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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2012 The Chromium OS Authors.
*/
#ifndef _HASH_H
#define _HASH_H
#ifdef USE_HOSTCC
#include <linux/kconfig.h>
#endif
struct cmd_tbl;
/*
* Maximum digest size for all algorithms we support. Having this value
* avoids a malloc() or C99 local declaration in common/cmd_hash.c.
*/
#if CONFIG_IS_ENABLED(SHA384) || CONFIG_IS_ENABLED(SHA512)
#define HASH_MAX_DIGEST_SIZE 64
#else
#define HASH_MAX_DIGEST_SIZE 32
#endif
enum {
HASH_FLAG_VERIFY = 1 << 0, /* Enable verify mode */
HASH_FLAG_ENV = 1 << 1, /* Allow env vars */
};
struct hash_algo {
const char *name; /* Name of algorithm */
int digest_size; /* Length of digest */
/**
* hash_func_ws: Generic hashing function
*
* This is the generic prototype for a hashing function. We only
* have the watchdog version at present.
*
* @input: Input buffer
* @ilen: Input buffer length
* @output: Checksum result (length depends on algorithm)
* @chunk_sz: Trigger watchdog after processing this many bytes
*/
void (*hash_func_ws)(const unsigned char *input, unsigned int ilen,
unsigned char *output, unsigned int chunk_sz);
int chunk_size; /* Watchdog chunk size */
/*
* hash_init: Create the context for progressive hashing
*
* @algo: Pointer to the hash_algo struct
* @ctxp: Pointer to the pointer of the context for hashing
* @return 0 if ok, -1 on error
*/
int (*hash_init)(struct hash_algo *algo, void **ctxp);
/*
* hash_update: Perform hashing on the given buffer
*
* The context is freed by this function if an error occurs.
*
* @algo: Pointer to the hash_algo struct
* @ctx: Pointer to the context for hashing
* @buf: Pointer to the buffer being hashed
* @size: Size of the buffer being hashed
* @is_last: 1 if this is the last update; 0 otherwise
* @return 0 if ok, -1 on error
*/
int (*hash_update)(struct hash_algo *algo, void *ctx, const void *buf,
unsigned int size, int is_last);
/*
* hash_finish: Write the hash result to the given buffer
*
* The context is freed by this function.
*
* @algo: Pointer to the hash_algo struct
* @ctx: Pointer to the context for hashing
* @dest_buf: Pointer to the buffer for the result
* @size: Size of the buffer for the result
* @return 0 if ok, -ENOSPC if size of the result buffer is too small
* or -1 on other errors
*/
int (*hash_finish)(struct hash_algo *algo, void *ctx, void *dest_buf,
int size);
};
#ifndef USE_HOSTCC
/**
* hash_command: Process a hash command for a particular algorithm
*
* This common function is used to implement specific hash commands.
*
* @algo_name: Hash algorithm being used (lower case!)
* @flags: Flags value (HASH_FLAG_...)
* @cmdtp: Pointer to command table entry
* @flag: Some flags normally 0 (see CMD_FLAG_.. above)
* @argc: Number of arguments (arg 0 must be the command text)
* @argv: Arguments
*/
int hash_command(const char *algo_name, int flags, struct cmd_tbl *cmdtp,
int flag, int argc, char *const argv[]);
/**
* hash_block() - Hash a block according to the requested algorithm
*
* The caller probably knows the hash length for the chosen algorithm, but
* in order to provide a general interface, and output_size parameter is
* provided.
*
* @algo_name: Hash algorithm to use
* @data: Data to hash
* @len: Lengh of data to hash in bytes
* @output: Place to put hash value
* @output_size: On entry, pointer to the number of bytes available in
* output. On exit, pointer to the number of bytes used.
* If NULL, then it is assumed that the caller has
* allocated enough space for the hash. This is possible
* since the caller is selecting the algorithm.
* Return: 0 if ok, -ve on error: -EPROTONOSUPPORT for an unknown algorithm,
* -ENOSPC if the output buffer is not large enough.
*/
int hash_block(const char *algo_name, const void *data, unsigned int len,
uint8_t *output, int *output_size);
#endif /* !USE_HOSTCC */
/**
* hash_lookup_algo() - Look up the hash_algo struct for an algorithm
*
* The function returns the pointer to the struct or -EPROTONOSUPPORT if the
* algorithm is not available.
*
* @algo_name: Hash algorithm to look up
* @algop: Pointer to the hash_algo struct if found
*
* Return: 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
*/
int hash_lookup_algo(const char *algo_name, struct hash_algo **algop);
/**
* hash_progressive_lookup_algo() - Look up hash_algo for prog. hash support
*
* The function returns the pointer to the struct or -EPROTONOSUPPORT if the
* algorithm is not available with progressive hash support.
*
* @algo_name: Hash algorithm to look up
* @algop: Pointer to the hash_algo struct if found
*
* Return: 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
*/
int hash_progressive_lookup_algo(const char *algo_name,
struct hash_algo **algop);
/**
* hash_parse_string() - Parse hash string into a binary array
*
* The function parses a hash string into a binary array that
* can for example easily be used to compare to hash values.
*
* @algo_name: Hash algorithm to look up
* @str: Hash string to get parsed
* @result: Binary array of the parsed hash string
*
* Return: 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
*/
int hash_parse_string(const char *algo_name, const char *str, uint8_t *result);
#endif
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