commit 786848b5c56cdebc046c72703e0110200849d918
author Tom Cosgrove <tom.cosgrove@arm.com> Tue Dec 13 10:45:19 2022 +0000
committer Tom Cosgrove <tom.cosgrove@arm.com> Thu Dec 15 16:56:36 2022 +0000
tree 7f178a03c522d75b01e8615ad449faeb01092a0c
parent 28ff92cc3a72d98885e4fa6dc19e9725db5f9ac7

Add low-level Montgomery conversion functions to bignum_core

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>

library/bignum_mod_raw.c

diff --git a/library/bignum_mod_raw.c b/library/bignum_mod_raw.c
index be8fc86..d2d93d3 100644
--- a/library/bignum_mod_raw.c
+++ b/library/bignum_mod_raw.c
@@ -188,8 +188,8 @@
     if( ( T = (mbedtls_mpi_uint *) mbedtls_calloc( t_limbs, ciL ) ) == NULL )
         return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
 
-    mbedtls_mpi_core_montmul( X, X, m->rep.mont.rr, m->limbs, m->p, m->limbs,
-                              m->rep.mont.mm, T );
+    mbedtls_mpi_core_to_mont_rep( X, X, m->p, m->limbs,
+                                  m->rep.mont.mm, m->rep.mont.rr, T );
 
     mbedtls_platform_zeroize( T, t_limbs * ciL );
     mbedtls_free( T );
@@ -199,15 +199,13 @@
 int mbedtls_mpi_mod_raw_from_mont_rep( mbedtls_mpi_uint *X,
                                        const mbedtls_mpi_mod_modulus *m )
 {
-    const mbedtls_mpi_uint one = 1;
     const size_t t_limbs = mbedtls_mpi_core_montmul_working_limbs( m->limbs );
     mbedtls_mpi_uint *T;
 
     if( ( T = (mbedtls_mpi_uint *) mbedtls_calloc( t_limbs, ciL ) ) == NULL )
         return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
 
-    mbedtls_mpi_core_montmul( X, X, &one, 1, m->p, m->limbs,
-                              m->rep.mont.mm, T );
+    mbedtls_mpi_core_from_mont_rep( X, X, m->p, m->limbs, m->rep.mont.mm, T );
 
     mbedtls_platform_zeroize( T, t_limbs * ciL );
     mbedtls_free( T );