AES 加密 绝对好用
自己测过兼容6.0到9.0的AES 工具类采用AES/CBC/PKCS5Padding 绝对好用的哦
调用方式
String enText = AesUtils2.encrypt(AesUtils2.KEY, para);
// String enText = AESUtil2.encrypt(para,AES_KEY);
Toast.makeText(context, " 参数:" + para + "加密后:" + enText, Toast.LENGTH_SHORT).show();
Log.i(TAG, "参数:" + para + "加密后:" + enText);
// String deText = AesUtils.decrypt(AES_KEY, enText);
String deText = AesUtils2.decrypt(AesUtils2.KEY, enText);
Log.i(TAG, "解密后:" + deText);工具类
public class AesUtils2 {
private final static String HEX = "0123456789ABCDEF";
/***
* AES 公钥 必须16位
*/
public final static String KEY = "0123456789654321";
private static final String CBC_PKCS5_PADDING = "AES/CBC/PKCS5Padding";//AES是加密方式 CBC是工作模式 PKCS5Padding是填充模式
// private static final String ECB_PKCS5_PADDING = "AES/ECB/PKCS5Padding";//AES是加密方式 CBC是工作模式 PKCS5Padding是填充模式
private static final String AES = "AES";//AES 加密
private static final String SHA1PRNG = "SHA1PRNG";// SHA1PRNG 强随机种子算法, 要区别4.2以上版本的调用方法
private static String ivParameter = "qwertyuiopasdfgh";//16位的偏移量
/**
* 生成随机数，可以当做动态的密钥 加密和解密的密钥必须一致，不然将不能解密
*/
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;
}
// 对密钥进行处理
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance(AES);
//for android
SecureRandom 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;
if (sdk_version > 23) { // Android 6.0 以上
sr = SecureRandom.getInstance(SHA1PRNG, new CryptoProvider());
} else if (android.os.Build.VERSION.SDK_INT >= 17) { //4.2及以上
sr = SecureRandom.getInstance(SHA1PRNG, "Crypto");
} else {
sr = SecureRandom.getInstance(SHA1PRNG);
}
// for Java
// secureRandom = SecureRandom.getInstance(SHA1PRNG);
sr.setSeed(seed);
kgen.init(128, sr); //256 bits or 128 bits,192bits
//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
*/
public static String encrypt(String key, String cleartext) {
if (TextUtils.isEmpty(cleartext)) {
return cleartext;
}
try {
byte[] result = encrypt(key, cleartext.getBytes());
// return Base64Encoder.encode(result);
return new String(Base64.encode(result, Base64.DEFAULT));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 加密 CBC
*/
private static byte[] encrypt(String key, byte[] data) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), "AES");
// SecretKeyFactory keyfactory = SecretKeyFactory.getInstance(AES);
// Key aeskey = keyfactory.generateSecret(skeySpec);
Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);
IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv
// cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
byte[] encrypted = cipher.doFinal(data);
return encrypted;
}
// /**
// * 加密 EBC
// */
// 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(ECB_PKCS5_PADDING);
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
// cipher.init(Cipher.ENCRYPT_MODE,skeySpec);
// byte[] encrypted = cipher.doFinal(clear);
// return encrypted;
// }
/**
* 解密
*/
public static String decrypt(String key, String encrypted) {
if (TextUtils.isEmpty(encrypted)) {
return encrypted;
}
try {
// byte[] enc = Base64Decoder.decodeToBytes(encrypted);
byte[] enc = Base64.decode(encrypted, Base64.DEFAULT);
byte[] result = decrypt(key, enc);
return new String(result);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 解密 CBC
*/
private static byte[] decrypt(String key, byte[] encrypted) throws Exception {
// byte[] raw = getRawKey(key.getBytes());
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), AES);
Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);
IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
// cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
// /**
// * 解密 EBC
// */
// 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(ECB_PKCS5_PADDING);
// cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
// byte[] decrypted = cipher.doFinal(encrypted);
// return decrypted;
// }
//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");
}
}
}