263 lines
9.3 KiB
Java
263 lines
9.3 KiB
Java
package cn.palmte.work.utils;
|
||
|
||
|
||
|
||
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.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 = "MD5withRSA";
|
||
|
||
/**
|
||
* 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;
|
||
|
||
static String publicKey;
|
||
static String privateKey;
|
||
|
||
/**
|
||
* 生成密钥对(公钥和私钥)
|
||
*/
|
||
public static Map<String, Object> genKeyPair() throws Exception {
|
||
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
|
||
keyPairGen.initialize(512);
|
||
KeyPair keyPair = keyPairGen.generateKeyPair();
|
||
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
|
||
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
|
||
Map<String, Object> keyMap = new HashMap<String, Object>(2);
|
||
keyMap.put(PUBLIC_KEY, publicKey);
|
||
keyMap.put(PRIVATE_KEY, privateKey);
|
||
return keyMap;
|
||
}
|
||
|
||
/**
|
||
* 用私钥对信息生成数字签名
|
||
*
|
||
* @param data 已加密数据
|
||
* @param privateKey 私钥(BASE64编码)
|
||
*/
|
||
public static String sign(byte[] data, String privateKey) throws Exception {
|
||
byte[] keyBytes = Base64Utils.decode(privateKey);
|
||
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
|
||
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
||
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
|
||
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
|
||
signature.initSign(privateK);
|
||
signature.update(data);
|
||
return Base64Utils.encode(signature.sign());
|
||
}
|
||
|
||
/**
|
||
* 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
|
||
*/
|
||
public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
|
||
byte[] keyBytes = Base64Utils.decode(publicKey);
|
||
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
|
||
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
||
PublicKey publicK = keyFactory.generatePublic(keySpec);
|
||
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
|
||
signature.initVerify(publicK);
|
||
signature.update(data);
|
||
return signature.verify(Base64Utils.decode(sign));
|
||
}
|
||
|
||
/**
|
||
* 私钥解密
|
||
*
|
||
* @param encryptedData 已加密数据
|
||
* @param privateKey 私钥(BASE64编码)
|
||
*/
|
||
public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception {
|
||
byte[] keyBytes = Base64Utils.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)
|
||
*/
|
||
public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
|
||
byte[] keyBytes = Base64Utils.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)
|
||
*/
|
||
public static byte[] encryptByPublicKey(byte[] data, String publicKey) throws Exception {
|
||
byte[] keyBytes = Base64Utils.decode(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(keyFactory.getAlgorithm());
|
||
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;
|
||
}
|
||
|
||
/**
|
||
* @param data 源数据
|
||
* @param privateKey 私钥(BASE64编码)
|
||
*/
|
||
public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception {
|
||
byte[] keyBytes = Base64Utils.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.ENCRYPT_MODE, privateK);
|
||
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;
|
||
}
|
||
|
||
/**
|
||
* 获取私钥
|
||
* @param keyMap 密钥对
|
||
*/
|
||
public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
|
||
Key key = (Key) keyMap.get(PRIVATE_KEY);
|
||
return Base64Utils.encode(key.getEncoded());
|
||
}
|
||
|
||
/**
|
||
* 获取公钥
|
||
*
|
||
* @param keyMap 密钥对
|
||
*/
|
||
public static String getPublicKey(Map<String, Object> keyMap) throws Exception {
|
||
Key key = (Key) keyMap.get(PUBLIC_KEY);
|
||
return Base64Utils.encode(key.getEncoded());
|
||
}
|
||
}
|