NSData category for generating hexadecimal string representation

NSData+ADVHexadecimalRepresentation.h

//
//  Copyright © 2012 Yuri Kotov
//

#import <Foundation/Foundation.h>

@interface NSData (ADVHexadecimalRepresentation)

- (NSString *) hexadecimalRepresentation;

@end

NSData+ADVHexadecimalRepresentation.m

//
//  Copyright © 2012 Yuri Kotov
//

#import "NSData+ADVHexadecimalRepresentation.h"

@implementation NSData (ADVHexadecimalRepresentation)

- (NSString *) hexadecimalRepresentation
{
    const char *bytes = [self bytes];
    NSUInteger length = [self length];
    NSMutableString *string = [NSMutableString stringWithCapacity:(2 * length)];
    for (NSUInteger i = 0; i < length; ++i)
    {
        [string appendFormat:@"%02hhx", bytes[i]];
    }
    return string;
}

@end