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- Added POLARSSL_MPI_WINDOW_SIZE definition to allow easier time to memory trade-off

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This commit is contained in:
Paul Bakker 2011-11-25 11:52:11 +00:00
parent 2e6d5328d5
commit b6d5f08051
3 changed files with 17 additions and 1 deletions
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5
library/bignum.c
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@ -1377,7 +1377,7 @@ int mpi_exp_mod( mpi *X, const mpi *A, const mpi *E, const mpi *N, mpi *_RR )
size_t i, j, nblimbs;
size_t bufsize, nbits;
t_uint ei, mm, state;
mpi RR, T, W[64];
mpi RR, T, W[ 2 << POLARSSL_MPI_WINDOW_SIZE ];
if( mpi_cmp_int( N, 0 ) < 0 || ( N->p[0] & 1 ) == 0 )
return( POLARSSL_ERR_MPI_BAD_INPUT_DATA );
@ -1394,6 +1394,9 @@ int mpi_exp_mod( mpi *X, const mpi *A, const mpi *E, const mpi *N, mpi *_RR )
wsize = ( i > 671 ) ? 6 : ( i > 239 ) ? 5 :
( i > 79 ) ? 4 : ( i > 23 ) ? 3 : 1;
if( wsize > POLARSSL_MPI_WINDOW_SIZE )
wsize = POLARSSL_MPI_WINDOW_SIZE;
j = N->n + 1;
MPI_CHK( mpi_grow( X, j ) );
MPI_CHK( mpi_grow( &W[1], j ) );