? ? ? ?昨天，老板讓我來看看android加密算法。于是在網上找了找，發現AES加密算法。（當然，MD5,BASE64什么http://snowolf.iteye.com/blog/379860這篇文章列舉了非常多。可是基本都是j2se平臺的。android平臺不一定支持，可是AES算法Android是自帶了包的，從官方的http://developer.android.com/reference/javax/crypto/Cipher.html能夠看到。

）

?AES加密算法是什么？大家能夠自己去google，專家級程序猿寫好包，project人員會用即可了。

這個樣例事實上是來自http://www.tutorials-android.com/learn/How_to_encrypt_and_decrypt_strings.rhtml。

src文件夾主文件：

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package com.qq; import java.security.SecureRandom;import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec;import android.app.Activity; import android.os.Bundle; import android.util.Log;public class SimpleCrypto extends Activity {public static String encrypt(String seed, String cleartext) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] result = encrypt(rawKey, cleartext.getBytes()); return toHex(result); } 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[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); 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; } 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 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; } 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 final static String HEX = "0123456789ABCDEF"; private static void appendHex(StringBuffer sb, byte b) { sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f)); } /** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);String masterPassword = "a";String originalText = "0123456789";byte[] text = new byte[]{'0','1','2','3','4','5','6','7','8','9'};byte[] password = new byte[]{'a'};try {String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText); // System.out.println("加密結果為 " + encryptingCode);Log.i("加密結果為 ",encryptingCode);String decryptingCode = SimpleCrypto.decrypt(masterPassword, encryptingCode);System.out.println("解密結果為 " + decryptingCode);Log.i("解密結果",decryptingCode);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}} }
布局文件main.xml和配置文件AndroidManifest.xml默認就好了。

最后結果在Log里面看，利用adb logcat > d:\1.txt定位到D盤的1.txt文件。然后用記事本打開就，查找”加密結果為“就能夠看到了：

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執行結果（從log日志中看到的）：

I/加密結果 ( ?190): BFB77D8F1E1EE9D5E252926A12659DE8

I/解密結果( ?190): 0123456789

轉載于:https://www.cnblogs.com/mengfanrong/p/4562652.html

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