Use hash transform function return type for passing burn stack depth

* cipher/gostr4311-94.c (transform): Return stack burn depth.
* cipher/hash-common.c (_gcry_md_block_write): Use stack burn depth
returned by 'hd->bwrite'.
* cipher/hash-common.h (_gcry_md_block_write_t): Change return type to
'unsigned int'.
(gry_md_block_ctx_t): Remove 'stack_burn'.
* cipher/md4.c (transform): Return stack burn depth.
(md4_final): Use stack burn depth from transform.
* cipher/md5.c (transform): Return stack burn depth.
(md5_final): Use stack burn depth from transform.
* cipher/rmd160.c (transform): Return stack burn depth.
(rmd160_final): Use stack burn depth from transform.
* cipher/sha1.c (transform): Return stack burn depth.
(sha1_final): Use stack burn depth from transform.
* cipher/sha256.c (transform): Return stack burn depth.
(sha256_final): Use stack burn depth from transform.
* cipher/sha512.c (__transform, transform): Return stack burn depth.
(sha512_final): Use stack burn depth from transform.
* cipher/stribog.c (transform64): Return stack burn depth.
* cipher/tiger.c (transform): Return stack burn depth.
(tiger_final): Use stack burn depth from transform.
--

Transform function might want different depth of stack burn depending on
detected CPU features (like in SHA-512 on ARM with NEON). So return
stack burn depth from transform functions as a request or a hint to
calling function.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>

1 files changed, 5 insertions, 4 deletions

diff --git a/cipher/gostr3411-94.c b/cipher/gostr3411-94.c
index 93bf5973..bfd52bd8 100644
--- a/cipher/gostr3411-94.c
+++ b/cipher/gostr3411-94.c
@@ -38,7 +38,7 @@ typedef struct {
   u32 len;
 } GOSTR3411_CONTEXT;
 
-static void
+static unsigned int
 transform (void *c, const unsigned char *data);
 
 static void
@@ -53,8 +53,6 @@ gost3411_init (void *context)
   hd->bctx.nblocks = 0;
   hd->bctx.count = 0;
   hd->bctx.blocksize = 32;
-  /* FIXME: Fix this arbitrary value for the stack_burn size.  -wk */
-  hd->bctx.stack_burn = 200;
   hd->bctx.bwrite = transform;
 }
 
@@ -203,7 +201,7 @@ do_hash_step (GOST28147_context *hd, unsigned char *h, unsigned char *m)
 }
 
 
-static void
+static unsigned int
 transform (void *ctx, const unsigned char *data)
 {
   GOSTR3411_CONTEXT *hd = ctx;
@@ -212,6 +210,9 @@ transform (void *ctx, const unsigned char *data)
   memcpy (m, data, 32);
   do_hash_step (&hd->hd, hd->h, m);
   do_add (hd->sigma, m);
+
+/* FIXME: Fix this arbitrary value for the stack_burn size.  -wk */
+  return /* stack_burn */ 200;
 }
 
 /*