[英]AES Encryption in android and decryption in php and vice versa
我正在尝试通过针对https://aesencryption.net测试我的代码来学习 AES。 我以前在Base64.encodeBase64String
和Base64.decodeBase64 // encode/decode Base64
中遇到错误。 所以我以某种方式操纵了 Base64 来解决错误。 我认为,现在在我的应用程序中,文本已正确加密和解密。 但是当我尝试加密或解密相同的文本服务器端(在 aesencryption.net)时,该站点无法解密我的加密字符串。 请帮忙。
以下是我的代码:
public class MainActivity extends AppCompatActivity {
static final String TAG = "SymmetricAlgorithmAES";
private static SecretKeySpec secretKey ;
private static byte[] key ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Original text
// {"type":"Success","httpCode":"200","code":"200","message":{"pin":"11111"},"extra":""}
String theTestText = "hi";
TextView tvorig = (TextView)findViewById(R.id.tvorig);
tvorig.setText("\n[ORIGINAL]:\n" + theTestText + "\n");
final String strPssword = "android";
setKey(strPssword);
// Encode the original data with AES
byte[] encodedBytes = null;
try {
Cipher c = Cipher.getInstance("AES");
c.init(Cipher.ENCRYPT_MODE,secretKey);
encodedBytes = c.doFinal(theTestText.getBytes());
} catch (Exception e) {
Log.e(TAG, "AES encryption error");
}
TextView tvencoded = (TextView)findViewById(R.id.tvencoded);
tvencoded.setText("[ENCODED]:\n" +
Base64.encodeToString(encodedBytes, Base64.DEFAULT) + "\n");
Log.d(TAG, Base64.encodeToString(encodedBytes, Base64.DEFAULT));
// Decode the encoded data with AES
byte[] decodedBytes = null;
try {
Cipher c = Cipher.getInstance("AES");
c.init(Cipher.DECRYPT_MODE, secretKey);
decodedBytes = c.doFinal(encodedBytes);
} catch (Exception e) {
Log.e(TAG, "AES decryption error");
}
TextView tvdecoded = (TextView)findViewById(R.id.tvdecoded);
tvdecoded.setText("[DECODED]:\n" + new String(decodedBytes) + "\n");
}
public static void setKey(String myKey){
MessageDigest sha = null;
try {
key = myKey.getBytes("UTF-8");
System.out.println(key.length);
sha = MessageDigest.getInstance("SHA-1");
key = sha.digest(key);
key = Arrays.copyOf(key, 16); // use only first 128 bit
System.out.println(key.length);
System.out.println(new String(key,"UTF-8"));
secretKey = new SecretKeySpec(key, "AES");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}
提前致谢。
我做了这样的事情,它确实有效;)
public class AESCrypter {
private final Cipher cipher;
private final SecretKeySpec key;
private AlgorithmParameterSpec spec;
public AESCrypter(String password) throws Exception
{
// hash password with SHA-256 and crop the output to 128-bit for key
MessageDigest digest = MessageDigest.getInstance("SHA-256");
digest.update(password.getBytes("UTF-8"));
byte[] keyBytes = new byte[32];
System.arraycopy(digest.digest(), 0, keyBytes, 0, keyBytes.length);
cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
key = new SecretKeySpec(keyBytes, "AES");
spec = getIV();
}
public AlgorithmParameterSpec getIV()
{
byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
IvParameterSpec ivParameterSpec;
ivParameterSpec = new IvParameterSpec(iv);
return ivParameterSpec;
}
public String encrypt(String plainText) throws Exception
{
cipher.init(Cipher.ENCRYPT_MODE, key, spec);
byte[] encrypted = cipher.doFinal(plainText.getBytes("UTF-8"));
String encryptedText = new String(Base64.encode(encrypted, Base64.DEFAULT), "UTF-8");
return encryptedText;
}
public String decrypt(String cryptedText) throws Exception
{
cipher.init(Cipher.DECRYPT_MODE, key, spec);
byte[] bytes = Base64.decode(cryptedText, Base64.DEFAULT);
byte[] decrypted = cipher.doFinal(bytes);
String decryptedText = new String(decrypted, "UTF-8");
return decryptedText;
}
}
像这样调用这个 class:
try {
AESCrypter _crypt = new AESCrypter("password");
String output = "";
String plainText = "top secret message";
output = _crypt.encrypt(plainText); //encrypt
System.out.println("encrypted text=" + output);
output = _crypt.decrypt(output); //decrypt
System.out.println("decrypted text=" + output);
} catch (Exception e) {
e.printStackTrace();
}
对于 iPhone(代码在这里): https://github.com/Gurpartap/AESCrypt-ObjC
希望这段代码也适合你:)
PHP 代码默认使用 CBC 模式,而您的 Java 代码没有指定相同的,并将其留给底层实现。 如果我没记错的话,它可能是ECB/PKCS5Padding
。 您的 PHP 实现使用没有填充的“CBC”(默认情况下,mcrypt 不支持填充,但您可以手动执行)。
在使用不同的平台时,非常具体的模式、填充和字符集非常重要,否则您将遇到不同的默认值。
尝试按如下方式初始化您的密码: Cipher.getInstance("AES/CBC/NoPadding");
fun encrypt(encrypted: String): String? {
try {
val secretKey = "secretKey" //The secret key, 32 bytes string.
val ivKey = "ivKey" // The initialization vector, 16 bytes string.
val iv = IvParameterSpec(hashIV.toByteArray(Charsets.UTF_8))
val skySpec = SecretKeySpec(hashKey.toByteArray(Charsets.UTF_8), "AES-256-CBC")
val cipher: Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING")
cipher.init(Cipher.ENCRYPT_MODE, skySpec, iv)
val original: ByteArray = cipher.doFinal(encrypted.toByteArray())
return Base64.encode(
Base64.encodeToString(original, Base64.NO_WRAP).toByteArray(charset("UTF-8")),
Base64.NO_WRAP
).decodeToString()
} catch (ex: Exception) {
ex.printStackTrace()
}
return null
}
fun decrypt(encrypted: String?): String? {
try {
val secretKey = "secretKey" //The secret key, 32 bytes string.
val ivKey = "ivKey" // The initialization vector, 16 bytes string.
val iv = IvParameterSpec(hashIV.toByteArray(Charsets.UTF_8))
val skySpec = SecretKeySpec(hashKey.toByteArray(Charsets.UTF_8), algorithm)
val cipher: Cipher = Cipher.getInstance(transformation)
cipher.init(Cipher.DECRYPT_MODE, skySpec, iv)
val original: ByteArray = cipher.doFinal(
Base64.decode(
Base64.decode(encrypted, Base64.NO_WRAP),
Base64.NO_WRAP
)
)
return original.decodeToString()
} catch (ex: Exception) {
ex.printStackTrace()
}
return null
}
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