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Add ecp_gen_keypair()

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This commit is contained in:
Manuel Pégourié-Gonnard
2013-01-26 14:42:45 +01:00
parent cf4365f560
commit 45a035a9ac
4 changed files with 73 additions and 0 deletions
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27
library/ecp.c
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@ -1127,6 +1127,33 @@ cleanup:
return( ret );
}
/*
* Generate a keypair (SEC1 3.2.1)
*/
int ecp_gen_keypair( const ecp_group *grp, mpi *d, ecp_point *Q,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int count = 0;
size_t n_size = (grp->nbits + 7) / 8;
/*
* Generate d such that 1 <= n < N
*/
do
{
mpi_fill_random( d, n_size, f_rng, p_rng );
while( mpi_cmp_mpi( d, &grp->N ) >= 0 )
mpi_shift_r( d, 1 );
if( count++ > 10 )
return( POLARSSL_ERR_ECP_GENERIC );
}
while( mpi_cmp_int( d, 1 ) < 0 );
return( ecp_mul( grp, Q, d, &grp->G ) );
}
#if defined(POLARSSL_SELF_TEST)