我想在productid中传递一些值并给出一个加密的字符串在dat字节加密值后设置在textfield上...我正在使用dis代码但是获得了nvalue of encrpted是在数组格式中如何获得dat加密的dat值字符串格式和数据后我想要dat加密代码转换为原始方式解密... PLZ帮助我
final EditText productid = (EditText) findViewById(R.id.editText1);
Button encryptButton = (Button) findViewById(R.id.encrypt);
final TextView value = (TextView) findViewById(R.id.value);
encryptButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String valid_productid = productid.getText().toString();
ivspec = new IvParameterSpec(iv.getBytes());
keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");
try {
cipher = Cipher.getInstance("AES/CBC/NoPadding");
//encrypt(valid_productid);
byte[] cipher = encrypt(valid_productid);
System.out.print("cipher: ");
for (int i=0; i<cipher.length; i++)
System.out.print(new Integer(cipher[i])+" ");
System.out.println("");
System.out.println(cipher);
/*String decrypted = decrypt(cipher);
System.out.println("decrypt: " + decrypted);
value.setText(cipher);*/
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
public byte[] encrypt(String text) throws Exception
{
if(text == null || text.length() == 0)
throw new Exception("Empty string");
byte[] encrypted = null;
try {
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
encrypted = cipher.doFinal(padString(text).getBytes());
} catch (Exception e)
{
throw new Exception("[encrypt] " + e.getMessage());
}
return encrypted;
}
public byte[] decrypt(String code) throws Exception
{
if(code == null || code.length() == 0)
throw new Exception("Empty string");
byte[] decrypted = null;
try {
cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
decrypted = cipher.doFinal(hexToBytes(code));
} catch (Exception e)
{
throw new Exception("[decrypt] " + e.getMessage());
}
return decrypted;
}
public static String bytesToHex(byte[] data)
{
if (data==null)
{
return null;
}
int len = data.length;
String str = "";
for (int i=0; i<len; i++) {
if ((data[i]&0xFF)<16)
str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);
else
str = str + java.lang.Integer.toHexString(data[i]&0xFF);
}
return str;
}
public static byte[] hexToBytes(String str) {
if (str==null) {
return null;
} else if (str.length() < 2) {
return null;
} else {
int len = str.length() / 2;
byte[] buffer = new byte[len];
for (int i=0; i<len; i++) {
buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
}
return buffer;
}
}
private static String padString(String source)
{
char paddingChar = ' ';
int size = 16;
int x = source.length() % size;
int padLength = size - x;
for (int i = 0; i < padLength; i++)
{
source += paddingChar;
}
return source;
}
答案 0 :(得分：-1)
在这里，我为您添加了示例代码。请尝试让我知道。
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import android.util.Base64;
public class EncodeDecodeAES {
private final static String HEX = "0123456789ABCDEF";
private final static String key = "encryptionKey"
private final static int JELLY_BEAN_4_2 = 17;
private final static byte[] key = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
public static String encrypt(String cleartext) throws Exception {
return encrypt(key,cleartext);
}
public static String decrypt(String cleartext) throws Exception {
return decrypt(key,cleartext);
}
public static String encrypt(String seed, String cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
String fromHex = toHex(result);
String base64 = new String(Base64.encodeToString(fromHex.getBytes(), 0));
return base64;
}
public static String decrypt(String seed, String encrypted) throws Exception {
byte[] seedByte = seed.getBytes();
System.arraycopy(seedByte, 0, key, 0, ((seedByte.length < 16) ? seedByte.length : 16));
String base64 = new String(Base64.decode(encrypted, 0));
byte[] rawKey = getRawKey(seedByte);
byte[] enc = toByte(base64);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
public static byte[] encryptBytes(String seed, byte[] cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext);
return result;
}
public static byte[] decryptBytes(String seed, byte[] encrypted) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = decrypt(rawKey, encrypted);
return result;
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES"); // , "SC");
SecureRandom sr = null;
if (android.os.Build.VERSION.SDK_INT >= JELLY_BEAN_4_2) {
sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
} else {
sr = SecureRandom.getInstance("SHA1PRNG");
}
sr.setSeed(seed);
try {
kgen.init(256, sr);
// kgen.init(128, sr);
} catch (Exception e) {
// Log.w(LOG, "This device doesn't suppor 256bits, trying 192bits.");
try {
kgen.init(192, sr);
} catch (Exception e1) {
// Log.w(LOG, "This device doesn't suppor 192bits, trying 128bits.");
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"); // /ECB/PKCS7Padding", "SC");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
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"); // /ECB/PKCS7Padding", "SC");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
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) {
sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
}
}
如何调用您的活动：
<强>加密
String Name = EncodeDecodeAES.encrypt("John Smith");
Log.d("Encrypted value",Name);
<强>解密：
String Name = EncodeDecodeAES.decrypt("NzhEMTlBMUExRTU5OEVDMDBEMDI5NkVDMTlBQzZGNkI=");
Log.d("Decrypted value",Name);
希望它对你有所帮助。