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* rsa.c (generate): Use e=65537 for new RSA keys.

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This commit is contained in:
David Shaw 2006-06-28 22:29:25 +00:00
parent d91c7a06ff
commit 04376627a6
2 changed files with 13 additions and 13 deletions
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4
cipher/ChangeLog
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@ -1,3 +1,7 @@
2006-06-28 David Shaw <dshaw@jabberwocky.com>
* rsa.c (generate): Use e=65537 for new RSA keys.
2006-04-20 David Shaw <dshaw@jabberwocky.com>
* dsa.c (dsa2_generate): New function to generate a DSA key with a

22
cipher/rsa.c
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@ -136,25 +136,21 @@ generate( RSA_secret_key *sk, unsigned nbits )
mpi_gcd(g, t1, t2);
mpi_fdiv_q(f, phi, g);
/* find an public exponent.
We use 41 as this is quite fast and more secure than the
commonly used 17. Benchmarking the RSA verify function
with a 1024 bit key yields (2001-11-08):
/* Find an public exponent.
Benchmarking the RSA verify function with a 1024 bit key yields
(2001-11-08):
e=17 0.54 ms
e=41 0.75 ms
e=257 0.95 ms
e=65537 1.80 ms
This code used 41 until 2006-06-28 when it was changed to use
65537 as the new best practice. See FIPS-186-3.
*/
e = mpi_alloc( (32+BITS_PER_MPI_LIMB-1)/BITS_PER_MPI_LIMB );
mpi_set_ui( e, 41);
if( !mpi_gcd(t1, e, phi) ) {
mpi_set_ui( e, 257);
if( !mpi_gcd(t1, e, phi) ) {
mpi_set_ui( e, 65537);
while( !mpi_gcd(t1, e, phi) ) /* (while gcd is not 1) */
mpi_add_ui( e, e, 2);
}
}
mpi_set_ui( e, 65537);
while( !mpi_gcd(t1, e, phi) ) /* (while gcd is not 1) */
mpi_add_ui( e, e, 2);
/* calculate the secret key d = e^1 mod phi */
d = mpi_alloc( (nbits+BITS_PER_MPI_LIMB-1)/BITS_PER_MPI_LIMB );