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Avoid re-checking argument on restart

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Manuel Pégourié-Gonnard 2017-04-20 11:29:43 +02:00
parent 3a256128d6
commit a08cd1a77f
1 changed files with 13 additions and 3 deletions
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16
library/ecp.c
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@ -2115,9 +2115,19 @@ int mbedtls_ecp_mul_restartable( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
#endif /* MBEDTLS_ECP_INTERNAL_ALT */ #endif /* MBEDTLS_ECP_INTERNAL_ALT */
/* Common sanity checks */ #if defined(MBEDTLS_ECP_EARLY_RETURN) && defined(ECP_SHORTWEIERSTRASS)
MBEDTLS_MPI_CHK( mbedtls_ecp_check_privkey( grp, m ) ); /* skip argument check when restarting */
MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, P ) ); if( ecp_get_type( grp ) != ECP_TYPE_SHORT_WEIERSTRASS ||
rs_ctx == NULL || rs_ctx->rsm == NULL )
#endif
{
/* Common sanity checks */
MBEDTLS_MPI_CHK( mbedtls_ecp_check_privkey( grp, m ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, P ) );
/* check_privkey is 0M and check_pubkey is 3M */
ECP_BUDGET( 3 );
}
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA; ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
#if defined(ECP_MONTGOMERY) #if defined(ECP_MONTGOMERY)