IBSCertificate.java

package hamaster.gradesgin.ibs;

import static hamaster.gradesign.ibe.util.Hex.bytesToInt;
import static hamaster.gradesign.ibe.util.Hex.bytesToLong;
import static hamaster.gradesign.ibe.util.Hex.intToByte;
import static hamaster.gradesign.ibe.util.Hex.longToBytes;
import hamaster.gradesgin.ibe.IBEPublicParameter;
import hamaster.gradesgin.ibe.IBESystemParameter;
import hamaster.gradesgin.util.MemoryUtil;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Date;

/**
 * IBS数字证书对象
 * @author <a href="mailto:wangyeee@gmail.com">Wang Ye</a>
 */
public class IBSCertificate extends IBESystemParameter implements Serializable {
	private static final long serialVersionUID = 1203770296311146389L;

	/**
	 * 所有者
	 */
	protected String ownerString;

	/**
	 * 证书签名
	 */
	protected IBSSignature signature;

	/**
	 * 有效期开始日期
	 */
	protected Date noEarlyThan;

	/**
	 * 有效期结束日期
	 */
	protected Date noLateThan;

	public IBSCertificate() {
	}

	public String getOwnerString() {
		return ownerString;
	}

	public void setOwnerString(String ownerString) {
		this.ownerString = ownerString;
	}

	public IBSSignature getSignature() {
		return signature;
	}

	public void setSignature(IBSSignature signature) {
		this.signature = signature;
	}

	public Date getNoEarlyThan() {
		return noEarlyThan;
	}

	public void setNoEarlyThan(Date noEarlyThan) {
		this.noEarlyThan = noEarlyThan;
	}

	public Date getNoLateThan() {
		return noLateThan;
	}

	public void setNoLateThan(Date noLateThan) {
		this.noLateThan = noLateThan;
	}

	/*
	 * (non-Javadoc)
	 * @see hamaster.gradesgin.ibe.IBESystemParameter#hashCode()
	 */
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = super.hashCode();
		result = prime * result
				+ ((noEarlyThan == null) ? 0 : noEarlyThan.hashCode());
		result = prime * result
				+ ((noLateThan == null) ? 0 : noLateThan.hashCode());
		result = prime * result
				+ ((ownerString == null) ? 0 : ownerString.hashCode());
		result = prime * result
				+ ((signature == null) ? 0 : signature.hashCode());
		return result;
	}

	/*
	 * (non-Javadoc)
	 * @see hamaster.gradesgin.ibe.IBESystemParameter#equals(java.lang.Object)
	 */
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!super.equals(obj))
			return false;
		if (!(obj instanceof IBSCertificate))
			return false;
		IBSCertificate other = (IBSCertificate) obj;
		if (noEarlyThan == null) {
			if (other.noEarlyThan != null)
				return false;
		} else if (!noEarlyThan.equals(other.noEarlyThan))
			return false;
		if (noLateThan == null) {
			if (other.noLateThan != null)
				return false;
		} else if (!noLateThan.equals(other.noLateThan))
			return false;
		if (ownerString == null) {
			if (other.ownerString != null)
				return false;
		} else if (!ownerString.equals(other.ownerString))
			return false;
		if (signature == null) {
			if (other.signature != null)
				return false;
		} else if (!signature.equals(other.signature))
			return false;
		return true;
	}

	/*
	 * (non-Javadoc)
	 * @see hamaster.gradesgin.ibe.IBESystemParameter#toString()
	 */
	@Override
	public String toString() {
		return "IBSCertificate [ownerString=" + ownerString + ", signature="
				+ signature + ", noEarlyThan=" + noEarlyThan + ", noLateThan="
				+ noLateThan + ", publicParameter=" + publicParameter
				+ ", masterKey=" + Arrays.toString(masterKey) + "]";
	}

	/**
	 * 序列化字段：<br>
	 * 公共参数<br>
	 * 签名主密钥 20字节<br>
	 * 证书有效期开始 8字节<br>
	 * 证书有效期 8字节<br>
	 * 所有者字符串长度 4字节<br>
	 * 所有者字符串 长度由前4字节定义<br>
	 * 根证书签名
	 * @see hamaster.gradesgin.ibe.IBEConstraints#writeExternal(java.io.OutputStream)
	 */
	@Override
	public void writeExternal(OutputStream out) throws IOException {
		publicParameter.writeExternal(out);
		byte[] mBuffer = new byte[IBE_ZR_SIZE];
		Arrays.fill(mBuffer, (byte) 0);
		if (masterKey != null)
			System.arraycopy(masterKey, 0, mBuffer, 0, IBE_ZR_SIZE);
		out.write(mBuffer);
		long start = noEarlyThan == null ? 0L : noEarlyThan.getTime();
		long end = noLateThan == null ? 0L : noLateThan.getTime();
		out.write(longToBytes(start));
		out.write(longToBytes(end - start));
		int oSize = ownerString != null ? ownerString.length() : 10;
		out.write(intToByte(oSize));
		out.write(ownerString.getBytes(USER_STRING_ENCODING));
		if (signature != null) {
			out.write((byte) 1);
			signature.writeExternal(out);
		} else {
			out.write((byte) 0);
		}
		out.flush();
		MemoryUtil.immediateSecureBuffers(mBuffer);
	}

	/*
	 * (non-Javadoc)
	 * @see hamaster.gradesgin.ibe.IBEConstraints#readExternal(java.io.InputStream)
	 */
	@Override
	public void readExternal(InputStream in) throws IOException, ClassNotFoundException {
		this.publicParameter = new IBEPublicParameter();
		publicParameter.readExternal(in);
		this.masterKey = new byte[IBE_ZR_SIZE];
		int size = in.read(masterKey);
		if (size != masterKey.length)
			throw new IOException("Not enough bytes for a Certificate");
		byte[] spTmp = new byte[8];
		Arrays.fill(spTmp, (byte) 0);
		if (8 != in.read(spTmp))
			throw new IOException("Not enough bytes for a Certificate");
		long start = bytesToLong(spTmp);
		Arrays.fill(spTmp, (byte) 0);
		if (8 != in.read(spTmp))
			throw new IOException("Not enough bytes for a Certificate");
		long period = bytesToLong(spTmp);
		this.noEarlyThan = new Date(start);
		this.noLateThan = new Date(start + period);
		byte[] sTmp = new byte[4];
		Arrays.fill(sTmp, (byte) 0);
		if (4 != in.read(sTmp))
			throw new IOException("Not enough bytes for a Certificate");
		size = bytesToInt(sTmp);
		byte[] buffer = new byte[size];
		size = in.read(buffer);
		if (size != buffer.length)
			throw new IOException("Not enough bytes for a Certificate");
		this.ownerString = new String(buffer, 0, size, USER_STRING_ENCODING);
		size = in.read();
		if (size == 1) {
			this.signature = new IBSSignature();
			signature.readExternal(in);
		}
	}
}