diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 8340524..c820e2a 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -3815,6 +3815,20 @@
 //#define MBEDTLS_SSL_CONF_SINGLE_SIG_HASH_MD_ID
 //#define MBEDTLS_SSL_CONF_SINGLE_SIG_HASH_TLS_ID
 
+/* Set this to MBEDTLS_MD_INFO_{DIGEST} support of a single message
+ * digest at compile-time, at the benefit of code-size.
+ *
+ * On highly constrained systems with large control over the configuration of
+ * the connection endpoints, this option can be used to hardcode support for
+ * a single hash algorithm.
+ *
+ * You need to make sure that the corresponding digest algorithm attributes
+ * are defined through macros in md.c. See the definitions
+ * MBEDTLS_MD_INFO_SHA256_XXX for example.
+ *
+ */
+//#define MBEDTLS_MD_SINGLE_HASH MBEDTLS_MD_INFO_SHA256
+
 /* \} SECTION: Compile-time SSL configuration */
 
 /* Target and application specific configurations
diff --git a/include/mbedtls/md.h b/include/mbedtls/md.h
index c28ee1f..97d3b06 100644
--- a/include/mbedtls/md.h
+++ b/include/mbedtls/md.h
@@ -80,6 +80,8 @@
 #define MBEDTLS_MD_MAX_BLOCK_SIZE         64
 #endif
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
+
 /**
  * Opaque struct defined in md.c.
  */
@@ -89,6 +91,14 @@
 typedef struct mbedtls_md_info_t const * mbedtls_md_handle_t;
 #define MBEDTLS_MD_INVALID_HANDLE ( (mbedtls_md_handle_t) NULL )
 
+#else /* !MBEDTLS_MD_SINGLE_HASH */
+
+typedef int mbedtls_md_handle_t;
+#define MBEDTLS_MD_INVALID_HANDLE       ( (mbedtls_md_handle_t) 0 )
+#define MBEDTLS_MD_UNIQUE_VALID_HANDLE  ( (mbedtls_md_handle_t) 1 )
+
+#endif /* !MBEDTLS_MD_SINGLE_HASH */
+
 /**
  * The generic message-digest context.
  */
diff --git a/library/md.c b/library/md.c
index 2271a76..abc2ad3 100644
--- a/library/md.c
+++ b/library/md.c
@@ -148,6 +148,7 @@
 typedef int mbedtls_md_process_func_t( void *ctx,
                                           const unsigned char *input );
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 struct mbedtls_md_info_t
 {
     /** Digest identifier */
@@ -205,6 +206,8 @@
       MBEDTLS_MD_INFO_CLONE_FUNC( MD ),        \
       MBEDTLS_MD_INFO_PROCESS_FUNC( MD ) }
 
+#endif /* !MBEDTLS_MD_SINGLE_HASH */
+
 /*
  *
  * Definitions of MD information structures for various digests.
@@ -262,6 +265,7 @@
     return( mbedtls_internal_md2_process( (mbedtls_md2_context *) ctx ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 const mbedtls_md_info_t mbedtls_md2_info = {
     MBEDTLS_MD_MD2,
     "MD2",
@@ -276,6 +280,7 @@
     md2_clone_wrap,
     md2_process_wrap,
 };
+#endif /* !MBEDTLS_MD_SINGLE_HASH */
 
 #endif /* MBEDTLS_MD2_C */
 
@@ -328,6 +333,7 @@
     return( mbedtls_internal_md4_process( (mbedtls_md4_context *) ctx, data ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 const mbedtls_md_info_t mbedtls_md4_info = {
     MBEDTLS_MD_MD4,
     "MD4",
@@ -342,6 +348,7 @@
     md4_clone_wrap,
     md4_process_wrap,
 };
+#endif /* MBEDTLS_MD_SINGLE_HASH */
 
 #endif /* MBEDTLS_MD4_C */
 
@@ -394,6 +401,7 @@
     return( mbedtls_internal_md5_process( (mbedtls_md5_context *) ctx, data ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 const mbedtls_md_info_t mbedtls_md5_info = {
     MBEDTLS_MD_MD5,
     "MD5",
@@ -408,6 +416,7 @@
     md5_clone_wrap,
     md5_process_wrap,
 };
+#endif /* MBEDTLS_MD_SINGLE_HASH */
 
 #endif /* MBEDTLS_MD5_C */
 
@@ -463,6 +472,7 @@
                                 (mbedtls_ripemd160_context *) ctx, data ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 const mbedtls_md_info_t mbedtls_ripemd160_info = {
     MBEDTLS_MD_RIPEMD160,
     "RIPEMD160",
@@ -477,6 +487,7 @@
     ripemd160_clone_wrap,
     ripemd160_process_wrap,
 };
+#endif /* !MBEDTLS_MD_SINGLE_HASH */
 
 #endif /* MBEDTLS_RIPEMD160_C */
 
@@ -531,6 +542,7 @@
                                            data ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 const mbedtls_md_info_t mbedtls_sha1_info = {
     MBEDTLS_MD_SHA1,
     "SHA1",
@@ -545,6 +557,7 @@
     sha1_clone_wrap,
     sha1_process_wrap,
 };
+#endif /* !MBEDTLS_MD_SINGLE_HASH */
 
 #endif /* MBEDTLS_SHA1_C */
 
@@ -610,6 +623,7 @@
                                              data ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 #if !defined(MBEDTLS_SHA256_NO_SHA224)
 const mbedtls_md_info_t mbedtls_sha224_info = {
     MBEDTLS_MD_SHA224,
@@ -626,6 +640,7 @@
     sha224_process_wrap,
 };
 #endif /* !MBEDTLS_SHA256_NO_SHA224 */
+#endif /* !MBEDTLS_MD_SINGLE_HASH */
 
 static int sha256_starts_wrap( void *ctx )
 {
@@ -638,8 +653,10 @@
     return( mbedtls_sha256_ret( input, ilen, output, 0 ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 const mbedtls_md_info_t mbedtls_sha256_info =
     MBEDTLS_MD_INFO( MBEDTLS_MD_INFO_SHA256 );
+#endif /* !MBEDTLS_MD_SINGLE_HASH */
 
 #endif /* MBEDTLS_SHA256_C */
 
@@ -701,6 +718,7 @@
                                              data ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 const mbedtls_md_info_t mbedtls_sha384_info = {
     MBEDTLS_MD_SHA384,
     "SHA384",
@@ -715,6 +733,7 @@
     sha384_clone_wrap,
     sha384_process_wrap,
 };
+#endif /* MBEDTLS_MD_SINGLE_HASH */
 
 static int sha512_starts_wrap( void *ctx )
 {
@@ -727,6 +746,7 @@
     return( mbedtls_sha512_ret( input, ilen, output, 0 ) );
 }
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
 const mbedtls_md_info_t mbedtls_sha512_info = {
     MBEDTLS_MD_SHA512,
     "SHA512",
@@ -741,6 +761,7 @@
     sha384_clone_wrap,
     sha384_process_wrap,
 };
+#endif /* MBEDTLS_MD_SINGLE_HASH */
 
 #endif /* MBEDTLS_SHA512_C */
 
@@ -748,6 +769,8 @@
  * Getter functions for MD info structure.
  */
 
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
+
 static inline mbedtls_md_type_t mbedtls_md_info_type(
     mbedtls_md_handle_t info )
 {
@@ -820,6 +843,96 @@
     return( info->process_func );
 }
 
+#else /* !MBEDTLS_MD_SINGLE_HASH */
+
+static inline mbedtls_md_type_t mbedtls_md_info_type(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_TYPE( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline const char * mbedtls_md_info_name(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_NAME( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline int mbedtls_md_info_size(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_SIZE( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline int mbedtls_md_info_block_size(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_BLOCKSIZE( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline mbedtls_md_starts_func_t *mbedtls_md_info_starts_func(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_STARTS_FUNC( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline mbedtls_md_update_func_t *mbedtls_md_info_update_func(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_UPDATE_FUNC( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline mbedtls_md_finish_func_t *mbedtls_md_info_finish_func(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_FINISH_FUNC( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline mbedtls_md_digest_func_t *mbedtls_md_info_digest_func(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_DIGEST_FUNC( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline mbedtls_md_ctx_alloc_func_t *mbedtls_md_info_ctx_alloc_func(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_ALLOC_FUNC( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline mbedtls_md_ctx_free_func_t *mbedtls_md_info_ctx_free_func(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_FREE_FUNC( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline mbedtls_md_clone_func_t *mbedtls_md_info_clone_func(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_CLONE_FUNC( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+static inline mbedtls_md_process_func_t *mbedtls_md_info_process_func(
+    mbedtls_md_handle_t info )
+{
+    ((void) info);
+    return( MBEDTLS_MD_INFO_PROCESS_FUNC( MBEDTLS_MD_SINGLE_HASH ) );
+}
+
+#endif /* MBEDTLS_MD_SINGLE_HASH */
+
+#if !defined(MBEDTLS_MD_SINGLE_HASH)
+
 /*
  * Reminder: update profiles in x509_crt.c when adding a new hash!
  */
@@ -951,6 +1064,41 @@
     }
 }
 
+#else /* MBEDTLS_MD_SINGLE_HASH */
+
+const int *mbedtls_md_list( void )
+{
+    static int single_hash[2] =
+        { MBEDTLS_MD_INFO_TYPE( MBEDTLS_MD_SINGLE_HASH ),
+          MBEDTLS_MD_INVALID_HANDLE };
+
+    return( single_hash );
+}
+
+mbedtls_md_handle_t mbedtls_md_info_from_string( const char *md_name )
+{
+    static const char * const hash_name =
+        MBEDTLS_MD_INFO_NAME( MBEDTLS_MD_SINGLE_HASH );
+
+    if( md_name != NULL && strcmp( hash_name, md_name ) == 0 )
+        return( MBEDTLS_MD_UNIQUE_VALID_HANDLE );
+
+    return( MBEDTLS_MD_INVALID_HANDLE );
+}
+
+mbedtls_md_handle_t mbedtls_md_info_from_type( mbedtls_md_type_t md_type )
+{
+    static const mbedtls_md_type_t hash_type =
+        MBEDTLS_MD_INFO_TYPE( MBEDTLS_MD_SINGLE_HASH );
+
+    if( hash_type == md_type )
+        return( MBEDTLS_MD_UNIQUE_VALID_HANDLE );
+
+    return( MBEDTLS_MD_INVALID_HANDLE );
+}
+
+#endif /* MBEDTLS_MD_SINGLE_HASH */
+
 void mbedtls_md_init( mbedtls_md_context_t *ctx )
 {
     memset( ctx, 0, sizeof( mbedtls_md_context_t ) );
diff --git a/programs/ssl/query_config.c b/programs/ssl/query_config.c
index 627934f..c151d31 100644
--- a/programs/ssl/query_config.c
+++ b/programs/ssl/query_config.c
@@ -2906,6 +2906,14 @@
     }
 #endif /* MBEDTLS_SSL_CONF_SINGLE_SIG_HASH_TLS_ID */
 
+#if defined(MBEDTLS_MD_SINGLE_HASH)
+    if( strcmp( "MBEDTLS_MD_SINGLE_HASH", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_MD_SINGLE_HASH );
+        return( 0 );
+    }
+#endif /* MBEDTLS_MD_SINGLE_HASH */
+
     /* If the symbol is not found, return an error */
     return( 1 );
 }