iOS DES ECB模式对称加密解密
最近忙于android和iOS的项目，写完了android的DES 的ECB模式加密解密（相关连接：http://blog.csdn.net/vipa1888/article/details/8086037），又回到了Ios上面，因为本人也是最近今年开始研究ios的，所以Ios上面好多东西都不懂，进过了半年的研究，终于吧ios的DES 的ECB模式对称加密解密搞定了，本人遇到的问题很严重的问题，网上写的好多16进制数转化位字节都有问题的，经过本人研究发现他们有一个地方写错了，导致解密后的NSString
位null，我的代码已经修复了这个问题，下面贴出源代码供大家参考：
加密类的实现类：
实现类：
首先贴出加密类的头文件：
// // DesUtil.h // Author:spring sky // QQ:840950105 // Email:vipa1888@163.com // #import <Foundation/Foundation.h> @interface DesUtil : NSObject /** DES加密 */ +(NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key; /** DES解密 */ +(NSString *) decryptUseDES:(NSString *)plainText key:(NSString *)key; @end
加密类的实现类：
//
// DesUtil.m
// Author:spring sky
// QQ:840950105
// Email:vipa1888@163.com
//
#import "DesUtil.h"
#import <CommonCrypto/CommonCryptor.h>
#import "ConverUtil.h"
@implementation DesUtil
static Byte iv[] = {1,2,3,4,5,6,7,8};
/*
DES加密
*/
+(NSString *) encryptUseDES:(NSString *)clearText key:(NSString *)key
{
NSString *ciphertext = nil;
NSData *textData = [clearText dataUsingEncoding:NSUTF8StringEncoding];
NSUInteger dataLength = [clearText length];
unsigned char buffer[1024];
memset(buffer, 0, sizeof(char));
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,
kCCOptionECBMode,
[key UTF8String], kCCKeySizeDES,
iv,
[textData bytes] , dataLength,
buffer, 1024,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
NSLog(@"DES加密成功");
NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
Byte* bb = (Byte*)[data bytes];
ciphertext = [ConverUtil parseByteArray2HexString:bb];
}else{
NSLog(@"DES加密失败");
}
return ciphertext;
}
/**
DES解密
*/
+(NSString *) decryptUseDES:(NSString *)plainText key:(NSString *)key
{
NSString *cleartext = nil;
NSData *textData = [ConverUtil parseHexToByteArray:plainText];
NSUInteger dataLength = [textData length];
unsigned char buffer[1024];
memset(buffer, 0, sizeof(char));
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES,
kCCOptionECBMode,
[key UTF8String], kCCKeySizeDES,
iv,
[textData bytes] , dataLength,
buffer, 1024,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
NSLog(@"DES解密成功");
NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
cleartext = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}else{
NSLog(@"DES解密失败");
}
return cleartext;
}
@end
下面是转码类，主要是16进制和字节的转化
头文件：
// // ConverUtil.h // Author:spring sky // QQ:840950105 // Email:vipa1888@163.com // #import <Foundation/Foundation.h> @interface ConverUtil : NSObject /** 64编码 */ +(NSString *)base64Encoding:(NSData*) text; /** 字节转化为16进制数 */ +(NSString *) parseByte2HexString:(Byte *) bytes; /** 字节数组转化16进制数 */ +(NSString *) parseByteArray2HexString:(Byte[]) bytes; /* 将16进制数据转化成NSData 数组 */ +(NSData*) parseHexToByteArray:(NSString*) hexString; @end
实现类：
//
// ConverUtil.m
// Author:spring sky
// QQ:840950105
// Email:vipa1888@163.com
//
#import "ConverUtil.h"
@implementation ConverUtil
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/**
64编码
*/
+(NSString *)base64Encoding:(NSData*) text
{
if (text.length == 0)
return @"";
char *characters = malloc(text.length*3/2);
if (characters == NULL)
return @"";
int end = text.length - 3;
int index = 0;
int charCount = 0;
int n = 0;
while (index <= end) {
int d = (((int)(((char *)[text bytes])[index]) & 0x0ff) << 16)
| (((int)(((char *)[text bytes])[index + 1]) & 0x0ff) << 8)
| ((int)(((char *)[text bytes])[index + 2]) & 0x0ff);
characters[charCount++] = encodingTable[(d >> 18) & 63];
characters[charCount++] = encodingTable[(d >> 12) & 63];
characters[charCount++] = encodingTable[(d >> 6) & 63];
characters[charCount++] = encodingTable[d & 63];
index += 3;
if(n++ >= 14)
{
n = 0;
characters[charCount++] = ' ';
}
}
if(index == text.length - 2)
{
int d = (((int)(((char *)[text bytes])[index]) & 0x0ff) << 16)
| (((int)(((char *)[text bytes])[index + 1]) & 255) << 8);
characters[charCount++] = encodingTable[(d >> 18) & 63];
characters[charCount++] = encodingTable[(d >> 12) & 63];
characters[charCount++] = encodingTable[(d >> 6) & 63];
characters[charCount++] = '=';
}
else if(index == text.length - 1)
{
int d = ((int)(((char *)[text bytes])[index]) & 0x0ff) << 16;
characters[charCount++] = encodingTable[(d >> 18) & 63];
characters[charCount++] = encodingTable[(d >> 12) & 63];
characters[charCount++] = '=';
characters[charCount++] = '=';
}
NSString * rtnStr = [[NSString alloc] initWithBytesNoCopy:characters length:charCount encoding:NSUTF8StringEncoding freeWhenDone:YES];
return rtnStr;
}
/**
字节转化为16进制数
*/
+(NSString *) parseByte2HexString:(Byte *) bytes
{
NSMutableString *hexStr = [[NSMutableString alloc]init];
int i = 0;
if(bytes)
{
while (bytes[i] != '\0')
{
NSString *hexByte = [NSString stringWithFormat:@"%x",bytes[i] & 0xff];///16进制数
if([hexByte length]==1)
[hexStr appendFormat:@"0%@", hexByte];
else
[hexStr appendFormat:@"%@", hexByte];
i++;
}
}
NSLog(@"bytes 的16进制数为:%@",hexStr);
return hexStr;
}
/**
字节数组转化16进制数
*/
+(NSString *) parseByteArray2HexString:(Byte[]) bytes
{
NSMutableString *hexStr = [[NSMutableString alloc]init];
int i = 0;
if(bytes)
{
while (bytes[i] != '\0')
{
NSString *hexByte = [NSString stringWithFormat:@"%x",bytes[i] & 0xff];///16进制数
if([hexByte length]==1)
[hexStr appendFormat:@"0%@", hexByte];
else
[hexStr appendFormat:@"%@", hexByte];
i++;
}
}
NSLog(@"bytes 的16进制数为:%@",hexStr);
return [hexStr uppercaseString];
}
/*
将16进制数据转化成NSData 数组
*/
+(NSData*) parseHexToByteArray:(NSString*) hexString
{
int j=0;
Byte bytes[hexString.length];
for(int i=0;i<[hexString length];i++)
{
int int_ch; /// 两位16进制数转化后的10进制数
unichar hex_char1 = [hexString characterAtIndex:i]; ////两位16进制数中的第一位(高位*16)
int int_ch1;
if(hex_char1 >= '0' && hex_char1 <='9')
int_ch1 = (hex_char1-48)*16; //// 0 的Ascll - 48
else if(hex_char1 >= 'A' && hex_char1 <='F')
int_ch1 = (hex_char1-55)*16; //// A 的Ascll - 65
else
int_ch1 = (hex_char1-87)*16; //// a 的Ascll - 97
i++;
unichar hex_char2 = [hexString characterAtIndex:i]; ///两位16进制数中的第二位(低位)
int int_ch2;
if(hex_char2 >= '0' && hex_char2 <='9')
int_ch2 = (hex_char2-48); //// 0 的Ascll - 48
else if(hex_char2 >= 'A' && hex_char1 <='F')
int_ch2 = hex_char2-55; //// A 的Ascll - 65
else
int_ch2 = hex_char2-87; //// a 的Ascll - 97
int_ch = int_ch1+int_ch2;
bytes[j] = int_ch; ///将转化后的数放入Byte数组里
j++;
}
NSData *newData = [[NSData alloc] initWithBytes:bytes length:hexString.length/2];
NSLog(@"newData=%@",newData);
return newData;
}
@end
测试结果：
2012-10-18 19:58:41.592 [3356:707] 明文 = 1PALMPAY key = 12345678
2012-10-18 19:58:41.599 [3356:707] DES加密成功
2012-10-18 19:58:41.601 [3356:707] bytes 的16进制数为:0be9d717b1478b32
2012-10-18 19:58:41.603 [3356:707] 加密后的数据：0BE9D717B1478B32
2012-10-18 19:58:41.604 [3356:707] newData=<0be9d717 b1478b32>
2012-10-18 19:58:41.607 [3356:707] DES解密成功
2012-10-18 19:58:41.608 [3356:707] 解密后的数据：1PALMPAY
本人的工作内容主要是银行金融方面，所以经常会使用到各种的加密解密，如果有需要帮助的朋友可以联系我，如果我能搞定的，一定尽力而已！
欢迎转载，但是必须保留版权！
