com.alan344happyframework.util.RSAUtils Maven / Gradle / Ivy
package com.alan344happyframework.util;
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.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;
/**
*
* RSA公钥/私钥/签名工具包
*
*
* 罗纳德·李维斯特（Ron [R]ivest）、阿迪·萨莫尔（Adi [S]hamir）和伦纳德·阿德曼（Leonard [A]dleman）
*
*
* 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式
* 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，
* 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全
*
*
* @author IceWee
* @version 1.0
* @date 2012-4-26
*/
public class RSAUtils {
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/**
* 签名算法
*/
public static final String SIGNATURE_ALGORITHM_MD5 = "MD5withRSA";
/**
* SHA1签名算法
*/
public static final String SIGNATURE_ALGORITHM_SHA1 = "SHA1WithRSA";
/**
* 获取公钥的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";
/**
* 获取私钥的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128;
/**
*
* 用私钥生成数字签名
*
*
* @param data 已加密数据
* @param privateKey 私钥(BASE64编码)
* @return str
* @throws Exception e
*/
public static String sign(byte[] data, String privateKey, String signatureAlgorithm) throws Exception {
byte[] keyBytes = Base64.getDecoder().decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(signatureAlgorithm);
signature.initSign(privateK);
signature.update(data);
return Base64.getEncoder().encodeToString(signature.sign());
}
/**
*
* 使用公钥校验数字签名
*
*
* @param data 已加密数据
* @param publicKey 公钥(BASE64编码)
* @param sign 数字签名
* @return true: success
* @throws Exception e
*/
public static boolean verify(byte[] data, String publicKey, String sign, String signatureAlgorithm)
throws Exception {
byte[] keyBytes = Base64.getDecoder().decode(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicK = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(signatureAlgorithm);
signature.initVerify(publicK);
signature.update(data);
return signature.verify(Base64.getDecoder().decode(sign));
}
/**
*
* 私钥解密
*
*
* @param encryptedData 已加密数据
* @param privateKey 私钥(BASE64编码)
* @return 解密后的二进制
* @throws Exception e
*/
public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)
throws Exception {
byte[] keyBytes = Base64.getDecoder().decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
*
* 公钥解密
*
*
* @param encryptedData 已加密数据
* @param publicKey 公钥(BASE64编码)
* @return 解密后的二进制
* @throws Exception e
*/
public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)
throws Exception {
byte[] keyBytes = Base64.getDecoder().decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
*
* 公钥加密
*
*
* @param data 源数据
* @param publicKey 公钥(BASE64编码)
* @return 加密后的二进制
* @throws Exception e
*/
public static byte[] encryptByPublicKey(byte[] data, String publicKey, String algorithm)
throws Exception {
byte[] keyBytes = org.apache.commons.codec.binary.Base64.decodeBase64(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.ENCRYPT_MODE, publicK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* 公钥加密 to String
*
* @param data 待加密数据
* @param publicKey 公钥
* @return 已加密数据
* @throws Exception e
*/
public static String encryptByPublicKeyToString(byte[] data, String publicKey, String algorithm) throws Exception {
return Base64.getEncoder().encodeToString(encryptByPublicKey(data, publicKey, algorithm));
}
/**
*
* 私钥加密
*
*
* @param data 源数据
* @param privateKey 私钥(BASE64编码)
* @return 加密后的二进制
* @throws Exception e
*/
public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
throws Exception {
byte[] keyBytes = org.apache.commons.codec.binary.Base64.decodeBase64((privateKey));
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
// String bytes = Base64.getEncoder().encodeToString(cipher.doFinal(data));
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
*
* 生成密钥对(公钥和私钥)
*
*
* @return map
* @throws Exception e
*/
public static Map genKeyPair() throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map keyMap = new HashMap<>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* 获取私钥
*
*
* @param keyMap 密钥对
* @return 私钥
*/
public static String getPrivateKey(Map keyMap) {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return Base64.getEncoder().encodeToString(key.getEncoded());
}
/**
* 获取公钥
*
*
* @param keyMap 密钥对
* @return 公钥
*/
public static String getPublicKey(Map keyMap) {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return Base64.getEncoder().encodeToString(key.getEncoded());
}
public static void main(String[] args) throws Exception {
// Map objectMap = genKeyPair();
// String privateKey = getPrivateKey(objectMap);
// String publicKey = getPublicKey(objectMap);
// String sign = sign("dd".getBytes(), privateKey, SIGNATURE_ALGORITHM_SHA1);
// String dd1 = Base64.getEncoder().encodeToString(encryptByPrivateKey("dd".getBytes(), privateKey));
// byte[] bytes = encryptByPublicKey("hah".getBytes(), publicKey);
// byte[] bytes1 = decryptByPrivateKey(bytes, privateKey);
// String sd = new String(bytes1);
String publicKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArT82k67xybiJS9AD8nNA\n" +
"euDYdrtCRaxkS6cgs8L9h83eqlDTlrdwzBVSv5V4imTq/URbXn4K0V/KJ1TwDrqO\n" +
"I8hamGB0fvU13WW1NcJuv41RnJVua0QAlS3tS1JzOZpMS9BEGeFvyFF/epbi/m9+\n" +
"lkUWG94FccArNnBtBqqvFncXgQsm98JB3a42NbS1ePP/hMI7Kkz+JNMyYsWkrOUF\n" +
"DCXAbSZkWBJekY4nGZtK1erqGRve8JbxTWirAm/s08rUrjOuZFA21/EI2nea3Did\n" +
"JMTVnXVPY2qcAjF+595shwUKyTjKB8v1REPB3hPF1Z75O6LwuLfyPiCrCTmVoyfq\n" +
"jwIDAQAB";
byte[] bytes = encryptByPublicKey("dsd".getBytes(), publicKey, KEY_ALGORITHM);
}
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