iOS、后台、Android 三个一致的加密工具 ---------DES加密
首先是JAVA端的加密工具类，它同样适用于Android端，无需任何修改，即可保证Java与Android端的加解密一致，并且中文不会乱码
iOS端 代码 iOS端的加密工具类中引入了“GTMBase64.h”，下面 我写的demo里面 有该类。。
#import
@interface DES3Util : NSObject {
}
// 加密方法
+ (NSString*)encrypt:(NSString*)plainText;
// 解密方法
+ (NSString*)decrypt:(NSString*)encryptText;
@end
#import"DES3Util.h"
#import
#import"GTMBase64.h"
#define gkey@"Mozhe@lx100$#365#$"
#define gIv@"01234567"
@implementationDES3Util
//加密方法
+ (NSString*)encrypt:(NSString*)plainText {
NSData* data = [plainTextdataUsingEncoding:NSUTF8StringEncoding];
size_tplainTextBufferSize = [datalength];
constvoid*vplainText = (constvoid*)[databytes];
CCCryptorStatusccStatus;
uint8_t*bufferPtr =NULL;
size_tbufferPtrSize =0;
size_tmovedBytes =0;
bufferPtrSize = (plainTextBufferSize +kCCBlockSize3DES) & ~(kCCBlockSize3DES-1);
bufferPtr =malloc( bufferPtrSize *sizeof(uint8_t));
memset((void*)bufferPtr,0x0, bufferPtrSize);
constvoid*vkey = (constvoid*) [gkeyUTF8String];
constvoid*vinitVec = (constvoid*) [gIvUTF8String];
ccStatus =CCCrypt(kCCEncrypt,
kCCAlgorithm3DES,
kCCOptionPKCS7Padding,
vkey,
kCCKeySize3DES,
vinitVec,
vplainText,
plainTextBufferSize,
(void*)bufferPtr,
bufferPtrSize,
&movedBytes);
NSData*myData = [NSDatadataWithBytes:(constvoid*)bufferPtrlength:(NSUInteger)movedBytes];
NSString*result = [GTMBase64stringByEncodingData:myData];
returnresult;
}
//解密方法
+ (NSString*)decrypt:(NSString*)encryptText {
NSData*encryptData = [GTMBase64decodeData:[encryptTextdataUsingEncoding:NSUTF8StringEncoding]];
size_tplainTextBufferSize = [encryptDatalength];
constvoid*vplainText = [encryptDatabytes];
CCCryptorStatusccStatus;
uint8_t*bufferPtr =NULL;
size_tbufferPtrSize =0;
size_tmovedBytes =0;
bufferPtrSize = (plainTextBufferSize +kCCBlockSize3DES) & ~(kCCBlockSize3DES-1);
bufferPtr =malloc( bufferPtrSize *sizeof(uint8_t));
memset((void*)bufferPtr,0x0, bufferPtrSize);
constvoid*vkey = (constvoid*) [gkeyUTF8String];
constvoid*vinitVec = (constvoid*) [gIvUTF8String];
ccStatus =CCCrypt(kCCDecrypt,
kCCAlgorithm3DES,
kCCOptionPKCS7Padding,
vkey,
kCCKeySize3DES,
vinitVec,
vplainText,
plainTextBufferSize,
(void*)bufferPtr,
bufferPtrSize,
&movedBytes);
NSString*result = [[NSStringalloc]initWithData:[NSDatadataWithBytes:(constvoid*)bufferPtr
length:(NSUInteger)movedBytes]encoding:NSUTF8StringEncoding];
returnresult;
}
@end
Java端
package org.liuyq.des3;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
/**
* 3DES加密工具类
*
* @author liufeng
* @date 2012-10-11
*/
public class Des3 {
// 密钥
private final static String secretKey = "liuyunqiang@lx100$#365#$";
// 向量
private final static String iv = "01234567";
// 加解密统一使用的编码方式
private final static String encoding = "utf-8";
/**
* 3DES加密
*
* @param plainText 普通文本
* @return
* @throws Exception
*/
public static String encode(String plainText) throws Exception {
Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
byte[] encryptData = cipher.doFinal(plainText.getBytes(encoding));
return Base64.encode(encryptData);
}
/**
* 3DES解密
*
* @param encryptText 加密文本
* @return
* @throws Exception
*/
public static String decode(String encryptText) throws Exception {
Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
byte[] decryptData = cipher.doFinal(Base64.decode(encryptText));
return new String(decryptData, encoding);
}
}
上面的加密工具类会使用到Base64这个类，该类的源代码如下：
package org.liuyq.des3;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* Base64编码工具类
*
* @author liufeng
* @date 2012-10-11
*/
public class Base64 {
private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
public static String encode(byte[] data) {
int start = 0;
int len = data.length;
StringBuffer buf = new StringBuffer(data.length * 3 / 2);
int end = len - 3;
int i = start;
int n = 0;
while (i <= end) {
int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 0x0ff) << 8) | (((int) data[i + 2]) & 0x0ff);
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append(legalChars[d & 63]);
i += 3;
if (n++ >= 14) {
n = 0;
buf.append(" ");
}
}
if (i == start + len - 2) {
int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 255) << 8);
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append("=");
} else if (i == start + len - 1) {
int d = (((int) data[i]) & 0x0ff) << 16;
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append("==");
}
return buf.toString();
}
private static int decode(char c) {
if (c >= 'A' && c <= 'Z')
return ((int) c) - 65;
else if (c >= 'a' && c <= 'z')
return ((int) c) - 97 + 26;
else if (c >= '0' && c <= '9')
return ((int) c) - 48 + 26 + 26;
else
switch (c) {
case '+':
return 62;
case '/':
return 63;
case '=':
return 0;
default:
throw new RuntimeException("unexpected code: " + c);
}
}
/**
* Decodes the given Base64 encoded String to a new byte array. The byte array holding the decoded data is returned.
*/
public static byte[] decode(String s) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
decode(s, bos);
} catch (IOException e) {
throw new RuntimeException();
}
byte[] decodedBytes = bos.toByteArray();
try {
bos.close();
bos = null;
} catch (IOException ex) {
System.err.println("Error while decoding BASE64: " + ex.toString());
}
return decodedBytes;
}
private static void decode(String s, OutputStream os) throws IOException {
int i = 0;
int len = s.length();
while (true) {
while (i < len && s.charAt(i) <= ' ')
i++;
if (i == len)
break;
int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6) + (decode(s.charAt(i + 3)));
os.write((tri >> 16) & 255);
if (s.charAt(i + 2) == '=')
break;
os.write((tri >> 8) & 255);
if (s.charAt(i + 3) == '=')
break;
os.write(tri & 255);
i += 4;
}
}
}
#import
@interfaceDES3Util :NSObject
//加密方法
+ (NSString*)encrypt:(NSString*)plainText;
//解密方法
+ (NSString*)decrypt:(NSString*)encryptText;
@end#import
@interfaceDES3Util :NSObject
//加密方法
+ (NSString*)encrypt:(NSString*)plainText;
//解密方法
+ (NSString*)decrypt:(NSString*)encryptText;
@end
