AES:encryption in objective c and php

[mramin05]

Hi guys,
in my project I have to encrypt some data and have to get in php to save in server.

Please suggest me any tutorial.

I have searched a lot but could not find sutable tutorial.

Thanks a lot.

[mramin05]

Originally Posted by mramin05

Hi guys,
in my project I have to encrypt some data and have to get in php to save in server.

Thanks a lot.

#import <CommonCrypto/CommonCryptor.h>

 - (void)viewDidLoad {

	 NSString *text = @"my password";
	 NSString *secretKey = @"1234567812345678";
	
	 [self encryptString:text withKey:secretKey ];
	 
	 
	 [super viewDidLoad];
 }
- (NSData*) encryptString:(NSString*)plaintext withKey:(NSString*)key {
	return [[plaintext dataUsingEncoding:NSUTF8StringEncoding] AES256EncryptWithKey:key];

}

- (NSString*) decryptData:(NSData*)ciphertext withKey:(NSString*)key {
	return [[[NSString alloc] initWithData:[ciphertext AES256DecryptWithKey:key]
								  encoding:NSUTF8StringEncoding] autorelease];
}

But it show me the error

[NSConcreteMutableData AES256EncryptWithKey:]: unrecognized selector sent to instance 0x5f4f2d0
2010-10-04 12:17:59.507 test[1030:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSConcreteMutableData AES256EncryptWithKey:]: unrecognized selector sent to instance 0x5f4f2d0'

Please help me..
Thanks in advance.

[makami]

UP!

Any news about it ?

[mramin05]

Originally Posted by makami

UP!

Any news about it ?

No success yet.
Please help.... anybody.. with any tutorial for AES will be grest help.

[Ciechan]

I guess you are missing category on NSData, there are no AES256EncryptWithKey and AES256DecryptWithKey methods by default.

Here's are the files:

NSDataEncryption.h

#import <Foundation/Foundation.h>


@interface NSData (AES256)

- (NSData *)AES256EncryptWithKey:(NSString *)key;
- (NSData *)AES256DecryptWithKey:(NSString *)key;

@end

NSDataEncryption.m

#import "NSDataEncryption.h"

#import <CommonCrypto/CommonCryptor.h>

@implementation NSData (AES256)

- (NSData *)AES256EncryptWithKey:(NSString *)key {
	// 'key' should be 32 bytes for AES256, will be null-padded otherwise
	char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused)
	bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)
	
	// fetch key data
	[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
	
	NSUInteger dataLength = [self length];
	
	//See the doc: For block ciphers, the output size will always be less than or 
	//equal to the input size plus the size of one block.
	//That's why we need to add the size of one block here
	size_t bufferSize = dataLength + kCCBlockSizeAES128;
	void *buffer = malloc(bufferSize);
	
	size_t numBytesEncrypted = 0;
	CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
										  keyPtr, kCCKeySizeAES256,
										  NULL /* initialization vector (optional) */,
										  [self bytes], dataLength, /* input */
										  buffer, bufferSize, /* output */
										  &numBytesEncrypted);
	if (cryptStatus == kCCSuccess) {
		//the returned NSData takes ownership of the buffer and will free it on deallocation
		return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
	}
	
	free(buffer); //free the buffer;
	return nil;
}

- (NSData *)AES256DecryptWithKey:(NSString *)key {
	// 'key' should be 32 bytes for AES256, will be null-padded otherwise
	char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused)
	bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)
	
	// fetch key data
	[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
	
	NSUInteger dataLength = [self length];
	
	//See the doc: For block ciphers, the output size will always be less than or 
	//equal to the input size plus the size of one block.
	//That's why we need to add the size of one block here
	size_t bufferSize = dataLength + kCCBlockSizeAES128;
	void *buffer = malloc(bufferSize);
	
	size_t numBytesDecrypted = 0;
	CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
										  keyPtr, kCCKeySizeAES256,
										  NULL /* initialization vector (optional) */,
										  [self bytes], dataLength, /* input */
										  buffer, bufferSize, /* output */
										  &numBytesDecrypted);
	
	if (cryptStatus == kCCSuccess) {
		//the returned NSData takes ownership of the buffer and will free it on deallocation
		return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
	}
	
	free(buffer); //free the buffer;
	return nil;
}

@end

Then just import header file.

[mramin05]

Originally Posted by Ciechan

I guess you are missing category on NSData, there are no AES256EncryptWithKey and AES256DecryptWithKey methods by default.

@end[/code]

Then just import header file.

Thx a lot.

[BerndderHeld]

I Use this method to encrypt a password for a XML-API. My Problem is that i cant encode the NSDATA with the Cipher to a proper plain String.

How do you use this?

[Metsdev]

can u give php code for encryption for this method ?

[Metsdev]

Originally Posted by mramin05

Thx a lot.

what is the php code to encrypt data ?

[SolomiyaN2]

Originally Posted by BerndderHeld

I Use this method to encrypt a password for a XML-API. My Problem is that i cant encode the NSDATA with the Cipher to a proper plain String.

How do you use this?

I've got the same issue. In spite of the fact that decrypted string equals initial one I would like to be able to cast nsdata to proper nsstring.
Have you managed to solve this problem? Or did you find any other solution for that?

Thank you in adnvance