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Shoulder 提供的协商加密模块，用于非信任网络环境下的安全通信。基于 DH + ECC 实现先进的加密算法协商算法，比传统的 DH + DES 协商算法性能显著更高，更安全。

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package org.shoulder.crypto.negotiation.support.dto;

import org.shoulder.crypto.negotiation.constant.NegotiationConstants;

/**
 * 服务端者返回参数
 * Token = 服务端私钥签名（所有参数拼接）
 *
 * @author lym
 */
public class NegotiationResponse implements Cloneable {

    /**
     * Header 中 会话标识
     */
    private transient String xSessionId;

    /**
     * Header 中 防篡改签名
     */
    private transient String token;

    /**
     * 对方的公钥
     */
    private String publicKey;

    /**
     * 本次会话中，报文的加密方式
     * 一般为对称加密算法，如 AES-256
     */
    private String encryptionScheme;

    /**
     * 算法密钥字节数，注意非 bit 位数，如 256/8=32，192/8=24，128/8=16
     */
    private Integer keyBytesLength = 32;

    /**
     * 多少毫秒之后本次协商过期
     */
    private int expireTime = NegotiationConstants.EXPIRE_TIME;

    public String getXSessionId() {
        return xSessionId;
    }

    public void setXSessionId(String xSessionId) {
        this.xSessionId = xSessionId;
    }

    public String getToken() {
        return token;
    }

    public void setToken(String token) {
        this.token = token;
    }

    public String getPublicKey() {
        return publicKey;
    }

    public void setPublicKey(String publicKey) {
        this.publicKey = publicKey;
    }

    public String getEncryptionScheme() {
        return encryptionScheme;
    }

    public void setEncryptionScheme(String encryptionScheme) {
        this.encryptionScheme = encryptionScheme;
    }

    public Integer getKeyBytesLength() {
        return keyBytesLength;
    }

    public void setKeyBytesLength(Integer keyBytesLength) {
        this.keyBytesLength = keyBytesLength;
    }

    public int getExpireTime() {
        return expireTime;
    }

    public void setExpireTime(int expireTime) {
        this.expireTime = expireTime;
    }

    @Override
    public NegotiationResponse clone() {
        NegotiationResponse cloned = new NegotiationResponse();
        cloned.xSessionId = this.xSessionId;
        cloned.token = this.token;
        cloned.publicKey = this.publicKey;
        cloned.encryptionScheme = this.encryptionScheme;
        cloned.keyBytesLength = this.keyBytesLength;
        cloned.expireTime = this.expireTime;
        return cloned;
    }

}