Have a look at libs-base/Source/Additions/NSData+GNUstepBase.m
> Am 01.04.2020 um 19:46 schrieb H. Nikolaus Schaller <h...@goldelico.com>:
>
>>
>> Am 01.04.2020 um 19:43 schrieb Andreas Höschler <ahoe...@smartsoft.de>:
>>
>> Hi all,
>>
>> I have the following NSString category
>>
>> @implementation NSString (NSStringJsonExtension)
>>
>> - (NSString *)md5
>> {
>> #ifdef __APPLE__
>> const char *cStr = [self UTF8String];
>> unsigned char result[CC_MD5_DIGEST_LENGTH];
>> CC_MD5( cStr, (int)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]
>> ];
>> #else
>> NSLog(@"md5 not yet supported on GNUstep. Please implement");
>
> https://linux.die.net/man/3/md5_init
>
> maybe
> unsigned char *MD5(cStr, strlen(cStr), result);
>
> You need to install openssl devel packages.
>
>
>> return nil;
>> #endif
>> }
>>
>> @end
>>
>> working on MacOSX (neede to access HkVision cameras).
>>
>> I would like to port this app to GNUstep and therefore need code that builds
>> on Ubuntu (current GNUstep tree). The above code gives
>>
>> SRHTTPRequest.m:93:27: error: 'CC_MD5_DIGEST_LENGTH' undeclared (first use
>> in this function)
>> unsigned char result[CC_MD5_DIGEST_LENGTH];
>> ^
>> SRHTTPRequest.m:93:27: note: each undeclared identifier is reported only
>> once for each function it appears in
>> SRHTTPRequest.m:94:6: warning: implicit declaration of function 'CC_MD5'
>> [-Wimplicit-function-declaration]
>> CC_MD5( cStr, (int)strlen(cStr), result ); // This is the md5 call
>> ^
>> Any idea how to do md5 hashing on Linux/GNUstep?
>>
>> Thanks a lot in advance!
>>
>> Andreas
