linux-kernel - Re: [PATCH v2 2/2] integrity: convert digsig to akcipher api

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Date:	Mon, 14 Dec 2015 08:24:47 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Tadeusz Struk <tadeusz.struk@...el.com>
Cc:	herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org,
	dhowells@...hat.com, linux-security-module@...r.kernel.org,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH v2 2/2] integrity: convert digsig to akcipher api

On Sat, 2015-12-12 at 18:26 -0800, Tadeusz Struk wrote:
> Convert asymmetric_verify to akcipher api.
> 
> Signed-off-by: Tadeusz Struk <tadeusz.struk@...el.com>
> ---
>  security/integrity/Kconfig             |    1 +
>  security/integrity/digsig_asymmetric.c |   10 +++-------
>  2 files changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
> index 73c457b..f0b2463 100644
> --- a/security/integrity/Kconfig
> +++ b/security/integrity/Kconfig
> @@ -36,6 +36,7 @@ config INTEGRITY_ASYMMETRIC_KEYS
>          select ASYMMETRIC_KEY_TYPE
>          select ASYMMETRIC_PUBLIC_KEY_SUBTYPE
>          select PUBLIC_KEY_ALGO_RSA
> +        select CRYPTO_RSA
>          select X509_CERTIFICATE_PARSER
>  	help
>  	  This option enables digital signature verification using
> diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c
> index 4fec181..5629372 100644
> --- a/security/integrity/digsig_asymmetric.c
> +++ b/security/integrity/digsig_asymmetric.c
> @@ -92,13 +92,9 @@ int asymmetric_verify(struct key *keyring, const char *sig,
>  	pks.pkey_hash_algo = hdr->hash_algo;
>  	pks.digest = (u8 *)data;
>  	pks.digest_size = datalen;
> -	pks.nr_mpi = 1;
> -	pks.rsa.s = mpi_read_raw_data(hdr->sig, siglen);
> -
> -	if (pks.rsa.s)
> -		ret = verify_signature(key, &pks);
> -
> -	mpi_free(pks.rsa.s);
> +	pks.s = hdr->sig;

Thanks!  With this change, my system is now able to boot.

Mimi 

> +	pks.s_size = siglen;
> +	ret = verify_signature(key, &pks);
>  	key_put(key);
>  	pr_debug("%s() = %d\n", __func__, ret);
>  	return ret;

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