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Add fields for PSA-based ECDHE to handshake structure

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This is the first in a series of commits adding client-side
support for PSA-based ECDHE.

Previously, the state of an ECDHE key agreement was maintained
in the field mbedtls_ssl_handshake_params::ecdh_ctx, of type
::mbedtls_ecdh_context and manipulated through the ECDH API.

The ECDH API will be superseeded by the PSA Crypto API for key
agreement, which needs the following data:
(a) A raw buffer holding the public part of the key agreement
    received from our peer.
(b) A key slot holding the private part of the key agreement.
(c) The algorithm to use.
The commit adds fields to ::mbedtls_ssl_handshake_params
representing these three inputs to PSA-based key agreement.

Specifically, it adds a field for the key slot holding the
ECDH private key, a field for the EC curve identifier, and
a buffer holding the peer's public key.

Note: Storing the peer's public key buffer is slightly
inefficient, as one could perform the ECDH computation
as soon as the peer sends its public key, either working
with in-place or using a stack-buffer to reformat the
public key before passing it to PSA. This optimization
is left for a later commit.
This commit is contained in:
Hanno Becker 2019-02-18 16:41:55 +00:00
parent f75f912c31
commit df51dbe17f
2 changed files with 16 additions and 1 deletions
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2
include/mbedtls/psa_util.h
View file

@ -235,6 +235,8 @@ static inline int mbedtls_psa_get_ecc_oid_from_id(
return( -1 ); return( -1 );
} }
#define MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH 256
static inline psa_ecc_curve_t mbedtls_psa_translate_ecc_group( mbedtls_ecp_group_id grpid ) static inline psa_ecc_curve_t mbedtls_psa_translate_ecc_group( mbedtls_ecp_group_id grpid )
{ {
switch( grpid ) switch( grpid )

15
include/mbedtls/ssl_internal.h
View file

@ -57,6 +57,11 @@
#include "ecjpake.h" #include "ecjpake.h"
#endif #endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa/crypto.h"
#include "psa_util.h"
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \ #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
!defined(inline) && !defined(__cplusplus) !defined(inline) && !defined(__cplusplus)
#define inline __inline #define inline __inline
@ -280,7 +285,15 @@ struct mbedtls_ssl_handshake_params
#endif #endif
#if defined(MBEDTLS_ECDH_C) #if defined(MBEDTLS_ECDH_C)
mbedtls_ecdh_context ecdh_ctx; /*!< ECDH key exchange */ mbedtls_ecdh_context ecdh_ctx; /*!< ECDH key exchange */
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_ecc_curve_t ecdh_psa_curve;
psa_key_handle_t ecdh_psa_privkey;
unsigned char ecdh_psa_peerkey[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
size_t ecdh_psa_peerkey_len;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#endif /* MBEDTLS_ECDH_C */
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
mbedtls_ecjpake_context ecjpake_ctx; /*!< EC J-PAKE key exchange */ mbedtls_ecjpake_context ecjpake_ctx; /*!< EC J-PAKE key exchange */
#if defined(MBEDTLS_SSL_CLI_C) #if defined(MBEDTLS_SSL_CLI_C)