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【Java】实现android的AES加密技术
作者:DDT / 发布于2012/10/22/ 1264
实现android的AES加密技
import java.security.SecureRandom; </div>
<div></div>
import javax.crypto.Cipher; </div>
import javax.crypto.KeyGenerator; </div>
import javax.crypto.SecretKey; </div>
import javax.crypto.spec.SecretKeySpec; </div>
<div></div>
<div></div>
<div>public class SimpleCrypto { </div>
<div></div>
<div>  public static String encrypt(String seed, String cleartext) throws Exception { </div>
<div>    byte[] rawKey = getRawKey(seed.getBytes()); </div>
<div>    byte[] result = encrypt(rawKey, cleartext.getBytes()); </div>
<div>    return toHex(result); </div>
<div>  } </div>
<div>   </div>
<div>  public static String decrypt(String seed, String encrypted) throws Exception { </div>
<div>    byte[] rawKey = getRawKey(seed.getBytes()); </div>
<div>    byte[] enc = toByte(encrypted); </div>
<div>    byte[] result = decrypt(rawKey, enc); </div>
<div>    return new String(result); </div>
<div>  } </div>
<div></div>
<div>  private static byte[] getRawKey(byte[] seed) throws Exception { </div>
<div>    KeyGenerator kgen = KeyGenerator.getInstance("AES"); </div>
<div>    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); </div>
<div>    sr.setSeed(seed); </div>
<div>    kgen.init(128, sr); // 192 and 256 bits may not be available </div>
<div>    SecretKey skey = kgen.generateKey(); </div>
<div>    byte[] raw = skey.getEncoded(); </div>
<div>    return raw; </div>
<div>  } </div>
<div></div>
<div>   </div>
<div>  private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception { </div>
<div>    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); </div>
<div>    Cipher cipher = Cipher.getInstance("AES"); </div>
<div>    cipher.init(Cipher.ENCRYPT_MODE, skeySpec); </div>
<div>    byte[] encrypted = cipher.doFinal(clear); </div>
<div>    return encrypted; </div>
<div>  } </div>
<div></div>
<div>  private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception { </div>
<div>    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); </div>
<div>    Cipher cipher = Cipher.getInstance("AES"); </div>
<div>    cipher.init(Cipher.DECRYPT_MODE, skeySpec); </div>
<div>    byte[] decrypted = cipher.doFinal(encrypted); </div>
<div>    return decrypted; </div>
<div>  } </div>
<div></div>
<div>  public static String toHex(String txt) { </div>
<div>    return toHex(txt.getBytes()); </div>
<div>  } </div>
<div>  public static String fromHex(String hex) { </div>
<div>    return new String(toByte(hex)); </div>
<div>  } </div>
<div>   </div>
<div>  public static byte[] toByte(String hexString) { </div>
<div>    int len = hexString.length()/2; </div>
<div>    byte[] result = new byte[len]; </div>
<div>    for (int i = 0; i < len; i++) </div>
<div>      result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).bytue(); </div>
<div>    return result; </div>
<div>  } </div>
<div></div>
<div>  public static String toHex(byte[] buf) { </div>
<div>    if (buf == null) </div>
<div>      return ""; </div>
<div>    StringBuffer result = new StringBuffer(2*buf.length); </div>
<div>    for (int i = 0; i < buf.length; i++) { </div>
<div>      appendHex(result, buf[i]); </div>
<div>    } </div>
<div>    return result.toString(); </div>
<div>  } </div>
<div>  private final static String HEX = "0123456789ABCDEF"; </div>
<div>  private static void appendHex(StringBuffer sb, byte b) { </div>
<div>    sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f)); </div>
<div>  } </div>
<div>   </div>
<div>}
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