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New test helper mbedtls_test_read_mpi

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This test helper reads an MPI from a string and guarantees control over the
number of limbs of the MPI, allowing test cases to construct values with or
without leading zeros, including 0 with 0 limbs.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-06-11 14:13:53 +02:00
parent 5fb6f700ba
commit ebc49e5bff
2 changed files with 40 additions and 0 deletions
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15
tests/src/helpers.c
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@@ -259,3 +259,18 @@ void mbedtls_test_err_add_check( int high, int low,
}
}
#endif /* MBEDTLS_TEST_HOOKS */
#if defined(MBEDTLS_BIGNUM_C)
int mbedtls_test_read_mpi( mbedtls_mpi *X, int radix, const char *s )
{
/* mbedtls_mpi_read_string() currently retains leading zeros.
* It always allocates at least one limb for the value 0. */
if( s[0] == 0 )
{
mbedtls_mpi_free( X );
return( 0 );
}
else
return( mbedtls_mpi_read_string( X, radix, s ) );
}
#endif