// Last 4 bytes remain zero-initialized
        } else if (nonce.length == 16) {
            // For GCM cipher, use full 16-byte nonce
            System.arraycopy(nonce, 0, this.nonce, 0, 16);
        } else {
            throw new IllegalArgumentException("Nonce must be 12 bytes (CCM) or 16 bytes (GCM)");
        }
        this.originalMessageSize = originalMessageSize;
        this.flags = flags;

**Protocol Selection:**
- Default Range: SMB1 to SMB 3.1.1
- Automatic Negotiation: Client offers all supported dialects, server selects highest common version
- Configurable: Min/max versions can be set via configuration properties

### SMB3 Encryption Support
- **SMB2 Transform Header**: Encrypted message wrapping

    /**
     * AES 128 CCM
     */
    public static final int CIPHER_AES128_CCM = 0x1;

    /**
     * AES 128 GCM
     */
    public static final int CIPHER_AES128_GCM = 0x2;

    /**
     * AES 256 CCM
     */
    public static final int CIPHER_AES256_CCM = 0x3;

    /**
     * AES 256 GCM
     */
    public static final int CIPHER_AES256_GCM = 0x4;

    private int[] ciphers;

    /**

jdk.tls.legacyAlgorithms= \
        K_NULL, C_NULL, M_NULL, \
        DH_anon, ECDH_anon, \
        RC4_128, RC4_40, DES_CBC, DES40_CBC, \
        3DES_EDE_CBC
jdk.tls.keyLimits=AES/GCM/NoPadding KeyUpdate 2^37
crypto.policy=unlimited
jdk.xml.dsig.secureValidationPolicy=\
    disallowAlg http://www.w3.org/TR/1999/REC-xslt-19991116,\
    disallowAlg http://www.w3.org/2001/04/xmldsig-more#rsa-md5,\

	return []uint16{
		tls.TLS_CHACHA20_POLY1305_SHA256, // TLS 1.3
		tls.TLS_AES_128_GCM_SHA256,
		tls.TLS_AES_256_GCM_SHA384,
		tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, // TLS 1.2 ECDHE GCM / POLY1305
		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
		tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
		tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,

jdk.tls.legacyAlgorithms= \
        K_NULL, C_NULL, M_NULL, \
        DH_anon, ECDH_anon, \
        RC4_128, RC4_40, DES_CBC, DES40_CBC, \
        3DES_EDE_CBC
jdk.tls.keyLimits=AES/GCM/NoPadding KeyUpdate 2^37
crypto.policy=unlimited
jdk.xml.dsig.secureValidationPolicy=\
    disallowAlg http://www.w3.org/TR/1999/REC-xslt-19991116,\
    disallowAlg http://www.w3.org/2001/04/xmldsig-more#rsa-md5,\

```

`--sftp=cipher-algos=...` specifies the allowed cipher algorithms. 
If unspecified then a sensible default is used.

Valid values: 
```
aes128-ctr
aes192-ctr
aes256-ctr
aes128-gcm@openssh.com
aes256-gcm@openssh.com
******@****.***
arcfour256
arcfour128
arcfour
aes128-cbc
3des-cbc
```

`--sftp=mac-algos=...` specifies a default set of MAC algorithms in preference order.

		return ErrNotSupported
	}
	return ErrKeyExists
}

// GenerateKey decrypts req.Ciphertext. The key name req.Name must match the key
// name of the secretKey.
//
// The returned DEK is encrypted using AES-GCM and the ciphertext format is compatible
// with KES and MinKMS.
func (s secretKey) GenerateKey(_ context.Context, req *GenerateKeyRequest) (DEK, error) {
	if req.Name != s.keyID {
		return DEK{}, ErrKeyNotFound
	}

            if (config.isEncryptionEnabled()) {
                // Build cipher list based on AES-256 support
                List<Integer> ciphers = new ArrayList<>();

                // Prefer GCM over CCM for better performance
                if (config.isAES256Enabled()) {
                    ciphers.add(EncryptionNegotiateContext.CIPHER_AES256_GCM);