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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 SHA1_H
#define SHA1_H
#include <stddef.h>
#include <stdint.h>
#include "chash.h"
/**
* SHA1
* ====
*
* You shouldn't use this for anything new.
*/
/* .. c:macro:: CF_SHA1_HASHSZ
* The output size of SHA1: 20 bytes. */
#define CF_SHA1_HASHSZ 20
/* .. c:macro:: CF_SHA1_BLOCKSZ
* The block size of SHA1: 64 bytes. */
#define CF_SHA1_BLOCKSZ 64
/* .. c:type:: cf_sha1_context
* Incremental SHA1 hashing context.
*
* .. c:member:: cf_sha1_context.H
* Intermediate values.
*
* .. c:member:: cf_sha1_context.partial
* Unprocessed input.
*
* .. c:member:: cf_sha1_context.npartial
* Number of bytes of unprocessed input.
*
* .. c:member:: cf_sha1_context.blocks
* Number of full blocks processed.
*/
typedef struct
{
uint32_t H[5]; /* State. */
uint8_t partial[CF_SHA1_BLOCKSZ]; /* Partial block of input. */
uint32_t blocks; /* Number of full blocks processed into H. */
size_t npartial; /* Number of bytes in prefix of partial. */
} cf_sha1_context;
/* .. c:function:: $DECL
* Sets up `ctx` ready to hash a new message.
*/
extern void cf_sha1_init(cf_sha1_context *ctx);
/* .. c:function:: $DECL
* Hashes `nbytes` at `data`. Copies the data if there isn't enough to make
* a full block.
*/
extern void cf_sha1_update(cf_sha1_context *ctx, const void *data, size_t nbytes);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA1_HASHSZ` bytes to `hash`.
*
* This leaves `ctx` unchanged.
*/
extern void cf_sha1_digest(const cf_sha1_context *ctx, uint8_t hash[CF_SHA1_HASHSZ]);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA1_HASHSZ` bytes to `hash`.
*
* This destroys `ctx`, but uses less stack than :c:func:`cf_sha1_digest`.
*/
extern void cf_sha1_digest_final(cf_sha1_context *ctx, uint8_t hash[CF_SHA1_HASHSZ]);
/* .. c:var:: cf_sha1
* Abstract interface to SHA1. See :c:type:`cf_chash` for more information.
*/
extern const cf_chash cf_sha1;
#endif
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