init
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89
crypto/crypto.go
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89
crypto/crypto.go
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@@ -0,0 +1,89 @@
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package crypto
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/x509"
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"encoding/base64"
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"encoding/hex"
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"encoding/pem"
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"fmt"
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"log"
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)
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// HashToken hashes a token using SHA-256.
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func HashToken(token string) string {
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hash := sha256.Sum256([]byte(token))
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return hex.EncodeToString(hash[:])
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}
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// VerifyToken compares a plaintext token with a stored hash.
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func VerifyToken(token, storedHash string) bool {
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return HashToken(token) == storedHash
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}
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func main() string {
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// 1. Generiere einen privaten Schlüssel
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privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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log.Fatalf("Fehler beim Generieren des privaten Schlüssels: %v", err)
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}
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// 2. Extrahiere den öffentlichen Schlüssel
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publicKey := &privateKey.PublicKey
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// 3. Beispieltext zum Verschlüsseln
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plainText := "Dies ist ein geheimer String!"
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// 4. Verschlüssle den Text mit dem öffentlichen Schlüssel
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encryptedBytes, err := rsa.EncryptPKCS1v15(rand.Reader, publicKey, []byte(plainText))
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if err != nil {
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log.Fatalf("Fehler beim Verschlüsseln: %v", err)
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}
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// Kodierung des verschlüsselten Textes in Base64 für Lesbarkeit
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encryptedString := base64.StdEncoding.EncodeToString(encryptedBytes)
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fmt.Println("Verschlüsselter Text (Base64):", encryptedString)
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// 5. Entschlüssle den Text mit dem privaten Schlüssel
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decryptedBytes, err := rsa.DecryptPKCS1v15(rand.Reader, privateKey, encryptedBytes)
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if err != nil {
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log.Fatalf("Fehler beim Entschlüsseln: %v", err)
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}
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// 6. Gib den entschlüsselten Text aus
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decryptedString := string(decryptedBytes)
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fmt.Println("Entschlüsselter Text:", decryptedString)
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// 7. (Optional) Exportiere und Importiere die Schlüssel
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privateKeyPEM := exportPrivateKeyToPEM(privateKey)
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fmt.Println("\nPrivate Key (PEM):\n", privateKeyPEM)
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publicKeyPEM := exportPublicKeyToPEM(publicKey)
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fmt.Println("\nPublic Key (PEM):\n", publicKeyPEM)
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return ""
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}
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// Funktion, um den privaten Schlüssel in PEM-Format zu exportieren
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func exportPrivateKeyToPEM(privateKey *rsa.PrivateKey) string {
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privateKeyBytes := x509.MarshalPKCS1PrivateKey(privateKey)
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privateKeyPEM := pem.EncodeToMemory(&pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: privateKeyBytes,
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})
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return string(privateKeyPEM)
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}
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// Funktion, um den öffentlichen Schlüssel in PEM-Format zu exportieren
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func exportPublicKeyToPEM(publicKey *rsa.PublicKey) string {
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publicKeyBytes, err := x509.MarshalPKIXPublicKey(publicKey)
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if err != nil {
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log.Fatalf("Fehler beim Exportieren des öffentlichen Schlüssels: %v", err)
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}
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publicKeyPEM := pem.EncodeToMemory(&pem.Block{
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Type: "PUBLIC KEY",
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Bytes: publicKeyBytes,
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})
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return string(publicKeyPEM)
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}
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96
netproto/netproto.go
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96
netproto/netproto.go
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package netproto
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import (
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"encoding/base64"
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)
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type MainHeader struct {
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Version uint8 `json:"version"`
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Meta map[string]string `json:"meta"`
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ExtensionHeaders []ExtensionHeader `json:"extension_headers"`
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}
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const (
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MainHeaderVersion1 = 1
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)
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const (
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ExtensionHeaderType_Source uint8 = 1 /* https://git.send.nrw/sendnrw/sendnrwlib/issues/1 */
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ExtensionHeaderType_Destination uint8 = 2 /* https://git.send.nrw/sendnrw/sendnrwlib/issues/1 */
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ExtensionHeaderType_PayloadDefinition uint8 = 3
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ExtensionHeaderType_Protocol uint8 = 4
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ExtensionHeaderType_Control uint8 = 5 /*Steuerbefehle wie Download, Upload, ...*/
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ExtensionHeaderType_Crypto uint8 = 6 /*Hinweis auf eine Verschlüsselung*/
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ExtensionHeaderType_Validation uint8 = 7 /*Hinweis auf eine Validierung oder Checksum*/
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ExtensionHeaderType_Routing uint8 = 8 /*Hinweis auf eine Routing-Information*/
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)
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func GenerateEHT1(IPv4, IPv6, Port string) ExtensionHeader {
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return ExtensionHeader{
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Type: ExtensionHeaderType_Source,
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Meta: map[string]string{"version": "1.0"},
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Data: map[string]string{"ipv4": IPv4, "ipv6": IPv6, "port": Port},
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}
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}
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func GenerateEHT2(IPv4, IPv6, Port string) ExtensionHeader {
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return ExtensionHeader{
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Type: ExtensionHeaderType_Destination,
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Meta: map[string]string{"version": "1.0"},
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Data: map[string]string{"ipv4": IPv4, "ipv6": IPv6, "port": Port},
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}
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}
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func GenerateEHT3(PayloadMime, PayloadLength, PayloadChecksum string) ExtensionHeader {
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return ExtensionHeader{
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Type: ExtensionHeaderType_PayloadDefinition,
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Meta: map[string]string{"version": "1.0"},
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Data: map[string]string{"payloadmime": PayloadMime, "payloadlength": PayloadLength, "payloadchecksum": PayloadChecksum},
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}
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}
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func GenerateEHT4(ProtocolName, ProtocolVersion, ProtocolOID string) ExtensionHeader {
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return ExtensionHeader{
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Type: ExtensionHeaderType_Protocol,
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Meta: map[string]string{"version": "1.0"},
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Data: map[string]string{"protocolname": ProtocolName, "protocolversion": ProtocolVersion, "protocoloid": ProtocolOID},
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}
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}
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func GenerateEHT7(Checksum string) ExtensionHeader {
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return ExtensionHeader{
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Type: ExtensionHeaderType_Validation,
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Meta: map[string]string{"version": "1.0"},
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Data: map[string]string{"checksum": Checksum},
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}
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}
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func GenerateMH(Version uint8, Flag string) MainHeader {
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return MainHeader{
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Version: Version,
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Meta: map[string]string{"version": "1.0", "flag": Flag},
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}
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}
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func EncodeB64(input string) (string, error) {
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return base64.StdEncoding.EncodeToString([]byte(input)), nil
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}
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func DecodeB64(input string) (string, error) {
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d, err := base64.StdEncoding.DecodeString(input)
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if err != nil {
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return "", err
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}
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return string(d), nil
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}
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type ExtensionHeader struct {
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Type uint8 `json:"type"`
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Meta map[string]string `json:"meta"`
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Data map[string]string `json:"data"`
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}
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type NetworkProtocol struct {
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Header MainHeader `json:"header"`
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Payload string `json:"payload"`
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}
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