Android端对String进行AES加密解密方法

网上收集整理的Android端对String进行AES加密/解密方法 两种方法都实测可用

方法一

import android.util.Base64; import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; public class AESCipher { // private static final String CipherMode = "AES/ECB/PKCS5Padding";使用ECB加密，不需要设置IV，但是不安全 private static final String CipherMode = "AES/CFB/NoPadding";//使用CFB加密，需要设置IV /** * 对字符串加密 * * @param key 密钥 * @param data 源字符串 * @return 加密后的字符串 */ public static String encrypt(String key, String data) throws Exception { try { Cipher cipher = Cipher.getInstance(CipherMode); SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES"); cipher.init(Cipher.ENCRYPT_MODE, keyspec, new IvParameterSpec( new byte[cipher.getBlockSize()])); byte[] encrypted = cipher.doFinal(data.getBytes()); return Base64.encodeToString(encrypted, Base64.DEFAULT); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 对字符串解密 * * @param key 密钥 * @param data 已被加密的字符串 * @return 解密得到的字符串 */ public static String decrypt(String key, String data) throws Exception { try { byte[] encrypted1 = Base64.decode(data.getBytes(), Base64.DEFAULT); Cipher cipher = Cipher.getInstance(CipherMode); SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES"); cipher.init(Cipher.DECRYPT_MODE, keyspec, new IvParameterSpec( new byte[cipher.getBlockSize()])); byte[] original = cipher.doFinal(encrypted1); return new String(original, "UTF-8"); } catch (Exception e) { e.printStackTrace(); return null; } } }

方法二

import android.util.Log; import java.io.UnsupportedEncodingException; import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; public class AESUtil { // private static final String CipherMode = "AES/ECB/PKCS5Padding";使用ECB加密，不需要设置IV，但是不安全 private static final String CipherMode = "AES/CFB/NoPadding";//使用CFB加密，需要设置IV // /** 创建密钥 **/ private static SecretKeySpec createKey(String password) { byte[] data = null; if (password == null) { password = ""; } StringBuilder sb = new StringBuilder(32); sb.append(password); while (sb.length() < 32) { sb.append("0"); } if (sb.length() > 32) { sb.setLength(32); } try { data = sb.toString().getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new SecretKeySpec(data, "AES"); } // /** 加密字节数据 **/ private static byte[] encrypt(byte[] content, String password) { try { SecretKeySpec key = createKey(password); System.out.println(key); Cipher cipher = Cipher.getInstance(CipherMode); cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec( new byte[cipher.getBlockSize()])); return cipher.doFinal(content); } catch (Exception e) { e.printStackTrace(); } return null; } // /** 加密(结果为16进制字符串) **/ public static String encrypt(String password,String content ) { Log.d("加密前","seed="+password+"\ncontent="+content); byte[] data = null; try { data = content.getBytes("UTF-8"); } catch (Exception e) { e.printStackTrace(); } data = encrypt(data, password); String result = byte2hex(data); Log.d("加密后","result="+result); return result; } // /** 解密字节数组 **/ private static byte[] decrypt(byte[] content, String password) { try { SecretKeySpec key = createKey(password); Cipher cipher = Cipher.getInstance(CipherMode); cipher.init(Cipher.DECRYPT_MODE, key,new IvParameterSpec( new byte[cipher.getBlockSize()])); return cipher.doFinal(content); } catch (Exception e) { e.printStackTrace(); } return null; } // /** 解密16进制的字符串为字符串 **/ public static String decrypt(String password,String content) { Log.d("解密前","seed="+password+"\ncontent="+content); byte[] data = null; try { data = hex2byte(content); } catch (Exception e) { e.printStackTrace(); } data = decrypt(data, password); if (data == null) return null; String result = null; try { result = new String(data, "UTF-8"); Log.d("解密后","result="+result); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return result; } // /** 字节数组转成16进制字符串 **/ private static String byte2hex(byte[] b) { // 一个字节的数， StringBuilder sb = new StringBuilder(b.length * 2); String tmp = ""; for (byte aB : b) { // 整数转成十六进制表示 tmp = (Integer.toHexString(aB & 0XFF)); if (tmp.length() == 1) { sb.append("0"); } sb.append(tmp); } return sb.toString().toUpperCase(); // 转成大写 } // /** 将hex字符串转换成字节数组 **/ private static byte[] hex2byte(String inputString) { if (inputString == null || inputString.length() < 2) { return new byte[0]; } inputString = inputString.toLowerCase(); int l = inputString.length() / 2; byte[] result = new byte[l]; for (int i = 0; i < l; ++i) { String tmp = inputString.substring(2 * i, 2 * i + 2); result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF); } return result; } }

以上代码皆为在其他博客收集整理，但出处已经忘了，如果有不当之处请联系我！