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MD: Embed digest context structure into MD wrapper context

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This commit is contained in:
Hanno Becker 2019-09-05 13:02:52 +01:00
parent 4a99765f94
commit 52e36bc1a1
2 changed files with 21 additions and 3 deletions
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13
include/mbedtls/md.h
View file

@ -108,6 +108,8 @@ typedef int mbedtls_md_handle_t;
#endif /* !MBEDTLS_MD_SINGLE_HASH */
#include "md_internal.h"
/**
* The generic message-digest context.
*/
@ -118,11 +120,20 @@ typedef struct mbedtls_md_context_t
mbedtls_md_handle_t md_info;
#endif
#if !defined(MBEDTLS_MD_SINGLE_HASH)
/** The digest-specific context. */
void *md_ctx;
/** The HMAC part of the context. */
void *hmac_ctx;
#else
unsigned char md_ctx[ sizeof( MBEDTLS_MD_INFO_CTX_TYPE(
MBEDTLS_MD_SINGLE_HASH ) ) ];
unsigned char hmac_ctx[ 2 * MBEDTLS_MD_INFO_BLOCKSIZE(
MBEDTLS_MD_SINGLE_HASH ) ];
#endif /* MBEDTLS_MD_SINGLE_HASH */
} mbedtls_md_context_t;
#if !defined(MBEDTLS_MD_SINGLE_HASH)
@ -140,8 +151,6 @@ static inline mbedtls_md_handle_t mbedtls_md_get_handle(
}
#endif /* !MBEDTLS_MD_SINGLE_HASH */
#include "md_internal.h"
/**
* \brief This function returns the list of digests supported by the
* generic digest module.

11
library/md.c
View file

@ -388,6 +388,11 @@ mbedtls_md_handle_t mbedtls_md_info_from_type( mbedtls_md_type_t md_type )
void mbedtls_md_init( mbedtls_md_context_t *ctx )
{
memset( ctx, 0, sizeof( mbedtls_md_context_t ) );
#if defined(MBEDTLS_MD_SINGLE_HASH)
mbedtls_md_info_init( mbedtls_md_get_handle( ctx ),
ctx->md_ctx );
#endif
}
void mbedtls_md_free( mbedtls_md_context_t *ctx )
@ -395,6 +400,7 @@ void mbedtls_md_free( mbedtls_md_context_t *ctx )
if( ctx == NULL || mbedtls_md_get_handle( ctx ) == MBEDTLS_MD_INVALID_HANDLE )
return;
#if !defined(MBEDTLS_MD_SINGLE_HASH)
if( ctx->md_ctx != NULL )
{
mbedtls_md_info_ctx_free( mbedtls_md_get_handle( ctx ), ctx->md_ctx );
@ -406,6 +412,7 @@ void mbedtls_md_free( mbedtls_md_context_t *ctx )
2 * mbedtls_md_info_block_size( mbedtls_md_get_handle( ctx ) ) );
mbedtls_free( ctx->hmac_ctx );
}
#endif /* MBEDTLS_MD_SINGLE_HASH */
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_md_context_t ) );
}
@ -437,6 +444,7 @@ int mbedtls_md_setup( mbedtls_md_context_t *ctx, mbedtls_md_handle_t md_info, in
if( md_info == MBEDTLS_MD_INVALID_HANDLE || ctx == NULL )
return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
#if !defined(MBEDTLS_MD_SINGLE_HASH)
ctx->md_ctx = mbedtls_md_info_ctx_alloc( md_info );
if( ctx->md_ctx == NULL )
return( MBEDTLS_ERR_MD_ALLOC_FAILED );
@ -452,8 +460,9 @@ int mbedtls_md_setup( mbedtls_md_context_t *ctx, mbedtls_md_handle_t md_info, in
}
}
#if !defined(MBEDTLS_MD_SINGLE_HASH)
ctx->md_info = md_info;
#else
((void) hmac);
#endif
return( 0 );