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- Added mpi_fill_random() for centralized filling of big numbers with random data (Fixed ticket #10)

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This commit is contained in:
Paul Bakker 2011-03-26 13:18:49 +00:00
parent 98675496e1
commit 287781a965
4 changed files with 35 additions and 23 deletions
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12
library/dhm.c
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@ -138,12 +138,8 @@ int dhm_make_params( dhm_context *ctx, int x_size,
* Generate X as large as possible ( < P )
*/
n = x_size / sizeof( t_int ) + 1;
MPI_CHK( mpi_grow( &ctx->X, n ) );
MPI_CHK( mpi_lset( &ctx->X, 0 ) );
p = (unsigned char *) ctx->X.p;
for( i = 0; i < x_size; i++ )
*p++ = (unsigned char) f_rng( p_rng );
mpi_fill_random( &ctx->X, n, f_rng, p_rng );
while( mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 )
mpi_shift_r( &ctx->X, 1 );
@ -220,12 +216,8 @@ int dhm_make_public( dhm_context *ctx, int x_size,
* generate X and calculate GX = G^X mod P
*/
n = x_size / sizeof( t_int ) + 1;
MPI_CHK( mpi_grow( &ctx->X, n ) );
MPI_CHK( mpi_lset( &ctx->X, 0 ) );
p = (unsigned char *) ctx->X.p;
for( i = 0; i < x_size; i++ )
*p++ = (unsigned char) f_rng( p_rng );
mpi_fill_random( &ctx->X, n, f_rng, p_rng );
while( mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 )
mpi_shift_r( &ctx->X, 1 );