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+/*
+ * cifra - embedded cryptography library
+ * Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
+ *
+ * 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. This software is distributed without any
+ * warranty.
+ *
+ * You should have received a copy of the CC0 Public Domain Dedication
+ * along with this software. If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#ifndef CHASH_H
+#define CHASH_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * General hash function description
+ * =================================
+ * This allows us to make use of hash functions without depending
+ * on a specific one.  This is useful in implementing, for example,
+ * :doc:`HMAC <hmac>`.
+ */
+
+/* .. c:type:: cf_chash_init
+ * Hashing initialisation function type.
+ *
+ * Functions of this type should initialise the context in preparation
+ * for hashing a message with `cf_chash_update` functions.
+ *
+ * :rtype: void
+ * :param ctx: hash function-specific context structure.
+ */
+typedef void (*cf_chash_init)(void *ctx);
+
+/* .. c:type:: cf_chash_update
+ * Hashing data processing function type.
+ *
+ * Functions of this type hash `count` bytes of data at `data`,
+ * updating the contents of `ctx`.
+ *
+ * :rtype: void
+ * :param ctx: hash function-specific context structure.
+ * :param data: input data to hash.
+ * :param count: number of bytes to hash.
+ */
+typedef void (*cf_chash_update)(void *ctx, const void *data, size_t count);
+
+/* .. c:type:: cf_chash_digest
+ * Hashing completion function type.
+ *
+ * Functions of this type complete a hashing operation,
+ * writing :c:member:`cf_chash.hashsz` bytes to `hash`.
+ *
+ * This function does not change `ctx` -- any padding which needs doing
+ * must be done seperately (in a copy of `ctx`, say).
+ *
+ * This means you can interlave `_update` and `_digest` calls to
+ * learn `H(A)` and `H(A || B)` without hashing `A` twice.
+ *
+ * :rtype: void
+ * :param ctx: hash function-specific context structure.
+ * :param hash: location to write hash result.
+ */
+typedef void (*cf_chash_digest)(const void *ctx, uint8_t *hash);
+
+/* .. c:type:: cf_chash
+ * This type describes an incremental hash function in an abstract way.
+ *
+ * .. c:member:: cf_chash.hashsz
+ * The hash function's output, in bytes.
+ *
+ * .. c:member:: cf_chash.blocksz
+ * The hash function's internal block size, in bytes.
+ *
+ * .. c:member:: cf_chash.init
+ * Context initialisation function.
+ *
+ * .. c:member:: cf_chash:update
+ * Data processing function.
+ *
+ * .. c:member:: cf_chash:digest
+ * Completion function.
+ *
+ */
+typedef struct
+{
+  size_t hashsz;
+  size_t blocksz;
+
+  cf_chash_init init;
+  cf_chash_update update;
+  cf_chash_digest digest;
+} cf_chash;
+
+/* .. c:macro:: CF_CHASH_MAXCTX
+ * The maximum size of a :c:type:`cf_chash_ctx`.  This allows
+ * use to put a structure in automatic storage that can
+ * store working data for any supported hash function. */
+#define CF_CHASH_MAXCTX 360
+
+/* .. c:macro:: CF_CHASH_MAXBLK
+ * Maximum hash function block size (in bytes). */
+#define CF_CHASH_MAXBLK 128
+
+/* .. c:macro:: CF_MAXHASH
+ * Maximum hash function output (in bytes). */
+#define CF_MAXHASH 64
+
+/* .. c:type:: cf_chash_ctx
+ * A type usable with any `cf_chash` as a context. */
+typedef union
+{
+  uint8_t ctx[CF_CHASH_MAXCTX];
+  uint16_t u16;
+  uint32_t u32;
+  uint64_t u64;
+} cf_chash_ctx;
+
+/* .. c:function:: $DECL
+ * One shot hashing: `out = h(m)`.
+ *
+ * Using the hash function `h`, `nm` bytes at `m` are hashed and `h->hashsz` bytes
+ * of result is written to the buffer `out`.
+ *
+ * :param h: hash function description.
+ * :param m: message buffer.
+ * :param nm: message length.
+ * :param out: hash result buffer (written).
+ */
+void cf_hash(const cf_chash *h, const void *m, size_t nm, uint8_t *out);
+
+#endif