crypto: hash - Added scatter list walking helper

This patch adds the walking helpers for hash algorithms akin to
those of block ciphers.  This is a necessary step before we can
reimplement existing hash algorithms using the new ahash interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 131 insertions, 1 deletions

diff --git a/crypto/ahash.c b/crypto/ahash.c
index e6e5906ca80a..27128f2c687a 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -13,7 +13,8 @@
  *
  */
 
-#include <crypto/algapi.h>
+#include <crypto/internal/hash.h>
+#include <crypto/scatterwalk.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -23,6 +24,94 @@
 
 #include "internal.h"
 
+static int hash_walk_next(struct crypto_hash_walk *walk)
+{
+        unsigned int alignmask = walk->alignmask;
+        unsigned int offset = walk->offset;
+        unsigned int nbytes = min(walk->entrylen,
+                                  ((unsigned int)(PAGE_SIZE)) - offset);
+
+        walk->data = crypto_kmap(walk->pg, 0);
+        walk->data += offset;
+
+        if (offset & alignmask)
+                nbytes = alignmask + 1 - (offset & alignmask);
+
+        walk->entrylen -= nbytes;
+        return nbytes;
+}
+
+static int hash_walk_new_entry(struct crypto_hash_walk *walk)
+{
+        struct scatterlist *sg;
+
+        sg = walk->sg;
+        walk->pg = sg_page(sg);
+        walk->offset = sg->offset;
+        walk->entrylen = sg->length;
+
+        if (walk->entrylen > walk->total)
+                walk->entrylen = walk->total;
+        walk->total -= walk->entrylen;
+
+        return hash_walk_next(walk);
+}
+
+int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
+{
+        unsigned int alignmask = walk->alignmask;
+        unsigned int nbytes = walk->entrylen;
+
+        walk->data -= walk->offset;
+
+        if (nbytes && walk->offset & alignmask && !err) {
+                walk->offset += alignmask - 1;
+                walk->offset = ALIGN(walk->offset, alignmask + 1);
+                walk->data += walk->offset;
+
+                nbytes = min(nbytes,
+                             ((unsigned int)(PAGE_SIZE)) - walk->offset);
+                walk->entrylen -= nbytes;
+
+                return nbytes;
+        }
+
+        crypto_kunmap(walk->data, 0);
+        crypto_yield(walk->flags);
+
+        if (err)
+                return err;
+
+        walk->offset = 0;
+
+        if (nbytes)
+                return hash_walk_next(walk);
+
+        if (!walk->total)
+                return 0;
+
+        walk->sg = scatterwalk_sg_next(walk->sg);
+
+        return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
+
+int crypto_hash_walk_first(struct ahash_request *req,
+                           struct crypto_hash_walk *walk)
+{
+        walk->total = req->nbytes;
+
+        if (!walk->total)
+                return 0;
+
+        walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
+        walk->sg = req->src;
+        walk->flags = req->base.flags;
+
+        return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
+
 static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
                                 unsigned int keylen)
 {
diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
new file mode 100644
index 000000000000..93ac42280221
--- /dev/null
+++ b/include/crypto/internal/hash.h
@@ -0,0 +1,41 @@
+/*
+ * Hash algorithms.
+ * 
+ * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ */
+
+#ifndef _CRYPTO_INTERNAL_HASH_H
+#define _CRYPTO_INTERNAL_HASH_H
+
+#include <crypto/algapi.h>
+
+struct ahash_request;
+struct scatterlist;
+
+struct crypto_hash_walk {
+        char *data;
+
+        unsigned int offset;
+        unsigned int alignmask;
+
+        struct page *pg;
+        unsigned int entrylen;
+
+        unsigned int total;
+        struct scatterlist *sg;
+
+        unsigned int flags;
+};
+
+int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err);
+int crypto_hash_walk_first(struct ahash_request *req,
+                           struct crypto_hash_walk *walk);
+
+#endif  /* _CRYPTO_INTERNAL_HASH_H */
+