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Merge remote-tracking branch 'hanno/sliding_exponentiation' into development

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* hanno/sliding_exponentiation:
  Adapt ChangeLog
  Abort modular inversion when modulus is one.
  Correct sign in modular exponentiation algorithm.
This commit is contained in:
Manuel Pégourié-Gonnard
2017-06-08 19:46:30 +02:00
parent e778441312 072e806a07
commit 1178ac5e77
4 changed files with 12 additions and 5 deletions
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4
library/bignum.c
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@ -1790,7 +1790,7 @@ int mbedtls_mpi_exp_mod( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi
*/
MBEDTLS_MPI_CHK( mpi_montred( X, N, mm, &T ) );
if( neg )
if( neg && E->n != 0 && ( E->p[0] & 1 ) != 0 )
{
X->s = -1;
MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( X, N, X ) );
@ -1893,7 +1893,7 @@ int mbedtls_mpi_inv_mod( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi
int ret;
mbedtls_mpi G, TA, TU, U1, U2, TB, TV, V1, V2;
if( mbedtls_mpi_cmp_int( N, 0 ) <= 0 )
if( mbedtls_mpi_cmp_int( N, 1 ) <= 0 )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
mbedtls_mpi_init( &TA ); mbedtls_mpi_init( &TU ); mbedtls_mpi_init( &U1 ); mbedtls_mpi_init( &U2 );