Java AES256加密解密实现

import it.sauronsoftware.base64.Base64;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
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;

/**
* java实现AES256加密解密
* 依赖说明：
* bcprov-jdk15-133.jar：PKCS7Padding
* javabase64-1.3.1.jar：base64
* local_policy.jar 和 US_export_policy.jar需添加到%JAVE_HOME%\jre\lib\security中（lib中版本适合jdk1.7）
*/

public class AES256 {

public static byte[] encrypt(String content, String password) {
try {
//”AES”：请求的密钥算法的标准名称
KeyGenerator kgen = KeyGenerator.getInstance(“AES”);
//256：密钥生成参数；securerandom：密钥生成器的随机源
SecureRandom securerandom = new SecureRandom(tohash256Deal(password));
kgen.init(256, securerandom);
//生成秘密（对称）密钥
SecretKey secretKey = kgen.generateKey();
//返回基本编码格式的密钥
byte[] enCodeFormat = secretKey.getEncoded();
//根据给定的字节数组构造一个密钥。enCodeFormat：密钥内容；”AES”：与给定的密钥内容相关联的密钥算法的名称
SecretKeySpec key = new SecretKeySpec(enCodeFormat, “AES”);
//将提供程序添加到下一个可用位置
Security.addProvider(new BouncyCastleProvider());
//创建一个实现指定转换的 Cipher对象，该转换由指定的提供程序提供。
//”AES/ECB/PKCS7Padding”：转换的名称；”BC”：提供程序的名称
Cipher cipher = Cipher.getInstance(“AES/ECB/PKCS7Padding”, “BC”);

cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] byteContent = content.getBytes(“utf-8”);
byte[] cryptograph = cipher.doFinal(byteContent);
return Base64.encode(cryptograph);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

public static String decrypt(byte[] cryptograph, String password) {
try {
KeyGenerator kgen = KeyGenerator.getInstance(“AES”);
SecureRandom securerandom = new SecureRandom(tohash256Deal(password));
kgen.init(256, securerandom);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, “AES”);
Security.addProvider(new BouncyCastleProvider());
Cipher cipher = Cipher.getInstance(“AES/ECB/PKCS7Padding”, “BC”);

cipher.init(Cipher.DECRYPT_MODE, key);
byte[] content = cipher.doFinal(Base64.decode(cryptograph));
return new String(content);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

private static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = ‘0’ + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}

/*private static byte[] parseHexStr2Byte(String hexStr) {
if (hexStr.length() < 1)
return null;
byte[] result = new byte[hexStr.length()/2];
for (int i = 0;i< hexStr.length()/2; i++) {
int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
result[i] = (byte) (high * 16 + low);
}
return result;
}*/

private static byte[] tohash256Deal(String datastr) {
try {
MessageDigest digester=MessageDigest.getInstance(“SHA-256”);
digester.update(datastr.getBytes());
byte[] hex=digester.digest();
return hex;
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e.getMessage());
}
}

public static void main(String[] args) {

String content = “0f607264fc6318a92b9e13c65db7cd3c”;
String password = “zsyy”;
System.out.println(“明文：” + content);
System.out.println(“key：” + password);

byte[] encryptResult = AES256.encrypt(content, password);
System.out.println(“密文：” + AES256.parseByte2HexStr(encryptResult));

String decryptResult = AES256.decrypt(encryptResult, password);
System.out.println(“解密：” + decryptResult);
}
}

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