diff -ruwN source/include/internal/core.h source-new/include/internal/core.h
--- source/include/internal/core.h	1970-01-01 00:00:00.000000000 +0000
+++ source-new/include/internal/core.h	2025-06-21 00:00:00.000000000 +0000
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (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 OSSL_INTERNAL_CORE_H
+# define OSSL_INTERNAL_CORE_H
+# pragma once
+
+/*
+ * namespaces:
+ *
+ * ossl_method_         Core Method API
+ */
+
+/*
+ * construct an arbitrary method from a dispatch table found by looking
+ * up a match for the < operation_id, name, property > combination.
+ * constructor and destructor are the constructor and destructor for that
+ * arbitrary object.
+ *
+ * These objects are normally cached, unless the provider says not to cache.
+ * However, force_cache can be used to force caching whatever the provider
+ * says (for example, because the application knows better).
+ */
+typedef struct ossl_method_construct_method_st {
+    /* Get a temporary store */
+    void *(*get_tmp_store)(void *data);
+    /* Reserve the appropriate method store */
+    int (*lock_store)(void *store, void *data);
+    /* Unreserve the appropriate method store */
+    int (*unlock_store)(void *store, void *data);
+    /* Get an already existing method from a store */
+    void *(*get)(void *store, const OSSL_PROVIDER **prov, void *data);
+    /* Store a method in a store */
+    int (*put)(void *store, void *method, const OSSL_PROVIDER *prov,
+               const char *name, const char *propdef, void *data);
+    /* Construct a new method */
+    void *(*construct)(const OSSL_ALGORITHM *algodef, OSSL_PROVIDER *prov,
+                       void *data);
+    /* Destruct a method */
+    void (*destruct)(void *method, void *data);
+} OSSL_METHOD_CONSTRUCT_METHOD;
+
+void *ossl_method_construct(OSSL_LIB_CTX *ctx, int operation_id,
+                            OSSL_PROVIDER **provider_rw, int force_cache,
+                            OSSL_METHOD_CONSTRUCT_METHOD *mcm, void *mcm_data);
+
+void ossl_algorithm_do_all(OSSL_LIB_CTX *libctx, int operation_id,
+                           OSSL_PROVIDER *provider,
+                           int (*pre)(OSSL_PROVIDER *, int operation_id,
+                                      int no_store, void *data, int *result),
+                           int (*reserve_store)(int no_store, void *data),
+                           void (*fn)(OSSL_PROVIDER *provider,
+                                      const OSSL_ALGORITHM *algo,
+                                      int no_store, void *data),
+                           int (*unreserve_store)(void *data),
+                           int (*post)(OSSL_PROVIDER *, int operation_id,
+                                       int no_store, void *data, int *result),
+                           void *data);
+char *ossl_algorithm_get1_first_name(const OSSL_ALGORITHM *algo);
+
+__owur int ossl_lib_ctx_write_lock(OSSL_LIB_CTX *ctx);
+__owur int ossl_lib_ctx_read_lock(OSSL_LIB_CTX *ctx);
+int ossl_lib_ctx_unlock(OSSL_LIB_CTX *ctx);
+int ossl_lib_ctx_is_child(OSSL_LIB_CTX *ctx);
+#endif
+diff -ruwN source/include/openssl/core.h source-new/include/openssl/core.h
--- source/include/openssl/core.h	1970-01-01 00:00:00.000000000 +0000
+++ source-new/include/openssl/core.h	2025-06-21 00:00:00.000000000 +0000
@@ -0,0 +1,165 @@
+/*
+ * Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (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 OPENSSL_CORE_H
+# define OPENSSL_CORE_H
+# pragma once
+
+# include <stddef.h>
+# include <openssl/types.h>
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+/*-
+ * Base types
+ * ----------
+ *
+ * These are the types that the OpenSSL core and providers have in common
+ * to communicate data between them.
+ */
+
+/* Opaque handles to be used with core upcall functions from providers */
+typedef struct ossl_core_handle_st OSSL_CORE_HANDLE;
+typedef struct openssl_core_ctx_st OPENSSL_CORE_CTX;
+typedef struct ossl_core_bio_st OSSL_CORE_BIO;
+
+/*
+ * Dispatch table element.  function_id numbers and the functions are defined
+ * in core_dispatch.h, see macros with 'OSSL_CORE_MAKE_FUNC' in their names.
+ *
+ * An array of these is always terminated by function_id == 0
+ */
+struct ossl_dispatch_st {
+    int function_id;
+    void (*function)(void);
+};
+
+# define OSSL_DISPATCH_END \
+    { 0, NULL }
+
+/*
+ * Other items, essentially an int<->pointer map element.
+ *
+ * We make this type distinct from OSSL_DISPATCH to ensure that dispatch
+ * tables remain tables with function pointers only.
+ *
+ * This is used whenever we need to pass things like a table of error reason
+ * codes <-> reason string maps, ...
+ *
+ * Usage determines which field works as key if any, rather than field order.
+ *
+ * An array of these is always terminated by id == 0 && ptr == NULL
+ */
+struct ossl_item_st {
+    unsigned int id;
+    void *ptr;
+};
+
+/*
+ * Type to tie together algorithm names, property definition string and
+ * the algorithm implementation in the form of a dispatch table.
+ *
+ * An array of these is always terminated by algorithm_names == NULL
+ */
+struct ossl_algorithm_st {
+    const char *algorithm_names;     /* key */
+    const char *property_definition; /* key */
+    const OSSL_DISPATCH *implementation;
+    const char *algorithm_description;
+};
+
+/*
+ * Type to pass object data in a uniform way, without exposing the object
+ * structure.
+ *
+ * An array of these is always terminated by key == NULL
+ */
+struct ossl_param_st {
+    const char *key;             /* the name of the parameter */
+    unsigned int data_type;      /* declare what kind of content is in buffer */
+    void *data;                  /* value being passed in or out */
+    size_t data_size;            /* data size */
+    size_t return_size;          /* returned content size */
+};
+
+/* Currently supported OSSL_PARAM data types */
+/*
+ * OSSL_PARAM_INTEGER and OSSL_PARAM_UNSIGNED_INTEGER
+ * are arbitrary length and therefore require an arbitrarily sized buffer,
+ * since they may be used to pass numbers larger than what is natively
+ * available.
+ *
+ * The number must be buffered in native form, i.e. MSB first on B_ENDIAN
+ * systems and LSB first on L_ENDIAN systems.  This means that arbitrary
+ * native integers can be stored in the buffer, just make sure that the
+ * buffer size is correct and the buffer itself is properly aligned (for
+ * example by having the buffer field point at a C integer).
+ */
+# define OSSL_PARAM_INTEGER              1
+# define OSSL_PARAM_UNSIGNED_INTEGER     2
+/*-
+ * OSSL_PARAM_REAL
+ * is a C binary floating point values in native form and alignment.
+ */
+# define OSSL_PARAM_REAL                 3
+/*-
+ * OSSL_PARAM_UTF8_STRING
+ * is a printable string.  It is expected to be printed as it is.
+ */
+# define OSSL_PARAM_UTF8_STRING          4
+/*-
+ * OSSL_PARAM_OCTET_STRING
+ * is a string of bytes with no further specification.  It is expected to be
+ * printed as a hexdump.
+ */
+# define OSSL_PARAM_OCTET_STRING         5
+/*-
+ * OSSL_PARAM_UTF8_PTR
+ * is a pointer to a printable string.  It is expected to be printed as it is.
+ *
+ * The difference between this and OSSL_PARAM_UTF8_STRING is that only pointers
+ * are manipulated for this type.
+ *
+ * This is more relevant for parameter requests, where the responding
+ * function doesn't need to copy the data to the provided buffer, but
+ * sets the provided buffer to point at the actual data instead.
+ *
+ * WARNING!  Using these is FRAGILE, as it assumes that the actual
+ * data and its location are constant.
+ *
+ * EXTRA WARNING!  If you are not completely sure you most likely want
+ * to use the OSSL_PARAM_UTF8_STRING type.
+ */
+# define OSSL_PARAM_UTF8_PTR             6
+/*-
+ * OSSL_PARAM_OCTET_PTR
+ * is a pointer to a string of bytes with no further specification.  It is
+ * expected to be printed as a hexdump.
+ *
+ * The difference between this and OSSL_PARAM_OCTET_STRING is that only pointers
+ * are manipulated for this type.
+ *
+ * This is more relevant for parameter requests, where the responding
+ * function doesn't need to copy the data to the provided buffer, but
+ * sets the provided buffer to point at the actual data instead.
+ *
+ * WARNING!  Using these is FRAGILE, as it assumes that the actual
+ * data and its location are constant.
+ *
+ * EXTRA WARNING!  If you are not completely sure you most likely want
+ * to use the OSSL_PARAM_OCTET_STRING type.
+ */
+# define OSSL_PARAM_OCTET_PTR            7
+
+/*
+ * Typedef for the thread stop handling callback. Used both internally and by
+ * providers.
+ *
+ * Providers may register for notifications about threads stopping by
+ * registering a callback to hear about such events. Providers register the
+ * callback using the OSSL_FUNC_CORE_THREAD_START function in the |in| dispatch
+ * table passed to OSSL_provider_init(). The arg passed back to a provider will
+ * be the provider side context object.
+ */
+typedef void (*OSSL_thread_stop_handler_fn)(void *arg);
+
+
+/*-
+ * Provider entry point
+ * --------------------
+ *
+ * This function is expected to be present in any dynamically loadable
+ * provider module.  By definition, if this function doesn't exist in a
+ * module, that module is not an OpenSSL provider module.
+ */
+/*-
+ * |handle|     pointer to opaque type OSSL_CORE_HANDLE.  This can be used
+ *              together with some functions passed via |in| to query data.
+ * |in|         is the array of functions that the Core passes to the provider.
+ * |out|        will be the array of base functions that the provider passes
+ *              back to the Core.
+ * |provctx|    a provider side context object, optionally created if the
+ *              provider needs it.  This value is passed to other provider
+ *              functions, notably other context constructors.
+ */
+typedef int (OSSL_provider_init_fn)(const OSSL_CORE_HANDLE *handle,
+                                    const OSSL_DISPATCH *in,
+                                    const OSSL_DISPATCH **out,
+                                    void **provctx);
+# ifdef __VMS
+#  pragma names save
+#  pragma names uppercase,truncated
+# endif
+OPENSSL_EXPORT OSSL_provider_init_fn OSSL_provider_init;
+# ifdef __VMS
+#  pragma names restore
+# endif
+
+/*
+ * Generic callback function signature.
+ *
+ * The expectation is that any provider function that wants to offer
+ * a callback / hook can do so by taking an argument with this type,
+ * as well as a pointer to caller-specific data.  When calling the
+ * callback, the provider function can populate an OSSL_PARAM array
+ * with data of its choice and pass that in the callback call, along
+ * with the caller data argument.
+ *
+ * libcrypto may use the OSSL_PARAM array to create arguments for an
+ * application callback it knows about.
+ */
+typedef int (OSSL_CALLBACK)(const OSSL_PARAM params[], void *arg);
+typedef int (OSSL_INOUT_CALLBACK)(const OSSL_PARAM in_params[],
+                                  OSSL_PARAM out_params[], void *arg);
+/*
+ * Passphrase callback function signature
+ *
+ * This is similar to the generic callback function above, but adds a
+ * result parameter.
+ */
+typedef int (OSSL_PASSPHRASE_CALLBACK)(char *pass, size_t pass_size,
+                                       size_t *pass_len,
+                                       const OSSL_PARAM params[], void *arg);
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif