diff options
Diffstat (limited to 'lib/nettle/int/rsa-keygen-fips186.c')
| -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); |