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Introduce getter functions for MD info fields

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This commit continues the introduction of the MD digest implementation
abstraction layer given by `mbedtls_md_handle_t` by adding getter
functions returning the various properties of an implementation
(e.g. name, digest type, digest size). For the existing implementation,
these are just structure field accesses; however, in configurations
hardcoding the choice of a fixed digest algorithm, we'll be able to
implement them as inline functions returning compile-time constants.
This commit is contained in:
Hanno Becker
2019-07-17 14:10:26 +01:00
parent a5cedbcd3f
commit 530387eaa3
3 changed files with 185 additions and 54 deletions
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108
include/mbedtls/md_internal.h
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@@ -44,6 +44,21 @@ extern "C" {
* Message digest information.
* Allows message digest functions to be called in a generic way.
*/
typedef int mbedtls_md_starts_func_t( void *ctx );
typedef int mbedtls_md_update_func_t( void *ctx,
const unsigned char *input,
size_t ilen );
typedef int mbedtls_md_finish_func_t( void *ctx, unsigned char *output );
typedef int mbedtls_md_digest_func_t( const unsigned char *input,
size_t ilen,
unsigned char *output );
typedef void* mbedtls_md_ctx_alloc_func_t( void );
typedef void mbedtls_md_ctx_free_func_t( void *ctx );
typedef void mbedtls_md_clone_func_t( void *st, const void *src );
typedef int mbedtls_md_process_func_t( void *ctx,
const unsigned char *input );
struct mbedtls_md_info_t
{
/** Digest identifier */
@@ -59,31 +74,106 @@ struct mbedtls_md_info_t
int block_size;
/** Digest initialisation function */
int (*starts_func)( void *ctx );
mbedtls_md_starts_func_t *starts_func;
/** Digest update function */
int (*update_func)( void *ctx, const unsigned char *input, size_t ilen );
mbedtls_md_update_func_t *update_func;
/** Digest finalisation function */
int (*finish_func)( void *ctx, unsigned char *output );
mbedtls_md_finish_func_t *finish_func;
/** Generic digest function */
int (*digest_func)( const unsigned char *input, size_t ilen,
unsigned char *output );
mbedtls_md_digest_func_t *digest_func;
/** Allocate a new context */
void * (*ctx_alloc_func)( void );
mbedtls_md_ctx_alloc_func_t *ctx_alloc_func;
/** Free the given context */
void (*ctx_free_func)( void *ctx );
mbedtls_md_ctx_free_func_t *ctx_free_func;
/** Clone state from a context */
void (*clone_func)( void *dst, const void *src );
mbedtls_md_clone_func_t *clone_func;
/** Internal use only */
int (*process_func)( void *ctx, const unsigned char *input );
mbedtls_md_process_func_t *process_func;
};
/*
* Getter functions for MD info structure.
*/
static inline mbedtls_md_type_t mbedtls_md_info_type(
mbedtls_md_handle_t info )
{
return( info->type );
}
static inline const char * mbedtls_md_info_name(
mbedtls_md_handle_t info )
{
return( info->name );
}
static inline int mbedtls_md_info_size(
mbedtls_md_handle_t info )
{
return( info->size );
}
static inline int mbedtls_md_info_block_size(
mbedtls_md_handle_t info )
{
return( info->block_size );
}
static inline mbedtls_md_starts_func_t *mbedtls_md_info_starts_func(
mbedtls_md_handle_t info )
{
return( info->starts_func );
}
static inline mbedtls_md_update_func_t *mbedtls_md_info_update_func(
mbedtls_md_handle_t info )
{
return( info->update_func );
}
static inline mbedtls_md_finish_func_t *mbedtls_md_info_finish_func(
mbedtls_md_handle_t info )
{
return( info->finish_func );
}
static inline mbedtls_md_digest_func_t *mbedtls_md_info_digest_func(
mbedtls_md_handle_t info )
{
return( info->digest_func );
}
static inline mbedtls_md_ctx_alloc_func_t *mbedtls_md_info_ctx_alloc_func(
mbedtls_md_handle_t info )
{
return( info->ctx_alloc_func );
}
static inline mbedtls_md_ctx_free_func_t *mbedtls_md_info_ctx_free_func(
mbedtls_md_handle_t info )
{
return( info->ctx_free_func );
}
static inline mbedtls_md_clone_func_t *mbedtls_md_info_clone_func(
mbedtls_md_handle_t info )
{
return( info->clone_func );
}
static inline mbedtls_md_process_func_t *mbedtls_md_info_process_func(
mbedtls_md_handle_t info )
{
return( info->process_func );
}
#if defined(MBEDTLS_MD2_C)
extern const mbedtls_md_info_t mbedtls_md2_info;
#endif