1 files changed, 25 insertions, 0 deletions
diff --git a/crypto/hmac/hmac_lcl.h b/crypto/hmac/hmac_lcl.h
new file mode 100644
index 000000000000..8fd8345694a2
--- /dev/null
+++ b/crypto/hmac/hmac_lcl.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#ifndef HEADER_HMAC_LCL_H
+# define HEADER_HMAC_LCL_H
+
+/* The current largest case is for SHA3-224 */
+#define HMAC_MAX_MD_CBLOCK_SIZE     144
+
+struct hmac_ctx_st {
+    const EVP_MD *md;
+    EVP_MD_CTX *md_ctx;
+    EVP_MD_CTX *i_ctx;
+    EVP_MD_CTX *o_ctx;
+    unsigned int key_length;
+    unsigned char key[HMAC_MAX_MD_CBLOCK_SIZE];
+};
+
+#endif