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>
diff --git a/include/hash.h b/include/hash.h
index e92d272..dc21678 100644
--- a/include/hash.h
+++ b/include/hash.h
@@ -27,6 +27,42 @@
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_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