Add a SHA1 implementation

Add an implementation of the SHA1 hash algorithm based on a public
domain project by Steve Reid <sreid@sea-to-sky.net>. You can get the
original sources from:

    ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c

We will need this for several things. File names of note files will be
generated based on a hash their content instead of using a random name.
Items can be uniquely identified using a hash.

In addition to the regular sha1_init(), sha1_update() and sha1_final()
operations, our implementation also contains wrappers for hashing a
string or a stream.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

1 files changed, 57 insertions, 0 deletions

diff --git a/src/sha1.h b/src/sha1.h
new file mode 100644
index 0000000..2e28bd4
--- /dev/null
+++ b/src/sha1.h
@@ -0,0 +1,57 @@
+/*
+ * Calcurse - text-based organizer
+ *
+ * Copyright (c) 2004-2011 calcurse Development Team <misc@calcurse.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the
+ *        following disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the
+ *        following disclaimer in the documentation and/or other
+ *        materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Send your feedback or comments to : misc@calcurse.org
+ * Calcurse home page : http://calcurse.org
+ *
+ * This code is based on Steve Reid's public domain SHA1 implementation.
+ *
+ * The original version is available at:
+ *    ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c
+ *
+ */
+
+#include <stdint.h>
+
+#define SHA1_BLOCKLEN   64
+#define SHA1_DIGESTLEN  20
+
+typedef struct {
+  uint32_t state[5];
+  uint32_t count[2];
+  uint8_t buffer[SHA1_BLOCKLEN];
+} sha1_ctx_t;
+
+void sha1_init (sha1_ctx_t *);
+void sha1_update (sha1_ctx_t *, const uint8_t *, unsigned int);
+void sha1_final (sha1_ctx_t *, uint8_t *);
+void sha1_digest (const char *, char *);
+void sha1_stream (FILE *, char *);