//
//  NSString+MD5.m
//  RestKit
//
//  Created by Jeff Arena on 4/4/11.
//  Copyright 2011 Two Toasters
//  
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//  
//  http://www.apache.org/licenses/LICENSE-2.0
//  
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

#import <CommonCrypto/CommonDigest.h>
#import "NSString+MD5.h"
#import "RKFixCategoryBug.h"

RK_FIX_CATEGORY_BUG(NSString_MD5)

@implementation NSString (MD5)

- (NSString*)MD5 {
	// Create pointer to the string as UTF8
	const char* ptr = [self UTF8String];

	// Create byte array of unsigned chars
	unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH];

	// Create 16 byte MD5 hash value, store in buffer
	CC_MD5(ptr, (CC_LONG) strlen(ptr), md5Buffer);

	// Convert MD5 value in the buffer to NSString of hex values
	NSMutableString* output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
	for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
		[output appendFormat:@"%02x",md5Buffer[i]];
	}

	return output;
}

@end