iOS base64 加密解密通用类实例代码

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我是靠谱客的博主威武身影，最近开发中收集的这篇文章主要介绍iOS base64 加密解密通用类实例代码，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

在使用过程中，直接将被类引入到项目中即可，不需要其它辅助类。

使用示例：将此通用类的头文件引入到目标类后，直接使用类名进行调用即可。

NSString *str = [NSString stringWithFormat:@"YWE="]; 
  NSString *str1 = [NSString stringWithFormat:@"aa"]; 
  NSLog(@"resultStr========%@",[CommonFunc textFromBase64String:str]);  //使用类名进行调用 
  NSLog(@"resultStr=========%@",[CommonFunc base64StringFromText:str1]); //使用类名进行调用

源码下载：

在项目中遇到字符串的base64编解码，分享一下工具类：

JKCommonFunc.h

#define __BASE64( text )    [CommonFunc base64StringFromText:text] 
#define __TEXT( base64 )    [CommonFunc textFromBase64String:base64] 
#import <Foundation/Foundation.h> 
@interface JKCommonFunc : 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

JKCommonFunc.m

#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 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;  
  voidvoid *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;  
  voidvoid *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 charchar *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 charchar *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];  
  if (characters == NULL)   // Not an ASCII string!  
    return nil;  
  charchar *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] == '')  
        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 @"";  
  charchar *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++] = ((charchar *)[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