标签：java 对称加密
对称加密
1.特点
加密密钥与解密密钥相同
2.分类
2.1 DES
2.2 3DES
2.3 AES
2.4 PBE
3.各种加密示例
3.1 DES
import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import org.apache.commons.codec.binary.Hex;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class DES
{
public static void main(String[] args) throws Exception
{
getJkdDes("测试 test");
getBCDes("测试 test");
}
public static void getJkdDes(String src) throws Exception
{
// KEY的生成器
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56); // 密钥长度
// 生成KEY
SecretKey generateKey = keyGenerator.generateKey();
byte[] encodedKey = generateKey.getEncoded();
// KEY的转换
DESKeySpec desKeySpec = new DESKeySpec(encodedKey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
Key convertSecretKey = factory.generateSecret(desKeySpec);
// 加密
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);
byte[] bytes = src.getBytes();
byte[] result = cipher.doFinal(bytes);
System.out.println("jkd des encrypt : " + Hex.encodeHexString(result));
// 解密
cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
result = cipher.doFinal(result);
System.out.println("jkd des decrypt : " + new String(result));
}
public static void getBCDes(String src) throws Exception
{
// 增加一个BC的provider
Security.addProvider(new BouncyCastleProvider());
// KEY的生成器
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES","BC");
keyGenerator.getProvider();// 获取当前的加密provider SunJCE version 1.7
keyGenerator.init(56);
// 生成KEY
SecretKey generateKey = keyGenerator.generateKey();
byte[] encodedKey = generateKey.getEncoded();
// KEY的转换
DESKeySpec desKeySpec = new DESKeySpec(encodedKey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
Key convertSecretKey = factory.generateSecret(desKeySpec);
// 加密
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);
byte[] bytes = src.getBytes();
byte[] result = cipher.doFinal(bytes);
System.out.println("bc des encrypt : " + Hex.encodeHexString(result));
// 解密
cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
result = cipher.doFinal(result);
System.out.println("bc des decrypt : " + new String(result));
}
}
3.2 3DES
import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import org.apache.commons.codec.binary.Hex;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class Securty3DES
{
public static void main(String[] args) throws Exception
{
getJkd3Des("测试 test");
getBC3Des("测试 test");
}
public static void getJkd3Des(String src) throws Exception
{
// KEY的生成器
KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
// keyGenerator.init(168);
keyGenerator.init(new SecureRandom()); // 根据加密算法自动初始化默认长度
// 生成KEY
SecretKey generateKey = keyGenerator.generateKey();
byte[] encodedKey = generateKey.getEncoded();
// KEY的转换
DESedeKeySpec desKeySpec = new DESedeKeySpec(encodedKey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
Key convertSecretKey = factory.generateSecret(desKeySpec);
System.out.println(Hex.encodeHexString(convertSecretKey.getEncoded()));
// 加密
Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);
byte[] bytes = src.getBytes();
byte[] result = cipher.doFinal(bytes);
System.out.println("jkd 3des encrypt : " + Hex.encodeHexString(result));
// 解密
cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
result = cipher.doFinal(result);
System.out.println("jkd 3des decrypt : " + new String(result));
}
public static void getBC3Des(String src) throws Exception
{
// 增加一个BC的provider
Security.addProvider(new BouncyCastleProvider());
// KEY的生成器
KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede","BC");
// keyGenerator.init(168);
keyGenerator.init(new SecureRandom());
// 生成KEY
SecretKey generateKey = keyGenerator.generateKey();
byte[] encodedKey = generateKey.getEncoded();
// KEY的转换
DESedeKeySpec desKeySpec = new DESedeKeySpec(encodedKey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
Key convertSecretKey = factory.generateSecret(desKeySpec);
// 加密
Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);
byte[] bytes = src.getBytes();
byte[] result = cipher.doFinal(bytes);
System.out.println("jkd 3des encrypt : " + Hex.encodeHexString(result));
// 解密
cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
result = cipher.doFinal(result);
System.out.println("jkd 3des decrypt : " + new String(result));
}
}
3.3 AES
import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Base64;
public class AES
{
public static void main(String[] args) throws Exception
{
getJdkAes("测试 test");
getBCAes("测试 test");
}
public static void getJdkAes(String src) throws Exception
{
// 生成key的生成器
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(new SecureRandom());
SecretKey generateKey = keyGenerator.generateKey();
byte[] keyBytes = generateKey.getEncoded();
// key的转换
Key key = new SecretKeySpec(keyBytes, "AES");
// 加密
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("jdk aec encrypt : " + Base64.toBase64String(result));
// 解密
cipher.init(Cipher.DECRYPT_MODE, key);
result = cipher.doFinal(result);
System.out.println("jdk aec decrypt : " + new String(result));
}
public static void getBCAes(String src) throws Exception
{
Security.addProvider(new BouncyCastleProvider());
// 生成key的生成器
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES","BC");
keyGenerator.init(128);
SecretKey generateKey = keyGenerator.generateKey();
byte[] keyBytes = generateKey.getEncoded();
// key的转换
Key key = new SecretKeySpec(keyBytes, "AES");
// 加密
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("jdk aec encrypt : " + Base64.toBase64String(result));
// 解密
cipher.init(Cipher.DECRYPT_MODE, key);
result = cipher.doFinal(result);
System.out.println("jdk aec decrypt : " + new String(result));
}
}
3.4 PBE
import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Base64;
public class PBE
{
public static void main(String[] args) throws Exception
{
getJkdPBE("测试 test");
getBCPBE("测试 test");
}
public static void getJkdPBE(String src) throws Exception
{
// 初始化盐
SecureRandom secureRandom = new SecureRandom();
byte[] salt = secureRandom.generateSeed(8);
// 生成口令密钥
String password = "yyc";
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
Key key = secretKeyFactory.generateSecret(pbeKeySpec);
// 加密
PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, 100);
Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
cipher.init(Cipher.ENCRYPT_MODE, key, parameterSpec);
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("jkd peb encrypt : " + Base64.toBase64String(result));
// 解密
cipher.init(Cipher.DECRYPT_MODE, key, parameterSpec);
result = cipher.doFinal(result);
System.out.println("jkd peb decrypt : " + new String(result));
}
public static void getBCPBE(String src) throws Exception
{
Security.addProvider(new BouncyCastleProvider());
// 初始化盐
SecureRandom secureRandom = new SecureRandom();
byte[] salt = secureRandom.generateSeed(8);
// 生成口令密钥
String password = "yyc";
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBEWITHMD5andDES","BC");
Key key = secretKeyFactory.generateSecret(pbeKeySpec);
// 加密
PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, 100);
Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
cipher.init(Cipher.ENCRYPT_MODE, key, parameterSpec);
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("BC peb encrypt : " + Base64.toBase64String(result));
// 解密
cipher.init(Cipher.DECRYPT_MODE, key, parameterSpec);
result = cipher.doFinal(result);
System.out.println("BC peb decrypt : " + new String(result));
}
}
标签：java 对称加密
原文地址：http://881206524.blog.51cto.com/10315134/1846113
