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DHM: blind call to mpi_inv_mod() on secret value

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2020-06-25 12:47:22 +02:00
parent f0f43c51c4
commit a35e98a060
1 changed files with 15 additions and 2 deletions
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17
library/dhm.c
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@ -371,6 +371,9 @@ static int dhm_update_blinding( mbedtls_dhm_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{ {
int ret; int ret;
mbedtls_mpi R;
mbedtls_mpi_init( &R );
/* /*
* Don't use any blinding the first time a particular X is used, * Don't use any blinding the first time a particular X is used,
@ -407,11 +410,21 @@ static int dhm_update_blinding( mbedtls_dhm_context *ctx,
/* Vi = random( 2, P-1 ) */ /* Vi = random( 2, P-1 ) */
MBEDTLS_MPI_CHK( dhm_random_below( &ctx->Vi, &ctx->P, f_rng, p_rng ) ); MBEDTLS_MPI_CHK( dhm_random_below( &ctx->Vi, &ctx->P, f_rng, p_rng ) );
/* Vf = Vi^-X mod P */ /* Vf = Vi^-X mod P
MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->Vf, &ctx->Vi, &ctx->P ) ); * First compute Vi^-1 = R * (R Vi)^-1, (avoiding leaks from inv_mod),
* then elevate to the Xth power. */
MBEDTLS_MPI_CHK( dhm_random_below( &R, &ctx->P, f_rng, p_rng ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vf, &ctx->Vi, &R ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vf, &ctx->Vf, &ctx->P ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->Vf, &ctx->Vf, &ctx->P ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vf, &ctx->Vf, &R ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vf, &ctx->Vf, &ctx->P ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->Vf, &ctx->Vf, &ctx->X, &ctx->P, &ctx->RP ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->Vf, &ctx->Vf, &ctx->X, &ctx->P, &ctx->RP ) );
cleanup: cleanup:
mbedtls_mpi_free( &R );
return( ret ); return( ret );
} }