linux-kernel - Re: [PATCH v1 3/3] crypto: cavium - Register the CNN55XX supported crypto algorithms.

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Date:   Thu, 11 May 2017 18:10:09 +0530
From:   srikanth jampala <jsrikanth@...iumnetworks.com>
To:     Stephan Müller <smueller@...onox.de>
Cc:     Srikanth Jampala <Jampala.Srikanth@...ium.com>,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        George.Cherian@...ium.com, Nidadavolu.Murthy@...ium.com,
        Sreerama.Gadam@...ium.com, Ram.Kumar@...ium.com
Subject: Re: [PATCH v1 3/3] crypto: cavium - Register the CNN55XX supported
 crypto algorithms.

Hi Stephan,

On Thursday 11 May 2017 05:52 PM, Stephan Müller wrote:
> Am Donnerstag, 11. Mai 2017, 14:18:34 CEST schrieb srikanth jampala:
> 
> Hi srikanth,
> 
>> Hi Stephan,
>>
>> On Wednesday 10 May 2017 07:26 PM, Stephan Müller wrote:
>>> Am Mittwoch, 10. Mai 2017, 15:06:40 CEST schrieb Srikanth Jampala:
>>>
>>> Hi Srikanth,
>>>
>>> In general: you are using the ablkcipher API. I think it is on its way out
>>> and being replaced with skcipher.
>>>
>>> Maybe it makes sense to replace it here too. It could be as simple as s/
>>> ablkcipher/skcipher/g
>>
>> Sure, I will do the changes accordingly.
>> As per my understanding, I see the following changes,
>> 1. CRYPTO_ALG_TYPE_ABLKCIPHER changed to CRYPTO_ALG_TYPE_SKCIPHER
>> 2. nitrox_ablkcipher_foo() changed to nitrox_skcipher_foo()
>>
>> Please let me know, any other changes I have to consider?
> 
> What about all crypto_ablkcipher* function calls / structs? Also all 
> ablkcipher_request function calls/structs?

I will work on the changes suggested.
>>
>>>> +static inline int nitrox_ablkcipher_setkey(struct crypto_ablkcipher
>>>> *cipher,
>>>> +                                          int aes_keylen, const u8 *key,
>>>> +                                          unsigned int keylen)
>>>> +{
>>>> +       struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
>>>> +       struct nitrox_crypto_instance *inst = crypto_tfm_ctx(tfm);
>>>> +       struct flexi_crypto_context *fctx;
>>>> +       enum flexi_cipher cipher_type;
>>>> +       const char *name;
>>>> +
>>>> +       name = crypto_tfm_alg_name(tfm);
>>>> +       cipher_type = flexi_cipher_type(name);
>>>> +       if (cipher_type == CIPHER_INVALID) {
>>>> +               pr_err("unsupported cipher: %s\n", name);
>>>> +               return -EINVAL;
>>>> +       }
>>>> +
>>>> +       /* fill crypto context */
>>>> +       fctx = inst->u.fctx;
>>>> +       fctx->flags = 0;
>>>> +       fctx->w0.cipher_type = cipher_type;
>>>> +       fctx->w0.aes_keylen = aes_keylen;
>>>> +       fctx->w0.iv_source = IV_FROM_DPTR;
>>>> +       fctx->flags = cpu_to_be64(*(u64 *)&fctx->w0);
>>>> +       /* copy the key to context */
>>>> +       memcpy(fctx->crypto.u.key, key, keylen);
>>>
>>> Could you help me finding the location where this memory is zeroized upon
>>> release?
>>
>> Currently, we are not zeroized the context in release.
>> We are doing it at the time of allocation.
> 
> You store a key in a piece of heap memory. I guess you want to zeroize that 
> key memory before releasing?
> 
I will do the changes.
> 
> Ciao
> Stephan
>