Android AESUtils 工具类与调用方法
16lz
2021-01-23
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.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 AESUtils { private final static String HEX = "0123456789ABCDEF"; 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 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 /** * 返回固定的KEY * @return */ public static String fixedKey(){ String secret_key = "F2492E93586F768B1E9C80C10EBA1CA88AB6B16C"; //"{\"activation_result\":-2,\"member_username\":\"qwe\",\"member_expirationtime\":0}"; return secret_key; } /** * 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 * * @param seed * @return * @throws Exception */ @SuppressLint("DeletedProvider") 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 */ 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 */ 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 */ 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; } //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"); } }}调用方法
String jsonData = "{\"activation_result\":-2,\"member_username\":\"qwe\",\"member_expirationtime\":0}"; Log.e("MainActivity", "AES加密前json数据 ---->" + jsonData); Log.e("MainActivity", "AES加密前json数据长度 ---->" + jsonData.length()); //生成一个动态key String secretKey = AESUtils.generateKey(); Log.e("MainActivity", "AES动态secretKey ---->" + secretKey); //AES加密 long start = System.currentTimeMillis(); String encryStr = AESUtils.encrypt(secretKey, jsonData); long end = System.currentTimeMillis(); Log.e("MainActivity", "AES加密耗时 cost time---->" + (end - start)); Log.e("MainActivity", "AES加密后json数据 ---->" + encryStr); Log.e("MainActivity", "AES加密后json数据长度 ---->" + encryStr.length()); //AES解密 start = System.currentTimeMillis(); String decryStr = AESUtils.decrypt(secretKey, encryStr); end = System.currentTimeMillis(); Log.e("MainActivity", "AES解密耗时 cost time---->" + (end - start)); Log.e("MainActivity", "AES解密后json数据 ---->" + decryStr);
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