因为项目的需求,最近几天一直在看关于加密的问题,将项目中使用到的DES加密整理一下,它可以使用适用于NET,Android,iOS三个平台.
DES加密,DES有两种,一种是DES,对每组分组进行一次加密,另一种是DES的升级版3DES,就是对每组分组进行3此加密,前者最大可使用8位的密匙,后者最大可使用24为密匙。
看代码:
.NET
<pre>
<code class = 'cs hljs'>
//////
/// 密匙
//////
public static string sKey = "12345678";
///
/// 解密
///
/// 要解密的以Base64
/// 密钥,且必须为8位
/// 已解密的字符串
public static string DesDecrypt(string pToDecrypt)
{
//转义特殊字符
pToDecrypt = pToDecrypt.Replace("-", "+");
pToDecrypt = pToDecrypt.Replace("_", "/");
pToDecrypt = pToDecrypt.Replace("~", "=");
byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return str;
}
}
/// 对字符串进行DES加密
///
/// 待加密的字符串
/// 加密后的BASE64编码的字符串
public string Encrypt(string sourceString)
{
byte[] btKey = Encoding.UTF8.GetBytes(sKey);
byte[] btIV = Encoding.UTF8.GetBytes(sKey);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
using (MemoryStream ms = new MemoryStream())
{
byte[] inData = Encoding.UTF8.GetBytes(sourceString);
try
{
using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))
{
cs.Write(inData, 0, inData.Length);
cs.FlushFinalBlock();
}
return Convert.ToBase64String(ms.ToArray());
}
catch
{
throw;
}
}
}
</code></pre>
Android
<pre><code class= 'hljs'>
// 加密
public static String DecryptDoNet(String message, String key)
throws Exception {
byte[] bytesrc = Base64.decode(message.getBytes(), Base64.DEFAULT);
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte);
}
// 解密
public static String EncryptAsDoNet(String message, String key) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
byte[] encryptbyte = cipher.doFinal(message.getBytes());
return new String(Base64.encode(encryptbyte, Base64.DEFAULT));
}
</code></pre>
iOS
<pre>
<code class='Xcode'>
/**
- DES加密解密(封装参数为NSString)
- @param content 加解密内容
- @param type 加/解密
- @param aKey 密匙
- @return 加/解密后的内容
/
+(NSString)encryptWithContent:(NSString)content type:(CCOperation)type key:(NSString)aKey
{
const char * contentChar =[content UTF8String];
char * keyChar =(char*)[aKey UTF8String];
const char *miChar;
miChar = encryptWithKeyAndType(contentChar, type, keyChar);
return [NSString stringWithCString:miChar encoding:NSUTF8StringEncoding];
}
/**
DES加密解密
@param text 需要加/解密的内容
@param encryptOperation 加/解密
@param key 密匙
-
@return 加/解密后的内容
/
static const char encryptWithKeyAndType(const char *text,CCOperation encryptOperation,char *key)
{
NSString *textString=[[NSString alloc]initWithCString:text encoding:NSUTF8StringEncoding];
const void *dataIn;//
size_t dataInLength;
if (encryptOperation == kCCDecrypt)//传递过来的是decrypt 解码
{
//解码 base64 // !!!!!!!!!!!!!!!!!-------->【解密进行了Base64字符串处理】,加密时使用,如要使用,去除Base64即可
NSData decryptData = [GTMBase64 decodeData:[textString dataUsingEncoding:NSUTF8StringEncoding]];//转成utf-8并decode
dataInLength = [decryptData length];
dataIn = [decryptData bytes];
}
else //encrypt
{
NSData encryptData = [textString dataUsingEncoding:NSUTF8StringEncoding];
dataInLength = [encryptData length];
dataIn = (const void *)[encryptData bytes];
}CCCryptorStatus ccStatus;
uint8_t *dataOut = NULL; //可以理解位type/typedef 的缩写(有效的维护了代码,比如:一个人用int,一个人用long。最好用typedef来定义)
size_t dataOutAvailable = 0; //size_t 是操作符sizeof返回的结果类型
size_t dataOutMoved = 0;dataOutAvailable = (dataInLength + kCCBlockSizeDES) & ~(kCCBlockSizeDES - 1);
dataOut = malloc( dataOutAvailable * sizeof(uint8_t));
memset((void *)dataOut, 00, dataOutAvailable);//将已开辟内存空间buffer的首 1 个字节的值设为值 0
const void *vkey = key;
const void *iv = (const void *) key; //[initIv UTF8String];//CCCrypt函数 加密/解密
ccStatus = CCCrypt(encryptOperation,// 加密/解密
kCCAlgorithmDES,// 加密根据哪个标准(des,3des,aes。。。。)
kCCOptionPKCS7Padding,// 选项分组密码算法(des:对每块分组加一次密 3DES:对每块分组加三个不同的密)
vkey, //密钥 加密和解密的密钥必须一致
kCCKeySizeDES,// DES 密钥的大小(kCCKeySizeDES=8)
iv, // 可选的初始矢量
dataIn, // 数据的存储单元
dataInLength,// 数据的大小
(void *)dataOut,// 用于返回数据
dataOutAvailable,
&dataOutMoved);NSString *result = nil;
if (encryptOperation == kCCDecrypt)//encryptOperation==1 解码
{
//得到解密出来的data数据,改变为utf-8的字符串
result = [[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)dataOut length:(NSUInteger)dataOutMoved] encoding:NSUTF8StringEncoding];
}
else //encryptOperation==0 (加密过程中,把加好密的数据转成base64的)
{
//编码 base64
NSData *data = [NSData dataWithBytes:(const void *)dataOut length:(NSUInteger)dataOutMoved];
result = [GTMBase64 stringByEncodingData:data];
}
return [result UTF8String];
}
</code></pre>
iOS中需要用到的GTMBase64库
如果只需要DES加密的话,将Base64去掉即可
END