iOS md5 32位加密（区分大小写）

#import "NSString+change.h"
#import <CommonCrypto/CommonDigest.h>
@implementation NSString (change)
- (NSString*)md532BitLower
{
    const char *cStr = [self UTF8String];
    unsigned char result[16];
    
    NSNumber *num = [NSNumber numberWithUnsignedLong:strlen(cStr)];
    CC_MD5( cStr,[num intValue], result );
    
    return [[NSString stringWithFormat:
             @"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
             result[0], result[1], result[2], result[3],
             result[4], result[5], result[6], result[7],
             result[8], result[9], result[10], result[11],
             result[12], result[13], result[14], result[15]
             ] lowercaseString];
}
- (NSString*)md532BitUpper
{
    const char *cStr = [self UTF8String];
    unsigned char result[16];
    
    NSNumber *num = [NSNumber numberWithUnsignedLong:strlen(cStr)];
    CC_MD5( cStr,[num intValue], result );
    
    return [[NSString stringWithFormat:
             @"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
             result[0], result[1], result[2], result[3],
             result[4], result[5], result[6], result[7],
             result[8], result[9], result[10], result[11],
             result[12], result[13], result[14], result[15]
             ] uppercaseString];
}
@end