_secretstream_xchacha20poly1305_TAG_REKEY = 2
+val crypto_secretstream_xchacha20poly1305_TAG_FINAL = 3
+
+val crypto_secretstream_xchacha20poly1305_HEADERBYTES = 24
+val crypto_secretstream_xchacha20poly1305_KEYBYTES = 32
+val crypto_secretstream_xchacha20poly1305_ABYTES = 17
+
 expect object SecretStream {
 
     fun xChaCha20Poly1305InitPush(key: UByteArray) : SecretStreamStateAndHeader
     fun xChaCha20Poly1305Push(state : SecretStreamState, message: UByteArray, additionalData : UByteArray = ubyteArrayOf(), tag: UByte) : UByteArray
     fun xChaCha20Poly1305InitPull(key: UByteArray, header: UByteArray) : SecretStreamStateAndHeader
     fun xChaCha20Poly1305Pull(state : SecretStreamState, ciphertext: UByteArray, additionalData : UByteArray = ubyteArrayOf()) : DecryptedDataAndTag
+    fun xChaCha20Poly1305Keygen() : UByteArray
+    fun xChaCha20Poly1305Rekey(state: SecretStreamState)
 
 }

multiplatform-crypto-libsodium-bindings/src/jsMain/kotlin/com/ionspin/kotlin/crypto/JsSodiumInterface.kt

@@ -57,6 +57,10 @@ interface JsSodiumInterface {
     fun crypto_secretstream_xchacha20poly1305_init_pull(header: Uint8Array, key: Uint8Array) : dynamic
     fun crypto_secretstream_xchacha20poly1305_pull(state: dynamic, ciphertext: Uint8Array, additionalData: Uint8Array) : dynamic
 
+    //keygen and rekey
+    fun crypto_secretstream_xchacha20poly1305_keygen() : Uint8Array
+    fun crypto_secretstream_xchacha20poly1305_rekey(state: dynamic)
+
     //util
     fun memzero(array: Uint8Array)
 

multiplatform-crypto-libsodium-bindings/src/jsMain/kotlin/com/ionspin/kotlin/crypto/secretstream/SecretStream.kt

@@ -44,4 +44,12 @@ actual object SecretStream {
 
     }
 
+    actual fun xChaCha20Poly1305Keygen(): UByteArray {
+        return getSodium().crypto_shorthash_keygen().toUByteArray()
+    }
+
+    actual fun xChaCha20Poly1305Rekey(state: SecretStreamState) {
+        getSodium().crypto_secretstream_xchacha20poly1305_rekey(state)
+    }
+
 }

multiplatform-crypto-libsodium-bindings/src/jvmMain/kotlin/com/ionspin/kotlin/crypto/secretstream/SecretStream.kt

@@ -19,7 +19,7 @@ actual object SecretStream {
         additionalData: UByteArray,
         tag: UByte
     ): UByteArray {
-        val ciphertext = UByteArray(message.size + 17)
+        val ciphertext = UByteArray(message.size + crypto_secretstream_xchacha20poly1305_ABYTES)
         sodium.crypto_secretstream_xchacha20poly1305_push(
             state,
             ciphertext.asByteArray(),
@@ -47,7 +47,7 @@ actual object SecretStream {
         ciphertext: UByteArray,
         additionalData: UByteArray
     ): DecryptedDataAndTag {
-        val result = UByteArray(ciphertext.size - 17)
+        val result = UByteArray(ciphertext.size - crypto_secretstream_xchacha20poly1305_ABYTES)
         val tagArray = UByteArray(1) { 0U }
         sodium.crypto_secretstream_xchacha20poly1305_pull(
             state,
@@ -62,4 +62,14 @@ actual object SecretStream {
         return DecryptedDataAndTag(result, tagArray[0])
     }
 
+    actual fun xChaCha20Poly1305Keygen(): UByteArray {
+        val generatedKey = UByteArray(crypto_aead_xchacha20poly1305_ietf_KEYBYTES)
+        sodium.crypto_secretstream_xchacha20poly1305_keygen(generatedKey.asByteArray())
+        return generatedKey
+    }
+
+    actual fun xChaCha20Poly1305Rekey(state: SecretStreamState) {
+        sodium.crypto_secretstream_xchacha20poly1305_rekey(state)
+    }
+
 }

multiplatform-crypto-libsodium-bindings/src/nativeMain/kotlin/com/ionspin/kotlin/crypto/secretstream/SecretStream.kt

@@ -10,8 +10,10 @@ import libsodium.crypto_secretstream_xchacha20poly1305_ABYTES
 import libsodium.crypto_secretstream_xchacha20poly1305_headerbytes
 import libsodium.crypto_secretstream_xchacha20poly1305_init_pull
 import libsodium.crypto_secretstream_xchacha20poly1305_init_push
+import libsodium.crypto_secretstream_xchacha20poly1305_keygen
 import libsodium.crypto_secretstream_xchacha20poly1305_pull
 import libsodium.crypto_secretstream_xchacha20poly1305_push
+import libsodium.crypto_secretstream_xchacha20poly1305_rekey
 import platform.posix.malloc
 
 actual typealias SecretStreamState = libsodium.crypto_secretstream_xchacha20poly1305_state
@@ -119,4 +121,16 @@ actual object SecretStream {
         return DecryptedDataAndTag(message, tag[0])
     }
 
+    actual fun xChaCha20Poly1305Keygen(): UByteArray {
+        val generatedKey = UByteArray(crypto_secretstream_xchacha20poly1305_KEYBYTES)
+        val generatedKeyPinned = generatedKey.pin()
+        crypto_secretstream_xchacha20poly1305_keygen(generatedKeyPinned.toPtr())
+        generatedKeyPinned.unpin()
+        return generatedKey
+    }
+
+    actual fun xChaCha20Poly1305Rekey(state: SecretStreamState) {
+        crypto_secretstream_xchacha20poly1305_rekey(state.ptr)
+    }
+
 }