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Implement static dispatch with SINGLE_PK_TYPE

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For optional functions, we introduce an extra macro to tell if the function is
omitted. As the C preprocessor doesn't directly support comparing strings,
testing if the _FUNC macro is defined to NULL isn't obvious. One could
probably play tricks to avoid the need for _OMIT macros, but the small amount
of (entirely local) duplication here is probably a lesser evil than extra
preprocessor complexity.
This commit is contained in:
Manuel Pégourié-Gonnard 2019-09-19 10:45:14 +02:00
parent 8cd288932b
commit 08620cbb62
2 changed files with 188 additions and 2 deletions
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18
include/mbedtls/pk_internal.h
View File

@ -41,6 +41,9 @@
* Each PK type that can be used with MBEDTLS_PK_SINGLE_TYPE needs to have
* the following MBEDTLS_PK_INFO_{FIELD} definitions, plus a dummy one for the
* base name. For now, only ECKEY with MBEDTLS_USE_TINYCRYPT is defined.
*
* For optional functions that are omitted, we need both the _FUNC field
* defined to NULL, and an extra macro _OMIT defined to 1.
*/
#if defined(MBEDTLS_USE_TINYCRYPT)
@ -54,11 +57,14 @@
#define MBEDTLS_PK_INFO_ECKEY_VERIFY_FUNC uecc_eckey_verify_wrap
#define MBEDTLS_PK_INFO_ECKEY_SIGN_FUNC uecc_eckey_sign_wrap
#define MBEDTLS_PK_INFO_ECKEY_DECRYPT_FUNC NULL
#define MBEDTLS_PK_INFO_ECKEY_DECRYPT_OMIT 1
#define MBEDTLS_PK_INFO_ECKEY_ENCRYPT_FUNC NULL
#define MBEDTLS_PK_INFO_ECKEY_ENCRYPT_OMIT 1
#define MBEDTLS_PK_INFO_ECKEY_CHECK_PAIR_FUNC uecc_eckey_check_pair
#define MBEDTLS_PK_INFO_ECKEY_CTX_ALLOC_FUNC uecc_eckey_alloc_wrap
#define MBEDTLS_PK_INFO_ECKEY_CTX_FREE_FUNC uecc_eckey_free_wrap
#define MBEDTLS_PK_INFO_ECKEY_DEBUG_FUNC NULL
#define MBEDTLS_PK_INFO_ECKEY_DEBUG_OMIT 1
#endif /* MBEDTLS_USE_TINYCRYPT */
/*
@ -69,13 +75,19 @@
#define MBEDTLS_PK_INFO_GET_BITLEN_T( PK ) PK ## _GET_BITLEN
#define MBEDTLS_PK_INFO_CAN_DO_T( PK ) PK ## _CAN_DO
#define MBEDTLS_PK_INFO_VERIFY_FUNC_T( PK ) PK ## _VERIFY_FUNC
#define MBEDTLS_PK_INFO_VERIFY_OMIT_T( PK ) PK ## _VERIFY_OMIT
#define MBEDTLS_PK_INFO_SIGN_FUNC_T( PK ) PK ## _SIGN_FUNC
#define MBEDTLS_PK_INFO_SIGN_OMIT_T( PK ) PK ## _SIGN_OMIT
#define MBEDTLS_PK_INFO_DECRYPT_FUNC_T( PK ) PK ## _DECRYPT_FUNC
#define MBEDTLS_PK_INFO_DECRYPT_OMIT_T( PK ) PK ## _DECRYPT_OMIT
#define MBEDTLS_PK_INFO_ENCRYPT_FUNC_T( PK ) PK ## _ENCRYPT_FUNC
#define MBEDTLS_PK_INFO_ENCRYPT_OMIT_T( PK ) PK ## _ENCRYPT_OMIT
#define MBEDTLS_PK_INFO_CHECK_PAIR_FUNC_T( PK ) PK ## _CHECK_PAIR_FUNC
#define MBEDTLS_PK_INFO_CHECK_PAIR_OMIT_T( PK ) PK ## _CHECK_PAIR_OMIT
#define MBEDTLS_PK_INFO_CTX_ALLOC_FUNC_T( PK ) PK ## _CTX_ALLOC_FUNC
#define MBEDTLS_PK_INFO_CTX_FREE_FUNC_T( PK ) PK ## _CTX_FREE_FUNC
#define MBEDTLS_PK_INFO_DEBUG_FUNC_T( PK ) PK ## _DEBUG_FUNC
#define MBEDTLS_PK_INFO_DEBUG_OMIT_T( PK ) PK ## _DEBUG_OMIT
/* Wrappers around MBEDTLS_PK_INFO_{FIELD}_T() which makes sure that
* the argument is macro-expanded before concatenated with the
@ -87,13 +99,19 @@
#define MBEDTLS_PK_INFO_GET_BITLEN( PK ) MBEDTLS_PK_INFO_GET_BITLEN_T( PK )
#define MBEDTLS_PK_INFO_CAN_DO( PK ) MBEDTLS_PK_INFO_CAN_DO_T( PK )
#define MBEDTLS_PK_INFO_VERIFY_FUNC( PK ) MBEDTLS_PK_INFO_VERIFY_FUNC_T( PK )
#define MBEDTLS_PK_INFO_VERIFY_OMIT( PK ) MBEDTLS_PK_INFO_VERIFY_OMIT_T( PK )
#define MBEDTLS_PK_INFO_SIGN_FUNC( PK ) MBEDTLS_PK_INFO_SIGN_FUNC_T( PK )
#define MBEDTLS_PK_INFO_SIGN_OMIT( PK ) MBEDTLS_PK_INFO_SIGN_OMIT_T( PK )
#define MBEDTLS_PK_INFO_DECRYPT_FUNC( PK ) MBEDTLS_PK_INFO_DECRYPT_FUNC_T( PK )
#define MBEDTLS_PK_INFO_DECRYPT_OMIT( PK ) MBEDTLS_PK_INFO_DECRYPT_OMIT_T( PK )
#define MBEDTLS_PK_INFO_ENCRYPT_FUNC( PK ) MBEDTLS_PK_INFO_ENCRYPT_FUNC_T( PK )
#define MBEDTLS_PK_INFO_ENCRYPT_OMIT( PK ) MBEDTLS_PK_INFO_ENCRYPT_OMIT_T( PK )
#define MBEDTLS_PK_INFO_CHECK_PAIR_FUNC( PK ) MBEDTLS_PK_INFO_CHECK_PAIR_FUNC_T( PK )
#define MBEDTLS_PK_INFO_CHECK_PAIR_OMIT( PK ) MBEDTLS_PK_INFO_CHECK_PAIR_OMIT_T( PK )
#define MBEDTLS_PK_INFO_CTX_ALLOC_FUNC( PK ) MBEDTLS_PK_INFO_CTX_ALLOC_FUNC_T( PK )
#define MBEDTLS_PK_INFO_CTX_FREE_FUNC( PK ) MBEDTLS_PK_INFO_CTX_FREE_FUNC_T( PK )
#define MBEDTLS_PK_INFO_DEBUG_FUNC( PK ) MBEDTLS_PK_INFO_DEBUG_FUNC_T( PK )
#define MBEDTLS_PK_INFO_DEBUG_OMIT( PK ) MBEDTLS_PK_INFO_DEBUG_OMIT_T( PK )
struct mbedtls_pk_info_t
{

172
library/pk.c
View File

@ -1001,8 +1001,9 @@ const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
/*
* Access to members of the pk_info structure. These are meant to be replaced
* by zero-runtime-cost accessors when a single PK type is hardcoded.
* Access to members of the pk_info structure. When a single PK type is
* hardcoded, these should have zero runtime cost; otherwise, the usual
* dynamic dispatch based on pk_info is used.
*
* For function members, don't make a getter, but a function that directly
* calls the method, so that we can entirely get rid of function pointers
@ -1012,6 +1013,171 @@ const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
* MBEDTLS_ECP_RESTARTABLE for now, as the main target for hardcoded is builds
* with MBEDTLS_USE_TINYCRYPT, which don't have MBEDTLS_ECP_RESTARTABLE.
*/
#if defined(MBEDTLS_PK_SINGLE_TYPE)
MBEDTLS_ALWAYS_INLINE static inline mbedtls_pk_type_t pk_info_type(
const mbedtls_pk_info_t *info )
{
(void) info;
return( MBEDTLS_PK_INFO_TYPE( MBEDTLS_PK_SINGLE_TYPE ) );
}
MBEDTLS_ALWAYS_INLINE static inline const char * pk_info_name(
const mbedtls_pk_info_t *info )
{
(void) info;
return( MBEDTLS_PK_INFO_NAME( MBEDTLS_PK_SINGLE_TYPE ) );
}
MBEDTLS_ALWAYS_INLINE static inline size_t pk_info_get_bitlen(
const mbedtls_pk_info_t *info, const void *ctx )
{
(void) info;
return( MBEDTLS_PK_INFO_GET_BITLEN( MBEDTLS_PK_SINGLE_TYPE )( ctx ) );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_can_do(
const mbedtls_pk_info_t *info, mbedtls_pk_type_t type )
{
(void) info;
return( MBEDTLS_PK_INFO_CAN_DO( MBEDTLS_PK_SINGLE_TYPE )( type ) );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_verify_func(
const mbedtls_pk_info_t *info, void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
(void) info;
#if MBEDTLS_PK_INFO_VERIFY_OMIT( MBEDTLS_PK_SINGLE_TYPE )
(void) ctx;
(void) md_alg;
(void) hash;
(void) hash_len;
(void) sig;
(void) sig_len;
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
#else
return( MBEDTLS_PK_INFO_VERIFY_FUNC( MBEDTLS_PK_SINGLE_TYPE )(
ctx, md_alg, hash, hash_len, sig, sig_len ) );
#endif
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_sign_func(
const mbedtls_pk_info_t *info, void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
(void) info;
#if MBEDTLS_PK_INFO_SIGN_OMIT( MBEDTLS_PK_SINGLE_TYPE )
(void) ctx;
(void) md_alg;
(void) hash;
(void) hash_len;
(void) sig;
(void) sig_len;
(void) f_rng;
(void) p_rng;
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
#else
return( MBEDTLS_PK_INFO_SIGN_FUNC( MBEDTLS_PK_SINGLE_TYPE )(
ctx, md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) );
#endif
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_decrypt_func(
const mbedtls_pk_info_t *info, void *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
(void) info;
#if MBEDTLS_PK_INFO_DECRYPT_OMIT( MBEDTLS_PK_SINGLE_TYPE )
(void) ctx;
(void) input;
(void) ilen;
(void) output;
(void) olen;
(void) osize;
(void) f_rng;
(void) p_rng;
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
#else
return( MBEDTLS_PK_INFO_DECRYPT_FUNC( MBEDTLS_PK_SINGLE_TYPE )(
ctx, input, ilen, output, olen, osize, f_rng, p_rng ) );
#endif
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_encrypt_func(
const mbedtls_pk_info_t *info, void *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
(void) info;
#if MBEDTLS_PK_INFO_ENCRYPT_OMIT( MBEDTLS_PK_SINGLE_TYPE )
(void) ctx;
(void) input;
(void) ilen;
(void) output;
(void) olen;
(void) osize;
(void) f_rng;
(void) p_rng;
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
#else
return( MBEDTLS_PK_INFO_ENCRYPT_FUNC( MBEDTLS_PK_SINGLE_TYPE )(
ctx, input, ilen, output, olen, osize, f_rng, p_rng ) );
#endif
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_check_pair_func(
const mbedtls_pk_info_t *info, const void *pub, const void *prv )
{
(void) info;
#if MBEDTLS_PK_INFO_CHECK_PAIR_OMIT( MBEDTLS_PK_SINGLE_TYPE )
(void) pub;
(void) prv;
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#else
return( MBEDTLS_PK_INFO_CHECK_PAIR_FUNC( MBEDTLS_PK_SINGLE_TYPE )(
pub, prv ) );
#endif
}
MBEDTLS_ALWAYS_INLINE static inline void *pk_info_ctx_alloc_func(
const mbedtls_pk_info_t *info )
{
(void) info;
return( MBEDTLS_PK_INFO_CTX_ALLOC_FUNC( MBEDTLS_PK_SINGLE_TYPE )( ) );
}
MBEDTLS_ALWAYS_INLINE static inline void pk_info_ctx_free_func(
const mbedtls_pk_info_t *info, void *ctx )
{
(void) info;
MBEDTLS_PK_INFO_CTX_FREE_FUNC( MBEDTLS_PK_SINGLE_TYPE )( ctx );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_debug_func(
const mbedtls_pk_info_t *info,
const void *ctx, mbedtls_pk_debug_item *items )
{
(void) info;
#if MBEDTLS_PK_INFO_DEBUG_OMIT( MBEDTLS_PK_SINGLE_TYPE )
(void) ctx;
(void) items;
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
#else
return( MBEDTLS_PK_INFO_DEBUG_FUNC( MBEDTLS_PK_SINGLE_TYPE )( ctx, items ) );
#endif
}
#else /* MBEDTLS_PK_SINGLE_TYPE */
MBEDTLS_ALWAYS_INLINE static inline mbedtls_pk_type_t pk_info_type(
const mbedtls_pk_info_t *info )
@ -1122,6 +1288,8 @@ MBEDTLS_ALWAYS_INLINE static inline int pk_info_debug_func(
return( 0 );
}
#endif /* MBEDTLS_PK_SINGLE_TYPE */
/*
* Initialise a mbedtls_pk_context
*/