//  [java]
    private XMSSMTPrivateKeyParameters(Builder builder)
    {
        super(true);
        params = builder.params;
        if (params == null)
        {
            throw new NullPointerException("params == null");
        }
        int n = params.getDigestSize();
        byte[] privateKey = builder.privateKey;
        if (privateKey != null)
        {
            if (builder.xmss == null)
            {
                throw new NullPointerException("xmss == null");
            }
            /* import */
            int totalHeight = params.getHeight();
            int indexSize = (totalHeight + 7) / 8;
            int secretKeySize = n;
            int secretKeyPRFSize = n;
            int publicSeedSize = n;
            int rootSize = n;
            /*
            int totalSize = indexSize + secretKeySize + secretKeyPRFSize + publicSeedSize + rootSize;
			if (privateKey.length != totalSize) {
				throw new ParseException("private key has wrong size", 0);
			}
			*/
            int position = 0;
            index = XMSSUtil.bytesToXBigEndian(privateKey, position, indexSize);
            if (!XMSSUtil.isIndexValid(totalHeight, index))
            {
                throw new IllegalArgumentException("index out of bounds");
            }
            position += indexSize;
            secretKeySeed = XMSSUtil.extractBytesAtOffset(privateKey, position, secretKeySize);
            position += secretKeySize;
            secretKeyPRF = XMSSUtil.extractBytesAtOffset(privateKey, position, secretKeyPRFSize);
            position += secretKeyPRFSize;
            publicSeed = XMSSUtil.extractBytesAtOffset(privateKey, position, publicSeedSize);
            position += publicSeedSize;
            root = XMSSUtil.extractBytesAtOffset(privateKey, position, rootSize);
            position += rootSize;
			/* import BDS state */
            byte[] bdsStateBinary = XMSSUtil.extractBytesAtOffset(privateKey, position, privateKey.length - position);

            try
            {
                BDSStateMap bdsImport = (BDSStateMap)XMSSUtil.deserialize(bdsStateBinary, BDSStateMap.class);

                bdsImport.setXMSS(builder.xmss);
                bdsState = bdsImport;
            }
            catch (IOException e)
            {
                throw new IllegalArgumentException(e.getMessage(), e);
            }
            catch (ClassNotFoundException e)
            {
                throw new IllegalArgumentException(e.getMessage(), e);
            }
        }
        else
        {
			/* set */
            index = builder.index;
            byte[] tmpSecretKeySeed = builder.secretKeySeed;
            if (tmpSecretKeySeed != null)
            {
                if (tmpSecretKeySeed.length != n)
                {
                    throw new IllegalArgumentException("size of secretKeySeed needs to be equal size of digest");
                }
                secretKeySeed = tmpSecretKeySeed;
            }
            else
            {
                secretKeySeed = new byte[n];
            }
            byte[] tmpSecretKeyPRF = builder.secretKeyPRF;
            if (tmpSecretKeyPRF != null)
            {
                if (tmpSecretKeyPRF.length != n)
                {
                    throw new IllegalArgumentException("size of secretKeyPRF needs to be equal size of digest");
                }
                secretKeyPRF = tmpSecretKeyPRF;
            }
            else
            {
                secretKeyPRF = new byte[n];
            }
            byte[] tmpPublicSeed = builder.publicSeed;
            if (tmpPublicSeed != null)
            {
                if (tmpPublicSeed.length != n)
                {
                    throw new IllegalArgumentException("size of publicSeed needs to be equal size of digest");
                }
                publicSeed = tmpPublicSeed;
            }
            else
            {
                publicSeed = new byte[n];
            }
            byte[] tmpRoot = builder.root;
            if (tmpRoot != null)
            {
                if (tmpRoot.length != n)
                {
                    throw new IllegalArgumentException("size of root needs to be equal size of digest");
                }
                root = tmpRoot;
            }
            else
            {
                root = new byte[n];
            }
            BDSStateMap tmpBDSState = builder.bdsState;
            if (tmpBDSState != null)
            {
                bdsState = tmpBDSState;
            }
            else
            {
                long globalIndex = builder.index;
                int totalHeight = params.getHeight();

                if (XMSSUtil.isIndexValid(totalHeight, globalIndex) && tmpPublicSeed != null && tmpSecretKeySeed != null)
                {
                    bdsState = new BDSStateMap(params, builder.index, tmpPublicSeed, tmpSecretKeySeed);
                }
                else
                {
                    bdsState = new BDSStateMap();
                }
            }
        }
    }