09.14 Java AES256加密解密實現

不說別的，直接上代碼：

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實現AES256加密解密
 * 依賴說明：
 * 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中版本適合jdk1.7）
 */
 
public class AES256 {
 
\tpublic static byte[] encrypt(String content, String password) {
\t\ttry {
\t\t\t//"AES"：請求的密鑰算法的標準名稱
\t\t\tKeyGenerator kgen = KeyGenerator.getInstance("AES");
\t\t\t//256：密鑰生成參數；securerandom：密鑰生成器的隨機源
\t\t\tSecureRandom securerandom = new SecureRandom(tohash256Deal(password));
\t\t\tkgen.init(256, securerandom);
\t\t\t//生成秘密（對稱）密鑰
\t\t\tSecretKey secretKey = kgen.generateKey();
\t\t\t//返回基本編碼格式的密鑰
\t\t\tbyte[] enCodeFormat = secretKey.getEncoded();
\t\t\t//根據給定的字節數組構造一個密鑰。enCodeFormat：密鑰內容；"AES"：與給定的密鑰內容相關聯的密鑰算法的名稱
\t\t\tSecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); 

\t\t\t//將提供程序添加到下一個可用位置
\t\t\tSecurity.addProvider(new BouncyCastleProvider());
\t\t\t//創建一個實現指定轉換的 Cipher對象，該轉換由指定的提供程序提供。
\t\t\t//"AES/ECB/PKCS7Padding"：轉換的名稱；"BC"：提供程序的名稱
\t\t\tCipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
 
\t\t\tcipher.init(Cipher.ENCRYPT_MODE, key);
\t\t\tbyte[] byteContent = content.getBytes("utf-8");
\t\t\tbyte[] cryptograph = cipher.doFinal(byteContent);
\t\t\treturn Base64.encode(cryptograph);
\t\t} catch (Exception e) {
\t\t\te.printStackTrace();
\t\t}
\t\treturn null;
\t}
 
\tpublic static String decrypt(byte[] cryptograph, String password) {
\t\ttry {
\t\t\tKeyGenerator kgen = KeyGenerator.getInstance("AES");
\t\t\tSecureRandom securerandom = new SecureRandom(tohash256Deal(password));
\t\t\tkgen.init(256, securerandom);
\t\t\tSecretKey secretKey = kgen.generateKey();
\t\t\tbyte[] enCodeFormat = secretKey.getEncoded();
\t\t\tSecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
\t\t\tSecurity.addProvider(new BouncyCastleProvider());
\t\t\tCipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
 
\t\t\tcipher.init(Cipher.DECRYPT_MODE, key);
\t\t\tbyte[] content = cipher.doFinal(Base64.decode(cryptograph));
\t\t\treturn new String(content);
\t\t} catch (Exception e) {
\t\t\te.printStackTrace();
\t\t}
\t\treturn null;
\t}
 
\tprivate static String parseByte2HexStr(byte buf[]) {
\t\tStringBuffer sb = new StringBuffer();
\t\tfor (int i = 0; i < buf.length; i++) {
\t\t\tString hex = Integer.toHexString(buf[i] & 0xFF);
\t\t\tif (hex.length() == 1) {
\t\t\t\thex = '0' + hex;
\t\t\t}
\t\t\tsb.append(hex.toUpperCase());
\t\t} 

\t\treturn sb.toString();
\t}
 
\t/*private static byte[] parseHexStr2Byte(String hexStr) {
\t\tif (hexStr.length() < 1)
\t\t\treturn null;
\t\tbyte[] result = new byte[hexStr.length()/2];
\t\tfor (int i = 0;i< hexStr.length()/2; i++) {
\t\t\tint high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
\t\t\tint low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
\t\t\tresult[i] = (byte) (high * 16 + low);
\t\t}
\t\treturn result;
\t}*/
\t
\tprivate static byte[] tohash256Deal(String datastr) {
\t\ttry {
\t\t\tMessageDigest digester=MessageDigest.getInstance("SHA-256");
\t\t\tdigester.update(datastr.getBytes());
\t\t\tbyte[] hex=digester.digest();
\t\t\treturn hex; 
\t\t} catch (NoSuchAlgorithmException e) {
\t\t\tthrow new RuntimeException(e.getMessage()); 
\t\t}
\t}
\t
\tpublic static void main(String[] args) {
 
\t\tString content = "0f607264fc6318a92b9e13c65db7cd3c";
\t\tString password = "zsyy";
\t\tSystem.out.println("明文：" + content);
\t\tSystem.out.println("key：" + password);
\t\t
\t\tbyte[] encryptResult = AES256.encrypt(content, password);
\t\tSystem.out.println("密文：" + AES256.parseByte2HexStr(encryptResult));
\t\t
\t\tString decryptResult = AES256.decrypt(encryptResult, password);
\t\tSystem.out.println("解密：" + decryptResult);
\t}
}

運行截圖：