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author | Nikos Mavrogiannopoulos <nmav@redhat.com> | 2017-04-24 14:16:24 +0200 |
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committer | Nikos Mavrogiannopoulos <nmav@redhat.com> | 2017-04-25 10:02:57 +0200 |
commit | 6abc01095702bccf1b966eb26085d6d6fdfb50be (patch) | |
tree | f70e2ac7d52180fdc6047c76b1a43bb9eb1a68dd | |
parent | e834c67984cd5fd52517eb510e87916145d8dc5c (diff) | |
download | gnutls-6abc01095702bccf1b966eb26085d6d6fdfb50be.tar.gz |
Added explicit check for the bounds of the generated 'd'.
This is according to FIPS186-4 sec. B.3.1.
Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>
-rw-r--r-- | lib/nettle/int/rsa-keygen-fips186.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/nettle/int/rsa-keygen-fips186.c b/lib/nettle/int/rsa-keygen-fips186.c index 9bafc10186..506f758dd1 100644 --- a/lib/nettle/int/rsa-keygen-fips186.c +++ b/lib/nettle/int/rsa-keygen-fips186.c @@ -365,6 +365,12 @@ _rsa_generate_fips186_4_keypair(struct rsa_public_key *pub, goto cleanup; } + /* check whether d > 2^(nlen/2) -- FIPS186-4 5.3.1 */ + if (mpz_sizeinbase(key->d, 2) < n_size/2) { + ret = 0; + goto cleanup; + } + /* Done! Almost, we must compute the auxillary private values. */ /* a = d % (p-1) */ mpz_fdiv_r(key->a, key->d, p1); |