http://android-developers.blogspot.in/2013/02/using-cryptography-to-store-credentials.html
http://developer.android.com/reference/javax/crypto/SecretKeyFactory.html
检查上面的链接。使用以下内容作为参考。根据您的需要修改以下内容。
用法
try {
DescEncrypter ec = new DescEncrypter();
byte[] cipherText =ec.encrypt("hi", "hello");
String enc = new String(cipherText,"UTF-8");
String decryp= ec.decrypt("hi", cipherText);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
DescEncrypter.java
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
public class DescEncrypter {
public static final int SALT_LENGTH = 20;
public static final int PBE_ITERATION_COUNT = 200; //1024;
private static final String PBE_ALGORITHM = "PBEWithSHA256And256BitAES-CBC-BC";
//algoritmo / modo / relleno
private static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
byte[] iv = "1234567890asdfgh".getBytes();
byte[] salt = "dfghjklpoiuytgftgyhj".getBytes();
public byte[] encrypt(String password, String cleartext) {
byte[] encryptedText = null;
try {
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray(), salt, PBE_ITERATION_COUNT, 256);
//Factoria para crear la SecretKey, debemos indicar el Algoritmo
SecretKeyFactory factory = SecretKeyFactory.getInstance(PBE_ALGORITHM);
SecretKey tmp = factory.generateSecret(pbeKeySpec);
//Creamos una llave;
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
//Obtenemos la llave, solo informativo
byte[] key = secret.getEncoded();
//La clase Cipher, se usa para cifrar mediante algoritmos de clave simétrica
Cipher encryptionCipher = Cipher.getInstance(CIPHER_ALGORITHM);
//byte[] iv = generateIv();
IvParameterSpec ivspec = new IvParameterSpec(iv);
//Accion, SecretKey, parameter specification for an initialization vector
encryptionCipher.init(Cipher.ENCRYPT_MODE, secret, ivspec);
//Realizamos el cifrado
encryptedText = encryptionCipher.doFinal(cleartext.getBytes());
} catch (Exception e) {
e.printStackTrace();
}
return encryptedText;
}
public String decrypt(String password, byte[] encryptedText) {
String cleartext = "";
try {
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray(), salt, PBE_ITERATION_COUNT, 256);
//Factoria para crear la SecretKey, debemos indicar el Algoritmo
SecretKeyFactory factory = SecretKeyFactory.getInstance(PBE_ALGORITHM);
SecretKey tmp = factory.generateSecret(pbeKeySpec);
//Creamos una llave;
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
//Obtenemos la llave, solo informativo
byte[] key = secret.getEncoded();
//La clase Cipher, se usa para cifrar mediante algoritmos de clave simétrica
Cipher decryptionCipher = Cipher.getInstance(CIPHER_ALGORITHM);
//byte[] iv = generateIv();
IvParameterSpec ivspec = new IvParameterSpec(iv);
//Accion, SecretKey, parameter specification for an initialization vector
decryptionCipher.init(Cipher.DECRYPT_MODE, secret, ivspec);
//Realizamos el descifrado
byte[] decryptedText = decryptionCipher.doFinal(encryptedText);
cleartext = new String(decryptedText);
} catch (Exception e) {
e.printStackTrace();
}
return cleartext;
}
}