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Add ecp_supported_curves and simplify some code

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This commit is contained in:
Manuel Pégourié-Gonnard
2013-09-16 17:30:04 +02:00
committed by Paul Bakker
parent 7038039f2e
commit 568c9cf878
5 changed files with 95 additions and 113 deletions
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92
library/ecp.c
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@ -67,6 +67,32 @@
unsigned long add_count, dbl_count;
#endif
/*
* List of supported curves:
* - internal ID
* - TLS NamedCurve number (RFC 4492 section 5.1.1)
* - size in bits
*/
ecp_curve_info ecp_supported_curves[] =
{
#if defined(POLARSSL_ECP_DP_SECP521R1_ENABLED)
{ POLARSSL_ECP_DP_SECP521R1, 25, 521, },
#endif
#if defined(POLARSSL_ECP_DP_SECP384R1_ENABLED)
{ POLARSSL_ECP_DP_SECP384R1, 24, 384, },
#endif
#if defined(POLARSSL_ECP_DP_SECP256R1_ENABLED)
{ POLARSSL_ECP_DP_SECP256R1, 23, 256, },
#endif
#if defined(POLARSSL_ECP_DP_SECP224R1_ENABLED)
{ POLARSSL_ECP_DP_SECP224R1, 21, 224, },
#endif
#if defined(POLARSSL_ECP_DP_SECP192R1_ENABLED)
{ POLARSSL_ECP_DP_SECP192R1, 19, 192, },
#endif
{ POLARSSL_ECP_DP_NONE, 0, 0 },
};
/*
* Initialize (the components of) a point
*/
@ -720,54 +746,42 @@ int ecp_tls_write_group( const ecp_group *grp, size_t *olen,
return 0;
}
/* Hard-coded values are temporary, will be reimplemented soon */
ecp_group_id ecp_grp_id_from_named_curve( unsigned int curve )
/*
* Get the internal identifer from the TLS name
*/
ecp_group_id ecp_grp_id_from_named_curve( uint16_t name )
{
switch( curve )
ecp_curve_info *curve_info;
for( curve_info = ecp_supported_curves;
curve_info->grp_id != POLARSSL_ECP_DP_NONE;
curve_info++ )
{
case 19:
return( POLARSSL_ECP_DP_SECP192R1 );
case 21:
return( POLARSSL_ECP_DP_SECP224R1 );
case 23:
return( POLARSSL_ECP_DP_SECP256R1 );
case 24:
return( POLARSSL_ECP_DP_SECP384R1 );
case 25:
return( POLARSSL_ECP_DP_SECP521R1 );
default:
return( POLARSSL_ECP_DP_NONE );
if( curve_info->name == name )
return( curve_info->grp_id );
}
return( POLARSSL_ECP_DP_NONE );
}
unsigned int ecp_named_curve_from_grp_id( ecp_group_id id )
/*
* Get the TLS name for the internal identifer
*/
uint16_t ecp_named_curve_from_grp_id( ecp_group_id id )
{
switch( id )
ecp_curve_info *curve_info;
for( curve_info = ecp_supported_curves;
curve_info->grp_id != POLARSSL_ECP_DP_NONE;
curve_info++ )
{
case POLARSSL_ECP_DP_SECP192R1:
return( 19 );
case POLARSSL_ECP_DP_SECP224R1:
return( 21 );
case POLARSSL_ECP_DP_SECP256R1:
return( 23 );
case POLARSSL_ECP_DP_SECP384R1:
return( 24 );
case POLARSSL_ECP_DP_SECP521R1:
return( 25 );
default:
return( 0 );
if( curve_info->grp_id == id )
return( curve_info->name );
}
return( 0 );
}
/*
* Fast mod-p functions expect their argument to be in the 0..p^2 range.
*