/**
     *
     */
    private Smb3KeyDerivation() {
    }

    /**
     * Derives the SMB3 signing key from the session key using the appropriate KDF for the dialect.
     *
     * @param dialect the SMB dialect version
     * @param sessionKey the base session key
     * @param preauthIntegrity the pre-authentication integrity hash (for SMB 3.1.1) or null

        checkNotClosed();

        // Simple KDF implementation (should be replaced with proper KDF like HKDF)
        // This is a placeholder - real implementation should use proper KDF
        byte[] derived = new byte[length];

        // Combine inputs
        byte[] labelBytes = label.getBytes(java.nio.charset.StandardCharsets.UTF_8);

		if err != nil {
			t.Fatalf("Test %d: Failed to encrypt request: %v", i, err)
		}
		if kdf, ok := test.metadata[crypto.MetaAlgorithm]; !ok {
			t.Errorf("Test %d: ServerSideEncryptionKDF must be part of metadata: %v", i, kdf)
		}
		if iv, ok := test.metadata[crypto.MetaIV]; !ok {
			t.Errorf("Test %d: crypto.SSEIV must be part of metadata: %v", i, iv)
		}

- **AES-CCM/GCM Support**: Both AES-128-CCM (SMB 3.0/3.0.2) and AES-128-GCM (SMB 3.1.1) cipher suites
- **Encryption Context**: Per-session encryption state management
- **Key Derivation**: SMB3 KDF implementation with dialect-specific parameters
- **Pre-Authentication Integrity**: SMB 3.1.1 PAI for preventing downgrade attacks
- **Automatic Detection**: Encryption automatically enabled when servers require it

        saltBuffer.putInt(rotationCount); // Rotation counter
        saltBuffer.putInt((int) (System.currentTimeMillis() / 1000)); // Timestamp for additional uniqueness

        // Derive new keys using SMB3 KDF with rotation-specific input
        final int dialectInt = dialect.getDialect();
        final byte[] newEncryptionKey = Smb3KeyDerivation.deriveEncryptionKey(dialectInt, modifiedSessionKey, preauthIntegrityHash);

        } else {
            throw new SmbUnsupportedOperationException("SMB3 required for encryption, negotiated: " + dialect);
        }

        try {
            // Derive encryption and decryption keys using SMB3 KDF
            final int dialectInt = dialect.getDialect();
            final byte[] encryptionKey = Smb3KeyDerivation.deriveEncryptionKey(dialectInt, sessionKey, preauthHash);

for use in XAES-256-GCM (https://c2sp.org/XAES-256-GCM), // rather than for exposing it to applications as a stand-alone KDF. type CounterKDF struct { mac CMAC } // NewCounterKDF creates a new CounterKDF with the given key. func NewCounterKDF(b *aes.Block) *CounterKDF { return &CounterKDF{mac: *NewCMAC(b)} } // DeriveKey derives a key from the given label and context. func (kdf *CounterKDF) DeriveKey(label byte, context [12]byte) [32]byte { fips140.RecordApproved() var output [32]byte var input [aes.BlockSize]byte...