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-rw-r--r--include/hash.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/hash.h b/include/hash.h
index 2dbbd9b..c402067 100644
--- a/include/hash.h
+++ b/include/hash.h
@@ -71,4 +71,26 @@ enum {
int hash_command(const char *algo_name, int flags, cmd_tbl_t *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