On Fri, Apr 8, 2016 at 12:55 PM, Stephan Mueller <smueller@xxxxxxxxxx> wrote:
> Am Freitag, 8. April 2016, 12:54:10 schrieb Jeffrey Walton:
>
> Hi Jeffrey,
>
>> > +int rsa_check_key_length(unsigned int len)
>> > +{
>> > + switch (len) {
>> > + case 512:
>> > + case 1024:
>> > + case 1536:
>> > + case 2048:
>> > + case 3072:
>> > + case 4096:
>> > + return 0;
>> > + }
>> > +
>> > + return -EINVAL;
>> > +}
>>
>> That's an unusual restriction.
>>
>> > + key->n_sz = vlen;
>> > + /* In FIPS mode only allow key size 2K & 3K */
>> > + if (fips_enabled && (key->n_sz != 256 && key->n_sz != 384)) {
>> > + dev_err(ctx->dev, "RSA: key size not allowed in FIPS
>> > mode\n"); + goto err;
>> > + }
>>
>> That's an unusual restriction, too. As far as I know, FIPS does not
>> place that restriction.
>
> It does, see SP80-131A and the requirements on CAVS.
I believe the controlling document is SP800-56B. SP800-131 is just a
guide, and it digests the information from SP800-56B. For current FIPS
140 requirements (SP800-56B), RSA is a Finite Filed (FF) system, and
the requirement is |N| >= 2048.
Also, I did not see the restriction listed in SP800-131A Rev 1. Cf.,
http://csrc.nist.gov/publications/drafts/800-131A/sp800-131a_r1_draft.pdf.
Jeff
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