java代码大全及详解(java非对称加密算法)
我们在做技术接口时，尤其对外提供时，为了提高服务接口的安全（防爆破，防重放，防篡改等）一般会采用接口验证的方式，但是在验证的时候为了提升参数请求前后的安全，我们会采用加密。普通加密基本都是对称的，不能逆向。
下面，我介绍一种RSA的算法，通过这个加密算法实现接口请求前后的数字签名验证。具体实现流程为：
接口数字签名验证的而基本流程
下面我将RSA的签名算法代码分享下，下载即用：
public class RSAEncrypt {
private static Map<Integer, String> keyMap = new HashMap<Integer, String>(); //用于封装随机产生的公钥与私钥
private static String pirvateKey="MIIBUwIBADANBgkqhkiG9w0BAQEFAASCAT0wggE5AgEAAkEAgS8Vf8eKVf9YoqoyhFy4hHgYpNkSkrrmkJrfrKeZHfZWFx2cCoon74QZ3qw15VV9jMD5DWaPdMVAVx5HckNURwIDAQABAkBpS6Fwd4pwMiNi4usuLA1SHDmqFC0pYCISd8odBratTjRv6w9OH+A/CIKDir4DZ0PsS9qh0mxb0bthRQ9vS0wBAiEAx+y2VcrbnOZNQSWUONZcVKIHazkrAWXOBR8mQfJnOUcCIQClavCvg0SesKWv65vs2ZR0quQnaFdcCMh7B4GM2DCNAQIgAsXgvY3jv+hd1/J6fNNUUoQw0Cbp1sofsmh9Mlr3XY8CIFEyGex9Cay/VsTwaLws3PMbgxxY2jDB2u6Q86VX5RUBAiBhoiUOYrxrS77ifDFm1KYFHRPyZNStYJhcVu4U5kwwIA==";
private static String publicKey="MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAIEvFX/HilX/WKKqMoRcuIR4GKTZEpK65pCa36ynmR32VhcdnAqKJ++EGd6sNeVVfYzA+Q1mj3TFQFceR3JDVEcCAwEAAQ==";
private static String ssb="fSAUUCYm3FI3EYJWZRPXnI1dbwcLT3bFUqL5Wsdv24QtLmYmrN2i5WRKQgGxMTewRJ78Obf1Zke9rTpE+23zzw==";
public static void main(String[] args) throws Exception {
//生成公钥和私钥
//genKeyPair();
//String randomStr= RandomStrUtil.getRandom(24, RandomStrUtil.TYPE.LETTER_CAPITAL_NUMBER);
String uuid=UUIDUtil.getUUID();
String hashCode=String.valueOf(uuid.hashCode());
System.out.println("hashcode="+hashCode);
long time=System.currentTimeMillis();
//System.out.println("随机hash"+hashCode);
//加密字符串
String message = time+"@=@"+uuid;
//System.out.println("随机生成的公钥为:" + publicKey);
//System.out.println("随机生成的私钥为:" + pirvateKey);
String messageEn = encrypt(message,publicKey);
System.out.println("加密后的字符串为:" + messageEn);
String messageDe = decrypt(messageEn,pirvateKey);
System.out.println("源文数据="+message);
System.out.println("解密数据=" + messageDe);
String bs=messageDe.split("@=@")[1];
System.out.println(bs);
}
/**
* 随机生成密钥对
* @throws NoSuchAlgorithmException
*/
public static void genKeyPair() throws NoSuchAlgorithmException {
// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
// 初始化密钥对生成器，密钥大小为96-1024位
keyPairGen.initialize(1024,new SecureRandom());
// 生成一个密钥对，保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
// 得到私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// 得到公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
System.out.println("公钥="+publicKeyString);
// 得到私钥字符串
String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
System.out.println("私钥="+privateKeyString);
// 将公钥和私钥保存到Map
//0表示公钥
keyMap.put(0,publicKeyString);
//1表示私钥
keyMap.put(1,privateKeyString);
}
/**
* RSA公钥加密
*
* @param str
* 加密字符串
* @param publicKey
* 公钥
* @return 密文
* @throws Exception
* 加密过程中的异常信息
*/
public static String encrypt( String str, String publicKey ) throws Exception{
//base64编码的公钥
byte[] decoded = Base64.decodeBase64(publicKey);
RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
//RSA加密
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
return outStr;
}
/**
* RSA私钥解密
*
* @param str
* 加密字符串
* @param privateKey
* 私钥
* @return 铭文
* @throws Exception
* 解密过程中的异常信息
*/
public static String decrypt(String str, String privateKey) throws Exception{
//64位解码加密后的字符串
byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
//base64编码的私钥
byte[] decoded = Base64.decodeBase64(privateKey);
RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
//RSA解密
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, priKey);
String outStr = new String(cipher.doFinal(inputByte));
return outStr;
}
}
