diff --git a/c2s_sni_spoof/pkg/tls/sni.go b/c2s_sni_spoof/pkg/tls/sni.go
new file mode 100644
index 0000000..da87849
--- /dev/null
+++ b/c2s_sni_spoof/pkg/tls/sni.go
@@ -0,0 +1,245 @@
+// Package tlsutil provides shared TLS utilities for the SNI-spoofing C2.
+//
+// It handles self-signed certificate generation, TLS configuration for
+// both the server (accepts any SNI) and the client (spoofs the SNI),
+// and helpers for logging the ClientHello SNI value.
+package tlsutil
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	"math/big"
+	"os"
+	"time"
+)
+
+// ---------- CA + Server certificate generation ----------
+
+// GenerateCA creates a self-signed CA key and certificate (10 year validity).
+func GenerateCA() (*ecdsa.PrivateKey, *x509.Certificate, error) {
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		return nil, nil, fmt.Errorf("generating CA key: %w", err)
+	}
+
+	serial, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
+	if err != nil {
+		return nil, nil, fmt.Errorf("generating CA serial: %w", err)
+	}
+
+	template := &x509.Certificate{
+		SerialNumber: serial,
+		Subject: pkix.Name{
+			Organization: []string{"C2 SNI Spoof CA"},
+			CommonName:   "C2 SNI Spoof CA",
+		},
+		NotBefore:             time.Now().Add(-24 * time.Hour),
+		NotAfter:              time.Now().Add(3650 * 24 * time.Hour),
+		KeyUsage:              x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature,
+		BasicConstraintsValid: true,
+		IsCA:                  true,
+		MaxPathLen:            1,
+	}
+
+	certDER, err := x509.CreateCertificate(rand.Reader, template, template, &key.PublicKey, key)
+	if err != nil {
+		return nil, nil, fmt.Errorf("creating CA certificate: %w", err)
+	}
+
+	cert, err := x509.ParseCertificate(certDER)
+	if err != nil {
+		return nil, nil, fmt.Errorf("parsing CA certificate: %w", err)
+	}
+
+	return key, cert, nil
+}
+
+// GenerateServerCert creates a server certificate signed by the provided CA.
+// The certificate includes a wildcard DNSName so it's valid for any hostname.
+func GenerateServerCert(caKey *ecdsa.PrivateKey, caCert *x509.Certificate) (*ecdsa.PrivateKey, *x509.Certificate, error) {
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		return nil, nil, fmt.Errorf("generating server key: %w", err)
+	}
+
+	serial, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
+	if err != nil {
+		return nil, nil, fmt.Errorf("generating server serial: %w", err)
+	}
+
+	template := &x509.Certificate{
+		SerialNumber: serial,
+		Subject: pkix.Name{
+			Organization: []string{"C2 SNI Spoof Server"},
+			CommonName:   "C2 Server",
+		},
+		NotBefore: time.Now().Add(-24 * time.Hour),
+		NotAfter:  time.Now().Add(3650 * 24 * time.Hour),
+		KeyUsage:  x509.KeyUsageDigitalSignature,
+		ExtKeyUsage: []x509.ExtKeyUsage{
+			x509.ExtKeyUsageServerAuth,
+		},
+		// Wildcard so it validates against any SNI the client sends.
+		DNSNames: []string{"*"},
+	}
+
+	certDER, err := x509.CreateCertificate(rand.Reader, template, caCert, &key.PublicKey, caKey)
+	if err != nil {
+		return nil, nil, fmt.Errorf("creating server certificate: %w", err)
+	}
+
+	cert, err := x509.ParseCertificate(certDER)
+	if err != nil {
+		return nil, nil, fmt.Errorf("parsing server certificate: %w", err)
+	}
+
+	return key, cert, nil
+}
+
+// ---------- PEM save / load helpers ----------
+
+// SaveCertToFile writes a certificate as PEM.
+func SaveCertToFile(cert *x509.Certificate, path string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return fmt.Errorf("creating %s: %w", path, err)
+	}
+	defer f.Close()
+	return pem.Encode(f, &pem.Block{Type: "CERTIFICATE", Bytes: cert.Raw})
+}
+
+// SaveKeyToFile writes an ECDSA private key as PEM (SEC1 / PKCS8-style).
+func SaveKeyToFile(key *ecdsa.PrivateKey, path string) error {
+	keyBytes, err := x509.MarshalECPrivateKey(key)
+	if err != nil {
+		return fmt.Errorf("marshaling EC key: %w", err)
+	}
+	f, err := os.Create(path)
+	if err != nil {
+		return fmt.Errorf("creating %s: %w", path, err)
+	}
+	defer f.Close()
+	return pem.Encode(f, &pem.Block{Type: "EC PRIVATE KEY", Bytes: keyBytes})
+}
+
+// LoadCertFromFile reads a PEM certificate.
+func LoadCertFromFile(path string) (*x509.Certificate, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading %s: %w", path, err)
+	}
+	block, _ := pem.Decode(data)
+	if block == nil {
+		return nil, fmt.Errorf("no PEM block in %s", path)
+	}
+	return x509.ParseCertificate(block.Bytes)
+}
+
+// LoadKeyFromFile reads an ECDSA PEM private key.
+func LoadKeyFromFile(path string) (*ecdsa.PrivateKey, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading %s: %w", path, err)
+	}
+	block, _ := pem.Decode(data)
+	if block == nil {
+		return nil, fmt.Errorf("no PEM block in %s", path)
+	}
+	return x509.ParseECPrivateKey(block.Bytes)
+}
+
+// LoadOrGenerateTLSConfig loads server TLS credentials from disk, or
+// auto-generates a fresh CA + server cert chain and saves to the given paths.
+// Returns a *tls.Config suitable for the TLS server.
+func LoadOrGenerateTLSConfig(certFile, keyFile, caFile string) (*tls.Config, error) {
+	// Check if both server cert and key exist.
+	if _, err := os.Stat(certFile); err == nil {
+		if _, err := os.Stat(keyFile); err == nil {
+			cert, err := tls.LoadX509KeyPair(certFile, keyFile)
+			if err == nil {
+				return &tls.Config{
+					Certificates: []tls.Certificate{cert},
+				}, nil
+			}
+			fmt.Fprintf(os.Stderr, "warning: could not load key pair (%v), regenerating\n", err)
+		}
+	}
+
+	caKey, caCert, err := GenerateCA()
+	if err != nil {
+		return nil, fmt.Errorf("generating CA: %w", err)
+	}
+	serverKey, serverCert, err := GenerateServerCert(caKey, caCert)
+	if err != nil {
+		return nil, fmt.Errorf("generating server cert: %w", err)
+	}
+
+	// Persist everything.
+	if err := SaveCertToFile(caCert, caFile); err != nil {
+		return nil, err
+	}
+	if err := SaveCertToFile(serverCert, certFile); err != nil {
+		return nil, err
+	}
+	if err := SaveKeyToFile(serverKey, keyFile); err != nil {
+		return nil, err
+	}
+
+	tlsCert := tls.Certificate{
+		Certificate: [][]byte{serverCert.Raw},
+		PrivateKey:  serverKey,
+	}
+	return &tls.Config{
+		Certificates: []tls.Certificate{tlsCert},
+	}, nil
+}
+
+// ServerTLSConfig returns a *tls.Config that accepts connections with any SNI
+// and logs the SNI via GetConfigForClient for monitoring purposes.
+func ServerTLSConfig(certFile, keyFile, caFile string) (*tls.Config, error) {
+	cfg, err := LoadOrGenerateTLSConfig(certFile, keyFile, caFile)
+	if err != nil {
+		return nil, err
+	}
+	cfg.GetConfigForClient = func(hello *tls.ClientHelloInfo) (*tls.Config, error) {
+		// We log the SNI here; return nil to use the base config.
+		if hello.ServerName != "" {
+			fmt.Fprintf(os.Stderr, "[sni-log] ClientHello SNI: %s\n", hello.ServerName)
+		}
+		return nil, nil
+	}
+	return cfg, nil
+}
+
+// ClientTLSConfig builds a *tls.Config for the implant side.
+// The ServerName is set to the spoofed domain.
+// If a CA file is present the client will verify against it; otherwise
+// InsecureSkipVerify is used (typical for self-signed certs).
+func ClientTLSConfig(sniDomain, caFile string) (*tls.Config, error) {
+	cfg := &tls.Config{
+		ServerName: sniDomain,
+	}
+
+	if data, err := os.ReadFile(caFile); err == nil {
+		pool := x509.NewCertPool()
+		if pool.AppendCertsFromPEM(data) {
+			cfg.RootCAs = pool
+			return cfg, nil
+		}
+	}
+	// Fall back to insecure (no CA verification) — common for C2 implants.
+	cfg.InsecureSkipVerify = true
+	return cfg, nil
+}
+
+// ExtractSNI returns the SNI value from a server-side TLS connection after
+// the handshake completes.  Will be empty if the client sent no SNI.
+func ExtractSNI(conn *tls.Conn) string {
+	return conn.ConnectionState().ServerName
+}