Re: generating sha256 hashes with openssl?
- From: Dave <davidct1209@xxxxxxxxx>
- To: "programmingblind@xxxxxxxxxxxxx" <programmingblind@xxxxxxxxxxxxx>
- Date: Sun, 22 Aug 2010 20:02:27 -0700
Yes. I understand that. Just some suggestions for narrowing down the issues.
Without running it through a debugger, it's hard to diagnose.
Sent from my iPhone
On Aug 22, 2010, at 6:44 PM, "Littlefield, Tyler" <tyler@xxxxxxxxxxxxx> wrote:
> not deleting will just lead to leaking memory--std::string has to strcpy or
> memcpy or something after you use '='. And it's def overloaded, otherwise
> that wouldn't work.
>
> ----- Original Message ----- From: "Dave" <davidct1209@xxxxxxxxx>
> To: <programmingblind@xxxxxxxxxxxxx>
> Cc: <programmingblind@xxxxxxxxxxxxx>
> Sent: Sunday, August 22, 2010 7:28 PM
> Subject: Re: generating sha256 hashes with openssl?
>
>
> Try removing the delete call.
>
> Sent from my iPhone
>
> On Aug 22, 2010, at 5:50 PM, "Littlefield, Tyler" <tyler@xxxxxxxxxxxxx> wrote:
>
>> it's causing a runtime error when I serialize the password into the player's
>> file.
>> ----- Original Message ----- From: "Dave" <davidct1209@xxxxxxxxx>
>> To: <programmingblind@xxxxxxxxxxxxx>
>> Sent: Sunday, August 22, 2010 6:24 PM
>> Subject: Re: generating sha256 hashes with openssl?
>>
>>
>>> Btw, it might help to let us know what's failing (runtime error,
>>> unexpected values?).
>>>
>>> On 8/22/10, Dave <davidct1209@xxxxxxxxx> wrote:
>>>> Easy way to find out; does std::string have an overloaded equals
>>>> operator and does it perform a copy? You can also try just
>>>> constructing a new std::string for the hash and see if that solves the
>>>> problem.
>>>>
>>>> On 8/22/10, Littlefield, Tyler <tyler@xxxxxxxxxxxxx> wrote:
>>>>> std::string should strcpy though, no?
>>>>> ----- Original Message -----
>>>>> From: "Dave" <davidct1209@xxxxxxxxx>
>>>>> To: <programmingblind@xxxxxxxxxxxxx>
>>>>> Sent: Sunday, August 22, 2010 5:42 PM
>>>>> Subject: Re: generating sha256 hashes with openssl?
>>>>>
>>>>>
>>>>>> From a cursory glance at the function (and without knowing what
>>>>>> exactly failed), it potentially looks like you have a dangling
>>>>>> pointer.
>>>>>>
>>>>>> You assign to your password class member an array of characters which
>>>>>> you created on the heap (and then delete).
>>>>>>
>>>>>> On 8/22/10, Littlefield, Tyler <tyler@xxxxxxxxxxxxx> wrote:
>>>>>>> Hello all,
>>>>>>> I've been trying to figure this out based on documentation from openssl
>>>>>>> (what little there is) and some info from google, but it still seems to
>>>>>>> be
>>>>>>> failing: Any ideas would be great on where I might be going wrong; here
>>>>>>> is
>>>>>>> the function
>>>>>>> void Player::SetPassword(const std::string &s)
>>>>>>> {
>>>>>>> SHA256_CTX context;
>>>>>>> unsigned char *hash = new unsigned char[SHA256_DIGEST_LENGTH+1];
>>>>>>> memset(hash, 0, SHA256_DIGEST_LENGTH+1);
>>>>>>>
>>>>>>> SHA256_Init(&context);
>>>>>>> SHA256_Update(&context, (unsigned char*)s.c_str(), s.length());
>>>>>>> SHA256_Final(hash, &context);
>>>>>>> _password=(char*)hash;
>>>>>>> delete []hash;
>>>>>>> }
>>>>>>> Thanks,
>>>>>>> Ty
>>>>>> __________
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