Java AES 256 암호 화 복호화 실현

다른 것 은 말 하지 않 고 코드 를 직접 올 립 니 다.

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  AES256    
 *     ：
 * bcprov-jdk15-133.jar：PKCS7Padding
 * javabase64-1.3.1.jar：base64
 * local_policy.jar   US_export_policy.jar    %JAVE_HOME%\jre\lib\security （lib     jdk1.7）
 */

public class AES256 {

	public static byte[] encrypt(String content, String password) {
		try {
			//"AES"：            
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			//256：      ；securerandom：         
			SecureRandom securerandom = new SecureRandom(tohash256Deal(password));
			kgen.init(256, securerandom);
			//    （  ）  
			SecretKey secretKey = kgen.generateKey();
			//           
			byte[] enCodeFormat = secretKey.getEncoded();
			//               。enCodeFormat：    ；"AES"：                   
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			//               
			Security.addProvider(new BouncyCastleProvider());
			//            Cipher  ，             。
			//"AES/ECB/PKCS7Padding"：     ；"BC"：       
			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("  ：" + content);
		System.out.println("key：" + password);
		
		byte[] encryptResult = AES256.encrypt(content, password);
		System.out.println("  ：" + AES256.parseByte2HexStr(encryptResult));
		
		String decryptResult = AES256.decrypt(encryptResult, password);
		System.out.println("  ：" + decryptResult);
	}
}

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