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mbedtls_ecp_muladd is only for short Weierstrass curves

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Document that mbedtls_ecp_muladd and mbedtls_ecp_muladd_restartable
are only implemented on short Weierstrass curves.

Exclude these functions at build time if no short Weierstrass curve
is included in the build. Before, these functions failed to compile in
such a configuration.

Signed-off-by: Gilles Peskine <gilles.peskine@arm.com>
This commit is contained in:
Gilles Peskine 2018-09-14 18:32:19 +02:00
parent 799e57612a
commit 9b99a8942f
2 changed files with 36 additions and 0 deletions
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2
library/ecp.c
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@ -2781,6 +2781,7 @@ cleanup:
}
#endif /* ECP_SHORTWEIERSTRASS */
#if defined(MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED)
/*
* R = m * P with shortcuts for m == 1 and m == -1
* NOT constant-time - ONLY for short Weierstrass!
@ -2926,6 +2927,7 @@ int mbedtls_ecp_muladd( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
ECP_VALIDATE_RET( Q != NULL );
return( mbedtls_ecp_muladd_restartable( grp, R, m, P, n, Q, NULL ) );
}
#endif /* MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED */
#if defined(ECP_MONTGOMERY)
/*