增加Rsa加密方法
This commit is contained in:
parent
4d08282c8f
commit
2d0a21e70e
207
basic-util/src/main/java/ink/wgink/util/security/RsaUtil.java
Normal file
207
basic-util/src/main/java/ink/wgink/util/security/RsaUtil.java
Normal file
@ -0,0 +1,207 @@
|
||||
package ink.wgink.util.security;
|
||||
|
||||
import org.springframework.util.Base64Utils;
|
||||
|
||||
import javax.crypto.BadPaddingException;
|
||||
import javax.crypto.Cipher;
|
||||
import javax.crypto.IllegalBlockSizeException;
|
||||
import java.io.ByteArrayOutputStream;
|
||||
import java.io.IOException;
|
||||
import java.nio.charset.StandardCharsets;
|
||||
import java.security.*;
|
||||
import java.security.interfaces.RSAKey;
|
||||
import java.security.interfaces.RSAPrivateKey;
|
||||
import java.security.interfaces.RSAPublicKey;
|
||||
import java.security.spec.PKCS8EncodedKeySpec;
|
||||
import java.security.spec.X509EncodedKeySpec;
|
||||
|
||||
/**
|
||||
* @ClassName: RsaUtil
|
||||
* @Description: Rsa工具
|
||||
* @Author: wanggeng
|
||||
* @Date: 2022/9/2 15:00
|
||||
* @Version: 1.0
|
||||
*/
|
||||
public class RsaUtil {
|
||||
|
||||
private static final String RSA_ALGORITHM = "RSA";
|
||||
|
||||
/**
|
||||
* 公钥加密
|
||||
**/
|
||||
public static byte[] encryptWithPublicKey(final byte[] data, RSAPublicKey publicKey) {
|
||||
return doRSA(publicKey, Cipher.ENCRYPT_MODE, data);
|
||||
}
|
||||
|
||||
/**
|
||||
* 公钥解密
|
||||
**/
|
||||
public static byte[] decryptByPublicKey(final byte[] data, RSAPublicKey publicKey) {
|
||||
return doRSA(publicKey, Cipher.DECRYPT_MODE, data);
|
||||
}
|
||||
|
||||
/**
|
||||
* 私钥加密
|
||||
**/
|
||||
public static byte[] encryptWithPrivateKey(byte[] data, RSAPrivateKey privateKey) {
|
||||
return doRSA(privateKey, Cipher.ENCRYPT_MODE, data);
|
||||
}
|
||||
|
||||
/**
|
||||
* 私钥解密
|
||||
**/
|
||||
public static byte[] decryptWithPrivateKey(byte[] data, RSAPrivateKey privateKey) {
|
||||
return doRSA(privateKey, Cipher.DECRYPT_MODE, data);
|
||||
}
|
||||
|
||||
|
||||
private static byte[] doRSA(RSAKey key, int mode, byte[] data) {
|
||||
try {
|
||||
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
|
||||
cipher.init(mode, (Key) key);
|
||||
return doRSA(cipher, mode, data, key.getModulus().bitLength());
|
||||
} catch (Exception e) {
|
||||
throw new IllegalArgumentException(e);
|
||||
}
|
||||
}
|
||||
|
||||
private static byte[] doRSA(Cipher cipher, int mode, byte[] data, int keySize) throws IOException, BadPaddingException, IllegalBlockSizeException {
|
||||
int maxBlock;
|
||||
if (mode == Cipher.DECRYPT_MODE) {
|
||||
maxBlock = keySize / 8;
|
||||
} else {
|
||||
maxBlock = keySize / 8 - 11;
|
||||
}
|
||||
int length = data.length;
|
||||
ByteArrayOutputStream baos = new ByteArrayOutputStream();
|
||||
try {
|
||||
int offset = 0;
|
||||
byte[] buf;
|
||||
int i = 0;
|
||||
// 对数据分段加密
|
||||
while (length - offset > 0) {
|
||||
if (length - offset > maxBlock) {
|
||||
buf = cipher.doFinal(data, offset, maxBlock);
|
||||
} else {
|
||||
buf = cipher.doFinal(data, offset, length - offset);
|
||||
}
|
||||
baos.write(buf, 0, buf.length);
|
||||
i++;
|
||||
offset = i * maxBlock;
|
||||
}
|
||||
baos.flush();
|
||||
return baos.toByteArray();
|
||||
} finally {
|
||||
baos.close();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 创建公钥
|
||||
*
|
||||
* @param publicKey
|
||||
* @return
|
||||
*/
|
||||
public static RSAPublicKey generatePublicKey(String publicKey) {
|
||||
try {
|
||||
KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);
|
||||
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64Utils.decodeFromString(publicKey));
|
||||
return (RSAPublicKey) keyFactory.generatePublic(x509KeySpec);
|
||||
} catch (Exception e) {
|
||||
throw new IllegalArgumentException("generate publicKey caught error", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 创建私钥
|
||||
*
|
||||
* @param privateKey
|
||||
* @return
|
||||
*/
|
||||
public static RSAPrivateKey generatePrivateKey(String privateKey) {
|
||||
try {
|
||||
KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);
|
||||
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64Utils.decodeFromString(privateKey));
|
||||
return (RSAPrivateKey) keyFactory.generatePrivate(pkcs8KeySpec);
|
||||
} catch (Exception e) {
|
||||
throw new IllegalArgumentException("generate privateKey caught error", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取公钥字符串
|
||||
*
|
||||
* @param publicKey
|
||||
* @return
|
||||
*/
|
||||
public static String getPublicKeyString(PublicKey publicKey) {
|
||||
return Base64Utils.encodeToString(publicKey.getEncoded());
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取私钥字符串
|
||||
*
|
||||
* @param privateKey
|
||||
* @return
|
||||
*/
|
||||
public static String getPrivateKeyString(PrivateKey privateKey) {
|
||||
return Base64Utils.encodeToString(privateKey.getEncoded());
|
||||
}
|
||||
|
||||
/**
|
||||
* 生成公私钥对
|
||||
*
|
||||
* @return
|
||||
* @throws NoSuchAlgorithmException
|
||||
*/
|
||||
public static KeyPair generateKeyPair(int keySize) throws NoSuchAlgorithmException {
|
||||
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(RSA_ALGORITHM);
|
||||
keyPairGenerator.initialize(keySize);
|
||||
return keyPairGenerator.genKeyPair();
|
||||
}
|
||||
|
||||
public static void main(String[] args) throws NoSuchAlgorithmException {
|
||||
KeyPair keyPair = RsaUtil.generateKeyPair(512);
|
||||
PublicKey pubKey = keyPair.getPublic();
|
||||
PrivateKey priKey = keyPair.getPrivate();
|
||||
|
||||
String publicKey = RsaUtil.getPublicKeyString(pubKey);
|
||||
String privateKey = RsaUtil.getPrivateKeyString(priKey);
|
||||
|
||||
System.out.println("公钥：" + publicKey);
|
||||
System.out.println("私钥：" + privateKey);
|
||||
|
||||
System.out.println();
|
||||
|
||||
String content = "站在大明门前守卫的禁卫军，事先没有接到有关的命令。hello world!";
|
||||
byte[] data = content.getBytes(StandardCharsets.UTF_8);
|
||||
|
||||
System.out.println("明文：" + content);
|
||||
System.out.println("明文大小：" + data.length);
|
||||
|
||||
//公钥加密
|
||||
byte[] encodeBuf = RsaUtil.encryptWithPublicKey(data, RsaUtil.generatePublicKey(publicKey));
|
||||
System.out.println("密文：" + Base64Utils.encodeToString(encodeBuf));
|
||||
System.out.println("密文大小：" + encodeBuf.length);
|
||||
|
||||
//私钥解密
|
||||
byte[] decodeBuf = RsaUtil.decryptWithPrivateKey(encodeBuf, RsaUtil.generatePrivateKey(privateKey));
|
||||
System.out.println("解密后文字：" + new String(decodeBuf, StandardCharsets.UTF_8));
|
||||
|
||||
// 私钥加密
|
||||
System.out.println();
|
||||
|
||||
String content2 = "我是中国人";
|
||||
byte[] data2 = content2.getBytes(StandardCharsets.UTF_8);
|
||||
System.out.println("明文：" + content2);
|
||||
// 私钥加密
|
||||
byte[] privateEncodeBuf = RsaUtil.encryptWithPrivateKey(data2, RsaUtil.generatePrivateKey(privateKey));
|
||||
System.out.println("密文：" + Base64Utils.encodeToString(privateEncodeBuf));
|
||||
System.out.println("密文大小：" + privateEncodeBuf.length);
|
||||
// 公钥解密
|
||||
byte[] publicDecodeBuf = RsaUtil.decryptByPublicKey(privateEncodeBuf, RsaUtil.generatePublicKey(publicKey));
|
||||
System.out.println("解密后文字：" + new String(publicDecodeBuf, StandardCharsets.UTF_8));
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user