linux-kernel - Re: [PATCH] crypto: rsa - allow only odd e and restrict value in FIPS mode

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Message-ID: <ZJVWO1ndSs0bupBC@gondor.apana.org.au>
Date:   Fri, 23 Jun 2023 16:22:19 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Mahmoud Adam <mngyadam@...zon.com>
Cc:     davem@...emloft.net, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: rsa - allow only odd e and restrict value in
 FIPS mode

On Tue, Jun 13, 2023 at 04:17:31PM +0000, Mahmoud Adam wrote:
> check if rsa public exponent is odd and check its value is between
> 2^16 < e < 2^256.
> 
> FIPS 186-5 DSS (page 35)[1] specify that:
> 1. The public exponent e shall be selected with the following constraints:
>   (a) The public verification exponent e shall be selected prior to
>   generating the primes, p and q, and the private signature exponent
>   d.
>   (b) The exponent e shall be an odd positive integer such that:
>    2^16 < e < 2^256.
> 
> [1] https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-5.pdf
> 
> Signed-off-by: Mahmoud Adam <mngyadam@...zon.com>
> ---
>  crypto/rsa.c | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt