RSA 对称加密，对称解密----公钥私钥加密解密过程
RSA 对称加密，对称解密----公钥私钥加密解密过程（Java）
公司说不能传铭文密码，所以只能加密，再解密；麻烦事，其实这在需求文档没有，开发时间点也没有，浪费了了一上午的时间，还占用了公司给的开发计划时间，搞不好又怪我们偷懒，没按照时间完成；
就自己加了加密解密；
1、公钥就是大家都知道的公开的，私钥就是自己知道，不公开的；所以这里有两种方式1、公钥对明文加密，私钥进行解密；2、私钥对明文加密，公钥进行解密；一下直接贴代码吧；
import org.springframework.util.Base64Utils;
import javax.crypto.Cipher;
import java.net.URLDecoder;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.*;
import org.apache.commons.codec.binary.Base64;
import java.util.concurrent.ConcurrentHashMap;
/**
*
*/
public class RsaUtilClient {
public static final String KEY_ALGORITHM = "RSA";
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
private static final String PUBLIC_KEY = "xxxxxxxxxxxxxxxxxxxxxxxxxx";
private static final String PRIVATE_KEY = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
private static volatile ConcurrentHashMap<String,Key> KEY_MAP = new ConcurrentHashMap<>(2);
private static final String src = "admin4564";
public static void main(String[] args) throws Exception {
//公钥加密私钥解密
String text1 = encryptByPublicKey(PUBLIC_KEY, src);
String text11 = "BSEaCC/B0C9DRxkFXXg1jCuKvsE6TtLhkv3vb/B3WWHBr2uoBci2+WB2ge2ZuBAvU2R5HZCYPvQubCQiioQn0Q==";
String text2 = decryptByPrivateKey(PRIVATE_KEY, text11);
System.out.println(text1);
//私钥加密公钥解密
// String text1 = encryptByPrivateKey(PRIVATE_KEY, src);
/* String text2 = decryptByPublicKey(PUBLIC_KEY, text11);
System.out.println(text2);*/
}
/**
* 公钥加密私钥解密
*/
private static void test1(RSAKeyPair keyPair, String source) throws Exception {
System.out.println("***************** 公钥加密私钥解密开始 *****************");
String text1 = encryptByPublicKey(keyPair.getPublicKey(), source);
String text2 = decryptByPrivateKey(keyPair.getPrivateKey(), text1);
System.out.println("加密前：" + source);
System.out.println("加密后：" + text1);
System.out.println("解密后：" + text2);
if (source.equals(text2)) {
System.out.println("解密字符串和原始字符串一致，解密成功");
} else {
System.out.println("解密字符串和原始字符串不一致，解密失败");
}
System.out.println("***************** 公钥加密私钥解密结束 *****************");
}
/**
* 私钥加密公钥解密
*
* @throws Exception
*/
private static void test2(RSAKeyPair keyPair, String source) throws Exception {
System.out.println("***************** 私钥加密公钥解密开始 *****************");
String text1 = encryptByPrivateKey(keyPair.getPrivateKey(), source);
String text2 = decryptByPublicKey(keyPair.getPublicKey(), text1);
System.out.println("加密前：" + source);
System.out.println("加密后：" + text1);
System.out.println("解密后：" + text2);
if (source.equals(text2)) {
System.out.println("解密字符串和原始字符串一致，解密成功");
} else {
System.out.println("解密字符串和原始字符串不一致，解密失败");
}
System.out.println("***************** 私钥加密公钥解密结束 *****************");
}
/**
* 公钥解密
*
* @param publicKeyText
* @param text
* @return
* @throws Exception
*/
public static String decryptByPublicKey(String publicKeyText, String text) throws Exception {
X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, publicKey);
byte[] result = cipher.doFinal(Base64.decodeBase64(text));
return new String(result);
}
/**
* 私钥加密
*
* @param privateKeyText
* @param text
* @return
* @throws Exception
*/
public static String encryptByPrivateKey(String privateKeyText, String text) throws Exception {
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] result = cipher.doFinal(text.getBytes());
return Base64.encodeBase64String(result);
}
/**
* 私钥解密
*
* @param privateKeyText
* @param text
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String privateKeyText, String text) throws Exception {
PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(PRIVATE_KEY));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] result = cipher.doFinal(Base64.decodeBase64(text));
return new String(result);
}
/**
* 公钥加密
*
* @param publicKeyText
* @param text
* @return
*/
public static String encryptByPublicKey(String publicKeyText, String text) throws Exception {
X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] result = cipher.doFinal(text.getBytes());
return Base64.encodeBase64String(result);
}
/**
* 构建RSA密钥对
*
* @return
* @throws NoSuchAlgorithmException
*/
public static RSAKeyPair generateKeyPair() throws NoSuchAlgorithmException {
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(1024);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
RSAKeyPair rsaKeyPair = new RSAKeyPair(publicKeyString, privateKeyString);
return rsaKeyPair;
}
/**
* RSA密钥对对象
*/
public static class RSAKeyPair {
private String publicKey;
private String privateKey;
public RSAKeyPair(String publicKey, String privateKey) {
this.publicKey = publicKey;
this.privateKey = privateKey;
}
public String getPublicKey() {
return publicKey;
}
public String getPrivateKey() {
return privateKey;
}
}
}
