ECDH: Make the implementation use the new context
The functionality from public API functions are moved to `xxx_internal()` functions. The public API functions are modified to do basic parameter validation and dispatch the call to the right implementation. There is no intended change in behaviour when `MBEDTLS_ECDH_LEGACY_CONTEXT` is enabled.
This commit is contained in:
Janos Follath
parent
52735ef2fe
commit
5a3e1bfda0
1 changed files with 304 additions and 70 deletions
374
library/ecdh.c
374
library/ecdh.c
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@ -38,6 +38,10 @@
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#include <string.h>
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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typedef mbedtls_ecdh_context mbedtls_ecdh_context_mbed;
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#endif
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#if !defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT)
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/*
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* Generate public key (restartable version)
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@ -124,38 +128,48 @@ int mbedtls_ecdh_compute_shared( mbedtls_ecp_group *grp, mbedtls_mpi *z,
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}
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#endif /* !MBEDTLS_ECDH_COMPUTE_SHARED_ALT */
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/*
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* Initialize context
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*/
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void mbedtls_ecdh_init( mbedtls_ecdh_context *ctx )
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static void ecdh_init_internal( mbedtls_ecdh_context_mbed *ctx )
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{
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mbedtls_ecp_group_init( &ctx->grp );
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mbedtls_mpi_init( &ctx->d );
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mbedtls_ecp_point_init( &ctx->Q );
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mbedtls_ecp_point_init( &ctx->Qp );
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mbedtls_mpi_init( &ctx->z );
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ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
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mbedtls_ecp_point_init( &ctx->Vi );
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mbedtls_ecp_point_init( &ctx->Vf );
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mbedtls_mpi_init( &ctx->_d );
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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ctx->restart_enabled = 0;
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mbedtls_ecp_restart_init( &ctx->rs );
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#endif
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}
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/*
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* Setup context
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* Initialize context
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*/
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int mbedtls_ecdh_setup( mbedtls_ecdh_context *ctx, mbedtls_ecp_group_id grp_id )
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void mbedtls_ecdh_init( mbedtls_ecdh_context *ctx )
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{
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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ecdh_init_internal( ctx );
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mbedtls_ecp_point_init( &ctx->Vi );
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mbedtls_ecp_point_init( &ctx->Vf );
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mbedtls_mpi_init( &ctx->_d );
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#else
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memset( ctx, 0, sizeof( mbedtls_ecdh_context ) );
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ctx->var = MBEDTLS_ECDH_VARIANT_NONE;
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#endif
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ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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ctx->restart_enabled = 0;
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#endif
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}
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static int ecdh_setup_internal( mbedtls_ecdh_context_mbed *ctx,
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mbedtls_ecp_group_id grp_id )
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{
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int ret;
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ret = mbedtls_ecp_group_load( &ctx->grp, grp_id );
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if( ret != 0 )
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{
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mbedtls_ecdh_free( ctx );
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return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
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}
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@ -163,21 +177,35 @@ int mbedtls_ecdh_setup( mbedtls_ecdh_context *ctx, mbedtls_ecp_group_id grp_id )
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}
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/*
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* Free context
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* Setup context
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*/
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void mbedtls_ecdh_free( mbedtls_ecdh_context *ctx )
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int mbedtls_ecdh_setup( mbedtls_ecdh_context *ctx, mbedtls_ecp_group_id grp_id )
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{
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if( ctx == NULL )
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return;
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return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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return( ecdh_setup_internal( ctx, grp_id ) );
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#else
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switch( grp_id )
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{
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default:
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ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
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ctx->var = MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0;
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ctx->grp_id = grp_id;
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ecdh_init_internal( &ctx->ctx.mbed_ecdh );
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return( ecdh_setup_internal( &ctx->ctx.mbed_ecdh, grp_id ) );
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}
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#endif
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}
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static void ecdh_free_internal( mbedtls_ecdh_context_mbed *ctx )
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{
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mbedtls_ecp_group_free( &ctx->grp );
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mbedtls_mpi_free( &ctx->d );
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mbedtls_ecp_point_free( &ctx->Q );
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mbedtls_ecp_point_free( &ctx->Qp );
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mbedtls_mpi_free( &ctx->z );
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mbedtls_ecp_point_free( &ctx->Vi );
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mbedtls_ecp_point_free( &ctx->Vf );
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mbedtls_mpi_free( &ctx->_d );
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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mbedtls_ecp_restart_free( &ctx->rs );
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@ -190,21 +218,50 @@ void mbedtls_ecdh_free( mbedtls_ecdh_context *ctx )
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*/
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void mbedtls_ecdh_enable_restart( mbedtls_ecdh_context *ctx )
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{
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if( ctx == NULL )
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return;
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ctx->restart_enabled = 1;
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}
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#endif
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/*
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* Setup and write the ServerKeyExhange parameters (RFC 4492)
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* struct {
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* ECParameters curve_params;
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* ECPoint public;
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* } ServerECDHParams;
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* Free context
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*/
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int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
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unsigned char *buf, size_t blen,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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void mbedtls_ecdh_free( mbedtls_ecdh_context *ctx )
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{
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if( ctx == NULL )
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return;
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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mbedtls_ecp_point_free( &ctx->Vi );
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mbedtls_ecp_point_free( &ctx->Vf );
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mbedtls_mpi_free( &ctx->_d );
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ecdh_free_internal( ctx );
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#else
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switch( ctx->var )
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{
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case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
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ecdh_free_internal( &ctx->ctx.mbed_ecdh );
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break;
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default:
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break;
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}
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ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
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ctx->var = MBEDTLS_ECDH_VARIANT_NONE;
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ctx->grp_id = MBEDTLS_ECP_DP_NONE;
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#endif
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}
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static int ecdh_make_params_internal( mbedtls_ecdh_context_mbed *ctx,
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size_t *olen, int point_format,
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unsigned char *buf, size_t blen,
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int (*f_rng)(void *,
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unsigned char *,
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size_t),
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void *p_rng,
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int restart_enabled )
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{
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int ret;
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size_t grp_len, pt_len;
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@ -212,12 +269,14 @@ int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
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mbedtls_ecp_restart_ctx *rs_ctx = NULL;
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#endif
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if( ctx == NULL || ctx->grp.pbits == 0 )
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if( ctx->grp.pbits == 0 )
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return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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if( ctx->restart_enabled )
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if( restart_enabled )
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rs_ctx = &ctx->rs;
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#else
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(void) restart_enabled;
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#endif
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@ -231,14 +290,14 @@ int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
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return( ret );
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#endif /* MBEDTLS_ECP_RESTARTABLE */
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if( ( ret = mbedtls_ecp_tls_write_group( &ctx->grp, &grp_len, buf, blen ) )
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!= 0 )
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if( ( ret = mbedtls_ecp_tls_write_group( &ctx->grp, &grp_len, buf,
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blen ) ) != 0 )
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return( ret );
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buf += grp_len;
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blen -= grp_len;
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if( ( ret = mbedtls_ecp_tls_write_point( &ctx->grp, &ctx->Q, ctx->point_format,
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if( ( ret = mbedtls_ecp_tls_write_point( &ctx->grp, &ctx->Q, point_format,
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&pt_len, buf, blen ) ) != 0 )
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return( ret );
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@ -246,6 +305,54 @@ int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
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return( 0 );
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}
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/*
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* Setup and write the ServerKeyExhange parameters (RFC 4492)
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* struct {
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* ECParameters curve_params;
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* ECPoint public;
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* } ServerECDHParams;
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*/
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int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
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unsigned char *buf, size_t blen,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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{
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int restart_enabled = 0;
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if( ctx == NULL )
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return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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restart_enabled = ctx->restart_enabled;
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#else
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(void) restart_enabled;
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#endif
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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return( ecdh_make_params_internal( ctx, olen, ctx->point_format, buf, blen,
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f_rng, p_rng, restart_enabled ) );
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#else
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switch( ctx->var )
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{
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case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
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return( ecdh_make_params_internal( &ctx->ctx.mbed_ecdh, olen,
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ctx->point_format, buf, blen,
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f_rng, p_rng,
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restart_enabled ) );
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default:
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return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
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}
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#endif
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}
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static int ecdh_read_params_internal( mbedtls_ecdh_context_mbed *ctx,
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const unsigned char **buf,
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const unsigned char *end )
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{
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return( mbedtls_ecp_tls_read_point( &ctx->grp, &ctx->Qp, buf,
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end - *buf ) );
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}
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/*
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* Read the ServerKeyExhange parameters (RFC 4492)
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* struct {
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@ -254,11 +361,15 @@ int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
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* } ServerECDHParams;
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*/
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int mbedtls_ecdh_read_params( mbedtls_ecdh_context *ctx,
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const unsigned char **buf, const unsigned char *end )
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const unsigned char **buf,
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const unsigned char *end )
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{
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int ret;
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mbedtls_ecp_group_id grp_id;
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if( ctx == NULL )
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return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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if( ( ret = mbedtls_ecp_tls_read_group_id( &grp_id, buf, end - *buf ) )
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!= 0 )
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return( ret );
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@ -266,24 +377,26 @@ int mbedtls_ecdh_read_params( mbedtls_ecdh_context *ctx,
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if( ( ret = mbedtls_ecdh_setup( ctx, grp_id ) ) != 0 )
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return( ret );
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if( ( ret = mbedtls_ecp_tls_read_point( &ctx->grp, &ctx->Qp, buf,
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end - *buf ) ) != 0 )
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return( ret );
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return( 0 );
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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return( ecdh_read_params_internal( ctx, buf, end ) );
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#else
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switch( ctx->var )
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{
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case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
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return( ecdh_read_params_internal( &ctx->ctx.mbed_ecdh,
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buf, end ) );
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default:
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return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
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}
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#endif
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}
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/*
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* Get parameters from a keypair
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*/
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int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_keypair *key,
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mbedtls_ecdh_side side )
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static int ecdh_get_params_internal( mbedtls_ecdh_context_mbed *ctx,
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const mbedtls_ecp_keypair *key,
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mbedtls_ecdh_side side )
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{
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int ret;
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if( ( ret = mbedtls_ecdh_setup( ctx, key->grp.id ) ) != 0 )
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return( ret );
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/* If it's not our key, just import the public part as Qp */
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if( side == MBEDTLS_ECDH_THEIRS )
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return( mbedtls_ecp_copy( &ctx->Qp, &key->Q ) );
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@ -300,29 +413,61 @@ int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_keypai
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}
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/*
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* Setup and export the client public value
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* Get parameters from a keypair
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*/
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int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
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unsigned char *buf, size_t blen,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx,
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const mbedtls_ecp_keypair *key,
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mbedtls_ecdh_side side )
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{
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int ret;
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if( ctx == NULL )
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return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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if( ( ret = mbedtls_ecdh_setup( ctx, key->grp.id ) ) != 0 )
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return( ret );
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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return( ecdh_get_params_internal( ctx, key, side ) );
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#else
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switch( ctx->var )
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{
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case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
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return( ecdh_get_params_internal( &ctx->ctx.mbed_ecdh,
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key, side ) );
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default:
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return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
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}
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#endif
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}
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static int ecdh_make_public_internal( mbedtls_ecdh_context_mbed *ctx,
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size_t *olen, int point_format,
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unsigned char *buf, size_t blen,
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int (*f_rng)(void *,
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unsigned char *,
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size_t),
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void *p_rng,
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int restart_enabled )
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{
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int ret;
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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mbedtls_ecp_restart_ctx *rs_ctx = NULL;
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#endif
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if( ctx == NULL || ctx->grp.pbits == 0 )
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if( ctx->grp.pbits == 0 )
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return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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if( ctx->restart_enabled )
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if( restart_enabled )
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rs_ctx = &ctx->rs;
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#else
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(void) restart_enabled;
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#endif
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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if( ( ret = ecdh_gen_public_restartable( &ctx->grp, &ctx->d, &ctx->Q,
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f_rng, p_rng, rs_ctx ) ) != 0 )
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f_rng, p_rng, rs_ctx ) ) != 0 )
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return( ret );
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#else
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if( ( ret = mbedtls_ecdh_gen_public( &ctx->grp, &ctx->d, &ctx->Q,
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@ -330,23 +475,52 @@ int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
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return( ret );
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#endif /* MBEDTLS_ECP_RESTARTABLE */
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return mbedtls_ecp_tls_write_point( &ctx->grp, &ctx->Q, ctx->point_format,
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olen, buf, blen );
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return mbedtls_ecp_tls_write_point( &ctx->grp, &ctx->Q, point_format, olen,
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buf, blen );
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}
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/*
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* Parse and import the client's public value
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* Setup and export the client public value
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*/
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int mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx,
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const unsigned char *buf, size_t blen )
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int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
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unsigned char *buf, size_t blen,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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{
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int ret;
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const unsigned char *p = buf;
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int restart_enabled = 0;
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if( ctx == NULL )
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return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
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if( ( ret = mbedtls_ecp_tls_read_point( &ctx->grp, &ctx->Qp, &p, blen ) ) != 0 )
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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restart_enabled = ctx->restart_enabled;
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#endif
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#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
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return( ecdh_make_public_internal( ctx, olen, ctx->point_format, buf, blen,
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f_rng, p_rng, restart_enabled ) );
|
||||
#else
|
||||
switch( ctx->var )
|
||||
{
|
||||
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;
|
||||
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 )
|
||||
|
|
@ -356,12 +530,36 @@ int mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx,
|
|||
}
|
||||
|
||||
/*
|
||||
* Derive and export the shared secret
|
||||
* Parse and import the client's public value
|
||||
*/
|
||||
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 mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx,
|
||||
const unsigned char *buf, size_t blen )
|
||||
{
|
||||
if( ctx == NULL )
|
||||
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
|
||||
|
||||
#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
|
||||
return( ecdh_read_public_internal( ctx, buf, blen ) );
|
||||
#else
|
||||
switch( ctx->var )
|
||||
{
|
||||
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;
|
||||
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
||||
|
|
@ -372,13 +570,16 @@ int mbedtls_ecdh_calc_secret( mbedtls_ecdh_context *ctx, size_t *olen,
|
|||
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
|
||||
|
||||
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
||||
if( ctx->restart_enabled )
|
||||
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 )
|
||||
if( ( ret = ecdh_compute_shared_restartable( &ctx->grp, &ctx->z, &ctx->Qp,
|
||||
&ctx->d, f_rng, p_rng,
|
||||
rs_ctx ) ) != 0 )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
|
|
@ -397,4 +598,37 @@ int mbedtls_ecdh_calc_secret( mbedtls_ecdh_context *ctx, size_t *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;
|
||||
|
||||
if( ctx == NULL )
|
||||
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
|
||||
|
||||
#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 )
|
||||
{
|
||||
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 */
|
||||
|
|
|
|||
Loading…
Reference in a new issue