AES加密解密代码

古城微笑少年丶 2022-06-09 13:50 218阅读 0赞

在做公司项目时，提到要有安全整改，例如需要将保存到sharedPreference中的密码等敏感信息，进行加密保存。  
  
在网上查找了关于AES的一些加密解密方法，但有些方法可以进行加密，但解密的不是原来的值，下面的方法是经过自己验证后可以使用的：  
  
public static final String AES\_KEY\_NUMBER = "hpgaerjnaoouekvs";  
private final static String HEX = "0123456789ABCDEF";  
public static String encryptAES(String cleartext,String seed) \{  
  
try \{  
KeyGenerator kgen = KeyGenerator.getInstance("AES");  
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");  
sr.setSeed(seed.getBytes());  
kgen.init(128, sr); // 192 and 256 bits may not be available  
SecretKey skey = kgen.generateKey();  
byte\[\] raw = skey.getEncoded();  
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  
Cipher cipher = Cipher.getInstance("AES");  
cipher.init(Cipher.ENCRYPT\_MODE, skeySpec, new IvParameterSpec(new byte\[cipher.getBlockSize()\]));  
byte\[\] encrypted = cipher.doFinal(cleartext.getBytes());  
if (encrypted == null)  
return "";  
StringBuffer result = new StringBuffer(2 \* encrypted.length);  
for (int i = 0; i < encrypted.length; i++) \{  
result.append(HEX.charAt((encrypted\[i\] >> 4) & 0x0f)).append(HEX.charAt(encrypted\[i\] & 0x0f));  
\}  
return result.toString();  
\} catch (Exception e) \{  
e.printStackTrace();  
return "";  
\}  
\}  
  
public static String decryptAES(String encrypted,String seed) \{  
try \{  
KeyGenerator kgen = KeyGenerator.getInstance("AES");  
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");  
sr.setSeed(seed.getBytes());  
kgen.init(128, sr); // 192 and 256 bits may not be available  
SecretKey skey = kgen.generateKey();  
byte\[\] raw = skey.getEncoded();  
  
int len = encrypted.length() / 2;  
byte\[\] result = new byte\[len\];  
for (int i = 0; i < len; i++)  
result\[i\] = Integer.valueOf(encrypted.substring(2 \* i, 2 \* i + 2), 16).byteValue();  
  
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  
Cipher cipher = Cipher.getInstance("AES");  
cipher.init(Cipher.DECRYPT\_MODE, skeySpec, new IvParameterSpec(new byte\[cipher.getBlockSize()\]));  
byte\[\] decrypted = cipher.doFinal(result);  
  
return new String(decrypted);  
\} catch (Exception e) \{  
e.printStackTrace();  
return "";  
\}  
\}  
  
  
此方法可用，如果要使用Base64的，不过对于使用SVN的开发的话，导包是会遇到困难的，代码如下：  
  
/\*\*  
\* AES 加密  
\*  
\* @param content  
\* @param key  
\* @return  
\*/  
public static String encryptAES(String content, String key) \{  
try \{  
byte\[\] byteContent = content.getBytes("UTF-8");  
// 注意，为了能与 iOS 统一  
// 这里的 key 不可以使用 KeyGenerator、SecureRandom、SecretKey 生成  
byte\[\] enCodeFormat = key.getBytes();  
SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");  
byte\[\] initParam = AES\_KEY\_NUMBER.getBytes();  
IvParameterSpec ivParameterSpec = new IvParameterSpec(initParam);  
// 指定加密的算法、工作模式和填充方式  
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");  
cipher.init(Cipher.ENCRYPT\_MODE, secretKeySpec, ivParameterSpec);  
byte\[\] encryptedBytes = cipher.doFinal(byteContent);  
// 同样对加密后数据进行 base64 编码  
BASE64Encoder encoder = new BASE64Encoder();  
return encoder.encode(encryptedBytes);  
\} catch (Exception e) \{  
// TODO Auto-generated catch block  
e.printStackTrace();  
return "";  
\}  
\}  
  
/\*\*  
\* AES 解密  
\*  
\* @param content  
\* @param key  
\* @return  
\*/  
public static String decryptAES(String content, String key) \{  
try \{  
// base64 解码  
BASE64Decoder decoder = new BASE64Decoder();  
byte\[\] encryptedBytes = decoder.decodeBuffer(content);  
byte\[\] enCodeFormat = key.getBytes();  
SecretKeySpec secretKey = new SecretKeySpec(enCodeFormat, "AES");  
byte\[\] initParam = AES\_KEY\_NUMBER.getBytes();  
IvParameterSpec ivParameterSpec = new IvParameterSpec(initParam);  
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");  
cipher.init(Cipher.DECRYPT\_MODE, secretKey, ivParameterSpec);  
byte\[\] result = cipher.doFinal(encryptedBytes);  
return new String(result, "UTF-8");  
\} catch (Exception e) \{  
// TODO Auto-generated catch block  
e.printStackTrace();  
return "";  
\}  
\}