//

//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{returnLocalStr_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{returnLocalStr_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);returnnil;

}/******************************************************************************

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);returnnil;

}/******************************************************************************

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)returnnil;

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!

returnnil;char *bytes = malloc((([string length] + 3) / 4) * 3);if (bytes ==NULL)returnnil;

NSUInteger length= 0;

NSUInteger i= 0;while(YES)

{char buffer[4];shortbufferLength;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);returnnil;

}

}if (bufferLength == 0)break;if (bufferLength == 1) //At least two characters are needed to produce one byte!

{

free(bytes);returnnil;

}//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)returnnil;

NSUInteger length= 0;

NSUInteger i= 0;while (i

{char buffer[3] = {0,0,0};short bufferLength = 0;while (bufferLength < 3 && i

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