ios DES加密
注意，要更改key值
.h文件
#import <Foundation/Foundation.h>
/******字符串转base64（包括DES加密）******/
#define __BASE64( text ) [Base64codeFunc base64StringFromText:text]
/******base64（通过DES解密）转字符串******/
#define __TEXT( base64 ) [Base64codeFunc textFromBase64String:base64]
@interface Base64codeFunc : NSObject
/************************************************************
函数名称 : + (NSString *)base64StringFromText:(NSString *)text
函数描述 : 将文本转换为base64格式字符串
输入参数 : (NSString *)text 文本
输出参数 : N/A
返回参数 : (NSString *) base64格式字符串
备注信息 :
**********************************************************/
+ (NSString *)base64StringFromText:(NSString *)text;
/************************************************************
函数名称 : + (NSString *)textFromBase64String:(NSString *)base64
函数描述 : 将base64格式字符串转换为文本
输入参数 : (NSString *)base64 base64格式字符串
输出参数 : N/A
返回参数 : (NSString *) 文本
备注信息 :
**********************************************************/
+ (NSString *)textFromBase64String:(NSString *)base64;
.m文件
#import "Base64codeFunc.h"//引入IOS自带密码库
#import <CommonCrypto/CommonCryptor.h>//空字符串
#define LocalStr_None @""
#define DESKey @"lotyun00"
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
@implementation Base64codeFunc+ (NSString *)base64StringFromText:(NSString *)text
{ if (text && ![text isEqualToString:LocalStr_None]) {
NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];
//IOS 自带DES加密 Begin
data = [self DESEncrypt:data DESKey];
//IOS 自带DES加密 End
return [self base64EncodedStringFrom:data];
} else {
return LocalStr_None;
}
}
+ (NSString *)textFromBase64String:(NSString *)base64
{
if (base64 && ![base64 isEqualToString:LocalStr_None]) {
NSData *data = [self dataWithBase64EncodedString:base64];
//IOS 自带DES解密 Begin
data = [self DESDecrypt:data DESKey];
//IOS 自带DES加密 End
return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}
else { return LocalStr_None;
}
}
/************************************************************
函数名称 : + (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
函数描述 : 文本数据进行DES加密
输入参数 : (NSData *)data
(NSString *)key
输出参数 : N/A
返回参数 : (NSData *)
备注信息 : 此函数不可用于过长文本
**********************************************************/
+ (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
{ char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [data length];
size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeDES,
NULL,
[data bytes], dataLength,
buffer, bufferSize, &numBytesEncrypted); if (cryptStatus == kCCSuccess) { return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free(buffer);
return nil;
}
/************************************************************
函数名称 : + (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
函数描述 : 文本数据进行DES解密
输入参数 : (NSData *)data
(NSString *)key
输出参数 : N/A
返回参数 : (NSData *)
备注信息 : 此函数不可用于过长文本
**********************************************************/
+ (NSData *)DESDecrypt:(NSData *)data WithKey:(NSString *)key
{ char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [data length];
size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize);
size_t numBytesDecrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeDES,
NULL,
[data bytes], dataLength,
buffer, bufferSize, &numBytesDecrypted);
if (cryptStatus == kCCSuccess)
{
return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
}
free(buffer);
return nil;
}
/************************************************************
函数名称 : + (NSData *)dataWithBase64EncodedString:(NSString *)string
函数描述 : base64格式字符串转换为文本数据
输入参数 : (NSString *)string
输出参数 : N/A
返回参数 : (NSData *)
备注信息 :
**********************************************************/
+ (NSData *)dataWithBase64EncodedString:(NSString *)string{
if (string == nil)
[NSException raise:NSInvalidArgumentException format:nil];
if ([string length] == 0)
return [NSData data];
static char *decodingTable = NULL;
if (decodingTable == NULL)
{
decodingTable = malloc(256);
if (decodingTable == NULL)
return nil;
memset(decodingTable,
CHAR_MAX, 256);
NSUInteger i;
for (i = 0; i < 64; i++)
decodingTable[(short)encodingTable[i]] = i;
}
const char *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];
if (characters == NULL)
// Not an ASCII string!
return nil;
char *bytes = malloc((([string length] + 3) / 4) * 3);
if (bytes == NULL)
return nil;
NSUInteger length = 0;
NSUInteger i = 0;
while (YES)
{
char buffer[4];
short bufferLength;
for (bufferLength = 0; bufferLength < 4; i++)
{
if (characters[i] == '\0')
break;
if (isspace(characters[i]) || characters[i] == '=') continue;
buffer[bufferLength] = decodingTable[(short)characters[i]]; if (buffer[bufferLength++] == CHAR_MAX)
// Illegal character! {
free(bytes);
return nil;
}
}
if (bufferLength == 0)
break;
if (bufferLength == 1)
// At least two characters are needed to produce one byte! {
free(bytes);
return nil;
}
// Decode the characters in the buffer to bytes.
bytes[length++] = (buffer[0] << 2) | (buffer[1] >> 4);
if (bufferLength > 2)
bytes[length++] = (buffer[1] << 4) | (buffer[2] >> 2);
if (bufferLength > 3)
bytes[length++] = (buffer[2] << 6) | buffer[3];
}
bytes = realloc(bytes, length);
return [NSData dataWithBytesNoCopy:bytes length:length];
}
/************************************************************
函数名称 : + (NSString *)base64EncodedStringFrom:(NSData *)data
函数描述 : 文本数据转换为base64格式字符串
输入参数 : (NSData *)data
输出参数 : N/A
返回参数 : (NSString *)
备注信息 :
**********************************************************/+ (NSString *)base64EncodedStringFrom:(NSData *)data
{ if ([data length] == 0)
return @"";
char *characters = malloc((([data length] + 2) / 3) * 4);
if (characters == NULL)
return nil;
NSUInteger length = 0;
NSUInteger i = 0;
while (i < [data length])
{
char buffer[3] = {0,0,0};
short bufferLength = 0;
while (bufferLength < 3 && i < [data length])
buffer[bufferLength++] = ((char *)[data bytes])[i++];
// Encode the bytes in the buffer to four characters, including padding "=" characters if necessary.
characters[length++] = encodingTable[(buffer[0] & 0xFC) >> 2];
characters[length++] = encodingTable[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];
if (bufferLength > 1)
characters[length++] = encodingTable[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];
else characters[length++] = '=';
if (bufferLength > 2)
characters[length++] = encodingTable[buffer[2] & 0x3F]; else characters[length++] = '=';
}
return [[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES];
}
@end
使用方法非常简单
NSString *string = @"需要加密的字符串";//加密后的字符串NSString *encodeString = nil;//解密后的字符串NSString *decodeString = nil;- (void)stringToBase64
{
encodeString = __BASE64(string);
}- (void)base64ToString
{
decodeString = __TEXT(encodeString);
}
转自：http://www.cnblogs.com/xiaobaizhu/p/3453055.html