ios MD5大小写加密

#import "NSString+change.h"
#import <CommonCrypto/CommonDigest.h>
@implementation NSString (change)
//小写
- (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];
}

//大写
- (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