2.6.24

 crypto

diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
new file mode 100644
index 0000000..68c62f5
--- /dev/null
+++ b/crypto/sha1_generic.c
@@ -0,0 +1,139 @@
+/*
+ * Cryptographic API.
+ *
+ * SHA1 Secure Hash Algorithm.
+ *
+ * Derived from cryptoapi implementation, adapted for in-place
+ * scatterlist interface.
+ *
+ * Copyright (c) Alan Smithee.
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
+ *
+ * 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.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/crypto.h>
+#include <linux/cryptohash.h>
+#include <linux/types.h>
+#include <crypto/sha.h>
+#include <asm/byteorder.h>
+
+struct sha1_ctx {
+        u64 count;
+        u32 state[5];
+        u8 buffer[64];
+};
+
+static void sha1_init(struct crypto_tfm *tfm)
+{
+   struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+   static const struct sha1_ctx initstate = {
+     0,
+     { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
+     { 0, }
+   };
+
+   *sctx = initstate;
+}
+
+static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
+         unsigned int len)
+{
+   struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+   unsigned int partial, done;
+   const u8 *src;
+
+   partial = sctx->count & 0x3f;
+   sctx->count += len;
+   done = 0;
+   src = data;
+
+   if ((partial + len) > 63) {
+      u32 temp[SHA_WORKSPACE_WORDS];
+
+      if (partial) {
+         done = -partial;
+         memcpy(sctx->buffer + partial, data, done + 64);
+         src = sctx->buffer;
+      }
+
+      do {
+         sha_transform(sctx->state, src, temp);
+         done += 64;
+         src = data + done;
+      } while (done + 63 < len);
+
+      memset(temp, 0, sizeof(temp));
+      partial = 0;
+   }
+   memcpy(sctx->buffer + partial, src, len - done);
+}
+
+
+/* Add padding and return the message digest. */
+static void sha1_final(struct crypto_tfm *tfm, u8 *out)
+{
+   struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+   __be32 *dst = (__be32 *)out;
+   u32 i, index, padlen;
+   __be64 bits;
+   static const u8 padding[64] = { 0x80, };
+
+   bits = cpu_to_be64(sctx->count << 3);
+
+   /* Pad out to 56 mod 64 */
+   index = sctx->count & 0x3f;
+   padlen = (index < 56) ? (56 - index) : ((64+56) - index);
+   sha1_update(tfm, padding, padlen);
+
+   /* Append length */
+   sha1_update(tfm, (const u8 *)&bits, sizeof(bits));
+
+   /* Store state in digest */
+   for (i = 0; i < 5; i++)
+      dst[i] = cpu_to_be32(sctx->state[i]);
+
+   /* Wipe context */
+   memset(sctx, 0, sizeof *sctx);
+}
+
+static struct crypto_alg alg = {
+   .cra_name   =   "sha1",
+   .cra_driver_name=   "sha1-generic",
+   .cra_flags   =   CRYPTO_ALG_TYPE_DIGEST,
+   .cra_blocksize   =   SHA1_BLOCK_SIZE,
+   .cra_ctxsize   =   sizeof(struct sha1_ctx),
+   .cra_module   =   THIS_MODULE,
+   .cra_alignmask   =   3,
+   .cra_list       =       LIST_HEAD_INIT(alg.cra_list),
+   .cra_u      =   { .digest = {
+   .dia_digestsize   =   SHA1_DIGEST_SIZE,
+   .dia_init      =    sha1_init,
+   .dia_update    =   sha1_update,
+   .dia_final     =   sha1_final } }
+};
+
+static int __init init(void)
+{
+   return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+   crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
+
+MODULE_ALIAS("sha1");