参考文章：AES加密解密（ECB模式）
工具：在线AES加密解密
使用固定的key
package com.eshore.cloud.utils;import android.text.TextUtils;import android.util.Base64;import java.security.Provider;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;public class AesUtil {//偏移量public static final String VIPARA = "XXX"; //AES 为16位. DES 为8bytes//AES是加密方式 CBC是工作模式 PKCS5Padding是填充模式private static final String CBC_PKCS5_PADDING = "AES/CBC/PKCS5Padding";//AES 加密private static final String AES = "AES";// SHA1PRNG 强随机种子算法, 要区别4.2以上版本的调用方法private static final String SHA1PRNG = "SHA1PRNG";//编码方式public static final String CODE_TYPE = "UTF-8";/*** 加密** @param key* @param cleartext* @return*/public static String encrypt(String key, String cleartext) {if (TextUtils.isEmpty(cleartext)) {return cleartext;}try {byte[] result = encrypt(key, cleartext.getBytes(CODE_TYPE));return new String(Base64.encode(result, Base64.NO_WRAP),CODE_TYPE);} catch (Exception e) {e.printStackTrace();}return null;}public static byte[] encrypt(String key, byte[] clear) throws Exception {IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes(CODE_TYPE));/*byte[] raw = getRawKey(key.getBytes("utf-8"));SecretKeySpec skeySpec = new SecretKeySpec(raw, AES);*/byte[] raw = key.getBytes(CODE_TYPE);SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);cipher.init(Cipher.ENCRYPT_MODE, skeySpec, zeroIv);byte[] encrypted = cipher.doFinal(clear);return encrypted;}/*** 解密** @param key* @param encrypted* @return*/public static String decrypt(String key, String encrypted) {if (TextUtils.isEmpty(encrypted)) {return encrypted;}try {byte[] enc = Base64.decode(encrypted.getBytes(CODE_TYPE), Base64.NO_WRAP);byte[] result = decrypt(key, enc);return new String(result);} catch (Exception e) {e.printStackTrace();}return null;}public static byte[] decrypt(String key, byte[] encrypted) throws Exception {IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes(CODE_TYPE));/* byte[] raw = getRawKey(key.getBytes());SecretKeySpec skeySpec = new SecretKeySpec(raw, AES);*/byte[] raw = key.getBytes(CODE_TYPE);SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);cipher.init(Cipher.DECRYPT_MODE, skeySpec, zeroIv);byte[] decrypted = cipher.doFinal(encrypted);return decrypted;}}
使用动态的key:
Android使用AES加密和解密
package com.iefeel.tool;import android.text.TextUtils;import android.util.Base64;import java.security.Provider;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;public class AesUtil {private final static String HEX = "0123456789ABCDEF";//AES是加密方式 CBC是工作模式 PKCS5Padding是填充模式private static final String CBC_PKCS5_PADDING = "AES/CBC/PKCS5Padding";//AES 加密private static final String AES = "AES";// SHA1PRNG 强随机种子算法, 要区别4.2以上版本的调用方法private static final String SHA1PRNG = "SHA1PRNG";/*** @return 动态生成秘钥*/public static String generateKey() {try {SecureRandom localSecureRandom = SecureRandom.getInstance(SHA1PRNG);byte[] bytes_key = new byte[20];localSecureRandom.nextBytes(bytes_key);String str_key = toHex(bytes_key);return str_key;} catch (Exception e) {e.printStackTrace();}return null;}/*** 对秘钥进行处理** @param seed 动态生成的秘钥* @return* @throws Exception*/private static byte[] getRawKey(byte[] seed) throws Exception {KeyGenerator kgen = KeyGenerator.getInstance(AES);//for androidSecureRandom sr = null;// 在4.2以上版本中，SecureRandom获取方式发生了改变int sdk_version = android.os.Build.VERSION.SDK_INT;// Android 6.0 以上if (sdk_version > 23) {sr = SecureRandom.getInstance(SHA1PRNG, new CryptoProvider());//4.2及以上} else if (android.os.Build.VERSION.SDK_INT >= 17) {sr = SecureRandom.getInstance(SHA1PRNG, "Crypto");} else {sr = SecureRandom.getInstance(SHA1PRNG);}// for Java// secureRandom = SecureRandom.getInstance(SHA1PRNG);sr.setSeed(seed);//256 bits or 128 bits,192bitskgen.init(128, sr);//AES中128位密钥版本有10个加密循环，192比特密钥版本有12个加密循环，256比特密钥版本则有14个加密循环。SecretKey skey = kgen.generateKey();byte[] raw = skey.getEncoded();return raw;}/*** 加密** @param key* @param cleartext* @return*/public static String encrypt(String key, String cleartext) {if (TextUtils.isEmpty(cleartext)) {return cleartext;}try {byte[] result = encrypt(key, cleartext.getBytes());return new String(Base64.encode(result, Base64.DEFAULT));} catch (Exception e) {e.printStackTrace();}return null;}private static byte[] encrypt(String key, byte[] clear) throws Exception {byte[] raw = getRawKey(key.getBytes());SecretKeySpec skeySpec = new SecretKeySpec(raw, AES);Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));byte[] encrypted = cipher.doFinal(clear);return encrypted;}/*** 解密** @param key* @param encrypted* @return*/public static String decrypt(String key, String encrypted) {if (TextUtils.isEmpty(encrypted)) {return encrypted;}try {byte[] enc = Base64.decode(encrypted, Base64.DEFAULT);byte[] result = decrypt(key, enc);return new String(result);} catch (Exception e) {e.printStackTrace();}return null;}private static byte[] decrypt(String key, byte[] encrypted) throws Exception {byte[] raw = getRawKey(key.getBytes());SecretKeySpec skeySpec = new SecretKeySpec(raw, AES);Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));byte[] decrypted = cipher.doFinal(encrypted);return decrypted;}// ----------------------------------------------- 辅助方法 ------------------------------------//二进制转字符public static String toHex(byte[] buf) {if (buf == null)return "";StringBuffer result = new StringBuffer(2 * buf.length);for (int i = 0; i < buf.length; i++) {appendHex(result, buf[i]);}return result.toString();}private static void appendHex(StringBuffer sb, byte b) {sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));}// 增加 CryptoProvider 类public static class CryptoProvider extends Provider {/*** Creates a Provider and puts parameters*/public CryptoProvider() {super("Crypto", 1.0, "HARMONY (SHA1 digest; SecureRandom; SHA1withDSA signature)");put("SecureRandom.SHA1PRNG","org.apache.harmony.security.provider.crypto.SHA1PRNG_SecureRandomImpl");put("SecureRandom.SHA1PRNG ImplementedIn", "Software");}}}
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