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Add ecdh_make_server_params (untested yet)

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-02-10 15:01:54 +01:00
parent 63533e44c2
commit 13724765b2
2 changed files with 60 additions and 6 deletions
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36
library/ecdh.c
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@ -85,9 +85,9 @@ void ecdh_init( ecdh_context *ctx )
ecp_point_init( &ctx->Q );
ecp_point_init( &ctx->Qp );
mpi_init ( &ctx->z );
ctx->point_format = POLARSSL_ECP_PF_UNCOMPRESSED;
}
/*
* Free context
*/
@ -103,6 +103,40 @@ void ecdh_free( ecdh_context *ctx )
mpi_free ( &ctx->z );
}
/*
* Setup and write the ServerKeyExhange parameters
* struct {
* ECParameters curve_params;
* ECPoint public;
* } ServerECDHParams;
*/
int ecdh_make_server_params( ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
size_t grp_len, pt_len;
if( ( ret = ecdh_gen_public( &ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng ) )
!= 0 )
return( ret );
if( ( ret = ecp_tls_write_group( &ctx->grp, &grp_len, buf, blen ) )
!= 0 )
return( ret );
buf += grp_len;
blen -= grp_len;
if( ( ret = ecp_tls_write_point( &ctx->grp, &ctx->Q, ctx->point_format,
&pt_len, buf, blen ) ) != 0 )
return( ret );
*olen = grp_len + pt_len;
return 0;
}
#if defined(POLARSSL_SELF_TEST)