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New helper function to allocate and read a modulus

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When including <test/bignum_helpers.h>, the library/ directory now needs to
be on the include path.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2022-12-07 22:59:54 +01:00
parent 881447d411
commit 195f998107
2 changed files with 37 additions and 0 deletions
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20
tests/include/test/bignum_helpers.h
View File

@ -30,6 +30,7 @@
#if defined(MBEDTLS_BIGNUM_C) #if defined(MBEDTLS_BIGNUM_C)
#include <mbedtls/bignum.h> #include <mbedtls/bignum.h>
#include <bignum_mod.h>
/** Allocate and populate a core MPI from a test case argument. /** Allocate and populate a core MPI from a test case argument.
* *
@ -54,6 +55,25 @@
int mbedtls_test_read_mpi_core( mbedtls_mpi_uint **pX, size_t *plimbs, int mbedtls_test_read_mpi_core( mbedtls_mpi_uint **pX, size_t *plimbs,
const char *input ); const char *input );
/** Read a modulus from a hexadecimal string.
*
* This function allocates exactly as many limbs as necessary to fit
* the length of the input. In other words, it preserves leading zeros.
*
* The limb array is allocated with mbedtls_calloc() and must later be
* freed with mbedtls_free().
*
* \param[in,out] N A modulus structure. It must be initialized, but
* not set up.
* \param[in] s The null-terminated hexadecimal string to read from.
* \param int_rep The desired representation of residues.
*
* \return \c 0 on success, an \c MBEDTLS_ERR_MPI_xxx error code otherwise.
*/
int mbedtls_test_read_mpi_modulus( mbedtls_mpi_mod_modulus *N,
const char *s,
mbedtls_mpi_mod_rep_selector int_rep );
/** Read an MPI from a hexadecimal string. /** Read an MPI from a hexadecimal string.
* *
* Like mbedtls_mpi_read_string(), but with tighter guarantees around * Like mbedtls_mpi_read_string(), but with tighter guarantees around

17
tests/src/bignum_helpers.c
View File

@ -85,6 +85,23 @@ exit:
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA ); return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
} }
int mbedtls_test_read_mpi_modulus( mbedtls_mpi_mod_modulus *N,
const char *s,
mbedtls_mpi_mod_rep_selector int_rep )
{
mbedtls_mpi_uint *p = NULL;
size_t limbs = 0;
if( N->limbs != 0 )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
int ret = mbedtls_test_read_mpi_core( &p, &limbs, s );
if( ret != 0 )
return( ret );
ret = mbedtls_mpi_mod_modulus_setup( N, p, limbs, int_rep );
if( ret != 0 )
mbedtls_free( p );
return( ret );
}
int mbedtls_test_read_mpi( mbedtls_mpi *X, const char *s ) int mbedtls_test_read_mpi( mbedtls_mpi *X, const char *s )
{ {
int negative = 0; int negative = 0;