java通过AES生成公钥加密数据ECC加密公钥
ZhangJiQun_MXP 人气:0成功
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。
- 去JDK的下载页面,下载
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。
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:
通过AES获取公钥和私钥
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); } }
进行ECC加密
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)); } }
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