2 * Copyright (c) 2012 The Chromium OS Authors.
3 * SPDX-License-Identifier: GPL-2.0+
10 * Maximum digest size for all algorithms we support. Having this value
11 * avoids a malloc() or C99 local declaration in common/cmd_hash.c.
13 #define HASH_MAX_DIGEST_SIZE 32
16 HASH_FLAG_VERIFY = 1 << 0, /* Enable verify mode */
17 HASH_FLAG_ENV = 1 << 1, /* Allow env vars */
21 const char *name; /* Name of algorithm */
22 int digest_size; /* Length of digest */
24 * hash_func_ws: Generic hashing function
26 * This is the generic prototype for a hashing function. We only
27 * have the watchdog version at present.
29 * @input: Input buffer
30 * @ilen: Input buffer length
31 * @output: Checksum result (length depends on algorithm)
32 * @chunk_sz: Trigger watchdog after processing this many bytes
34 void (*hash_func_ws)(const unsigned char *input, unsigned int ilen,
35 unsigned char *output, unsigned int chunk_sz);
36 int chunk_size; /* Watchdog chunk size */
38 * hash_init: Create the context for progressive hashing
40 * @algo: Pointer to the hash_algo struct
41 * @ctxp: Pointer to the pointer of the context for hashing
42 * @return 0 if ok, -1 on error
44 int (*hash_init)(struct hash_algo *algo, void **ctxp);
46 * hash_update: Perform hashing on the given buffer
48 * The context is freed by this function if an error occurs.
50 * @algo: Pointer to the hash_algo struct
51 * @ctx: Pointer to the context for hashing
52 * @buf: Pointer to the buffer being hashed
53 * @size: Size of the buffer being hashed
54 * @is_last: 1 if this is the last update; 0 otherwise
55 * @return 0 if ok, -1 on error
57 int (*hash_update)(struct hash_algo *algo, void *ctx, const void *buf,
58 unsigned int size, int is_last);
60 * hash_finish: Write the hash result to the given buffer
62 * The context is freed by this function.
64 * @algo: Pointer to the hash_algo struct
65 * @ctx: Pointer to the context for hashing
66 * @dest_buf: Pointer to the buffer for the result
67 * @size: Size of the buffer for the result
68 * @return 0 if ok, -ENOSPC if size of the result buffer is too small
69 * or -1 on other errors
71 int (*hash_finish)(struct hash_algo *algo, void *ctx, void *dest_buf,
77 * hash_command: Process a hash command for a particular algorithm
79 * This common function is used to implement specific hash commands.
81 * @algo_name: Hash algorithm being used (lower case!)
82 * @flags: Flags value (HASH_FLAG_...)
83 * @cmdtp: Pointer to command table entry
84 * @flag: Some flags normally 0 (see CMD_FLAG_.. above)
85 * @argc: Number of arguments (arg 0 must be the command text)
88 int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
89 int argc, char * const argv[]);
92 * hash_block() - Hash a block according to the requested algorithm
94 * The caller probably knows the hash length for the chosen algorithm, but
95 * in order to provide a general interface, and output_size parameter is
98 * @algo_name: Hash algorithm to use
100 * @len: Lengh of data to hash in bytes
101 * @output: Place to put hash value
102 * @output_size: On entry, pointer to the number of bytes available in
103 * output. On exit, pointer to the number of bytes used.
104 * If NULL, then it is assumed that the caller has
105 * allocated enough space for the hash. This is possible
106 * since the caller is selecting the algorithm.
107 * @return 0 if ok, -ve on error: -EPROTONOSUPPORT for an unknown algorithm,
108 * -ENOSPC if the output buffer is not large enough.
110 int hash_block(const char *algo_name, const void *data, unsigned int len,
111 uint8_t *output, int *output_size);
113 #endif /* !USE_HOSTCC */
116 * hash_lookup_algo() - Look up the hash_algo struct for an algorithm
118 * The function returns the pointer to the struct or -EPROTONOSUPPORT if the
119 * algorithm is not available.
121 * @algo_name: Hash algorithm to look up
122 * @algop: Pointer to the hash_algo struct if found
124 * @return 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
126 int hash_lookup_algo(const char *algo_name, struct hash_algo **algop);
129 * hash_progressive_lookup_algo() - Look up hash_algo for prog. hash support
131 * The function returns the pointer to the struct or -EPROTONOSUPPORT if the
132 * algorithm is not available with progressive hash support.
134 * @algo_name: Hash algorithm to look up
135 * @algop: Pointer to the hash_algo struct if found
137 * @return 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
139 int hash_progressive_lookup_algo(const char *algo_name,
140 struct hash_algo **algop);
143 * hash_parse_string() - Parse hash string into a binary array
145 * The function parses a hash string into a binary array that
146 * can for example easily be used to compare to hash values.
148 * @algo_name: Hash algorithm to look up
149 * @str: Hash string to get parsed
150 * @result: Binary array of the parsed hash string
152 * @return 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
154 int hash_parse_string(const char *algo_name, const char *str, uint8_t *result);