Android AESUtils 工具类与调用方法
【摘要】
加密类
package com.test.abc; import android.annotation.SuppressLint;import android.text.TextUtils;import android.util.Base64;import android.util.Log; import java.security....
加密类
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package com.test.abc;
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import android.annotation.SuppressLint;
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import android.text.TextUtils;
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import android.util.Base64;
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import android.util.Log;
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import java.security.Provider;
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import java.security.SecureRandom;
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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public class AESUtils {
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private final static String HEX = "0123456789ABCDEF";
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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
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private static final String AES = "AES";//AES 加密
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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
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/**
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* 返回固定的KEY
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* @return
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*/
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public static String fixedKey(){
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String secret_key = "F2492E93586F768B1E9C80C10EBA1CA88AB6B16C";
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//"{\"activation_result\":-2,\"member_username\":\"qwe\",\"member_expirationtime\":0}";
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return secret_key;
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}
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/**
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* 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
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*/
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public static String generateKey() {
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try {
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SecureRandom localSecureRandom = SecureRandom.getInstance(SHA1PRNG);
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byte[] bytes_key = new byte[20];
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localSecureRandom.nextBytes(bytes_key);
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String str_key = toHex(bytes_key);
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return str_key;
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 对密钥进行处理
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*
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* @param seed
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* @return
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* @throws Exception
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*/
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@SuppressLint("DeletedProvider")
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private static byte[] getRawKey(byte[] seed) throws Exception {
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KeyGenerator kgen = KeyGenerator.getInstance(AES);
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//for android
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SecureRandom sr = null;
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// 在4.2以上版本中，SecureRandom获取方式发生了改变
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int sdk_version = android.os.Build.VERSION.SDK_INT;
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if (sdk_version > 23) { // Android 6.0 以上
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sr = SecureRandom.getInstance(SHA1PRNG, new CryptoProvider());
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} else if (android.os.Build.VERSION.SDK_INT >= 17) { //4.2及以上
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sr = SecureRandom.getInstance(SHA1PRNG, "Crypto");
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} else {
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sr = SecureRandom.getInstance(SHA1PRNG);
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}
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// for Java
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// secureRandom = SecureRandom.getInstance(SHA1PRNG);
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sr.setSeed(seed);
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kgen.init(128, sr); //256 bits or 128 bits,192bits
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//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。
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SecretKey skey = kgen.generateKey();
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byte[] raw = skey.getEncoded();
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return raw;
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}
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/**
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* 加密
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*/
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public static String encrypt(String key, String cleartext) {
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if (TextUtils.isEmpty(cleartext)) {
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return cleartext;
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}
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try {
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byte[] result = encrypt(key, cleartext.getBytes());
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// return Base64Encoder.encode(result);
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return new String(Base64.encode(result, Base64.DEFAULT));
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 加密
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*/
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private static byte[] encrypt(String key, byte[] clear) throws Exception {
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byte[] raw = getRawKey(key.getBytes());
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SecretKeySpec skeySpec = new SecretKeySpec(raw, AES);
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Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);
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cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
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byte[] encrypted = cipher.doFinal(clear);
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return encrypted;
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}
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/**
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* 解密
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*/
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public static String decrypt(String key, String encrypted) {
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if (TextUtils.isEmpty(encrypted)) {
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return encrypted;
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}
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try {
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// byte[] enc = Base64Decoder.decodeToBytes(encrypted);
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byte[] enc = Base64.decode(encrypted, Base64.DEFAULT);
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byte[] result = decrypt(key, enc);
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return new String(result);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 解密
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*/
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private static byte[] decrypt(String key, byte[] encrypted) throws Exception {
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byte[] raw = getRawKey(key.getBytes());
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SecretKeySpec skeySpec = new SecretKeySpec(raw, AES);
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Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);
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cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
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byte[] decrypted = cipher.doFinal(encrypted);
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return decrypted;
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}
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//二进制转字符
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public static String toHex(byte[] buf) {
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if (buf == null)
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return "";
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StringBuffer result = new StringBuffer(2 * buf.length);
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for (int i = 0; i < buf.length; i++) {
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appendHex(result, buf[i]);
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}
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return result.toString();
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}
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private static void appendHex(StringBuffer sb, byte b) {
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sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
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}
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// 增加 CryptoProvider 类
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public static class CryptoProvider extends Provider {
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/**
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* Creates a Provider and puts parameters
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*/
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public CryptoProvider() {
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super("Crypto", 1.0, "HARMONY (SHA1 digest; SecureRandom; SHA1withDSA signature)");
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put("SecureRandom.SHA1PRNG",
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"org.apache.harmony.security.provider.crypto.SHA1PRNG_SecureRandomImpl");
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put("SecureRandom.SHA1PRNG ImplementedIn", "Software");
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}
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}
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}
调用方法
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String jsonData = "{\"activation_result\":-2,\"member_username\":\"qwe\",\"member_expirationtime\":0}";
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Log.e("MainActivity", "AES加密前json数据 ---->" + jsonData);
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Log.e("MainActivity", "AES加密前json数据长度 ---->" + jsonData.length());
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//生成一个动态key
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String secretKey = AESUtils.generateKey();
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Log.e("MainActivity", "AES动态secretKey ---->" + secretKey);
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//AES加密
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long start = System.currentTimeMillis();
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String encryStr = AESUtils.encrypt(secretKey, jsonData);
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long end = System.currentTimeMillis();
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Log.e("MainActivity", "AES加密耗时 cost time---->" + (end - start));
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Log.e("MainActivity", "AES加密后json数据 ---->" + encryStr);
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Log.e("MainActivity", "AES加密后json数据长度 ---->" + encryStr.length());
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//AES解密
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start = System.currentTimeMillis();
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String decryStr = AESUtils.decrypt(secretKey, encryStr);
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end = System.currentTimeMillis();
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Log.e("MainActivity", "AES解密耗时 cost time---->" + (end - start));
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Log.e("MainActivity", "AES解密后json数据 ---->" + decryStr);
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文章来源: blog.csdn.net，作者：fengda2870，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/fengda2870/article/details/104771485
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