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NSData+EvernoteSDK.m
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NSData+EvernoteSDK.m
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/*
* NSData+EvernoteSDK.m
* evernote-sdk-ios
*
* Copyright 2012 Evernote Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "NSData+EvernoteSDK.h"
#import <CommonCrypto/CommonCrypto.h>
@implementation NSData (EvernoteSDK)
- (NSData *) enmd5
{
unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH];
CC_MD5(self.bytes, (CC_LONG)self.length, md5Buffer);
NSMutableData * md5Data = [NSMutableData dataWithBytes:md5Buffer length: CC_MD5_DIGEST_LENGTH];
return md5Data;
}
- (NSString *) enlowercaseHexDigits
{
unsigned const char * bytes = [self bytes];
NSMutableString * hex = [NSMutableString stringWithCapacity: [self length] * 2];
NSUInteger i;
for (i = 0; i < [self length]; i++) {
[hex appendFormat: @"%.2x", bytes[i]];
}
return hex;
}
+ (NSData *) endataWithHexDigits: (NSString *) hexDigits
{
if (!hexDigits) {
return nil;
}
if ([hexDigits length] % 2 != 0) {
return nil;
}
NSMutableData * data = [NSMutableData dataWithLength: [hexDigits length] / 2];
const char * sourceBytes = [hexDigits cStringUsingEncoding: NSASCIIStringEncoding];
unsigned char * bytes = [data mutableBytes];
const char * pos = sourceBytes;
for (NSUInteger count = 0; count < [hexDigits length] / 2; count++) {
sscanf(pos, "%2hhx", &bytes[count]);
pos += 2;
}
return [NSData dataWithData:data];
}
@end