hash: Add a way to calculate a hash for any algortihm
Rather than needing to call one of many hashing algorithms in U-Boot,
provide a function hash_block() which handles this, and can support all
available hash algorithms.
Once we have md5 supported within hashing, we can use this function in
the FIT image code.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/hash.c b/common/hash.c
index c9ac33e..fe19b73 100644
--- a/common/hash.c
+++ b/common/hash.c
@@ -30,6 +30,7 @@
#include <sha1.h>
#include <sha256.h>
#include <asm/io.h>
+#include <asm/errno.h>
/*
* These are the hash algorithms we support. Chips which support accelerated
@@ -238,6 +239,28 @@
printf("%02x", output[i]);
}
+int hash_block(const char *algo_name, const void *data, unsigned int len,
+ uint8_t *output, int *output_size)
+{
+ struct hash_algo *algo;
+
+ algo = find_hash_algo(algo_name);
+ if (!algo) {
+ debug("Unknown hash algorithm '%s'\n", algo_name);
+ return -EPROTONOSUPPORT;
+ }
+ if (output_size && *output_size < algo->digest_size) {
+ debug("Output buffer size %d too small (need %d bytes)",
+ *output_size, algo->digest_size);
+ return -ENOSPC;
+ }
+ if (output_size)
+ *output_size = algo->digest_size;
+ algo->hash_func_ws(data, len, output, algo->chunk_size);
+
+ return 0;
+}
+
int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{