package com.mandi.common;
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import java.security.KeyFactory;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.SecureRandom;
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import java.security.Signature;
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import java.security.interfaces.DSAPrivateKey;
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import java.security.interfaces.DSAPublicKey;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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import java.util.HashMap;
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import java.util.Map;
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import org.springframework.util.Base64Utils;
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/**
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* @author mengly
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* @version 创建时间：2015年10月27日 下午6:53:16
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* 类说明 :签名
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*/
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public class DSAMethod {
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/**
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* 用私钥对信息生成数字签名
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*
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* @param data
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* 加密数据
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* @param privateKey
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* 私钥
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*
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* @return
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* @throws Exception
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*/
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public static String sign(byte[] data, String privateKey) throws Exception {
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// 解密由base64编码的私钥
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byte[] keyBytes =Base64Utils.decodeFromString(privateKey);
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// 构造PKCS8EncodedKeySpec对象
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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// KEY_ALGORITHM 指定的加密算法
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KeyFactory keyFactory = KeyFactory.getInstance("DSA");
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// 取私钥匙对象
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PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
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// 用私钥对信息生成数字签名
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Signature signature = Signature.getInstance(keyFactory.getAlgorithm());
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signature.initSign(priKey);
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signature.update(data);
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return Base64Utils.encodeToString(signature.sign());
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}
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/**
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* 用私钥对信息生成数字签名
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*
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* @param data
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* 加密数据
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* @param privateKey
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* 私钥
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*
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* @return
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* @throws Exception
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*/
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public static String sign(String content, String privateKey) throws Exception {
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// 解密由base64编码的私钥
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byte[] data=content.getBytes("utf-8");
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byte[] keyBytes =Base64Utils.decodeFromString(privateKey);
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// 构造PKCS8EncodedKeySpec对象
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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// KEY_ALGORITHM 指定的加密算法
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KeyFactory keyFactory = KeyFactory.getInstance("DSA");
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// 取私钥匙对象
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PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
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// 用私钥对信息生成数字签名
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Signature signature = Signature.getInstance(keyFactory.getAlgorithm());
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signature.initSign(priKey);
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signature.update(data);
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return Base64Utils.encodeToString(signature.sign());
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}
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public static boolean verify(String content, String publicKey, String sign)
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throws Exception {
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byte[] data=content.getBytes("utf-8");
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// 解密由base64编码的公钥
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byte[] keyBytes = Base64Utils.decodeFromString(publicKey);
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// 构造X509EncodedKeySpec对象
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
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// ALGORITHM 指定的加密算法
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KeyFactory keyFactory = KeyFactory.getInstance("DSA");
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// 取公钥匙对象
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PublicKey pubKey = keyFactory.generatePublic(keySpec);
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Signature signature = Signature.getInstance(keyFactory.getAlgorithm());
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signature.initVerify(pubKey);
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signature.update(data);
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// 验证签名是否正常
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return signature.verify(Base64Utils.decodeFromString(sign));
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}
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/**
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* 生成密钥
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*
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* @param seed
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* 种子
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* @return 密钥对象
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* @throws Exception
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*/
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public static Map<String, Object> initKey(String seed) throws Exception {
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KeyPairGenerator keygen = KeyPairGenerator.getInstance("DSA");
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// 初始化随机产生器
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SecureRandom secureRandom = new SecureRandom();
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secureRandom.setSeed(seed.getBytes());
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keygen.initialize(1024, secureRandom);
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KeyPair keys = keygen.genKeyPair();
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DSAPublicKey publicKey = (DSAPublicKey) keys.getPublic();
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DSAPrivateKey privateKey = (DSAPrivateKey) keys.getPrivate();
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Map<String, Object> map = new HashMap<String, Object>(2);
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map.put("publicKey", publicKey);
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map.put("privateKey", privateKey);
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return map;
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}
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}
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