Add SHA1x hash support

[onak.git] / sha1x.h

diff --git a/sha1x.h b/sha1x.h
new file mode 100644 (file)
index 0000000..f1d5dca
--- /dev/null
+++ b/sha1x.h
@@ -0,0 +1,40 @@
+/*
+ * sha1x.h - Double width SHA-1 as per PGP 5.5
+ *
+ * Copyright 2013 Jonathan McDowell <noodles@earth.li>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef __SHA1X_H__
+#define __SHA1X_H__
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#ifdef HAVE_NETTLE
+#include <nettle/sha.h>
+#else
+#include "sha1.h"
+#endif
+
+#define SHA1X_DIGEST_SIZE (2 * SHA1_DIGEST_SIZE)
+
+struct sha1x_ctx {
+       struct sha1_ctx a, b, c, d;
+       bool odd;
+       unsigned char result[SHA1X_DIGEST_SIZE];
+};
+
+void sha1x_init(struct sha1x_ctx *ctx);
+void sha1x_update(struct sha1x_ctx *ctx, unsigned length, const uint8_t *data);
+void sha1x_digest(struct sha1x_ctx *ctx, unsigned length, uint8_t *digest);
+
+#endif /* __SHA1X_H__ */