Added _steam_ jvm and js implementations

multiplatform-crypto-libsodium-bindings/src/jvmMain/kotlin/com/ionspin/kotlin/crypto/stream/Stream.kt

@@ -0,0 +1,98 @@
+package com.ionspin.kotlin.crypto.stream
+
+import com.ionspin.kotlin.crypto.LibsodiumInitializer.sodium
+
+actual object Stream {
+    actual fun chacha20(clen: Int, nonce: UByteArray, key: UByteArray): UByteArray {
+        val result = UByteArray(clen)
+
+        sodium.crypto_stream_chacha20(result.asByteArray(), clen.toLong(), nonce.asByteArray(), key.asByteArray())
+
+        return result
+    }
+
+    actual fun chacha20IetfXor(
+        message: UByteArray,
+        nonce: UByteArray,
+        key: UByteArray
+    ): UByteArray {
+        val result = UByteArray(message.size)
+
+        sodium.crypto_stream_chacha20_ietf_xor(
+            result.asByteArray(),
+            message.asByteArray(),
+            message.size.toLong(),
+            nonce.asByteArray(),
+            key.asByteArray()
+        )
+
+        return result
+    }
+
+    actual fun chacha20IetfXorIc(
+        message: UByteArray,
+        nonce: UByteArray,
+        initialCounter: ULong,
+        key: UByteArray
+    ): UByteArray {
+        val result = UByteArray(message.size)
+
+        sodium.crypto_stream_chacha20_ietf_xor_ic(
+            result.asByteArray(),
+            message.asByteArray(),
+            message.size.toLong(),
+            nonce.asByteArray(),
+            initialCounter.toLong(),
+            key.asByteArray()
+        )
+
+        return result
+    }
+
+    actual fun chacha20Keygen(): UByteArray {
+        val result = UByteArray(crypto_stream_chacha20_KEYBYTES)
+
+        sodium.crypto_stream_chacha20_keygen(result.asByteArray())
+
+        return result
+    }
+
+    actual fun chacha20Xor(
+        message: UByteArray,
+        nonce: UByteArray,
+        key: UByteArray
+    ): UByteArray {
+        val result = UByteArray(message.size)
+
+        sodium.crypto_stream_chacha20_xor(
+            result.asByteArray(),
+            message.asByteArray(),
+            message.size.toLong(),
+            nonce.asByteArray(),
+            key.asByteArray()
+        )
+
+        return result
+    }
+
+    actual fun chacha20XorIc(
+        message: UByteArray,
+        nonce: UByteArray,
+        initialCounter: ULong,
+        key: UByteArray
+    ): UByteArray {
+        val result = UByteArray(message.size)
+
+        sodium.crypto_stream_chacha20_xor_ic(
+            result.asByteArray(),
+            message.asByteArray(),
+            message.size.toLong(),
+            nonce.asByteArray(),
+            initialCounter.toLong(),
+            key.asByteArray()
+        )
+
+
+        return result
+    }
+}