providers/implementations/kdfs/pkcs12kdf.c - third_party/openssl - Git at Google

 /*
  * Copyright 1999-2021 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
  */

 #include <openssl/trace.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
 #include <openssl/evp.h>
 #include <openssl/kdf.h>
 #include <openssl/core_names.h>
 #include <openssl/proverr.h>
 #include "internal/cryptlib.h"
 #include "internal/numbers.h"
 #include "crypto/evp.h"
 #include "prov/provider_ctx.h"
 #include "prov/providercommon.h"
 #include "prov/implementations.h"
 #include "prov/provider_util.h"

 static OSSL_FUNC_kdf_newctx_fn kdf_pkcs12_new;
 static OSSL_FUNC_kdf_dupctx_fn kdf_pkcs12_dup;
 static OSSL_FUNC_kdf_freectx_fn kdf_pkcs12_free;
 static OSSL_FUNC_kdf_reset_fn kdf_pkcs12_reset;
 static OSSL_FUNC_kdf_derive_fn kdf_pkcs12_derive;
 static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pkcs12_settable_ctx_params;
 static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pkcs12_set_ctx_params;
 static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pkcs12_gettable_ctx_params;
 static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pkcs12_get_ctx_params;

 typedef struct {
     void *provctx;
     PROV_DIGEST digest;
     unsigned char *pass;
     size_t pass_len;
     unsigned char *salt;
     size_t salt_len;
     uint64_t iter;
     int id;
 } KDF_PKCS12;

 /* PKCS12 compatible key/IV generation */

 static int pkcs12kdf_derive(const unsigned char *pass, size_t passlen,
                             const unsigned char *salt, size_t saltlen,
                             int id, uint64_t iter, const EVP_MD *md_type,
                             unsigned char *out, size_t n)
 {
     unsigned char *B = NULL, *D = NULL, *I = NULL, *p = NULL, *Ai = NULL;
     size_t Slen, Plen, Ilen;
     size_t i, j, k, u, v;
     uint64_t iter_cnt;
     int ret = 0, ui, vi;
     EVP_MD_CTX *ctx = NULL;

     ctx = EVP_MD_CTX_new();
     if (ctx == NULL) {
         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
         goto end;
     }
     vi = EVP_MD_get_block_size(md_type);
     ui = EVP_MD_get_size(md_type);
     if (ui <= 0 || vi <= 0) {
         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_SIZE);
         goto end;
     }
     u = (size_t)ui;
     v = (size_t)vi;
     D = OPENSSL_malloc(v);
     Ai = OPENSSL_malloc(u);
     B = OPENSSL_malloc(v + 1);
     Slen = v * ((saltlen + v - 1) / v);
     if (passlen != 0)
         Plen = v * ((passlen + v - 1) / v);
     else
         Plen = 0;
     Ilen = Slen + Plen;
     I = OPENSSL_malloc(Ilen);
     if (D == NULL || Ai == NULL || B == NULL || I == NULL) {
         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
         goto end;
     }
     for (i = 0; i < v; i++)
         D[i] = id;
     p = I;
     for (i = 0; i < Slen; i++)
         *p++ = salt[i % saltlen];
     for (i = 0; i < Plen; i++)
         *p++ = pass[i % passlen];
     for (;;) {
         if (!EVP_DigestInit_ex(ctx, md_type, NULL)
             || !EVP_DigestUpdate(ctx, D, v)
             || !EVP_DigestUpdate(ctx, I, Ilen)
             || !EVP_DigestFinal_ex(ctx, Ai, NULL))
             goto end;
         for (iter_cnt = 1; iter_cnt < iter; iter_cnt++) {
             if (!EVP_DigestInit_ex(ctx, md_type, NULL)
                 || !EVP_DigestUpdate(ctx, Ai, u)
                 || !EVP_DigestFinal_ex(ctx, Ai, NULL))
                 goto end;
         }
         memcpy(out, Ai, n < u ? n : u);
         if (u >= n) {
             ret = 1;
             break;
         }
         n -= u;
         out += u;
         for (j = 0; j < v; j++)
             B[j] = Ai[j % u];
         for (j = 0; j < Ilen; j += v) {
             unsigned char *Ij = I + j;
             uint16_t c = 1;

             /* Work out Ij = Ij + B + 1 */
             for (k = v; k > 0;) {
                 k--;
                 c += Ij[k] + B[k];
                 Ij[k] = (unsigned char)c;
                 c >>= 8;
             }
         }
     }

  end:
     OPENSSL_free(Ai);
     OPENSSL_free(B);
     OPENSSL_free(D);
     OPENSSL_free(I);
     EVP_MD_CTX_free(ctx);
     return ret;
 }

 static void *kdf_pkcs12_new(void *provctx)
 {
     KDF_PKCS12 *ctx;

     if (!ossl_prov_is_running())
         return NULL;

     ctx = OPENSSL_zalloc(sizeof(*ctx));
     if (ctx == NULL) {
         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
         return NULL;
     }
     ctx->provctx = provctx;
     return ctx;
 }

 static void kdf_pkcs12_cleanup(KDF_PKCS12 *ctx)
 {
     ossl_prov_digest_reset(&ctx->digest);
     OPENSSL_free(ctx->salt);
     OPENSSL_clear_free(ctx->pass, ctx->pass_len);
     memset(ctx, 0, sizeof(*ctx));
 }

 static void kdf_pkcs12_free(void *vctx)
 {
     KDF_PKCS12 *ctx = (KDF_PKCS12 *)vctx;

     if (ctx != NULL) {
         kdf_pkcs12_cleanup(ctx);
         OPENSSL_free(ctx);
     }
 }

 static void kdf_pkcs12_reset(void *vctx)
 {
     KDF_PKCS12 *ctx = (KDF_PKCS12 *)vctx;
     void *provctx = ctx->provctx;

     kdf_pkcs12_cleanup(ctx);
     ctx->provctx = provctx;
 }

 static void *kdf_pkcs12_dup(void *vctx)
 {
     const KDF_PKCS12 *src = (const KDF_PKCS12 *)vctx;
     KDF_PKCS12 *dest;

     dest = kdf_pkcs12_new(src->provctx);
     if (dest != NULL) {
         if (!ossl_prov_memdup(src->salt, src->salt_len,
                               &dest->salt, &dest->salt_len)
                 || !ossl_prov_memdup(src->pass, src->pass_len,
                                      &dest->pass , &dest->pass_len)
                 || !ossl_prov_digest_copy(&dest->digest, &src->digest))
             goto err;
         dest->iter = src->iter;
         dest->id = src->id;
     }
     return dest;

  err:
     kdf_pkcs12_free(dest);
     return NULL;
 }

 static int pkcs12kdf_set_membuf(unsigned char **buffer, size_t *buflen,
                              const OSSL_PARAM *p)
 {
     OPENSSL_clear_free(*buffer, *buflen);
     *buffer = NULL;
     *buflen = 0;

     if (p->data_size == 0) {
         if ((*buffer = OPENSSL_malloc(1)) == NULL) {
             ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
             return 0;
         }
     } else if (p->data != NULL) {
         if (!OSSL_PARAM_get_octet_string(p, (void **)buffer, 0, buflen))
             return 0;
     }
     return 1;
 }

 static int kdf_pkcs12_derive(void *vctx, unsigned char *key, size_t keylen,
                              const OSSL_PARAM params[])
 {
     KDF_PKCS12 *ctx = (KDF_PKCS12 *)vctx;
     const EVP_MD *md;

     if (!ossl_prov_is_running() || !kdf_pkcs12_set_ctx_params(ctx, params))
         return 0;

     if (ctx->pass == NULL) {
         ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_PASS);
         return 0;
     }

     if (ctx->salt == NULL) {
         ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SALT);
         return 0;
     }

     md = ossl_prov_digest_md(&ctx->digest);
     return pkcs12kdf_derive(ctx->pass, ctx->pass_len, ctx->salt, ctx->salt_len,
                             ctx->id, ctx->iter, md, key, keylen);
 }

 static int kdf_pkcs12_set_ctx_params(void *vctx, const OSSL_PARAM params[])
 {
     const OSSL_PARAM *p;
     KDF_PKCS12 *ctx = vctx;
     OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);

     if (params == NULL)
         return 1;

     if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
         return 0;

     if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PASSWORD)) != NULL)
         if (!pkcs12kdf_set_membuf(&ctx->pass, &ctx->pass_len, p))
             return 0;

     if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL)
         if (!pkcs12kdf_set_membuf(&ctx->salt, &ctx->salt_len, p))
             return 0;

     if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PKCS12_ID)) != NULL)
         if (!OSSL_PARAM_get_int(p, &ctx->id))
             return 0;

     if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_ITER)) != NULL)
         if (!OSSL_PARAM_get_uint64(p, &ctx->iter))
             return 0;
     return 1;
 }

 static const OSSL_PARAM *kdf_pkcs12_settable_ctx_params(
         ossl_unused void *ctx, ossl_unused void *provctx)
 {
     static const OSSL_PARAM known_settable_ctx_params[] = {
         OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
         OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
         OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PASSWORD, NULL, 0),
         OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
         OSSL_PARAM_uint64(OSSL_KDF_PARAM_ITER, NULL),
         OSSL_PARAM_int(OSSL_KDF_PARAM_PKCS12_ID, NULL),
         OSSL_PARAM_END
     };
     return known_settable_ctx_params;
 }

 static int kdf_pkcs12_get_ctx_params(void *vctx, OSSL_PARAM params[])
 {
     OSSL_PARAM *p;

     if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
         return OSSL_PARAM_set_size_t(p, SIZE_MAX);
     return -2;
 }

 static const OSSL_PARAM *kdf_pkcs12_gettable_ctx_params(
         ossl_unused void *ctx, ossl_unused void *provctx)
 {
     static const OSSL_PARAM known_gettable_ctx_params[] = {
         OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
         OSSL_PARAM_END
     };
     return known_gettable_ctx_params;
 }

 const OSSL_DISPATCH ossl_kdf_pkcs12_functions[] = {
     { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pkcs12_new },
     { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_pkcs12_dup },
     { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pkcs12_free },
     { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pkcs12_reset },
     { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pkcs12_derive },
     { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
       (void(*)(void))kdf_pkcs12_settable_ctx_params },
     { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pkcs12_set_ctx_params },
     { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
       (void(*)(void))kdf_pkcs12_gettable_ctx_params },
     { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pkcs12_get_ctx_params },
     { 0, NULL }
 };
	/*
	* Copyright 1999-2021 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
	*/

	#include <openssl/trace.h>
	#include <stdlib.h>
	#include <stdarg.h>
	#include <string.h>
	#include <openssl/evp.h>
	#include <openssl/kdf.h>
	#include <openssl/core_names.h>
	#include <openssl/proverr.h>
	#include "internal/cryptlib.h"
	#include "internal/numbers.h"
	#include "crypto/evp.h"
	#include "prov/provider_ctx.h"
	#include "prov/providercommon.h"
	#include "prov/implementations.h"
	#include "prov/provider_util.h"

	static OSSL_FUNC_kdf_newctx_fn kdf_pkcs12_new;
	static OSSL_FUNC_kdf_dupctx_fn kdf_pkcs12_dup;
	static OSSL_FUNC_kdf_freectx_fn kdf_pkcs12_free;
	static OSSL_FUNC_kdf_reset_fn kdf_pkcs12_reset;
	static OSSL_FUNC_kdf_derive_fn kdf_pkcs12_derive;
	static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pkcs12_settable_ctx_params;
	static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pkcs12_set_ctx_params;
	static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pkcs12_gettable_ctx_params;
	static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pkcs12_get_ctx_params;

	typedef struct {
	void *provctx;
	PROV_DIGEST digest;
	unsigned char *pass;
	size_t pass_len;
	unsigned char *salt;
	size_t salt_len;
	uint64_t iter;
	int id;
	} KDF_PKCS12;

	/* PKCS12 compatible key/IV generation */

	static int pkcs12kdf_derive(const unsigned char *pass, size_t passlen,
	const unsigned char *salt, size_t saltlen,
	int id, uint64_t iter, const EVP_MD *md_type,
	unsigned char *out, size_t n)
	{
	unsigned char B = NULL, D = NULL, I = NULL, p = NULL, *Ai = NULL;
	size_t Slen, Plen, Ilen;
	size_t i, j, k, u, v;
	uint64_t iter_cnt;
	int ret = 0, ui, vi;
	EVP_MD_CTX *ctx = NULL;

	ctx = EVP_MD_CTX_new();
	if (ctx == NULL) {
	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
	goto end;
	}
	vi = EVP_MD_get_block_size(md_type);
	ui = EVP_MD_get_size(md_type);
	if (ui <= 0 \|\| vi <= 0) {
	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_SIZE);
	goto end;
	}
	u = (size_t)ui;
	v = (size_t)vi;
	D = OPENSSL_malloc(v);
	Ai = OPENSSL_malloc(u);
	B = OPENSSL_malloc(v + 1);
	Slen = v * ((saltlen + v - 1) / v);
	if (passlen != 0)
	Plen = v * ((passlen + v - 1) / v);
	else
	Plen = 0;
	Ilen = Slen + Plen;
	I = OPENSSL_malloc(Ilen);
	if (D == NULL \|\| Ai == NULL \|\| B == NULL \|\| I == NULL) {
	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
	goto end;
	}
	for (i = 0; i < v; i++)
	D[i] = id;
	p = I;
	for (i = 0; i < Slen; i++)
	*p++ = salt[i % saltlen];
	for (i = 0; i < Plen; i++)
	*p++ = pass[i % passlen];
	for (;;) {
	if (!EVP_DigestInit_ex(ctx, md_type, NULL)
	\|\| !EVP_DigestUpdate(ctx, D, v)
	\|\| !EVP_DigestUpdate(ctx, I, Ilen)
	\|\| !EVP_DigestFinal_ex(ctx, Ai, NULL))
	goto end;
	for (iter_cnt = 1; iter_cnt < iter; iter_cnt++) {
	if (!EVP_DigestInit_ex(ctx, md_type, NULL)
	\|\| !EVP_DigestUpdate(ctx, Ai, u)
	\|\| !EVP_DigestFinal_ex(ctx, Ai, NULL))
	goto end;
	}
	memcpy(out, Ai, n < u ? n : u);
	if (u >= n) {
	ret = 1;
	break;
	}
	n -= u;
	out += u;
	for (j = 0; j < v; j++)
	B[j] = Ai[j % u];
	for (j = 0; j < Ilen; j += v) {
	unsigned char *Ij = I + j;
	uint16_t c = 1;

	/* Work out Ij = Ij + B + 1 */
	for (k = v; k > 0;) {
	k--;
	c += Ij[k] + B[k];
	Ij[k] = (unsigned char)c;
	c >>= 8;
	}
	}
	}

	end:
	OPENSSL_free(Ai);
	OPENSSL_free(B);
	OPENSSL_free(D);
	OPENSSL_free(I);
	EVP_MD_CTX_free(ctx);
	return ret;
	}

	static void kdf_pkcs12_new(void provctx)
	{
	KDF_PKCS12 *ctx;

	if (!ossl_prov_is_running())
	return NULL;

	ctx = OPENSSL_zalloc(sizeof(*ctx));
	if (ctx == NULL) {
	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
	return NULL;
	}
	ctx->provctx = provctx;
	return ctx;
	}

	static void kdf_pkcs12_cleanup(KDF_PKCS12 *ctx)
	{
	ossl_prov_digest_reset(&ctx->digest);
	OPENSSL_free(ctx->salt);
	OPENSSL_clear_free(ctx->pass, ctx->pass_len);
	memset(ctx, 0, sizeof(*ctx));
	}

	static void kdf_pkcs12_free(void *vctx)
	{
	KDF_PKCS12 ctx = (KDF_PKCS12 )vctx;

	if (ctx != NULL) {
	kdf_pkcs12_cleanup(ctx);
	OPENSSL_free(ctx);
	}
	}

	static void kdf_pkcs12_reset(void *vctx)
	{
	KDF_PKCS12 ctx = (KDF_PKCS12 )vctx;
	void *provctx = ctx->provctx;

	kdf_pkcs12_cleanup(ctx);
	ctx->provctx = provctx;
	}

	static void kdf_pkcs12_dup(void vctx)
	{
	const KDF_PKCS12 src = (const KDF_PKCS12 )vctx;
	KDF_PKCS12 *dest;

	dest = kdf_pkcs12_new(src->provctx);
	if (dest != NULL) {
	if (!ossl_prov_memdup(src->salt, src->salt_len,
	&dest->salt, &dest->salt_len)
	\|\| !ossl_prov_memdup(src->pass, src->pass_len,
	&dest->pass , &dest->pass_len)
	\|\| !ossl_prov_digest_copy(&dest->digest, &src->digest))
	goto err;
	dest->iter = src->iter;
	dest->id = src->id;
	}
	return dest;

	err:
	kdf_pkcs12_free(dest);
	return NULL;
	}

	static int pkcs12kdf_set_membuf(unsigned char *buffer, size_t buflen,
	const OSSL_PARAM *p)
	{
	OPENSSL_clear_free(buffer, buflen);
	*buffer = NULL;
	*buflen = 0;

	if (p->data_size == 0) {
	if ((*buffer = OPENSSL_malloc(1)) == NULL) {
	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
	return 0;
	}
	} else if (p->data != NULL) {
	if (!OSSL_PARAM_get_octet_string(p, (void **)buffer, 0, buflen))
	return 0;
	}
	return 1;
	}

	static int kdf_pkcs12_derive(void vctx, unsigned char key, size_t keylen,
	const OSSL_PARAM params[])
	{
	KDF_PKCS12 ctx = (KDF_PKCS12 )vctx;
	const EVP_MD *md;

	if (!ossl_prov_is_running() \|\| !kdf_pkcs12_set_ctx_params(ctx, params))
	return 0;

	if (ctx->pass == NULL) {
	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_PASS);
	return 0;
	}

	if (ctx->salt == NULL) {
	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SALT);
	return 0;
	}

	md = ossl_prov_digest_md(&ctx->digest);
	return pkcs12kdf_derive(ctx->pass, ctx->pass_len, ctx->salt, ctx->salt_len,
	ctx->id, ctx->iter, md, key, keylen);
	}

	static int kdf_pkcs12_set_ctx_params(void *vctx, const OSSL_PARAM params[])
	{
	const OSSL_PARAM *p;
	KDF_PKCS12 *ctx = vctx;
	OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);

	if (params == NULL)
	return 1;

	if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
	return 0;

	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PASSWORD)) != NULL)
	if (!pkcs12kdf_set_membuf(&ctx->pass, &ctx->pass_len, p))
	return 0;

	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL)
	if (!pkcs12kdf_set_membuf(&ctx->salt, &ctx->salt_len, p))
	return 0;

	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PKCS12_ID)) != NULL)
	if (!OSSL_PARAM_get_int(p, &ctx->id))
	return 0;

	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_ITER)) != NULL)
	if (!OSSL_PARAM_get_uint64(p, &ctx->iter))
	return 0;
	return 1;
	}

	static const OSSL_PARAM *kdf_pkcs12_settable_ctx_params(
	ossl_unused void ctx, ossl_unused void provctx)
	{
	static const OSSL_PARAM known_settable_ctx_params[] = {
	OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
	OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
	OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PASSWORD, NULL, 0),
	OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
	OSSL_PARAM_uint64(OSSL_KDF_PARAM_ITER, NULL),
	OSSL_PARAM_int(OSSL_KDF_PARAM_PKCS12_ID, NULL),
	OSSL_PARAM_END
	};
	return known_settable_ctx_params;
	}

	static int kdf_pkcs12_get_ctx_params(void *vctx, OSSL_PARAM params[])
	{
	OSSL_PARAM *p;

	if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
	return OSSL_PARAM_set_size_t(p, SIZE_MAX);
	return -2;
	}

	static const OSSL_PARAM *kdf_pkcs12_gettable_ctx_params(
	ossl_unused void ctx, ossl_unused void provctx)
	{
	static const OSSL_PARAM known_gettable_ctx_params[] = {
	OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
	OSSL_PARAM_END
	};
	return known_gettable_ctx_params;
	}

	const OSSL_DISPATCH ossl_kdf_pkcs12_functions[] = {
	{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pkcs12_new },
	{ OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_pkcs12_dup },
	{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pkcs12_free },
	{ OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pkcs12_reset },
	{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pkcs12_derive },
	{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
	(void(*)(void))kdf_pkcs12_settable_ctx_params },
	{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pkcs12_set_ctx_params },
	{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
	(void(*)(void))kdf_pkcs12_gettable_ctx_params },
	{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pkcs12_get_ctx_params },
	{ 0, NULL }
	};