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博文原创,转载请声明出处
电子咖啡(原id蓝岩)
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在项目中遇到字符串的base64编解码,分享一下工具类:
CommonFunc.h
- //
- // CommonFunc.h
- // PRJ_base64
- //
- // Created by wangzhipeng on 12-11-29.
- // Copyright (c) 2012年 com.comsoft. All rights reserved.
- //
- #import <Foundation/Foundation.h>
- #define __BASE64( text ) [CommonFunc base64StringFromText:text]
- #define __TEXT( base64 ) [CommonFunc textFromBase64String:base64]
- @interface CommonFunc : 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;
- @end
//
// CommonFunc.h
// PRJ_base64
//
// Created by wangzhipeng on 12-11-29.
// Copyright (c) 2012年 com.comsoft. All rights reserved.
//
#import <Foundation/Foundation.h>
#define __BASE64( text ) [CommonFunc base64StringFromText:text]
#define __TEXT( base64 ) [CommonFunc textFromBase64String:base64]
@interface CommonFunc : 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;
@end
CommonFunc.m
- //
- // CommonFunc.m
- // PRJ_base64
- //
- // Created by wangzhipeng on 12-11-29.
- // Copyright (c) 2012年 com.comsoft. All rights reserved.
- //
- #import "CommonFunc.h"
- //引入IOS自带密码库
- #import <CommonCrypto/CommonCryptor.h>
- //空字符串
- #define LocalStr_None @""
- static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
- @implementation CommonFunc
- + (NSString *)base64StringFromText:(NSString *)text
- {
- if (text && ![text isEqualToString:LocalStr_None]) {
- //取项目的bundleIdentifier作为KEY
- NSString *key = [[NSBundle mainBundle] bundleIdentifier];
- NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];
- //IOS 自带DES加密 Begin
- 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
- NSString *key = [[NSBundle mainBundle] bundleIdentifier];
- NSData *data = [self dataWithBase64EncodedString:base64];
- //IOS 自带DES解密 Begin
- 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
http://blog.youkuaiyun.com/shencaifeixia1/article/details/8530884