Rsa加密类
2024-09-01 10:02:01
需要导入Base64.jar包 import java.io.ByteArrayOutputStream;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
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; import javax.crypto.Cipher; import Decoder.BASE64Decoder;
import Decoder.BASE64Encoder; public class RSACrypt { /**
* 文件读取缓冲区大小
*/
private static final int CACHE_SIZE = 1024; /**
* <p>
* BASE64字符串解码为二进制数据
* </p>
*
* @param base64
* @return
* @throws Exception
*/
public static byte[] decode(String base64) throws Exception {
return new BASE64Decoder().decodeBuffer(base64);
} /**
* <p>
* 二进制数据编码为BASE64字符串
* </p>
*
* @param bytes
* @return
* @throws Exception
*/
public static String encode(byte[] bytes) throws Exception {
return new BASE64Encoder().encode(bytes);
} /**
* 加密算法RSA
*/
// public static final String KEY_ALGORITHM = "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; /**
* <p>
* 生成密钥对(公钥和私钥)
* </p>
*
* @return
* @throws Exception
*/
public static Map<String, Object> 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<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
} /**
* <p>
* 生成密钥对(公钥和私钥)
* </p>
*
* @return
* @throws Exception
*/
public static Map<String, Object> genKeyPair(String seed) throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
// SecureRandom secrand = new SecureRandom();
// secrand.setSeed(seed.getBytes()); // 初始化随机产生器
// keyPairGen.initialize(1024, secrand);
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;
} /**
* <p>
* 用私钥对信息生成数字签名
* </p>
*
* @param data
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
*
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = 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 encode(signature.sign());
} /**
* <p>
* 校验数字签名
* </p>
*
* @param data
* 已加密数据
* @param publicKey
* 公钥(BASE64编码)
* @param sign
* 数字签名
*
* @return
* @throws Exception
*
*/
public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
byte[] keyBytes = 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(decode(sign));
} /**
* <P>
* 私钥解密
* </p>
*
* @param encryptedData
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception {
byte[] keyBytes = 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 cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING"); 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;
} /**
* <p>
* 公钥解密
* </p>
*
* @param encryptedData
* 已加密数据
* @param publicKey
* 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
byte[] keyBytes = 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 cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
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;
} /**
* <p>
* 公钥加密
* </p>
*
* @param data
* 源数据
* @param publicKey
* 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String publicKey) throws Exception {
byte[] keyBytes = 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 cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING"); 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;
} /**
* <p>
* 私钥加密
* </p>
*
* @param data
* 源数据
* @param privateKey
* 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = 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 cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
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;
} /**
* <p>
* 获取私钥
* </p>
*
* @param keyMap
* 密钥对
* @return
* @throws Exception
*/
public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return encode(key.getEncoded());
} /**
* <p>
* 获取公钥
* </p>
*
* @param keyMap
* 密钥对
* @return
* @throws Exception
*/
public static String getPublicKey(Map<String, Object> keyMap) throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return encode(key.getEncoded());
} }
________________________________________
public class Rsademo {
public static void main(String[] args) {
try {
String privateKey = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAKB8GunT65dDzvV4" + "VD6UA9+lGEjIgEtyEVtrp3rEhBRmvOZ1sromkybrAF4ByodHh1BmgBLdImMqMzH2"
+ "vgwc3ioOqiaODqHNPpqa/jeSrdNE/hJSKQqPXi+qVaIg6tOi84GnirHOrwkVxR45" + "kQgj4lH7qnIaMhooaIModIsDTGs7AgMBAAECgYEAg/Jlwlhtu9mRgDslsKnLoYZA"
+ "uB65dM5dPPf/JC4MliV+LFEa2Hg8xmOy0pfQZ3dE5rLPnDLaQgQBQZQn3xehBE/N" + "2YdzLEH1Dpw1eOJY30Qf/Rp6jUaTwY5gQCxSDt24CXpDjzo09dvaR4uHhRNZX1KB"
+ "XNco+PiM7ujFaSrhuBkCQQDQC3d2OhQB4vAaxaPzwqQv6lAFWCR8Osy5jyY/KlVF" + "kd/VzXp2uWACgFm6UXmUwyLfrSpFl013E5SjOsdgpXYNAkEAxXoqed1TYAHHS63N"
+ "oIQlMz/ygHiMtkFeoD8HgKYw5TzYCpqlM++2O1VcbTLjQtnwctIe3B3xF7eOZ1Si" + "53KcZwJAdPaNYhWC3BCnJpYI9+ls/1c/R9HnKUSxhn05Zne5WxSJAB22hPrxRFa+"
+ "m2Zk8ULH33LuehN3RMPoY+CO6QH9HQJBAK9+JrtP7iU2z2a42TEZ3nlSDe8PsnTR" + "WQdtm/w/NNqznIan8cJa+AZ4kH/WplIlneJcSuJwlW3vSNUZSQAIQWcCQHBsB41q"
+ "WyyPcRBjMCR6YO4Iih/07kZJDAqHrdnhea+aNF+MPuShqIGlcDEbdeS1XxUp8gSm" + "diXEh5aJvpTfSEY="; String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCgfBrp0+uXQ871eFQ+lAPfpRhI" + "yIBLchFba6d6xIQUZrzmdbK6JpMm6wBeAcqHR4dQZoAS3SJjKjMx9r4MHN4qDqom"
+ "jg6hzT6amv43kq3TRP4SUikKj14vqlWiIOrTovOBp4qxzq8JFcUeOZEII+JR+6py" + "GjIaKGiDKHSLA0xrOwIDAQAB"; System.out.println("privateKey=" + privateKey);
System.err.println("私钥加密——公钥解密");
String source = "hyx_912_74571852356eb1dd4902f66c9c7ad103e8285d010d27488b";
System.out.println("原文字：\r\n" + source);
byte[] data = source.getBytes();
// byte[] encodedData = RSACrypt.encryptByPrivateKey(data, privateKey);
byte[] encodedData = RSACrypt.encryptByPublicKey(data, publicKey);
String enBaseDate = RSACrypt.encode(encodedData);
System.out.println("加密后：\r\n" + enBaseDate);
// byte[] decryptByPublicKey = RSACrypt.decryptByPublicKey(encodedData, publicKey);
byte[] decryptByPublicKey = RSACrypt.decryptByPrivateKey(encodedData, privateKey);
System.out.println("解密后：\r\n" + new String(decryptByPublicKey));
} catch (Exception e) {
e.printStackTrace();
} }
}
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