md: Add function gcry_md_hash_buffers.

* src/gcrypt.h.in (gcry_buffer_t): new.
(gcry_md_hash_buffers): New.
* src/visibility.c, src/visibility.h: Add wrapper for new function.
* src/libgcrypt.def, src/libgcrypt.vers: Export new function.
* cipher/md.c (gcry_md_hash_buffers): New.
* cipher/sha1.c (_gcry_sha1_hash_buffers): New.
* tests/basic.c (check_one_md_multi): New.
(check_digests): Run that test.
* tests/hmac.c (check_hmac_multi): New.
(main): Run that test.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/cipher/sha1.c b/cipher/sha1.c
index 4b784acf..c29f4880 100644
--- a/cipher/sha1.c
+++ b/cipher/sha1.c
@@ -373,6 +373,20 @@ _gcry_sha1_hash_buffer (void *outbuf, const void *buffer, size_t length)
 }
 
 
+/* Variant of the above shortcut function using a multiple buffers.  */
+void
+_gcry_sha1_hash_buffers (void *outbuf, const gcry_buffer_t *iov, int iovcnt)
+{
+  SHA1_CONTEXT hd;
+
+  sha1_init (&hd);
+  for (;iovcnt > 0; iov++, iovcnt--)
+    sha1_write (&hd, (const char*)iov[0].data + iov[0].off, iov[0].len);
+  sha1_final (&hd);
+  memcpy (outbuf, hd.buf, 20);
+}
+
+
 
 /*
      Self-test section.