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Add fallback for md_alg == NONE to ecdsa_sign_det()

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Manuel Pégourié-Gonnard 2014-01-07 16:17:53 +01:00
parent 937340bce0
commit 5e6edcfd96
1 changed files with 33 additions and 1 deletions
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34
library/ecdsa.c
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@ -131,6 +131,32 @@ static void hmac_drbg_free( hmac_drbg_context *ctx )
memset( ctx, 0, sizeof( hmac_drbg_context ) );
}
/*
* This a hopefully temporary compatibility function.
*
* Since we can't ensure the caller will pass a valid md_alg before the next
* interface change, try to pick up a decent md by size.
*
* Argument is the minimum size in bytes of the MD output.
*/
const md_info_t *md_info_by_size( int min_size )
{
const md_info_t *md_cur, *md_picked = NULL;
const int *md_alg;
for( md_alg = md_list(); *md_alg != 0; md_alg++ )
{
if( ( md_cur = md_info_from_type( *md_alg ) ) == NULL ||
md_cur->size < min_size ||
( md_picked != NULL && md_cur->size > md_picked->size ) )
continue;
md_picked = md_cur;
}
return( md_picked );
}
#endif
/*
@ -242,7 +268,13 @@ int ecdsa_sign_det( ecp_group *grp, mpi *r, mpi *s,
const md_info_t *md_info;
mpi h;
if( ( md_info = md_info_from_type( md_alg ) ) == NULL )
/* Temporary fallback */
if( md_alg == POLARSSL_MD_NONE )
md_info = md_info_by_size( blen );
else
md_info = md_info_from_type( md_alg );
if( md_info == NULL )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
mpi_init( &h );