During use, you can directly introduce the class into the project without any other auxiliary classes.
Example of usage: After introducing the header file of this common class to the target class, just use the class name to call it directly.
NSString *str = [NSString stringWithFormat:@"YWE="]; NSString *str1 = [NSString stringWithFormat:@"aa"]; NSLog(@"resultStr========%@",[CommonFunc textFromBase64String:str]); //Calling with class name NSLog(@"resultStr=========%@",[CommonFunc base64StringFromText:str1]); //Calling with class name
Source code download:
When you encounter base64 codec of strings in the project, share the tool class:
#define __BASE64( text ) [CommonFunc base64StringFromText:text] #define __TEXT( base64 ) [CommonFunc textFromBase64String:base64] #import <Foundation/> @interface JKCommonFunc : NSObject /****************************************************************************** Function name: + (NSString *)base64StringFromText:(NSString *)text Function Description: Convert text to base64 format string Input parameters: (NSString *)text text Output parameters: N/A Return parameter: (NSString *) base64 format string Notes: ********************************************************************************* + (NSString *)base64StringFromText:(NSString *)text; /****************************************************************************** Function name: + (NSString *)textFromBase64String:(NSString *)base64 Function Description: Convert base64 format string to text Input parameters: (NSString *)base64 base64 format string Output parameters: N/A Return parameter: (NSString *) text Notes: ********************************************************************************* + (NSString *)textFromBase64String:(NSString *)base64; @end
#import ""
//Introduce the IOS own password library#import <CommonCrypto/>
//Empty string#define LocalStr_None @""
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
@implementation CommonFunc
+ (NSString *)base64StringFromText:(NSString *)text
{
if (text && ![text isEqualToString:LocalStr_None]) {
//The bundleIdentifier of the project is changed as KEY //NSString *key = [[NSBundle mainBundle] bundleIdentifier];
NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];
//IOS comes with DES encryption Begin has changed here //data = [self DESEncrypt:data WithKey:key];
//IOS comes with DES encryption End return [self base64EncodedStringFrom:data];
}
else {
return LocalStr_None;
}
}
+ (NSString *)textFromBase64String:(NSString *)base64
{
if (base64 && ![base64 isEqualToString:LocalStr_None]) {
//The bundleIdentifier of the project is changed as KEY //NSString *key = [[NSBundle mainBundle] bundleIdentifier];
NSData *data = [self dataWithBase64EncodedString:base64];
//IOS comes with DES decryption Begin has changed here //data = [self DESDecrypt:data WithKey:key];
//IOS comes with DES encryption End return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}
else {
return LocalStr_None;
}
}
/******************************************************************************
Function name: + (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
Function Description: DES encryption of text data
Input parameters: (NSData *)data
(NSString *)key
Output parameters: N/A
Return parameter: (NSData *)
Note: This function cannot be used for excessively long text
*********************************************************************************
+ (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;
}
/******************************************************************************
Function name: + (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
Function Description: DES decryption of text data
Input parameters: (NSData *)data
(NSString *)key
Output parameters: N/A
Return parameter: (NSData *)
Note: This function cannot be used for excessively long text
*********************************************************************************
+ (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;
}
/******************************************************************************
Function name: + (NSData *)dataWithBase64EncodedString:(NSString *)string
Function Description: Convert base64 format string to text data
Input parameters: (NSString *)string
Output parameters: N/A
Return parameter: (NSData *)
Notes:
*********************************************************************************
+ (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] == '\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];
}
/******************************************************************************
Function name: + (NSString *)base64EncodedStringFrom:(NSData *)data
Function Description: Convert text data to base64 format string
Input parameters: (NSData *)data
Output parameters: N/A
Return parameter: (NSString *)
Notes:
*********************************************************************************
+ (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