linux-kernel - Re: [PATCH RESEND v5 6/6] crypto: AF_ALG

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Date:	Mon, 16 May 2016 07:23:48 -0700
From:	Tadeusz Struk <tadeusz.struk@...el.com>
To:	Mat Martineau <mathew.j.martineau@...ux.intel.com>
Cc:	dhowells@...hat.com, herbert@...dor.apana.org.au,
	smueller@...onox.de, linux-api@...r.kernel.org,
	marcel@...tmann.org, linux-kernel@...r.kernel.org,
	keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
	dwmw2@...radead.org, davem@...emloft.net
Subject: Re: [PATCH RESEND v5 6/6] crypto: AF_ALG - add support for key_id

Hi Mat,
On 05/13/2016 04:32 PM, Mat Martineau wrote:
> 
>> +    params.data_len = req->src_len;
>> +    params.enc_len = req->dst_len;

Thanks for info. I have sent an update for this.

> 
> The params member names have changed (now in_len and out_len).
>> +    ret = encrypt_blob(&params, in, out);
> 
> The encrypt function for the key can now be called with params.key->type->asym_eds_op(). This also allows you to factor out the duplication in asym_key_encrypt, asym_key_decrypt, and asym_key_sign. See keyctl_pkey_e_d_s() in keyctl_pkey.c
> 
>> +static int asym_key_verify(const struct key *key, struct akcipher_request *req)
> ...
>> +    ret = verify_signature(key, NULL, &sig);
> 
> key->type->asym_verify_signature() is available as well.

Since these operation will be triggered from userspace I think it's better to use the
official interface as defined in crypto/public_key.h instead of direct calls.
Some operation may not be implemented for a given key type and the official interface
performs necessary checks.
Thanks,
-- 
TS