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authorHung-ying Tyan <tyanh@chromium.org>2014-03-03 12:19:28 +0100
committerTom Rini <trini@ti.com>2014-03-21 16:39:36 -0400
commitbf007ebb6f4b01af675782d23bacbddd17e1a627 (patch)
tree4af7e35d65c7332b6b9e8d7e8bec912d7b6e9193 /include/hash.h
parentdb1b5f3d20666ffd52d649a3bd6141989b596e3f (diff)
gen: Add progressive hash API
Add hash_init(), hash_update() and hash_finish() to the hash_algo struct. Add hash_lookup_algo() to look up the struct given an algorithm name. Signed-off-by: Hung-ying Tyan <tyanh@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Heiko Schocher <hs@denx.de> Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/hash.h')
-rw-r--r--include/hash.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/include/hash.h b/include/hash.h
index e92d27218c4..dc21678045e 100644
--- a/include/hash.h
+++ b/include/hash.h
@@ -27,6 +27,42 @@ struct hash_algo {
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);
};
/*
@@ -77,4 +113,16 @@ int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
int hash_block(const char *algo_name, const void *data, unsigned int len,
uint8_t *output, int *output_size);
+/**
+ * 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);
#endif