Create a third_party directory for files copied from other projects.

[cumulus.git] / third_party / sha1.h

diff --git a/third_party/sha1.h b/third_party/sha1.h
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+/* Declarations of functions and data types used for SHA1 sum library
+ * functions.
+ * part of Cumulus: Smart Filesystem Backup to Dumb Servers
+ *
+ * Copyright (C) 2000, 2001, 2003, 2005 Free Software Foundation, Inc.
+ * Copyright (C) 2006-2007  The Regents of the University of California
+ *
+ * Original code (in C) is taken from GNU coreutils (Debian package 5.97-5).
+ * Modifications by Michael Vrable <mvrable@cs.ucsd.edu> to integrate into
+ * Cumulus.
+ *
+ * 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.
+ *
+ * This program 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
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef SHA1_H
+# define SHA1_H 1
+
+# include <stdio.h>
+# include <stdint.h>
+
+#include <string>
+
+typedef uint32_t md5_uint32;
+
+/* Structure to save state of computation between the single steps.  */
+struct sha1_ctx
+{
+  md5_uint32 A;
+  md5_uint32 B;
+  md5_uint32 C;
+  md5_uint32 D;
+  md5_uint32 E;
+
+  md5_uint32 total[2];
+  md5_uint32 buflen;
+  char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32))));
+};
+
+
+/* Initialize structure containing state of computation. */
+extern void sha1_init_ctx (struct sha1_ctx *ctx);
+
+/* Starting with the result of former calls of this function (or the
+   initialization function update the context for the next LEN bytes
+   starting at BUFFER.
+   It is necessary that LEN is a multiple of 64!!! */
+extern void sha1_process_block (const void *buffer, size_t len,
+                               struct sha1_ctx *ctx);
+
+/* Starting with the result of former calls of this function (or the
+   initialization function update the context for the next LEN bytes
+   starting at BUFFER.
+   It is NOT required that LEN is a multiple of 64.  */
+extern void sha1_process_bytes (const void *buffer, size_t len,
+                               struct sha1_ctx *ctx);
+
+/* Process the remaining bytes in the buffer and put result from CTX
+   in first 20 bytes following RESBUF.  The result is always in little
+   endian byte order, so that a byte-wise output yields to the wanted
+   ASCII representation of the message digest.
+
+   IMPORTANT: On some systems it is required that RESBUF be correctly
+   aligned for a 32 bits value.  */
+extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
+
+
+/* Put result from CTX in first 20 bytes following RESBUF.  The result is
+   always in little endian byte order, so that a byte-wise output yields
+   to the wanted ASCII representation of the message digest.
+
+   IMPORTANT: On some systems it is required that RESBUF is correctly
+   aligned for a 32 bits value.  */
+extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
+
+/* An object-oriented wrapper around checksumming functionality. */
+class SHA1Checksum {
+private:
+    struct sha1_ctx ctx;
+    char resbuf[20] __attribute__ ((__aligned__ (__alignof__ (md5_uint32))));
+
+public:
+    SHA1Checksum();
+    ~SHA1Checksum();
+
+    void process(const void *data, size_t len);
+    bool process_file(const char *filename);
+    const uint8_t *checksum();
+    size_t checksum_size() const { return 20; }
+    std::string checksum_str();
+};
+
+#endif