commit ec440f2397a8e4326457abb315b2d33496948cf2
author Hanno Becker <hanno.becker@arm.com> Thu Aug 11 17:29:32 2022 +0100
committer Minos Galanakis <minos.galanakis@arm.com> Tue Oct 25 15:08:08 2022 +0100
tree 60964339b61e7d244ea5a2f498c3f14f3e1da28a
parent 383b0bbea08aefdc81833a11a5425fe4e2eba130

bignum_mod_raw: Ported mbedtls_mpi_get_montgomery_constant_unsafe from prototype

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>

library/bignum_core.c

diff --git a/library/bignum_core.c b/library/bignum_core.c
index 0083729..457405d 100644
--- a/library/bignum_core.c
+++ b/library/bignum_core.c
@@ -511,4 +511,20 @@
     mbedtls_ct_mpi_uint_cond_assign( AN_limbs, X, T, (unsigned char) ( carry ^ borrow ) );
 }
 
+int mbedtls_mpi_get_montgomery_constant_unsafe( mbedtls_mpi *X,
+                                                mbedtls_mpi const *N )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    if ( X == NULL || N == NULL ) goto cleanup;
+
+    MBEDTLS_MPI_CHK( mbedtls_mpi_lset( X, 1 ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_shift_l( X, N->n * 2 * biL ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( X, X, N ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_shrink( X, N->n ) );
+
+cleanup:
+    return( ret );
+}
+
 #endif /* MBEDTLS_BIGNUM_C */