added intercluster examples

additional-info/go.mod

+module example
+
+go 1.18

additional-info/inter-cluster.md

@@ -4,38 +4,22 @@
 Ejemplo de network inter: 
 
 ```yaml
-apiVersion: "k8s.cni.cncf.io/v1"
-kind: NetworkAttachmentDefinition
+apiVersion: l2sm.k8s.local/v1
+kind: L2SMNetwork
 metadata:
-  name: sample-inter-network
+  name: spain-network
 spec:
-  config: '{
-      "cniVersion": "0.3.0",
-      "type": "l2sm",
-      "device": "l2sm-vNet",
-      "kind": {
-        "ext-vnet": {
-          "provider": {
-            "name": "<idco-name>",
-            "domain": "<domain-name>"
-          },
-          "accessList": [ # no tiene porq ser así. Dejar en abierto.
-            # {
-            #   "user": "<username-1>",
-            #   "public-key": "<public-key-1>"
-            # },
-            # {
-            #   "user": "<username-2>",
-            #   "public-key": "<public-key-2>"
-            # },
-            # {
-            #   "user": "<username-3>",
-            #   "public-key": "<public-key-3>"
-            # } 
-          ]
-        }
-      }
-    }'
+  type: inter-vnet
+  config: |
+    {
+      "provider": {
+        "name": "uc3m",
+        "domain": "idco.uc3m.es"
+      },
+      "accessList": ["public-key-1", "public-key-2"]
+    }
+  signature: sxySO0jHw4h1kcqO/LMLDgOoOeH8dOn8vZWv4KMBq0upxz3lcbl+o/36JefpEwSlBJ6ukuKiQ79L4rsmmZgglk6y/VL54DFyLfPw9RJn3mzl99YE4qCaHyEBANSw+d5hPaJ/I8q+AMtjrYpglMTRPf0iMZQMNtMd0CdeX2V8aZOPCQP75PsZkWukPdoAK/++y1vbFQ6nQKagvpUZfr7Ecb4/QY+hIAzepm6N6lNiFNTgj6lGTrFK0qCVfRhMD+vXbBP6xzZjB2N1nIheK9vx7kvj3HORjZ+odVMa+AOU5ShSKpzXTvknrtcRTcWWmXPNUZLoq5k3U+z1g1OTFcjMdQ====
+
 ```
 Hay un NED conectado al L2S-M switch del nodo master con 10 interfaces veth (como el NED es hostNetwork, nos podemos permitir crear las interfaces y conectarlas directamente -> Necesario que l2sm-switch se despliegue más tarde).
 

additional-info/main.go

+package main
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"os"
+)
+
+func main() {
+
+	// Generate Alice RSA keys Of 2048 Buts
+	alicePrivateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		fmt.Println(err.Error)
+		os.Exit(1)
+	}
+	// Extract Public Key from RSA Private Key
+	alicePublicKey := alicePrivateKey.PublicKey
+	secretMessage := "IHsKICAgICAgInByb3ZpZGVyIjogewogICAgICAgICJuYW1lIjogInVjM20iLAogICAgICAgICJkb21haW4iOiAiaWRjby51YzNtLmVzIgogICAgICB9LAogICAgICAiYWNjZXNzTGlzdCI6IFsicHVibGljLWtleS0xIiwgInB1YmxpYy1rZXktMiJdCiAgICB9Cg"
+	fmt.Println("Original Text  ", secretMessage)
+	signature := SignPKCS1v15(secretMessage, *alicePrivateKey)
+	fmt.Println("Singature :  ", signature)
+	verif := VerifyPKCS1v15(signature, secretMessage, alicePublicKey)
+	fmt.Println(verif)
+}
+
+func SignPKCS1v15(plaintext string, privKey rsa.PrivateKey) string {
+	// crypto/rand.Reader is a good source of entropy for blinding the RSA
+	// operation.
+	rng := rand.Reader
+	hashed := sha256.Sum256([]byte(plaintext))
+	signature, err := rsa.SignPKCS1v15(rng, &privKey, crypto.SHA256, hashed[:])
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error from signing: %s\n", err)
+		return "Error from signing"
+	}
+	return base64.StdEncoding.EncodeToString(signature)
+}
+
+func VerifyPKCS1v15(signature string, plaintext string, pubkey rsa.PublicKey) string {
+	sig, _ := base64.StdEncoding.DecodeString(signature)
+	hashed := sha256.Sum256([]byte(plaintext))
+	err := rsa.VerifyPKCS1v15(&pubkey, crypto.SHA256, hashed[:], sig)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error from verification: %s\n", err)
+		return "Error from verification:"
+	}
+	return "Signature Verification Passed"
+}

examples/inter-cluster/inter-network.yaml

-apiVersion: "k8s.cni.cncf.io/v1"
-kind: NetworkAttachmentDefinition
+apiVersion: l2sm.k8s.local/v1
+kind: L2SMNetwork
 metadata:
-  name: sample-inter-network
+  name: spain-network
 spec:
-  config: '{
-      "cniVersion": "0.3.0",
-      "type": "l2sm",
-      "device": "l2sm-vNet",
-      "kind": {
-        "inter": {
-          "provider": {
-            "name": "<idco-name>",
-            "domain": "<domain-name>"
-          },
-          "accessList": ["<public-key-1>","<public-key-2>",...,"<public-key-N>"] 
-          ]
-        }
-      }
-    }'
+  type: inter-vnet
+  config: |
+    {
+      "provider": {
+        "name": "uc3m",
+        "domain": "idco.uc3m.es"
+      },
+      "accessList": ["public-key-1", "public-key-2"]
+    }
+  signature: sxySO0jHw4h1kcqO/LMLDgOoOeH8dOn8vZWv4KMBq0upxz3lcbl+o/36JefpEwSlBJ6ukuKiQ79L4rsmmZgglk6y/VL54DFyLfPw9RJn3mzl99YE4qCaHyEBANSw+d5hPaJ/I8q+AMtjrYpglMTRPf0iMZQMNtMd0CdeX2V8aZOPCQP75PsZkWukPdoAK/++y1vbFQ6nQKagvpUZfr7Ecb4/QY+hIAzepm6N6lNiFNTgj6lGTrFK0qCVfRhMD+vXbBP6xzZjB2N1nIheK9vx7kvj3HORjZ+odVMa+AOU5ShSKpzXTvknrtcRTcWWmXPNUZLoq5k3U+z1g1OTFcjMdQ====