java RSA 解密
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* @from fhadmin.cn
* @description Rsa 工具类，公钥私钥生成，加解密
* @date 2020-05-18
**/
public class RsaUtils {
private static final String SRC = "123456";
public static void main(String[] args) throws Exception {
System.out.println("\n");
RsaKeyPair keyPair = generateKeyPair();
System.out.println("公钥：" + keyPair.getPublicKey());
System.out.println("私钥：" + keyPair.getPrivateKey());
System.out.println("\n");
test1(keyPair);
System.out.println("\n");
test2(keyPair);
System.out.println("\n");
}
/**
* 公钥加密私钥解密
*/
private static void test1(RsaKeyPair keyPair) throws Exception {
System.out.println("***************** 公钥加密私钥解密开始 *****************");
String text1 = encryptByPublicKey(keyPair.getPublicKey(), RsaUtils.SRC);
String text2 = decryptByPrivateKey(keyPair.getPrivateKey(), text1);
System.out.println("加密前：" + RsaUtils.SRC);
System.out.println("加密后：" + text1);
System.out.println("解密后：" + text2);
if (RsaUtils.SRC.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) throws Exception {
System.out.println("***************** 私钥加密公钥解密开始 *****************");
String text1 = encryptByPrivateKey(keyPair.getPrivateKey(), RsaUtils.SRC);
String text2 = decryptByPublicKey(keyPair.getPublicKey(), text1);
System.out.println("加密前：" + RsaUtils.SRC);
System.out.println("加密后：" + text1);
System.out.println("解密后：" + text2);
if (RsaUtils.SRC.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
* @from fhadmin.cn
* @param publicKeyText 公钥
* @param text 待解密的信息
* @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
* @from fhadmin.cn
* @param privateKeyText 私钥
* @param text 待加密的信息
* @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
* @from fhadmin.cn
* @param privateKeyText 私钥
* @param text 待解密的文本
* @return /
* @throws Exception /
*/
public static String decryptByPrivateKey(String privateKeyText, String text) throws Exception {
PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText));
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
* @from fhadmin.cn
* @param publicKeyText 公钥
* @param text 待加密的文本
* @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
* @from fhadmin.cn
* @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());
return new RsaKeyPair(publicKeyString, privateKeyString);
}
/**
* RSA密钥对对象
*/
public static class RsaKeyPair {
private final String publicKey;
private final String privateKey;
public RsaKeyPair(String publicKey, String privateKey) {
this.publicKey = publicKey;
this.privateKey = privateKey;
}
public String getPublicKey() {
return publicKey;
}
public String getPrivateKey() {
return privateKey;
}
}
}