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refactor: 优化一下

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taojinlong 2021-10-25 14:48:18 +08:00
parent 54ef74ff4b
commit 042f447286
2 changed files with 240 additions and 0 deletions
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backend/src/main/java/io/dataease/commons/utils/RsaKey.java Normal file
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package io.dataease.commons.utils;
import lombok.Getter;
import lombok.Setter;
@Setter
@Getter
public class RsaKey {
//公钥
private String publicKey;
//私钥
private String privateKey;
}

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backend/src/main/java/io/dataease/commons/utils/RsaUtil.java Normal file
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package io.dataease.commons.utils;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class RsaUtil {
public static final String CHARSET = "UTF-8";
public static final String RSA_ALGORITHM = "RSA";
/**
* 创建RSA 公钥-私钥
*/
public static RsaKey createKeys() throws NoSuchAlgorithmException {
return createKeys(1024);
}
/**
* 创建RSA 公钥-私钥
*/
public static RsaKey createKeys(int keySize) throws NoSuchAlgorithmException {
//为RSA算法创建一个KeyPairGenerator对象
KeyPairGenerator kpg = KeyPairGenerator.getInstance(RSA_ALGORITHM);
//初始化KeyPairGenerator对象,密钥长度
kpg.initialize(keySize);
//生成密匙对
KeyPair keyPair = kpg.generateKeyPair();
//得到公钥
Key publicKey = keyPair.getPublic();
String publicKeyStr = new String(Base64.encodeBase64(publicKey.getEncoded()));
//得到私钥
Key privateKey = keyPair.getPrivate();
String privateKeyStr = new String(Base64.encodeBase64(privateKey.getEncoded()));
RsaKey rsaKey = new RsaKey();
rsaKey.setPublicKey(publicKeyStr);
rsaKey.setPrivateKey(privateKeyStr);
return rsaKey;
}
/**
* 公钥加密
*
* @param originalText 原文
* @param publicKey 公钥
*/
public static String publicEncrypt(String originalText, String publicKey) throws NoSuchAlgorithmException {
RSAPublicKey rsaPublicKey = getPublicKey(publicKey);
return publicEncrypt(originalText, rsaPublicKey);
}
/**
* 公钥解密
*
* @param cipherText 密文
* @param publicKey 公钥
*/
public static String publicDecrypt(String cipherText, String publicKey) throws NoSuchAlgorithmException {
RSAPublicKey rsaPublicKey = getPublicKey(publicKey);
return publicDecrypt(cipherText, rsaPublicKey);
}
/**
* 私钥加密
*
* @param originalText 原文
* @param privateKey 私钥
*/
public static String privateEncrypt(String originalText, String privateKey) throws NoSuchAlgorithmException {
RSAPrivateKey rsaPrivateKey = getPrivateKey(privateKey);
return privateEncrypt(originalText, rsaPrivateKey);
}
/**
* 私钥解密
*
* @param cipherText 密文
* @param privateKey 私钥
*/
public static String privateDecrypt(String cipherText, String privateKey) throws NoSuchAlgorithmException {
RSAPrivateKey rsaPrivateKey = getPrivateKey(privateKey);
return privateDecrypt(cipherText, rsaPrivateKey);
}
/**
* 得到公钥
*
* @param publicKey 密钥字符串（经过base64编码）
*/
private static RSAPublicKey getPublicKey(String publicKey) throws NoSuchAlgorithmException {
//通过X509编码的Key指令获得公钥对象
KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKey));
RSAPublicKey key = null;
try {
key = (RSAPublicKey) keyFactory.generatePublic(x509KeySpec);
} catch (InvalidKeySpecException e) {
e.printStackTrace();
}
return key;
}
/**
* 公钥加密
*
* @param originalText 原文
* @param publicKey 公钥
*/
private static String publicEncrypt(String originalText, RSAPublicKey publicKey) {
try {
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return Base64.encodeBase64URLSafeString(rsaSplitCodec(cipher, Cipher.ENCRYPT_MODE, originalText.getBytes(CHARSET), publicKey.getModulus().bitLength()));
} catch (Exception e) {
throw new RuntimeException("加密字符串[" + originalText + "]时遇到异常", e);
}
}
/**
* 得到私钥
*
* @param privateKey 密钥字符串（经过base64编码）
*/
private static RSAPrivateKey getPrivateKey(String privateKey) throws NoSuchAlgorithmException {
//通过PKCS#8编码的Key指令获得私钥对象
KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKey));
RSAPrivateKey key = null;
try {
key = (RSAPrivateKey) keyFactory.generatePrivate(pkcs8KeySpec);
} catch (InvalidKeySpecException e) {
e.printStackTrace();
}
return key;
}
/**
* 私钥解密
*
* @param cipherText 密文
* @param privateKey 私钥
*/
private static String privateDecrypt(String cipherText, RSAPrivateKey privateKey) {
try {
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return new String(rsaSplitCodec(cipher, Cipher.DECRYPT_MODE, Base64.decodeBase64(cipherText), privateKey.getModulus().bitLength()), CHARSET);
} catch (Exception e) {
throw new RuntimeException("解密字符串[" + cipherText + "]时遇到异常", e);
}
}
private static String privateEncrypt(String originalText, RSAPrivateKey privateKey) {
try {
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
return Base64.encodeBase64URLSafeString(rsaSplitCodec(cipher, Cipher.ENCRYPT_MODE, originalText.getBytes(CHARSET), privateKey.getModulus().bitLength()));
} catch (Exception e) {
throw new RuntimeException("加密字符串[" + originalText + "]时遇到异常", e);
}
}
private static String publicDecrypt(String cipherText, RSAPublicKey publicKey) {
try {
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, publicKey);
return new String(rsaSplitCodec(cipher, Cipher.DECRYPT_MODE, Base64.decodeBase64(cipherText), publicKey.getModulus().bitLength()), CHARSET);
} catch (Exception e) {
throw new RuntimeException("解密字符串[" + cipherText + "]时遇到异常", e);
}
}
private static byte[] rsaSplitCodec(Cipher cipher, int opmode, byte[] datas, int keySize) {
int maxBlock;
if (opmode == Cipher.DECRYPT_MODE) {
maxBlock = keySize / 8;
} else {
maxBlock = keySize / 8 - 11;
}
int offSet = 0;
byte[] buff;
int i = 0;
try (
ByteArrayOutputStream out = new ByteArrayOutputStream()
) {
while (datas.length > offSet) {
if (datas.length - offSet > maxBlock) {
buff = cipher.doFinal(datas, offSet, maxBlock);
} else {
buff = cipher.doFinal(datas, offSet, datas.length - offSet);
}
out.write(buff, 0, buff.length);
i++;
offSet = i * maxBlock;
}
return out.toByteArray();
} catch (Exception e) {
throw new RuntimeException("加解密阀值为[" + maxBlock + "]的数据时发生异常", e);
}
}
}