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Add clarifying comment about the backport

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This commit is contained in:
Janos Follath 2019-01-21 10:56:23 +00:00
parent a62744d487
commit 4bf65fb71f
1 changed files with 5 additions and 1 deletions
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6
library/ecdsa.c
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@ -126,6 +126,11 @@ static int ecdsa_sign_internal( mbedtls_ecp_group *grp, mbedtls_mpi *r,
/* /*
* Generate a random value to blind inv_mod in next step, * Generate a random value to blind inv_mod in next step,
* avoiding a potential timing leak. * avoiding a potential timing leak.
*
* This loop does the same job as mbedtls_ecp_gen_privkey() and it is
* replaced by a call to it in the mainline. This change is not
* necessary to backport the fix separating the blinding and ephemeral
* key generating RNGs, therefore the original code is kept.
*/ */
blind_tries = 0; blind_tries = 0;
do do
@ -135,7 +140,6 @@ static int ecdsa_sign_internal( mbedtls_ecp_group *grp, mbedtls_mpi *r,
p_rng_blind ) ); p_rng_blind ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &t, 8 * n_size - grp->nbits ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &t, 8 * n_size - grp->nbits ) );
/* See mbedtls_ecp_gen_keypair() */
if( ++blind_tries > 30 ) if( ++blind_tries > 30 )
return( MBEDTLS_ERR_ECP_RANDOM_FAILED ); return( MBEDTLS_ERR_ECP_RANDOM_FAILED );
} }