android base64解密,android Base64 AES加密解密
Android Base64代碼如下：
// 加密傳入的數據是byte類型的，并非使用decode方法將原始數據轉二進制，String類型的數據 使用 str.getBytes()即可
String str = "Hello!";
// 在這里使用的是encode方式，返回的是byte類型加密數據，可使用new String轉為String類型
String strBase64 = new String(Base64.encode(str.getBytes(), Base64.DEFAULT));
Log.i("Test", "encode >>>" + strBase64);
// 這里 encodeToString 則直接將返回String類型的加密數據
String enToStr = Base64.encodeToString(str.getBytes(), Base64.DEFAULT);
Log.i("Test", "encodeToString >>> " + enToStr);
// 對base64加密后的數據進行解密
Log.i("Test", "decode >>>" + new String(Base64.decode(strBase64.getBytes(), Base64.DEFAULT)));
Android AES代碼如下：
/**
* @param
* @return AES加密算法加密
* @throws Exception
*/
public static String encrypt(String seed, String cleartext)
throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
/**
* @param
* @return AES加密算法加密
* @throws Exception
*/
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static String toHex(byte[] buf) {
final String HEX = "0123456789ABCDEF";
if (buf == null)
return "";
StringBuffer result = new StringBuffer(2 * buf.length);
for (int i = 0; i < buf.length; i++) {
result.append(HEX.charAt((buf[i] >> 4) & 0x0f)).append(
HEX.charAt(buf[i] & 0x0f));
}
return result.toString();
}
/**
* @param raw
* @param encrypted
* @return AES加密算法解密
* @throws Exception
*/
public static String decrypt(String seed, String encrypted)
throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] decrypt(byte[] raw, byte[] encrypted)
throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
private 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;
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
sr.setSeed(seed);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
// 使用該方法
String masterPassword = "test";
String originalText = "0123456789";
String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText);
Log.i("加密結果為 ",encryptingCode);
String decryptingCode = SimpleCrypto.decrypt(masterPassword, encryptingCode);
Log.i("解密結果",decryptingCode);
總結
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