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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 SHA2_H
#define SHA2_H
#include <stddef.h>
#include <stdint.h>
#include "chash.h"
/**
* SHA224/SHA256
* =============
*/
/* .. c:macro:: CF_SHA224_HASHSZ
* The output size of SHA224: 28 bytes. */
#define CF_SHA224_HASHSZ 28
/* .. c:macro:: CF_SHA224_BLOCKSZ
* The block size of SHA224: 64 bytes. */
#define CF_SHA224_BLOCKSZ 64
/* .. c:macro:: CF_SHA256_HASHSZ
* The output size of SHA256: 32 bytes. */
#define CF_SHA256_HASHSZ 32
/* .. c:macro:: CF_SHA256_BLOCKSZ
* The block size of SHA256: 64 bytes. */
#define CF_SHA256_BLOCKSZ 64
/* .. c:type:: cf_sha256_context
* Incremental SHA256 hashing context.
*
* .. c:member:: cf_sha256_context.H
* Intermediate values.
*
* .. c:member:: cf_sha256_context.partial
* Unprocessed input.
*
* .. c:member:: cf_sha256_context.npartial
* Number of bytes of unprocessed input.
*
* .. c:member:: cf_sha256_context.blocks
* Number of full blocks processed.
*/
typedef struct
{
uint32_t H[8]; /* State. */
uint8_t partial[CF_SHA256_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_sha256_context;
/* .. c:function:: $DECL
* Sets up `ctx` ready to hash a new message.
*/
extern void cf_sha256_init(cf_sha256_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_sha256_update(cf_sha256_context *ctx, const void *data, size_t nbytes);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA256_HASHSZ` bytes to `hash`.
*
* This leaves `ctx` unchanged.
*/
extern void cf_sha256_digest(const cf_sha256_context *ctx, uint8_t hash[CF_SHA256_HASHSZ]);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA256_HASHSZ` bytes to `hash`.
*
* This destroys `ctx`, but uses less stack than :c:func:`cf_sha256_digest`.
*/
extern void cf_sha256_digest_final(cf_sha256_context *ctx, uint8_t hash[CF_SHA256_HASHSZ]);
/* .. c:function:: $DECL
* Sets up `ctx` ready to hash a new message.
*
* nb. SHA224 uses SHA256's underlying types.
*/
extern void cf_sha224_init(cf_sha256_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_sha224_update(cf_sha256_context *ctx, const void *data, size_t nbytes);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA224_HASHSZ` bytes to `hash`.
*
* This leaves `ctx` unchanged.
*/
extern void cf_sha224_digest(const cf_sha256_context *ctx, uint8_t hash[CF_SHA224_HASHSZ]);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA224_HASHSZ` bytes to `hash`.
*
* This destroys `ctx`, but uses less stack than :c:func:`cf_sha224_digest`.
*/
extern void cf_sha224_digest_final(cf_sha256_context *ctx, uint8_t hash[CF_SHA224_HASHSZ]);
/* .. c:var:: cf_sha224
* Abstract interface to SHA224. See :c:type:`cf_chash` for more information.
*/
extern const cf_chash cf_sha224;
/* .. c:var:: cf_sha256
* Abstract interface to SHA256. See :c:type:`cf_chash` for more information.
*/
extern const cf_chash cf_sha256;
/**
* SHA384/SHA512
* =============
*/
/* .. c:macro:: CF_SHA384_HASHSZ
* The output size of SHA384: 48 bytes. */
#define CF_SHA384_HASHSZ 48
/* .. c:macro:: CF_SHA384_BLOCKSZ
* The block size of SHA384: 128 bytes. */
#define CF_SHA384_BLOCKSZ 128
/* .. c:macro:: CF_SHA512_HASHSZ
* The output size of SHA512: 64 bytes. */
#define CF_SHA512_HASHSZ 64
/* .. c:macro:: CF_SHA512_BLOCKSZ
* The block size of SHA512: 128 bytes. */
#define CF_SHA512_BLOCKSZ 128
/* .. c:type:: cf_sha512_context
* Incremental SHA512 hashing context.
*
* .. c:member:: cf_sha512_context.H
* Intermediate values.
*
* .. c:member:: cf_sha512_context.partial
* Unprocessed input.
*
* .. c:member:: cf_sha512_context.npartial
* Number of bytes of unprocessed input.
*
* .. c:member:: cf_sha512_context.blocks
* Number of full blocks processed.
*/
typedef struct
{
uint64_t H[8];
uint8_t partial[CF_SHA512_BLOCKSZ];
uint32_t blocks;
size_t npartial;
} cf_sha512_context;
/* .. c:function:: $DECL
* Sets up `ctx` ready to hash a new message.
*/
extern void cf_sha512_init(cf_sha512_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_sha512_update(cf_sha512_context *ctx, const void *data, size_t nbytes);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA512_HASHSZ` bytes to `hash`.
*
* This leaves `ctx` unchanged.
*/
extern void cf_sha512_digest(const cf_sha512_context *ctx, uint8_t hash[CF_SHA512_HASHSZ]);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA512_HASHSZ` bytes to `hash`.
*
* This destroys `ctx`, but uses less stack than :c:func:`cf_sha512_digest`.
*/
extern void cf_sha512_digest_final(cf_sha512_context *ctx, uint8_t hash[CF_SHA512_HASHSZ]);
/* .. c:function:: $DECL
* Sets up `ctx` ready to hash a new message.
*
* nb. SHA384 uses SHA512's underlying types.
*/
extern void cf_sha384_init(cf_sha512_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_sha384_update(cf_sha512_context *ctx, const void *data, size_t nbytes);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA384_HASHSZ` bytes to `hash`.
*
* This leaves `ctx` unchanged.
*/
extern void cf_sha384_digest(const cf_sha512_context *ctx, uint8_t hash[CF_SHA384_HASHSZ]);
/* .. c:function:: $DECL
* Finishes the hash operation, writing `CF_SHA384_HASHSZ` bytes to `hash`.
*
* This destroys `ctx`, but uses less stack than :c:func:`cf_sha384_digest`.
*/
extern void cf_sha384_digest_final(cf_sha512_context *ctx, uint8_t hash[CF_SHA384_HASHSZ]);
/* .. c:var:: cf_sha384
* Abstract interface to SHA384. See :c:type:`cf_chash` for more information.
*/
extern const cf_chash cf_sha384;
/* .. c:var:: cf_sha512
* Abstract interface to SHA512. See :c:type:`cf_chash` for more information.
*/
extern const cf_chash cf_sha512;
#endif
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