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本文通过。java语言实现ECC+AES混合加密。ECC加密算法具有密钥分配与管理简单,安全强度高等优点,AES的加密算法具有速度快,强度高,便于实现等优点。Ecc椭圆曲线算法对AES公钥进行加密管理,AES主要为我们数据进行加密。通过集成AES加密算法和ECC加密算法的优点,实现了加密速度快和安全方便管理密钥的优点,有效地解决了密码体制中速度和安全性不能兼顾的问题。JDK中自带了椭圆曲线的签名,但是没有实现椭圆曲线的加密解密。通过引入bouncycastle库实现实现椭圆曲线的加密解密。
www.oracle.com/technetwork…
这个东西。这个是为了解除默认JDK中的加密强度的限制。不使用这个可能会报错。
下载下来以后,需要将local_policy.jar 和 US_export_policy.jar替换掉D:\Program Files\Java\jdk1.8.0_91\jre\lib\security下面的相同的两个jar包。
目录
通过AES获取公钥和私钥
进行ECC加密
基于AES的加密算法具有速度快,强度高,便于实现等优点
ECC加密算法具有密钥分配与管理简单,安全强度高等优点
采用AES加密算法加密大数据块, 而用ECC加密算法管理AES密钥
通过集成AES加密算法和ECC加密算法的优点,实现了加密速度快和安全方便管理密钥的优点,有效地解决了密码体制中速度和安全性不能兼顾的问题.
AES加密标准又称为高级加密标准Rijndael加密法,是美国国家标准技术研究所NIST旨在取代DES的21世纪的加密标准。AES的基本要求是,采用对称分组密码体制,密钥长度可以为128、192或256位,分组长度128位,算法应易在各种硬件和软件上实现。
AES属于对称加密算法;加密、解密使用相同的密钥,AES加解密过程如下图所示:
编辑
package utils;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
public class AESUtil {
//生成AES秘钥,然后Base64编码
public static String genKeyAES() throws Exception{
KeyGenerator keyGen = KeyGenerator.getInstance("AES");
keyGen.init(128);
SecretKey key = keyGen.generateKey();
String base64Str = byte2Base64(key.getEncoded());
return base64Str;
}
//将Base64编码后的AES秘钥转换成SecretKey对象
public static SecretKey loadKeyAES(String base64Key) throws Exception{
byte[] bytes = base642Byte(base64Key);
SecretKeySpec key = new SecretKeySpec(bytes, "AES");
return key;
}
//加密
public static byte[] encryptAES(byte[] source, SecretKey key) throws Exception{
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, key);
return cipher.doFinal(source);
}
//解密
public static byte[] decryptAES(byte[] source, SecretKey key) throws Exception{
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(source);
}
//字节数组转Base64编码
public static String byte2Base64(byte[] bytes){
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(bytes);
}
//Base64编码转字节数组
public static byte[] base642Byte(String base64Key) throws IOException {
BASE64Decoder decoder = new BASE64Decoder();
return decoder.decodeBuffer(base64Key);
}
}
package utils;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Security;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import org.bouncycastle.jce.interfaces.ECPrivateKey;
import org.bouncycastle.jce.interfaces.ECPublicKey;
public class ECCUtil {
static {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
}
//生成秘钥对
public static KeyPair getKeyPair() throws Exception {
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC", "BC");
keyPairGenerator.initialize(256, new SecureRandom());
KeyPair keyPair = keyPairGenerator.generateKeyPair();
return keyPair;
}
//获取公钥(Base64编码)
public static String getPublicKey(KeyPair keyPair){
ECPublicKey publicKey = (ECPublicKey) keyPair.getPublic();
byte[] bytes = publicKey.getEncoded();
return AESUtil.byte2Base64(bytes);
}
//获取私钥(Base64编码)
public static String getPrivateKey(KeyPair keyPair){
ECPrivateKey privateKey = (ECPrivateKey) keyPair.getPrivate();
byte[] bytes = privateKey.getEncoded();
return AESUtil.byte2Base64(bytes);
}
//将Base64编码后的公钥转换成PublicKey对象
public static ECPublicKey string2PublicKey(String pubStr) throws Exception{
byte[] keyBytes = AESUtil.base642Byte(pubStr);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("EC", "BC");
ECPublicKey publicKey = (ECPublicKey) keyFactory.generatePublic(keySpec);
return publicKey;
}
//将Base64编码后的私钥转换成PrivateKey对象
public static ECPrivateKey string2PrivateKey(String priStr) throws Exception{
byte[] keyBytes = AESUtil.base642Byte(priStr);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("EC", "BC");
ECPrivateKey privateKey = (ECPrivateKey) keyFactory.generatePrivate(keySpec);
return privateKey;
}
//公钥加密
public static byte[] publicEncrypt(byte[] content, PublicKey publicKey) throws Exception{
Cipher cipher = Cipher.getInstance("ECIES", "BC");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] bytes = cipher.doFinal(content);
return bytes;
}
//私钥解密
public static byte[] privateDecrypt(byte[] content, PrivateKey privateKey) throws Exception{
Cipher cipher = Cipher.getInstance("ECIES", "BC");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] bytes = cipher.doFinal(content);
return bytes;
}
public static void main(String[] args) throws Exception {
KeyPair keyPair = ECCUtil.getKeyPair();
String publicKeyStr = ECCUtil.getPublicKey(keyPair);
String privateKeyStr = ECCUtil.getPrivateKey(keyPair);
System.out.println("ECC公钥Base64编码:" + publicKeyStr);
System.out.println("ECC私钥Base64编码:" + privateKeyStr);
ECPublicKey publicKey = string2PublicKey(publicKeyStr);
ECPrivateKey privateKey = string2PrivateKey(privateKeyStr);
byte[] publicEncrypt = publicEncrypt("hello world".getBytes(), publicKey);
byte[] privateDecrypt = privateDecrypt(publicEncrypt, privateKey);
System.out.println(new String(privateDecrypt));
}
}