Fixup: Don't assume that alt SHA256 impln's have trivial init/free
diff --git a/include/mbedtls/md_internal.h b/include/mbedtls/md_internal.h
index 87f7837..84944ee 100644
--- a/include/mbedtls/md_internal.h
+++ b/include/mbedtls/md_internal.h
@@ -86,14 +86,14 @@
}
#define MBEDTLS_MD_INFO_SHA256_TYPE MBEDTLS_MD_SHA256
#define MBEDTLS_MD_INFO_SHA256_CTX_TYPE mbedtls_sha256_context
-#if defined(MBEDTLS_MD_SINGLE_HASH)
+#if defined(MBEDTLS_MD_SINGLE_HASH) && !defined(MBEDTLS_SHA256_ALT)
/* mbedtls_md_sha256_init() only zeroizes, which is redundant
* because mbedtls_md_context is zeroized in mbedtls_md_init(),
* and the mbedtls_sha256_context is embedded in mbedtls_md_context_t. */
#define MBEDTLS_MD_INFO_SHA256_INIT_FUNC mbedtls_md_sha256_init_free_dummy
#else
#define MBEDTLS_MD_INFO_SHA256_INIT_FUNC mbedtls_sha256_init
-#endif /* MBEDTLS_MD_SINGLE_HASH */
+#endif /* MBEDTLS_MD_SINGLE_HASH && !MBEDTLS_SHA256_ALT */
#define MBEDTLS_MD_INFO_SHA256_NAME "SHA256"
#define MBEDTLS_MD_INFO_SHA256_SIZE 32
#define MBEDTLS_MD_INFO_SHA256_BLOCKSIZE 64
@@ -102,14 +102,14 @@
#define MBEDTLS_MD_INFO_SHA256_FINISH_FUNC mbedtls_sha224_finish_wrap
#define MBEDTLS_MD_INFO_SHA256_DIGEST_FUNC mbedtls_sha256_wrap
#define MBEDTLS_MD_INFO_SHA256_ALLOC_FUNC mbedtls_sha224_ctx_alloc
-#if defined(MBEDTLS_MD_SINGLE_HASH)
+#if defined(MBEDTLS_MD_SINGLE_HASH) && !defined(MBEDTLS_SHA256_ALT)
/* mbedtls_md_sha256_free() only zeroizes, which is redundant
* because mbedtls_md_context is zeroized in mbedtls_md_init(),
* and the mbedtls_sha256_context is embedded in mbedtls_md_context_t. */
#define MBEDTLS_MD_INFO_SHA256_FREE_FUNC mbedtls_md_sha256_init_free_dummy
#else
#define MBEDTLS_MD_INFO_SHA256_FREE_FUNC mbedtls_sha224_ctx_free
-#endif /* MBEDTLS_MD_SINGLE_HASH */
+#endif /* MBEDTLS_MD_SINGLE_HASH && !MBEDTLS_SHA256_ALT */
#define MBEDTLS_MD_INFO_SHA256_CLONE_FUNC mbedtls_sha224_clone_wrap
#define MBEDTLS_MD_INFO_SHA256_PROCESS_FUNC mbedtls_sha224_process_wrap