//

//  CommonFunc.m

//  PRJ_base64

//

//  Created by wangzhipeng on 12-11-29.

//  Copyright (c) 2012年 com.comsoft. All rights reserved.

//

#import "MyBase64.h"

//引入IOS自带密码库

#import

//空字符串

#define LocalStr_None   @""

static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

@implementation MyBase64 : NSObject

+ (NSString *)base64StringFromText:(NSString *)text

{

if (text && ![text isEqualToString:LocalStr_None]) {

//取项目的bundleIdentifier作为KEY  改动了此处

//NSString *key = [[NSBundle mainBundle] bundleIdentifier];

NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];

//IOS 自带DES加密 Begin  改动了此处

//data = [self DESEncrypt:data WithKey:key];

//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]) {

//取项目的bundleIdentifier作为KEY   改动了此处

//NSString *key = [[NSBundle mainBundle] bundleIdentifier];

NSData *data = [self dataWithBase64EncodedString:base64];

//IOS 自带DES解密 Begin    改动了此处

//data = [self DESDecrypt:data WithKey:key];

//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