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
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