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-rw-r--r--src/argon2-core.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/argon2-core.h b/src/argon2-core.h
index f55d2dd..c8409df 100644
--- a/src/argon2-core.h
+++ b/src/argon2-core.h
@@ -26,6 +26,8 @@
#define CONST_CAST(x) (x)(uintptr_t)
+#define rotr64(x, n) (((x) >> (n)) | ((x) << (64 - (n))))
+
/**********************Argon2 internal constants*******************************/
enum argon2_core_constants {