crypto: inside-secure - add support for arbitrary size hash/HMAC updates

This patch fixes an issue with hash and HMAC operations that perform
"large" intermediate updates (i.e. combined size > 2 hash blocks) by
actually making use of the hardware's hash continue capabilities.
The original implementation would cache these updates in a buffer that
was 2 hash blocks in size and fail if all update calls combined would
overflow that buffer. Which caused the cryptomgr extra tests to fail.
Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/inside-secure/safexcel.h

@@ -637,6 +637,8 @@ struct safexcel_context {
 	bool exit_inv;
 };
 
+#define HASH_CACHE_SIZE			SHA512_BLOCK_SIZE
+
 struct safexcel_ahash_export_state {
 	u64 len[2];
 	u64 processed[2];
@@ -644,7 +646,7 @@ struct safexcel_ahash_export_state {
 	u32 digest;
 
 	u32 state[SHA512_DIGEST_SIZE / sizeof(u32)];
-	u8 cache[SHA512_BLOCK_SIZE << 1];
+	u8 cache[HASH_CACHE_SIZE];
 };
 
 /*