configure.ac: generate version number from git commit and tags

[wimlib] / src / sha1.c

diff --git a/src/sha1.c b/src/sha1.c
index 9ed26fd1ebe418d36eb3f9373d4baaf255cc0139..d15325063d92b6e047ccfb438a7b683d4fb056ab 100644 (file)
--- a/src/sha1.c
+++ b/src/sha1.c
@@ -1,15 +1,21 @@
 /*
- * sha1.c
+ * sha1.c - implementation of the Secure Hash Algorithm version 1 (FIPS 180-1)
  *
- * Implementation of the Secure Hash Algorithm version 1 (FIPS 180-1).
+ * The following copying information applies to this specific source code file:
  *
- * Author:  Eric Biggers
- * Year:    2014
+ * Written in 2014-2015 by Eric Biggers <ebiggers3@gmail.com>
  *
- * The default SHA-1 transform is based on public domain code by Steve Reid.
+ * To the extent possible under law, the author(s) have dedicated all copyright
+ * and related and neighboring rights to this software to the public domain
+ * worldwide via the Creative Commons Zero 1.0 Universal Public Domain
+ * Dedication (the "CC0").
  *
- * The author dedicates this file to the public domain.
- * You can do whatever you want with this file.
+ * This software is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the CC0 for more details.
+ *
+ * You should have received a copy of the CC0 along with this software; if not
+ * see <http://creativecommons.org/publicdomain/zero/1.0/>.
  */
 
 #ifdef HAVE_CONFIG_H
@@ -18,6 +24,7 @@
 
 #include "wimlib/endianness.h"
 #include "wimlib/sha1.h"
+#include "wimlib/unaligned.h"
 
 /* Dummy SHA-1 message digest of all 0's.  This is used in the WIM format to
  * mean "SHA-1 not specified".  */
@@ -50,7 +57,7 @@ sprint_hash(const u8 hash[SHA1_HASH_SIZE], tchar strbuf[SHA1_HASH_SIZE * 2 + 1])
 
 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
 
-#define blk0(i) (tmp[i] = be32_to_cpu(((const be32 *)block)[i]))
+#define blk0(i) (tmp[i] = be32_to_cpu(load_be32_unaligned(&(block)[(i) * 4])))
 
 #define blk(i) (tmp[i & 15] = rol(tmp[(i + 13) & 15] ^ \
                                  tmp[(i +  8) & 15] ^ \
@@ -203,13 +210,12 @@ sha1_final(u8 md[20], SHA_CTX *ctx)
         * final length is a multiple of the block size.  */
        static const u8 padding[64] = {0x80, };
        be64 finalcount = cpu_to_be64(ctx->bytecount << 3);
-       be32 *out = (be32 *)md;
 
        sha1_update(ctx, padding, 64 - ((ctx->bytecount + 8) & 63));
        sha1_update(ctx, &finalcount, 8);
 
        for (int i = 0; i < 5; i++)
-               out[i] = cpu_to_be32(ctx->state[i]);
+               store_be32_unaligned(cpu_to_be32(ctx->state[i]), &md[i * 4]);
 }
 
 /* Calculate the SHA-1 message digest of the specified buffer.