    public BCXMSSPrivateKey(PrivateKeyInfo keyInfo)
        throws IOException
    {
        XMSSKeyParams keyParams = XMSSKeyParams.getInstance(keyInfo.getPrivateKeyAlgorithm().getParameters());
        this.treeDigest = keyParams.getTreeDigest().getAlgorithm();

        XMSSPrivateKey xmssPrivateKey = XMSSPrivateKey.getInstance(keyInfo.parsePrivateKey());

        try
        {
            XMSSPrivateKeyParameters.Builder keyBuilder = new XMSSPrivateKeyParameters
                .Builder(new XMSSParameters(keyParams.getHeight(), DigestUtil.getDigest(treeDigest)))
                .withIndex(xmssPrivateKey.getIndex())
                .withSecretKeySeed(xmssPrivateKey.getSecretKeySeed())
                .withSecretKeyPRF(xmssPrivateKey.getSecretKeyPRF())
                .withPublicSeed(xmssPrivateKey.getPublicSeed())
                .withRoot(xmssPrivateKey.getRoot());

            if (xmssPrivateKey.getBdsState() != null)
            {
                keyBuilder.withBDSState((BDS)XMSSUtil.deserialize(xmssPrivateKey.getBdsState()));
            }

            this.keyParams = keyBuilder.build();
        }
        catch (ClassNotFoundException e)
        {
            throw new IOException("ClassNotFoundException processing BDS state: " + e.getMessage());
        }
    }