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@interface NSString (MyExtensions)

- (NSString *) md5;
@end

@interface NSData (MyExtensions)

- (NSString *) md5;
@end

#import <CommonCrypto/CommonDigest.h>
@implementation NSString (MyExtensions)

- (NSString *) md5{
    const char *cStr = [self UTF8String];
    unsigned char result[16];
    CC_MD5 ( cStr , strlen ( cStr ) , result ); // This is the md5 call
    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]];
}
@end

@implementation NSData (MyExtensions)

- (NSString *) md5{
    unsigned char result[16];
    CC_MD5 ( self.bytes , self.length , result ); // This is the md5 call
    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]];
}
@end