Add ecdh_{make,read}_public()

parent 854fbd7b
......@@ -122,6 +122,33 @@ int ecdh_make_params( ecdh_context *ctx, size_t *olen,
int ecdh_read_params( ecdh_context *ctx,
const unsigned char **buf, const unsigned char *end );
/**
* \brief Setup and export the client's public value
*
* \param ctx ECDH context
* \param olen number of bytes actually written
* \param buf destination buffer
* \param blen size of destination buffer
*
* \return 0 if successful, or an POLARSSL_ERR_ECP_XXX error code
*/
int ecdh_make_public( ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Parse and import the client's public value
*
* \param ctx ECDH context
* \param buf start of input buffer
* \param blen length of input buffer
*
* \return 0 if successful, or an POLARSSL_ERR_ECP_XXX error code
*/
int ecdh_read_public( ecdh_context *ctx,
const unsigned char *buf, size_t blen );
/**
* \brief Checkup routine
*
......
......@@ -159,6 +159,33 @@ int ecdh_read_params( ecdh_context *ctx,
return 0;
}
/*
* Setup and export the client public value
*/
int ecdh_make_public( 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;
if( ( ret = ecdh_gen_public( &ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng ) )
!= 0 )
return( ret );
return ecp_tls_write_point( &ctx->grp, &ctx->Q, ctx->point_format,
olen, buf, blen );
}
/*
* Parse and import the client's public value
*/
int ecdh_read_public( ecdh_context *ctx,
const unsigned char *buf, size_t blen )
{
return ecp_tls_read_point( &ctx->grp, &ctx->Qp, &buf, blen );
}
#if defined(POLARSSL_SELF_TEST)
/*
......
......@@ -99,6 +99,11 @@ ecdh_exchange:id
&rnd_pseudo_rand, &rnd_info ) == 0 );
TEST_ASSERT( ecdh_read_params( &cli, &vbuf, buf + len ) == 0 );
memset( buf, 0x00, sizeof( buf ) ); vbuf = buf;
TEST_ASSERT( ecdh_make_public( &cli, &len, buf, 1000,
&rnd_pseudo_rand, &rnd_info ) == 0 );
TEST_ASSERT( ecdh_read_public( &srv, buf, len ) == 0 );
ecdh_free( &srv );
ecdh_free( &cli );
}
......
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