Separate common md block code

* cipher/hash-common.c (_gcry_md_block_write): New function to handle
block md operations.  The current implementation is limited to 64 byte
buffer and u32 block counter.

* cipher/md4.c, cipher/md5.c, cipher/rmd.h, cipher/rmd160.c
*cipher/sha1.c, cipher/sha256.c, cipher/tiger.c: Convert to use
_gcry_md_block_write.
--

Whirlpool and SHA512 are left as before, as SHA512 uses 128 bytes buffer
and u64 blocks counter and Whirlpool does not have trivial block handling
structure.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

Indentation changes, minor edits and adjustment of
_gcry_sha1_hash_buffers by wk.

1 files changed, 16 insertions, 3 deletions

diff --git a/cipher/hash-common.h b/cipher/hash-common.h
index fdebef42..1d1d4ec5 100644
--- a/cipher/hash-common.h
+++ b/cipher/hash-common.h
@@ -26,8 +26,21 @@ const char * _gcry_hash_selftest_check_one
               int datamode, const void *data, size_t datalen,
               const void *expect, size_t expectlen);
 
-
-
-
+/* Type for the md_write helper function.  */
+typedef void (*_gcry_md_block_write_t) (void *c, const unsigned char *buf);
+
+typedef struct gcry_md_block_ctx
+{
+    u32  nblocks;
+    int  count;
+    byte buf[64];
+    size_t blocksize;
+    _gcry_md_block_write_t bwrite;
+    size_t stack_burn;
+} gcry_md_block_ctx_t;
+
+
+void
+_gcry_md_block_write( void *context, const void *inbuf_arg, size_t inlen);
 
 #endif /*GCRY_HASH_COMMON_H*/