1 files changed, 30 insertions, 0 deletions
diff --git a/src/include/common/hmac.h b/src/include/common/hmac.h
new file mode 100644
index 0000000..c18783f
--- /dev/null
+++ b/src/include/common/hmac.h
@@ -0,0 +1,30 @@
+/*-------------------------------------------------------------------------
+ *
+ * hmac.h
+ *	  Generic headers for HMAC
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/include/common/hmac.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef PG_HMAC_H
+#define PG_HMAC_H
+
+#include "common/cryptohash.h"
+
+/* opaque context, private to each HMAC implementation */
+typedef struct pg_hmac_ctx pg_hmac_ctx;
+
+extern pg_hmac_ctx *pg_hmac_create(pg_cryptohash_type type);
+extern int	pg_hmac_init(pg_hmac_ctx *ctx, const uint8 *key, size_t len);
+extern int	pg_hmac_update(pg_hmac_ctx *ctx, const uint8 *data, size_t len);
+extern int	pg_hmac_final(pg_hmac_ctx *ctx, uint8 *dest, size_t len);
+extern void pg_hmac_free(pg_hmac_ctx *ctx);
+extern const char *pg_hmac_error(pg_hmac_ctx *ctx);
+
+#endif							/* PG_HMAC_H */