linux-kernel - Re: [PATCH RFC v4 2/4] crypto: add PKE API

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Date:	Fri, 12 Jun 2015 03:00:42 +0200
From:	Stephan Mueller <smueller@...onox.de>
To:	Tadeusz Struk <tadeusz.struk@...el.com>
Cc:	herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org,
	keescook@...omium.org, jwboyer@...hat.com, richard@....at,
	steved@...hat.com, qat-linux@...el.com, dhowells@...hat.com,
	linux-crypto@...r.kernel.org, james.l.morris@...cle.com,
	jkosina@...e.cz, zohar@...ux.vnet.ibm.com, davem@...emloft.net,
	vgoyal@...hat.com
Subject: Re: [PATCH RFC v4 2/4] crypto: add PKE API

Am Thursday 11 June 2015, 12:05:44 schrieb Tadeusz Struk:

Hi Tadeusz,

>+
>+static int akcipher_clone_key(struct crypto_akcipher *tfm,
>+			      const struct public_key *pkey)
>+{
>+	int i, ret = 0;
>+
>+	tfm->pkey = kzalloc(sizeof(*tfm->pkey), GFP_KERNEL);
>+
>+	if (!tfm->pkey)
>+		return -ENOMEM;
>+
>+	for (i = 0; i < ARRAY_SIZE(tfm->pkey->mpi); i++) {
>+		if (!pkey->mpi[i])
>+			continue;
>+
>+		if (mpi_copy(&tfm->pkey->mpi[i], pkey->mpi[i])) {
>+			akcipher_free_key(tfm->pkey);
>+			tfm->pkey = NULL;
>+			ret = -ENOMEM;
>+			break;
>+		}
>+	}
>+	return ret;
>+}

The testmgr code can mark an entire cipher implementation as fips_allowed=1 as 
already done for RSA. However, unlike with the other ciphers, that flag must 
go in conjunction with the used key sizes.

For FIPS mode, the following restrictions apply:

- RSA: 2048/3072

- DSA: L 2048 / N 224; L 2048 / N 256; L 3072 / N 256

- ECDSA: only the NIST curves

Any other key sizes for the given ciphers is not allowed in FIPS mode.

Should that constraint be considered here?

Ciao
Stephan
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