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Add guards around code that is specific to dynamically-loaded groups

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For some curves (semi-coincidentally, short Weierstrass curves), the
ECP module calculates some group parameters dynamically. Build the
code to calculate the parameters only if a relevant curve is enabled.
This fixes an unused function warning when building with only
Montgomery curves.

Signed-off-by: Gilles Peskine <gilles.peskine@arm.com>
This commit is contained in:
Gilles Peskine 2018-09-12 14:44:03 +02:00
parent e8c04fed51
commit aa9493a411
1 changed files with 19 additions and 0 deletions
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19
library/ecp_curves.c
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@ -553,6 +553,22 @@ static const mbedtls_mpi_uint brainpoolP512r1_n[] = {
}; };
#endif /* MBEDTLS_ECP_DP_BP512R1_ENABLED */ #endif /* MBEDTLS_ECP_DP_BP512R1_ENABLED */
#if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_BP256R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_BP384R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_BP512R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
/* For these curves, we build the group parameters dynamically. */
#define ECP_LOAD_GROUP
#endif
#if defined(ECP_LOAD_GROUP)
/* /*
* Create an MPI from embedded constants * Create an MPI from embedded constants
* (assumes len is an exact multiple of sizeof mbedtls_mpi_uint) * (assumes len is an exact multiple of sizeof mbedtls_mpi_uint)
@ -603,6 +619,7 @@ static int ecp_group_load( mbedtls_ecp_group *grp,
return( 0 ); return( 0 );
} }
#endif /* ECP_LOAD_GROUP */
#if defined(MBEDTLS_ECP_NIST_OPTIM) #if defined(MBEDTLS_ECP_NIST_OPTIM)
/* Forward declarations */ /* Forward declarations */
@ -644,6 +661,7 @@ static int ecp_mod_p224k1( mbedtls_mpi * );
static int ecp_mod_p256k1( mbedtls_mpi * ); static int ecp_mod_p256k1( mbedtls_mpi * );
#endif #endif
#if defined(ECP_LOAD_GROUP)
#define LOAD_GROUP_A( G ) ecp_group_load( grp, \ #define LOAD_GROUP_A( G ) ecp_group_load( grp, \
G ## _p, sizeof( G ## _p ), \ G ## _p, sizeof( G ## _p ), \
G ## _a, sizeof( G ## _a ), \ G ## _a, sizeof( G ## _a ), \
@ -659,6 +677,7 @@ static int ecp_mod_p256k1( mbedtls_mpi * );
G ## _gx, sizeof( G ## _gx ), \ G ## _gx, sizeof( G ## _gx ), \
G ## _gy, sizeof( G ## _gy ), \ G ## _gy, sizeof( G ## _gy ), \
G ## _n, sizeof( G ## _n ) ) G ## _n, sizeof( G ## _n ) )
#endif /* ECP_LOAD_GROUP */
#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
/* /*