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ECDH: Clean up the interface to Everest code

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This commit is contained in:
Christoph M. Wintersteiger 2018-12-12 17:26:41 +00:00 committed by Janos Follath
parent 48d26c21c6
commit 4936beb513
5 changed files with 88 additions and 76 deletions
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38
3rdparty/everest/include/everest/everest.h vendored Normal file → Executable file
View file

@ -22,17 +22,23 @@
#ifndef MBEDTLS_EVEREST_H
#define MBEDTLS_EVEREST_H
#include "everest/x25519.h"
#ifdef __cplusplus
extern "C" {
#endif
struct mbedtls_ecdh_context;
typedef struct mbedtls_ecdh_context mbedtls_ecdh_context;
struct mbedtls_x25519_context_;
/**
* Defines the source of the imported EC key.
*/
typedef enum
{
MBEDTLS_EVEREST_ECDH_OURS, /**< Our key. */
MBEDTLS_EVEREST_ECDH_THEIRS, /**< The key of the peer. */
} mbedtls_everest_ecdh_side;
typedef struct {
struct mbedtls_x25519_context_ *ctx;
mbedtls_x25519_context ctx;
} mbedtls_ecdh_context_everest;
@ -48,18 +54,18 @@ typedef struct {
* ciphersuites.
*
* \param ctx The ECDH context to set up.
* \param grp The group id of the group to set up the context for.
* \param grp_id The group id of the group to set up the context for.
*
* \return \c 0 on success.
*/
int mbedtls_everest_setup( mbedtls_ecdh_context *ctx, int grp );
int mbedtls_everest_setup( mbedtls_ecdh_context_everest *ctx, int grp_id );
/**
* \brief This function frees a context.
*
* \param ctx The context to free.
*/
void mbedtls_everest_free( mbedtls_ecdh_context *ctx );
void mbedtls_everest_free( mbedtls_ecdh_context_everest *ctx );
/**
* \brief This function generates a public key and a TLS
@ -84,7 +90,7 @@ void mbedtls_everest_free( mbedtls_ecdh_context *ctx );
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*/
int mbedtls_everest_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
int mbedtls_everest_make_params( mbedtls_ecdh_context_everest *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int( *f_rng )( void *, unsigned char *, size_t ),
void *p_rng );
@ -106,7 +112,7 @@ int mbedtls_everest_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
* \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*
*/
int mbedtls_everest_read_params( mbedtls_ecdh_context *ctx,
int mbedtls_everest_read_params( mbedtls_ecdh_context_everest *ctx,
const unsigned char **buf, const unsigned char *end );
/**
@ -126,7 +132,7 @@ int mbedtls_everest_read_params( mbedtls_ecdh_context *ctx,
* \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*
*/
int mbedtls_everest_read_params( mbedtls_ecdh_context *ctx,
int mbedtls_everest_read_params( mbedtls_ecdh_context_everest *ctx,
const unsigned char **buf, const unsigned char *end );
/**
@ -147,8 +153,8 @@ int mbedtls_everest_read_params( mbedtls_ecdh_context *ctx,
* \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*
*/
int mbedtls_everest_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_keypair *key,
int side );
int mbedtls_everest_get_params( mbedtls_ecdh_context_everest *ctx, const mbedtls_ecp_keypair *key,
mbedtls_everest_ecdh_side side );
/**
* \brief This function generates a public key and a TLS
@ -169,7 +175,7 @@ int mbedtls_everest_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_key
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*/
int mbedtls_everest_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
int mbedtls_everest_make_public( mbedtls_ecdh_context_everest *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int( *f_rng )( void *, unsigned char *, size_t ),
void *p_rng );
@ -191,7 +197,7 @@ int mbedtls_everest_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*/
int mbedtls_everest_read_public( mbedtls_ecdh_context *ctx,
int mbedtls_everest_read_public( mbedtls_ecdh_context_everest *ctx,
const unsigned char *buf, size_t blen );
/**
@ -216,7 +222,7 @@ int mbedtls_everest_read_public( mbedtls_ecdh_context *ctx,
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*/
int mbedtls_everest_calc_secret( mbedtls_ecdh_context *ctx, size_t *olen,
int mbedtls_everest_calc_secret( mbedtls_ecdh_context_everest *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int( *f_rng )( void *, unsigned char *, size_t ),
void *p_rng );

13
3rdparty/everest/include/everest/x25519.h vendored Normal file → Executable file
View file

@ -22,14 +22,21 @@
#ifndef MBEDTLS_X25519_H
#define MBEDTLS_X25519_H
#include <mbedtls/ecdh.h>
#ifdef __cplusplus
extern "C" {
#endif
#define MBEDTLS_ECP_TLS_CURVE25519 0x1d
/**
* Defines the source of the imported EC key.
*/
typedef enum
{
MBEDTLS_X25519_ECDH_OURS, /**< Our key. */
MBEDTLS_X25519_ECDH_THEIRS, /**< The key of the peer. */
} mbedtls_x25519_ecdh_side;
/**
* \brief The x25519 context structure.
*/
@ -109,7 +116,7 @@ int mbedtls_x25519_read_params( mbedtls_x25519_context *ctx,
*
*/
int mbedtls_x25519_get_params( mbedtls_x25519_context *ctx, const mbedtls_ecp_keypair *key,
int side );
mbedtls_x25519_ecdh_side side );
/**
* \brief This function derives and exports the shared secret.

70
3rdparty/everest/library/everest.c vendored
View file

@ -41,89 +41,69 @@
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
int mbedtls_everest_setup( mbedtls_ecdh_context *ctx, int grp )
int mbedtls_everest_setup( mbedtls_ecdh_context_everest *ctx, int grp_id )
{
if( grp != MBEDTLS_ECP_DP_CURVE25519 )
if( grp_id != MBEDTLS_ECP_DP_CURVE25519 )
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
ctx->var = MBEDTLS_ECDH_VARIANT_EVEREST;
ctx->grp_id = grp;
ctx->ctx.everest_ecdh.ctx = mbedtls_calloc( 1, sizeof( mbedtls_x25519_context ) );
mbedtls_x25519_init( ctx->ctx.everest_ecdh.ctx );
mbedtls_x25519_init( &ctx->ctx );
return 0;
}
void mbedtls_everest_free( mbedtls_ecdh_context *ctx )
void mbedtls_everest_free( mbedtls_ecdh_context_everest *ctx )
{
mbedtls_ecdh_context_everest *everest_ctx = &ctx->ctx.everest_ecdh;
mbedtls_x25519_context *x25519_ctx = ( mbedtls_x25519_context* )everest_ctx->ctx;
mbedtls_x25519_free( x25519_ctx );
mbedtls_free( x25519_ctx );
ctx->var = MBEDTLS_ECDH_VARIANT_NONE;
ctx->grp_id = MBEDTLS_ECP_DP_NONE;
mbedtls_x25519_free( &ctx->ctx );
}
int mbedtls_everest_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
int mbedtls_everest_make_params( mbedtls_ecdh_context_everest *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int( *f_rng )( void *, unsigned char *, size_t ),
void *p_rng )
{
mbedtls_ecdh_context_everest *everest_ctx = &ctx->ctx.everest_ecdh;
mbedtls_x25519_context *x25519_ctx = ( mbedtls_x25519_context* )everest_ctx->ctx;
if( ctx->var != MBEDTLS_ECDH_VARIANT_EVEREST ) return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
return mbedtls_x25519_make_params( x25519_ctx, olen, buf, blen, f_rng, p_rng );
}
int mbedtls_everest_read_params( mbedtls_ecdh_context *ctx,
const unsigned char **buf, const unsigned char *end )
int mbedtls_everest_read_params( mbedtls_ecdh_context_everest *ctx,
const unsigned char **buf,
const unsigned char *end )
{
mbedtls_ecdh_context_everest *everest_ctx = &ctx->ctx.everest_ecdh;
mbedtls_x25519_context *x25519_ctx = ( mbedtls_x25519_context* )everest_ctx->ctx;
if( ctx->var != MBEDTLS_ECDH_VARIANT_EVEREST ) return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
return mbedtls_x25519_read_params( x25519_ctx, buf, end );
}
int mbedtls_everest_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_keypair *key,
int side )
int mbedtls_everest_get_params( mbedtls_ecdh_context_everest *ctx,
const mbedtls_ecp_keypair *key,
mbedtls_everest_ecdh_side side )
{
mbedtls_ecdh_context_everest *everest_ctx = &ctx->ctx.everest_ecdh;
mbedtls_x25519_context *x25519_ctx = ( mbedtls_x25519_context* )everest_ctx->ctx;
if( ctx->var != MBEDTLS_ECDH_VARIANT_EVEREST ) return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
return mbedtls_x25519_get_params( x25519_ctx, key, side );
mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
mbedtls_x25519_ecdh_side s = side == MBEDTLS_EVEREST_ECDH_OURS ?
MBEDTLS_X25519_ECDH_OURS :
MBEDTLS_X25519_ECDH_THEIRS;
return mbedtls_x25519_get_params( x25519_ctx, key, s );
}
int mbedtls_everest_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
int mbedtls_everest_make_public( mbedtls_ecdh_context_everest *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int( *f_rng )( void *, unsigned char *, size_t ),
void *p_rng )
{
mbedtls_ecdh_context_everest *everest_ctx = &ctx->ctx.everest_ecdh;
mbedtls_x25519_context *x25519_ctx = ( mbedtls_x25519_context* )everest_ctx->ctx;
if( ctx->var != MBEDTLS_ECDH_VARIANT_EVEREST ) return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
return mbedtls_x25519_make_public( x25519_ctx, olen, buf, blen, f_rng, p_rng );
}
int mbedtls_everest_read_public( mbedtls_ecdh_context *ctx,
int mbedtls_everest_read_public( mbedtls_ecdh_context_everest *ctx,
const unsigned char *buf, size_t blen )
{
mbedtls_ecdh_context_everest *everest_ctx = &ctx->ctx.everest_ecdh;
mbedtls_x25519_context *x25519_ctx = ( mbedtls_x25519_context* )everest_ctx->ctx;
if( ctx->var != MBEDTLS_ECDH_VARIANT_EVEREST ) return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
return mbedtls_x25519_read_public ( x25519_ctx, buf, blen );
}
int mbedtls_everest_calc_secret( mbedtls_ecdh_context *ctx, size_t *olen,
int mbedtls_everest_calc_secret( mbedtls_ecdh_context_everest *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int( *f_rng )( void *, unsigned char *, size_t ),
void *p_rng )
{
mbedtls_ecdh_context_everest *everest_ctx = &ctx->ctx.everest_ecdh;
mbedtls_x25519_context *x25519_ctx = ( mbedtls_x25519_context* )everest_ctx->ctx;
if( ctx->var != MBEDTLS_ECDH_VARIANT_EVEREST ) return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
return mbedtls_x25519_calc_secret( x25519_ctx, olen, buf, blen, f_rng, p_rng );
}

8
3rdparty/everest/library/x25519.c vendored Normal file → Executable file
View file

@ -27,6 +27,8 @@
#if defined(MBEDTLS_ECDH_C)
#include <mbedtls/ecdh.h>
#include <Hacl_Curve25519.h>
#include <mbedtls/platform_util.h>
@ -100,16 +102,16 @@ int mbedtls_x25519_read_params( mbedtls_x25519_context *ctx,
}
int mbedtls_x25519_get_params( mbedtls_x25519_context *ctx, const mbedtls_ecp_keypair *key,
int side )
mbedtls_x25519_ecdh_side side )
{
size_t olen = 0;
switch( side ) {
case MBEDTLS_ECDH_THEIRS:
case MBEDTLS_X25519_ECDH_THEIRS:
mbedtls_ecp_point_write_binary( &key->grp, &key->Q, MBEDTLS_ECP_PF_COMPRESSED, &olen, ctx->peer_point, 32 );
/* untested; defensively throw an error for now. */
return(MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE);
case MBEDTLS_ECDH_OURS:
case MBEDTLS_X25519_ECDH_OURS:
mbedtls_mpi_write_binary( &key->d, ctx->our_secret, 32 );
/* CMW: key->Q = key->d * base; do we need to set up ctx.peer_point here? */
/* untested; defensively throw an error for now. */

35
library/ecdh.c
View file

@ -221,8 +221,12 @@ int mbedtls_ecdh_setup( mbedtls_ecdh_context *ctx, mbedtls_ecp_group_id grp_id )
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECP_DP_CURVE25519:
return( mbedtls_everest_setup( ctx, grp_id ) );
break;
{
ctx->point_format = MBEDTLS_ECP_PF_COMPRESSED;
ctx->var = MBEDTLS_ECDH_VARIANT_EVEREST;
ctx->grp_id = grp_id;
return( mbedtls_everest_setup( &ctx->ctx.everest_ecdh, grp_id ) );
}
#endif
default:
ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
@ -277,7 +281,9 @@ void mbedtls_ecdh_free( mbedtls_ecdh_context *ctx )
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECDH_VARIANT_EVEREST:
mbedtls_everest_free( ctx );
mbedtls_everest_free( &ctx->ctx.everest_ecdh );
ctx->var = MBEDTLS_ECDH_VARIANT_NONE;
ctx->grp_id = MBEDTLS_ECP_DP_NONE;
break;
#endif
case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
@ -376,7 +382,8 @@ int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECDH_VARIANT_EVEREST:
return( mbedtls_everest_make_params( ctx, olen, buf, blen, f_rng, p_rng ) );
return( mbedtls_everest_make_params( &ctx->ctx.everest_ecdh, olen,
buf, blen, f_rng, p_rng ) );
#endif
case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
return( ecdh_make_params_internal( &ctx->ctx.mbed_ecdh, olen,
@ -429,7 +436,8 @@ int mbedtls_ecdh_read_params( mbedtls_ecdh_context *ctx,
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECDH_VARIANT_EVEREST:
return( mbedtls_everest_read_params( ctx, buf, end) );
return( mbedtls_everest_read_params( &ctx->ctx.everest_ecdh,
buf, end) );
#endif
case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
return( ecdh_read_params_internal( &ctx->ctx.mbed_ecdh,
@ -497,7 +505,13 @@ int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx,
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECDH_VARIANT_EVEREST:
return( mbedtls_everest_get_params( ctx, key, side ) );
{
mbedtls_x25519_ecdh_side s = side == MBEDTLS_ECDH_OURS ?
MBEDTLS_EVEREST_ECDH_OURS :
MBEDTLS_EVEREST_ECDH_THEIRS;
return( mbedtls_everest_get_params( &ctx->ctx.everest_ecdh,
key, s) );
}
#endif
case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
return( ecdh_get_params_internal( &ctx->ctx.mbed_ecdh,
@ -572,7 +586,8 @@ int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECDH_VARIANT_EVEREST:
return( mbedtls_everest_make_public( ctx, olen, buf, blen, f_rng, p_rng ) );
return( mbedtls_everest_make_public( &ctx->ctx.everest_ecdh, olen,
buf, blen, f_rng, p_rng ) );
#endif
case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
return( ecdh_make_public_internal( &ctx->ctx.mbed_ecdh, olen,
@ -617,7 +632,8 @@ int mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx,
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECDH_VARIANT_EVEREST:
return( mbedtls_everest_read_public( ctx, buf, blen ) );
return( mbedtls_everest_read_public( &ctx->ctx.everest_ecdh,
buf, blen ) );
#endif
case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
return( ecdh_read_public_internal( &ctx->ctx.mbed_ecdh,
@ -703,7 +719,8 @@ int mbedtls_ecdh_calc_secret( mbedtls_ecdh_context *ctx, size_t *olen,
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECDH_VARIANT_EVEREST:
return( mbedtls_everest_calc_secret( ctx, olen, buf, blen, f_rng, p_rng ) );
return( mbedtls_everest_calc_secret( &ctx->ctx.everest_ecdh, olen,
buf, blen, f_rng, p_rng ) );
#endif
case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
return( ecdh_calc_secret_internal( &ctx->ctx.mbed_ecdh, olen, buf,