AES加密解密Android版
16lz
2021-01-23
网上有很多java版的AES加密解密例子代码,但都因为路径问题,在Android上无法使用.
以下代码在Android上测试通过
package cn.com.smartpay.app.http;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;/** * @author carlos carlosk@163.com * @version 创建时间:2012-5-17 上午9:48:35 类说明 */public class AESUtils { public static final String TAG = "AESUtils"; public static String encrypt(String seed, String clearText) { // Log.d(TAG, "加密前的seed=" + seed + ",内容为:" + clearText); byte[] result = null; try { byte[] rawkey = getRawKey(seed.getBytes()); result = encrypt(rawkey, clearText.getBytes()); } catch (Exception e) { e.printStackTrace(); } String content = toHex(result); // Log.d(TAG, "加密后的内容为:" + content); return content; } public static String decrypt(String seed, String encrypted) { // Log.d(TAG, "解密前的seed=" + seed + ",内容为:" + encrypted); byte[] rawKey; try { rawKey = getRawKey(seed.getBytes()); byte[] enc = toByte(encrypted); byte[] result = decrypt(rawKey, enc); String coentn = new String(result); // Log.d(TAG, "解密后的内容为:" + coentn); return coentn; } catch (Exception e) { e.printStackTrace(); return null; } } private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(seed); kgen.init(128, sr); SecretKey sKey = kgen.generateKey(); byte[] raw = sKey.getEncoded(); return raw; } private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");// Cipher cipher = Cipher.getInstance("AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec( new byte[cipher.getBlockSize()])); byte[] encrypted = cipher.doFinal(clear); return encrypted; } private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");// Cipher cipher = Cipher.getInstance("AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec( new byte[cipher.getBlockSize()])); byte[] decrypted = cipher.doFinal(encrypted); return decrypted; } public static String toHex(String txt) { return toHex(txt.getBytes()); } public static String fromHex(String hex) { return new String(toByte(hex)); } public static byte[] toByte(String hexString) { int len = hexString.length() / 2; byte[] result = new byte[len]; for (int i = 0; i < len; i++) result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue(); return result; } 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) { final String HEX = "0123456789ABCDEF"; sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f)); }}
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