crypto: drbg - backport "fix maximum value checks on 32 bit systems"

[deliverable/linux.git] / include / crypto / drbg.h

diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 831d786976c56fe64c71fa7f3f6c400ea4ca7eb4..882675e7c055d8248c724081b199b77e3785066b 100644 (file)
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -162,12 +162,25 @@ static inline size_t drbg_max_request_bytes(struct drbg_state *drbg)
 
 static inline size_t drbg_max_addtl(struct drbg_state *drbg)
 {
+#if (__BITS_PER_LONG == 32)
+       /*
+        * SP800-90A allows smaller maximum numbers to be returned -- we
+        * return SIZE_MAX - 1 to allow the verification of the enforcement
+        * of this value in drbg_healthcheck_sanity.
+        */
+       return (SIZE_MAX - 1);
+#else
        return (1UL<<(drbg->core->max_addtllen));
+#endif
 }
 
 static inline size_t drbg_max_requests(struct drbg_state *drbg)
 {
+#if (__BITS_PER_LONG == 32)
+       return SIZE_MAX;
+#else
        return (1UL<<(drbg->core->max_req));
+#endif
 }
 
 /*