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diff --git a/src/common/sha2_int.h b/src/common/sha2_int.h
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+/*-------------------------------------------------------------------------
+ *
+ * sha2_int.h
+ * Internal headers for fallback implementation of SHA{224,256,384,512}
+ *
+ * Portions Copyright (c) 2016-2023, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ * src/common/sha2_int.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+/* $OpenBSD: sha2.h,v 1.2 2004/04/28 23:11:57 millert Exp $ */
+
+/*
+ * FILE: sha2.h
+ * AUTHOR: Aaron D. Gifford <me@aarongifford.com>
+ *
+ * Copyright (c) 2000-2001, Aaron D. Gifford
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $From: sha2.h,v 1.1 2001/11/08 00:02:01 adg Exp adg $
+ */
+
+#ifndef PG_SHA2_INT_H
+#define PG_SHA2_INT_H
+
+#include "common/sha2.h"
+
+typedef struct pg_sha256_ctx
+{
+ uint32 state[8];
+ uint64 bitcount;
+ uint8 buffer[PG_SHA256_BLOCK_LENGTH];
+} pg_sha256_ctx;
+typedef struct pg_sha512_ctx
+{
+ uint64 state[8];
+ uint64 bitcount[2];
+ uint8 buffer[PG_SHA512_BLOCK_LENGTH];
+} pg_sha512_ctx;
+typedef struct pg_sha256_ctx pg_sha224_ctx;
+typedef struct pg_sha512_ctx pg_sha384_ctx;
+
+/* Interface routines for SHA224/256/384/512 */
+extern void pg_sha224_init(pg_sha224_ctx *ctx);
+extern void pg_sha224_update(pg_sha224_ctx *ctx, const uint8 *input0,
+ size_t len);
+extern void pg_sha224_final(pg_sha224_ctx *ctx, uint8 *dest);
+
+extern void pg_sha256_init(pg_sha256_ctx *ctx);
+extern void pg_sha256_update(pg_sha256_ctx *ctx, const uint8 *input0,
+ size_t len);
+extern void pg_sha256_final(pg_sha256_ctx *ctx, uint8 *dest);
+
+extern void pg_sha384_init(pg_sha384_ctx *ctx);
+extern void pg_sha384_update(pg_sha384_ctx *ctx,
+ const uint8 *, size_t len);
+extern void pg_sha384_final(pg_sha384_ctx *ctx, uint8 *dest);
+
+extern void pg_sha512_init(pg_sha512_ctx *ctx);
+extern void pg_sha512_update(pg_sha512_ctx *ctx, const uint8 *input0,
+ size_t len);
+extern void pg_sha512_final(pg_sha512_ctx *ctx, uint8 *dest);
+
+#endif /* PG_SHA2_INT_H */