Removed openssl, and curl, and added mbedded tls.curl-removal

Almost fully removed curl, needs more testing.

Fixed most issues, now trying to cross compile.

Fix?

Sigh.

1 files changed, 729 insertions, 0 deletions

diff --git a/lib/mbedtls-2.27.0/library/ecdh.c b/lib/mbedtls-2.27.0/library/ecdh.c
new file mode 100644
index 0000000..9dfa868
--- /dev/null
+++ b/lib/mbedtls-2.27.0/library/ecdh.c
@@ -0,0 +1,729 @@
+/*
+ *  Elliptic curve Diffie-Hellman
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/*
+ * References:
+ *
+ * SEC1 http://www.secg.org/index.php?action=secg,docs_secg
+ * RFC 4492
+ */
+
+#include "common.h"
+
+#if defined(MBEDTLS_ECDH_C)
+
+#include "mbedtls/ecdh.h"
+#include "mbedtls/platform_util.h"
+#include "mbedtls/error.h"
+
+#include <string.h>
+
+/* Parameter validation macros based on platform_util.h */
+#define ECDH_VALIDATE_RET( cond )    \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA )
+#define ECDH_VALIDATE( cond )        \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+typedef mbedtls_ecdh_context mbedtls_ecdh_context_mbed;
+#endif
+
+static mbedtls_ecp_group_id mbedtls_ecdh_grp_id(
+    const mbedtls_ecdh_context *ctx )
+{
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    return( ctx->grp.id );
+#else
+    return( ctx->grp_id );
+#endif
+}
+
+int mbedtls_ecdh_can_do( mbedtls_ecp_group_id gid )
+{
+    /* At this time, all groups support ECDH. */
+    (void) gid;
+    return( 1 );
+}
+
+#if !defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT)
+/*
+ * Generate public key (restartable version)
+ *
+ * Note: this internal function relies on its caller preserving the value of
+ * the output parameter 'd' across continuation calls. This would not be
+ * acceptable for a public function but is OK here as we control call sites.
+ */
+static int ecdh_gen_public_restartable( mbedtls_ecp_group *grp,
+                    mbedtls_mpi *d, mbedtls_ecp_point *Q,
+                    int (*f_rng)(void *, unsigned char *, size_t),
+                    void *p_rng,
+                    mbedtls_ecp_restart_ctx *rs_ctx )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    /* If multiplication is in progress, we already generated a privkey */
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    if( rs_ctx == NULL || rs_ctx->rsm == NULL )
+#endif
+        MBEDTLS_MPI_CHK( mbedtls_ecp_gen_privkey( grp, d, f_rng, p_rng ) );
+
+    MBEDTLS_MPI_CHK( mbedtls_ecp_mul_restartable( grp, Q, d, &grp->G,
+                                                  f_rng, p_rng, rs_ctx ) );
+
+cleanup:
+    return( ret );
+}
+
+/*
+ * Generate public key
+ */
+int mbedtls_ecdh_gen_public( mbedtls_ecp_group *grp, mbedtls_mpi *d, mbedtls_ecp_point *Q,
+                     int (*f_rng)(void *, unsigned char *, size_t),
+                     void *p_rng )
+{
+    ECDH_VALIDATE_RET( grp != NULL );
+    ECDH_VALIDATE_RET( d != NULL );
+    ECDH_VALIDATE_RET( Q != NULL );
+    ECDH_VALIDATE_RET( f_rng != NULL );
+    return( ecdh_gen_public_restartable( grp, d, Q, f_rng, p_rng, NULL ) );
+}
+#endif /* !MBEDTLS_ECDH_GEN_PUBLIC_ALT */
+
+#if !defined(MBEDTLS_ECDH_COMPUTE_SHARED_ALT)
+/*
+ * Compute shared secret (SEC1 3.3.1)
+ */
+static int ecdh_compute_shared_restartable( mbedtls_ecp_group *grp,
+                         mbedtls_mpi *z,
+                         const mbedtls_ecp_point *Q, const mbedtls_mpi *d,
+                         int (*f_rng)(void *, unsigned char *, size_t),
+                         void *p_rng,
+                         mbedtls_ecp_restart_ctx *rs_ctx )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    mbedtls_ecp_point P;
+
+    mbedtls_ecp_point_init( &P );
+
+    MBEDTLS_MPI_CHK( mbedtls_ecp_mul_restartable( grp, &P, d, Q,
+                                                  f_rng, p_rng, rs_ctx ) );
+
+    if( mbedtls_ecp_is_zero( &P ) )
+    {
+        ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+        goto cleanup;
+    }
+
+    MBEDTLS_MPI_CHK( mbedtls_mpi_copy( z, &P.X ) );
+
+cleanup:
+    mbedtls_ecp_point_free( &P );
+
+    return( ret );
+}
+
+/*
+ * Compute shared secret (SEC1 3.3.1)
+ */
+int mbedtls_ecdh_compute_shared( mbedtls_ecp_group *grp, mbedtls_mpi *z,
+                         const mbedtls_ecp_point *Q, const mbedtls_mpi *d,
+                         int (*f_rng)(void *, unsigned char *, size_t),
+                         void *p_rng )
+{
+    ECDH_VALIDATE_RET( grp != NULL );
+    ECDH_VALIDATE_RET( Q != NULL );
+    ECDH_VALIDATE_RET( d != NULL );
+    ECDH_VALIDATE_RET( z != NULL );
+    return( ecdh_compute_shared_restartable( grp, z, Q, d,
+                                             f_rng, p_rng, NULL ) );
+}
+#endif /* !MBEDTLS_ECDH_COMPUTE_SHARED_ALT */
+
+static void ecdh_init_internal( mbedtls_ecdh_context_mbed *ctx )
+{
+    mbedtls_ecp_group_init( &ctx->grp );
+    mbedtls_mpi_init( &ctx->d  );
+    mbedtls_ecp_point_init( &ctx->Q   );
+    mbedtls_ecp_point_init( &ctx->Qp  );
+    mbedtls_mpi_init( &ctx->z  );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    mbedtls_ecp_restart_init( &ctx->rs );
+#endif
+}
+
+/*
+ * Initialize context
+ */
+void mbedtls_ecdh_init( mbedtls_ecdh_context *ctx )
+{
+    ECDH_VALIDATE( ctx != NULL );
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    ecdh_init_internal( ctx );
+    mbedtls_ecp_point_init( &ctx->Vi  );
+    mbedtls_ecp_point_init( &ctx->Vf  );
+    mbedtls_mpi_init( &ctx->_d );
+#else
+    memset( ctx, 0, sizeof( mbedtls_ecdh_context ) );
+
+    ctx->var = MBEDTLS_ECDH_VARIANT_NONE;
+#endif
+    ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    ctx->restart_enabled = 0;
+#endif
+}
+
+static int ecdh_setup_internal( mbedtls_ecdh_context_mbed *ctx,
+                                mbedtls_ecp_group_id grp_id )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    ret = mbedtls_ecp_group_load( &ctx->grp, grp_id );
+    if( ret != 0 )
+    {
+        return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
+    }
+
+    return( 0 );
+}
+
+/*
+ * Setup context
+ */
+int mbedtls_ecdh_setup( mbedtls_ecdh_context *ctx, mbedtls_ecp_group_id grp_id )
+{
+    ECDH_VALIDATE_RET( ctx != NULL );
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    return( ecdh_setup_internal( ctx, grp_id ) );
+#else
+    switch( grp_id )
+    {
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+        case MBEDTLS_ECP_DP_CURVE25519:
+            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;
+            ctx->var = MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0;
+            ctx->grp_id = grp_id;
+            ecdh_init_internal( &ctx->ctx.mbed_ecdh );
+            return( ecdh_setup_internal( &ctx->ctx.mbed_ecdh, grp_id ) );
+    }
+#endif
+}
+
+static void ecdh_free_internal( mbedtls_ecdh_context_mbed *ctx )
+{
+    mbedtls_ecp_group_free( &ctx->grp );
+    mbedtls_mpi_free( &ctx->d  );
+    mbedtls_ecp_point_free( &ctx->Q   );
+    mbedtls_ecp_point_free( &ctx->Qp  );
+    mbedtls_mpi_free( &ctx->z  );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    mbedtls_ecp_restart_free( &ctx->rs );
+#endif
+}
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+/*
+ * Enable restartable operations for context
+ */
+void mbedtls_ecdh_enable_restart( mbedtls_ecdh_context *ctx )
+{
+    ECDH_VALIDATE( ctx != NULL );
+
+    ctx->restart_enabled = 1;
+}
+#endif
+
+/*
+ * Free context
+ */
+void mbedtls_ecdh_free( mbedtls_ecdh_context *ctx )
+{
+    if( ctx == NULL )
+        return;
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    mbedtls_ecp_point_free( &ctx->Vi );
+    mbedtls_ecp_point_free( &ctx->Vf );
+    mbedtls_mpi_free( &ctx->_d );
+    ecdh_free_internal( ctx );
+#else
+    switch( ctx->var )
+    {
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+        case MBEDTLS_ECDH_VARIANT_EVEREST:
+            mbedtls_everest_free( &ctx->ctx.everest_ecdh );
+            break;
+#endif
+        case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
+            ecdh_free_internal( &ctx->ctx.mbed_ecdh );
+            break;
+        default:
+            break;
+    }
+
+    ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
+    ctx->var = MBEDTLS_ECDH_VARIANT_NONE;
+    ctx->grp_id = MBEDTLS_ECP_DP_NONE;
+#endif
+}
+
+static int ecdh_make_params_internal( mbedtls_ecdh_context_mbed *ctx,
+                                      size_t *olen, int point_format,
+                                      unsigned char *buf, size_t blen,
+                                      int (*f_rng)(void *,
+                                                   unsigned char *,
+                                                   size_t),
+                                      void *p_rng,
+                                      int restart_enabled )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    size_t grp_len, pt_len;
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    mbedtls_ecp_restart_ctx *rs_ctx = NULL;
+#endif
+
+    if( ctx->grp.pbits == 0 )
+        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    if( restart_enabled )
+        rs_ctx = &ctx->rs;
+#else
+    (void) restart_enabled;
+#endif
+
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    if( ( ret = ecdh_gen_public_restartable( &ctx->grp, &ctx->d, &ctx->Q,
+                                             f_rng, p_rng, rs_ctx ) ) != 0 )
+        return( ret );
+#else
+    if( ( ret = mbedtls_ecdh_gen_public( &ctx->grp, &ctx->d, &ctx->Q,
+                                         f_rng, p_rng ) ) != 0 )
+        return( ret );
+#endif /* MBEDTLS_ECP_RESTARTABLE */
+
+    if( ( ret = mbedtls_ecp_tls_write_group( &ctx->grp, &grp_len, buf,
+                                             blen ) ) != 0 )
+        return( ret );
+
+    buf += grp_len;
+    blen -= grp_len;
+
+    if( ( ret = mbedtls_ecp_tls_write_point( &ctx->grp, &ctx->Q, point_format,
+                                             &pt_len, buf, blen ) ) != 0 )
+        return( ret );
+
+    *olen = grp_len + pt_len;
+    return( 0 );
+}
+
+/*
+ * Setup and write the ServerKeyExchange parameters (RFC 4492)
+ *      struct {
+ *          ECParameters    curve_params;
+ *          ECPoint         public;
+ *      } ServerECDHParams;
+ */
+int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
+                              unsigned char *buf, size_t blen,
+                              int (*f_rng)(void *, unsigned char *, size_t),
+                              void *p_rng )
+{
+    int restart_enabled = 0;
+    ECDH_VALIDATE_RET( ctx != NULL );
+    ECDH_VALIDATE_RET( olen != NULL );
+    ECDH_VALIDATE_RET( buf != NULL );
+    ECDH_VALIDATE_RET( f_rng != NULL );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    restart_enabled = ctx->restart_enabled;
+#else
+    (void) restart_enabled;
+#endif
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    return( ecdh_make_params_internal( ctx, olen, ctx->point_format, buf, blen,
+                                       f_rng, p_rng, restart_enabled ) );
+#else
+    switch( ctx->var )
+    {
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+        case MBEDTLS_ECDH_VARIANT_EVEREST:
+            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,
+                                               ctx->point_format, buf, blen,
+                                               f_rng, p_rng,
+                                               restart_enabled ) );
+        default:
+            return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+    }
+#endif
+}
+
+static int ecdh_read_params_internal( mbedtls_ecdh_context_mbed *ctx,
+                                      const unsigned char **buf,
+                                      const unsigned char *end )
+{
+    return( mbedtls_ecp_tls_read_point( &ctx->grp, &ctx->Qp, buf,
+                                        end - *buf ) );
+}
+
+/*
+ * Read the ServerKeyExhange parameters (RFC 4492)
+ *      struct {
+ *          ECParameters    curve_params;
+ *          ECPoint         public;
+ *      } ServerECDHParams;
+ */
+int mbedtls_ecdh_read_params( mbedtls_ecdh_context *ctx,
+                              const unsigned char **buf,
+                              const unsigned char *end )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    mbedtls_ecp_group_id grp_id;
+    ECDH_VALIDATE_RET( ctx != NULL );
+    ECDH_VALIDATE_RET( buf != NULL );
+    ECDH_VALIDATE_RET( *buf != NULL );
+    ECDH_VALIDATE_RET( end != NULL );
+
+    if( ( ret = mbedtls_ecp_tls_read_group_id( &grp_id, buf, end - *buf ) )
+            != 0 )
+        return( ret );
+
+    if( ( ret = mbedtls_ecdh_setup( ctx, grp_id ) ) != 0 )
+        return( ret );
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    return( ecdh_read_params_internal( ctx, buf, end ) );
+#else
+    switch( ctx->var )
+    {
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+        case MBEDTLS_ECDH_VARIANT_EVEREST:
+            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,
+                                               buf, end ) );
+        default:
+            return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+    }
+#endif
+}
+
+static int ecdh_get_params_internal( mbedtls_ecdh_context_mbed *ctx,
+                                     const mbedtls_ecp_keypair *key,
+                                     mbedtls_ecdh_side side )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    /* If it's not our key, just import the public part as Qp */
+    if( side == MBEDTLS_ECDH_THEIRS )
+        return( mbedtls_ecp_copy( &ctx->Qp, &key->Q ) );
+
+    /* Our key: import public (as Q) and private parts */
+    if( side != MBEDTLS_ECDH_OURS )
+        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+
+    if( ( ret = mbedtls_ecp_copy( &ctx->Q, &key->Q ) ) != 0 ||
+        ( ret = mbedtls_mpi_copy( &ctx->d, &key->d ) ) != 0 )
+        return( ret );
+
+    return( 0 );
+}
+
+/*
+ * Get parameters from a keypair
+ */
+int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx,
+                             const mbedtls_ecp_keypair *key,
+                             mbedtls_ecdh_side side )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    ECDH_VALIDATE_RET( ctx != NULL );
+    ECDH_VALIDATE_RET( key != NULL );
+    ECDH_VALIDATE_RET( side == MBEDTLS_ECDH_OURS ||
+                       side == MBEDTLS_ECDH_THEIRS );
+
+    if( mbedtls_ecdh_grp_id( ctx ) == MBEDTLS_ECP_DP_NONE )
+    {
+        /* This is the first call to get_params(). Set up the context
+         * for use with the group. */
+        if( ( ret = mbedtls_ecdh_setup( ctx, key->grp.id ) ) != 0 )
+            return( ret );
+    }
+    else
+    {
+        /* This is not the first call to get_params(). Check that the
+         * current key's group is the same as the context's, which was set
+         * from the first key's group. */
+        if( mbedtls_ecdh_grp_id( ctx ) != key->grp.id )
+            return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+    }
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    return( ecdh_get_params_internal( ctx, key, side ) );
+#else
+    switch( ctx->var )
+    {
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+        case MBEDTLS_ECDH_VARIANT_EVEREST:
+        {
+            mbedtls_everest_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,
+                                              key, side ) );
+        default:
+            return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+    }
+#endif
+}
+
+static int ecdh_make_public_internal( mbedtls_ecdh_context_mbed *ctx,
+                                      size_t *olen, int point_format,
+                                      unsigned char *buf, size_t blen,
+                                      int (*f_rng)(void *,
+                                                   unsigned char *,
+                                                   size_t),
+                                      void *p_rng,
+                                      int restart_enabled )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    mbedtls_ecp_restart_ctx *rs_ctx = NULL;
+#endif
+
+    if( ctx->grp.pbits == 0 )
+        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    if( restart_enabled )
+        rs_ctx = &ctx->rs;
+#else
+    (void) restart_enabled;
+#endif
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    if( ( ret = ecdh_gen_public_restartable( &ctx->grp, &ctx->d, &ctx->Q,
+                                             f_rng, p_rng, rs_ctx ) ) != 0 )
+        return( ret );
+#else
+    if( ( ret = mbedtls_ecdh_gen_public( &ctx->grp, &ctx->d, &ctx->Q,
+                                         f_rng, p_rng ) ) != 0 )
+        return( ret );
+#endif /* MBEDTLS_ECP_RESTARTABLE */
+
+    return mbedtls_ecp_tls_write_point( &ctx->grp, &ctx->Q, point_format, olen,
+                                        buf, blen );
+}
+
+/*
+ * Setup and export the client public value
+ */
+int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
+                              unsigned char *buf, size_t blen,
+                              int (*f_rng)(void *, unsigned char *, size_t),
+                              void *p_rng )
+{
+    int restart_enabled = 0;
+    ECDH_VALIDATE_RET( ctx != NULL );
+    ECDH_VALIDATE_RET( olen != NULL );
+    ECDH_VALIDATE_RET( buf != NULL );
+    ECDH_VALIDATE_RET( f_rng != NULL );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    restart_enabled = ctx->restart_enabled;
+#endif
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    return( ecdh_make_public_internal( ctx, olen, ctx->point_format, buf, blen,
+                                       f_rng, p_rng, restart_enabled ) );
+#else
+    switch( ctx->var )
+    {
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+        case MBEDTLS_ECDH_VARIANT_EVEREST:
+            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,
+                                               ctx->point_format, buf, blen,
+                                               f_rng, p_rng,
+                                               restart_enabled ) );
+        default:
+            return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+    }
+#endif
+}
+
+static int ecdh_read_public_internal( mbedtls_ecdh_context_mbed *ctx,
+                                      const unsigned char *buf, size_t blen )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    const unsigned char *p = buf;
+
+    if( ( ret = mbedtls_ecp_tls_read_point( &ctx->grp, &ctx->Qp, &p,
+                                            blen ) ) != 0 )
+        return( ret );
+
+    if( (size_t)( p - buf ) != blen )
+        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+
+    return( 0 );
+}
+
+/*
+ * Parse and import the client's public value
+ */
+int mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx,
+                              const unsigned char *buf, size_t blen )
+{
+    ECDH_VALIDATE_RET( ctx != NULL );
+    ECDH_VALIDATE_RET( buf != NULL );
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    return( ecdh_read_public_internal( ctx, buf, blen ) );
+#else
+    switch( ctx->var )
+    {
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+        case MBEDTLS_ECDH_VARIANT_EVEREST:
+            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,
+                                                       buf, blen ) );
+        default:
+            return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+    }
+#endif
+}
+
+static int ecdh_calc_secret_internal( mbedtls_ecdh_context_mbed *ctx,
+                                      size_t *olen, unsigned char *buf,
+                                      size_t blen,
+                                      int (*f_rng)(void *,
+                                                   unsigned char *,
+                                                   size_t),
+                                      void *p_rng,
+                                      int restart_enabled )
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    mbedtls_ecp_restart_ctx *rs_ctx = NULL;
+#endif
+
+    if( ctx == NULL || ctx->grp.pbits == 0 )
+        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    if( restart_enabled )
+        rs_ctx = &ctx->rs;
+#else
+    (void) restart_enabled;
+#endif
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    if( ( ret = ecdh_compute_shared_restartable( &ctx->grp, &ctx->z, &ctx->Qp,
+                                                 &ctx->d, f_rng, p_rng,
+                                                 rs_ctx ) ) != 0 )
+    {
+        return( ret );
+    }
+#else
+    if( ( ret = mbedtls_ecdh_compute_shared( &ctx->grp, &ctx->z, &ctx->Qp,
+                                             &ctx->d, f_rng, p_rng ) ) != 0 )
+    {
+        return( ret );
+    }
+#endif /* MBEDTLS_ECP_RESTARTABLE */
+
+    if( mbedtls_mpi_size( &ctx->z ) > blen )
+        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+
+    *olen = ctx->grp.pbits / 8 + ( ( ctx->grp.pbits % 8 ) != 0 );
+
+    if( mbedtls_ecp_get_type( &ctx->grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
+        return mbedtls_mpi_write_binary_le( &ctx->z, buf, *olen );
+
+    return mbedtls_mpi_write_binary( &ctx->z, buf, *olen );
+}
+
+/*
+ * Derive and export the shared secret
+ */
+int mbedtls_ecdh_calc_secret( mbedtls_ecdh_context *ctx, size_t *olen,
+                              unsigned char *buf, size_t blen,
+                              int (*f_rng)(void *, unsigned char *, size_t),
+                              void *p_rng )
+{
+    int restart_enabled = 0;
+    ECDH_VALIDATE_RET( ctx != NULL );
+    ECDH_VALIDATE_RET( olen != NULL );
+    ECDH_VALIDATE_RET( buf != NULL );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    restart_enabled = ctx->restart_enabled;
+#endif
+
+#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+    return( ecdh_calc_secret_internal( ctx, olen, buf, blen, f_rng, p_rng,
+                                       restart_enabled ) );
+#else
+    switch( ctx->var )
+    {
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+        case MBEDTLS_ECDH_VARIANT_EVEREST:
+            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,
+                                               blen, f_rng, p_rng,
+                                               restart_enabled ) );
+        default:
+            return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+    }
+#endif
+}
+
+#endif /* MBEDTLS_ECDH_C */