为了保证信息传输的安全性,需要对重要数据进行加密传输,本文提供了java的rsa加密方法供参考。
package test.rsa;
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.Base64;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
public class RSAUtils {
public static final String KEY_ALGORITHM = "RSA";
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
private static final String PUBLIC_KEY = "RSAPublicKey";
private static final String PRIVATE_KEY = "RSAPrivateKey";
private static final int MAX_ENCRYPT_BLOCK = 117;
private static final int MAX_DECRYPT_BLOCK = 128;
/**
* 获得公钥、私钥
*
* @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;
}
/**
* 签名
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) 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(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return Base64.getEncoder().encodeToString(signature.sign());
}
/**
* 验证签名
* @param data
* @param publicKey
* @param sign
* @return
* @throws Exception
*/
public static boolean verify(byte[] data, String publicKey, String sign)
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(SIGNATURE_ALGORITHM);
signature.initVerify(publicK);
signature.update(data);
return signature.verify(Base64.getDecoder().decode(sign));
}
/**
* 私钥解密
*
* @param encryptedData
* @param privateKey
* @return
* @throws Exception
*/
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;
int i = 0;
byte[] cache;
byte[] decryptedData;
try {
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;
}
decryptedData = out.toByteArray();
} catch (Exception e) {
throw e;
} finally {
out.close();
}
return decryptedData;
}
/**
* 公钥加密
*
* @param data
* @param publicKey
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, 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.ENCRYPT_MODE, publicK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
int i = 0;
byte[] cache;
byte[] encryptedData;
try {
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;
}
encryptedData = out.toByteArray();
} catch (Exception e) {
throw e;
} finally {
out.close();
}
return encryptedData;
}
/**
* 获得私钥
*
* @param keyMap
* @return
* @throws Exception
*/
public static String getPrivateKey(final Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return Base64.getEncoder().encodeToString(key.getEncoded());
}
/**
* 获得公钥
*
* @param keyMap
* @return
* @throws Exception
*/
public static String getPublicKey(final Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return Base64.getEncoder().encodeToString(key.getEncoded());
}
}
外面再封装一层。
package test.rsa;
import java.util.Base64;
public class RSADecrypter {
/**
* 私钥解密
* @param encryptedDate
* @param privateKey
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String encryptedDate, String privateKey) throws Exception {
byte[] byte_data = Base64.getDecoder().decode(encryptedDate);
byte[] decryptedData = RSAUtils.decryptByPrivateKey(byte_data, privateKey);
return new String(decryptedData);
}
/**
* 公钥加密
* @param mes
* @param publishKey
* @return
* @throws Exception
*/
public static String encryptByPublishKey(String mes, String publishKey) throws Exception {
byte[] encryptedData = RSAUtils.encryptByPublicKey(mes.getBytes(), publishKey);
return Base64.getEncoder().encodeToString(encryptedData);
}
/**
* 私钥解密
* @param encryptedDate
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String encryptedDate) throws Exception {
return decryptByPrivateKey(encryptedDate, "私钥内容");
}
/**
* 公钥加密
* @param mes
* @return
* @throws Exception
*/
public static String encryptByPublishKey(String mes) throws Exception {
return encryptByPublishKey(mes, "公钥内容");
}
}
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