/src/openssl/crypto/evp/dh_ctrl.c

Source (jump to first uncovered line)
/*
 * Copyright 2020-2021 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 "internal/deprecated.h"

#include <openssl/core_names.h>
#include <openssl/params.h>
#include <openssl/err.h>
#include <openssl/dh.h>
#include "crypto/dh.h"
#include "crypto/evp.h"

static int dh_paramgen_check(EVP_PKEY_CTX *ctx)
{
    if (ctx == NULL || !EVP_PKEY_CTX_IS_GEN_OP(ctx)) {
        ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
        /* Uses the same return values as EVP_PKEY_CTX_ctrl */
        return -2;
    }
    /* If key type not DH return error */
    if (evp_pkey_ctx_is_legacy(ctx)
        && ctx->pmeth->pkey_id != EVP_PKEY_DH
        && ctx->pmeth->pkey_id != EVP_PKEY_DHX)
        return -1;
    return 1;
}

static int dh_param_derive_check(EVP_PKEY_CTX *ctx)
{
    if (ctx == NULL || !EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
        ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
        /* Uses the same return values as EVP_PKEY_CTX_ctrl */
        return -2;
    }
    /* If key type not DH return error */
    if (evp_pkey_ctx_is_legacy(ctx)
        && ctx->pmeth->pkey_id != EVP_PKEY_DH
        && ctx->pmeth->pkey_id != EVP_PKEY_DHX)
        return -1;
    return 1;
}

int EVP_PKEY_CTX_set_dh_paramgen_gindex(EVP_PKEY_CTX *ctx, int gindex)
{
    int ret;
    OSSL_PARAM params[2], *p = params;

    if ((ret = dh_paramgen_check(ctx)) <= 0)
        return ret;

    *p++ = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_GINDEX, &gindex);
    *p = OSSL_PARAM_construct_end();

    return evp_pkey_ctx_set_params_strict(ctx, params);
}

int EVP_PKEY_CTX_set_dh_paramgen_seed(EVP_PKEY_CTX *ctx,
                                      const unsigned char *seed,
                                      size_t seedlen)
{
    int ret;
    OSSL_PARAM params[2], *p = params;

    if ((ret = dh_paramgen_check(ctx)) <= 0)
        return ret;

    *p++ = OSSL_PARAM_construct_octet_string(OSSL_PKEY_PARAM_FFC_SEED,
                                             (void *)seed, seedlen);
    *p = OSSL_PARAM_construct_end();

    return evp_pkey_ctx_set_params_strict(ctx, params);
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_set_dh_paramgen_type(EVP_PKEY_CTX *ctx, int typ)
{
    return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN,
                             EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL);
}

int EVP_PKEY_CTX_set_dh_paramgen_prime_len(EVP_PKEY_CTX *ctx, int pbits)
{
    int ret;
    OSSL_PARAM params[2], *p = params;
    size_t bits = pbits;

    if ((ret = dh_paramgen_check(ctx)) <= 0)
        return ret;

    *p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_PBITS, &bits);
    *p = OSSL_PARAM_construct_end();
    return evp_pkey_ctx_set_params_strict(ctx, params);
}

int EVP_PKEY_CTX_set_dh_paramgen_subprime_len(EVP_PKEY_CTX *ctx, int qbits)
{
    int ret;
    OSSL_PARAM params[2], *p = params;
    size_t bits2 = qbits;

    if ((ret = dh_paramgen_check(ctx)) <= 0)
        return ret;

    *p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_QBITS, &bits2);
    *p = OSSL_PARAM_construct_end();

    return evp_pkey_ctx_set_params_strict(ctx, params);
}

int EVP_PKEY_CTX_set_dh_paramgen_generator(EVP_PKEY_CTX *ctx, int gen)
{
    int ret;
    OSSL_PARAM params[2], *p = params;

    if ((ret = dh_paramgen_check(ctx)) <= 0)
        return ret;

    *p++ = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_DH_GENERATOR, &gen);
    *p = OSSL_PARAM_construct_end();

    return evp_pkey_ctx_set_params_strict(ctx, params);
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_set_dh_rfc5114(EVP_PKEY_CTX *ctx, int gen)
{
    return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN,
                             EVP_PKEY_CTRL_DH_RFC5114, gen, NULL);
}

int EVP_PKEY_CTX_set_dhx_rfc5114(EVP_PKEY_CTX *ctx, int gen)
{
    return EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen);
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_set_dh_nid(EVP_PKEY_CTX *ctx, int nid)
{
    return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH,
                             EVP_PKEY_OP_PARAMGEN | EVP_PKEY_OP_KEYGEN,
                             EVP_PKEY_CTRL_DH_NID, nid, NULL);
}

int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad)
{
    OSSL_PARAM dh_pad_params[2];
    unsigned int upad = pad;

    /* We use EVP_PKEY_CTX_ctrl return values */
    if (ctx == NULL || !EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
        ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
        return -2;
    }

    dh_pad_params[0] = OSSL_PARAM_construct_uint(OSSL_EXCHANGE_PARAM_PAD, &upad);
    dh_pad_params[1] = OSSL_PARAM_construct_end();

    return evp_pkey_ctx_set_params_strict(ctx, dh_pad_params);
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_set_dh_kdf_type(EVP_PKEY_CTX *ctx, int kdf)
{
    return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
                             EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL);
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_get_dh_kdf_type(EVP_PKEY_CTX *ctx)
{
    return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
                             EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL);
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_set0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT *oid)
{
    return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
                             EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)(oid));
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_get0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT **oid)
{
    return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
                             EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)(oid));
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_set_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
{
    return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
                             EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)(md));
}

/*
 * This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
 * simply because that's easier.
 */
int EVP_PKEY_CTX_get_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **pmd)
{
        return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
                                 EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)(pmd));
}

int EVP_PKEY_CTX_set_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int outlen)
{
    int ret;
    size_t len = outlen;
    OSSL_PARAM params[2], *p = params;

    ret = dh_param_derive_check(ctx);
    if (ret != 1)
        return ret;

    if (outlen <= 0) {
        /*
         * This would ideally be -1 or 0, but we have to retain compatibility
         * with legacy behaviour of EVP_PKEY_CTX_ctrl() which returned -2 if
         * inlen <= 0
         */
        return -2;
    }

    *p++ = OSSL_PARAM_construct_size_t(OSSL_EXCHANGE_PARAM_KDF_OUTLEN,
                                       &len);
    *p = OSSL_PARAM_construct_end();

    ret = evp_pkey_ctx_set_params_strict(ctx, params);
    if (ret == -2)
        ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
    return ret;
}

int EVP_PKEY_CTX_get_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int *plen)
{
    int ret;
    size_t len = UINT_MAX;
    OSSL_PARAM params[2], *p = params;

    ret = dh_param_derive_check(ctx);
    if (ret != 1)
        return ret;

    *p++ = OSSL_PARAM_construct_size_t(OSSL_EXCHANGE_PARAM_KDF_OUTLEN,
                                       &len);
    *p = OSSL_PARAM_construct_end();

    ret = evp_pkey_ctx_get_params_strict(ctx, params);
    if (ret == -2)
        ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
    if (ret != 1 || len > INT_MAX)
        return -1;

    *plen = (int)len;

    return 1;
}

int EVP_PKEY_CTX_set0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len)
{
    int ret;
    OSSL_PARAM params[2], *p = params;

    if (len < 0)
        return -1;

    ret = dh_param_derive_check(ctx);
    if (ret != 1)
        return ret;

    *p++ = OSSL_PARAM_construct_octet_string(OSSL_EXCHANGE_PARAM_KDF_UKM,
                                            /*
                                             * Cast away the const. This is read
                                             * only so should be safe
                                             */
                                            (void *)ukm,
                                            (size_t)len);
    *p = OSSL_PARAM_construct_end();

    ret = evp_pkey_ctx_set_params_strict(ctx, params);
    if (ret == -2)
        ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
    if (ret == 1)
        OPENSSL_free(ukm);
    return ret;
}

#ifndef OPENSSL_NO_DEPRECATED_3_0
int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **pukm)
{
    int ret;
    size_t ukmlen;
    OSSL_PARAM params[2], *p = params;

    ret = dh_param_derive_check(ctx);
    if (ret != 1)
        return ret;

    *p++ = OSSL_PARAM_construct_octet_ptr(OSSL_EXCHANGE_PARAM_KDF_UKM,
                                          (void **)pukm, 0);
    *p = OSSL_PARAM_construct_end();

    ret = evp_pkey_ctx_get_params_strict(ctx, params);
    if (ret == -2)
        ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
    if (ret != 1)
        return -1;

    ukmlen = params[0].return_size;
    if (ukmlen > INT_MAX)
        return -1;

    return (int)ukmlen;
}
#endif

Coverage Report

Created: 2025-06-13 06:36

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#include "internal/deprecated.h"
11
12		#include <openssl/core_names.h>
13		#include <openssl/params.h>
14		#include <openssl/err.h>
15		#include <openssl/dh.h>
16		#include "crypto/dh.h"
17		#include "crypto/evp.h"
18
19		static int dh_paramgen_check(EVP_PKEY_CTX *ctx)
20	0	{
21	0	if (ctx == NULL \|\| !EVP_PKEY_CTX_IS_GEN_OP(ctx)) {
22	0	ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
23		/* Uses the same return values as EVP_PKEY_CTX_ctrl */
24	0	return -2;
25	0	}
26		/* If key type not DH return error */
27	0	if (evp_pkey_ctx_is_legacy(ctx)
28	0	&& ctx->pmeth->pkey_id != EVP_PKEY_DH
29	0	&& ctx->pmeth->pkey_id != EVP_PKEY_DHX)
30	0	return -1;
31	0	return 1;
32	0	}
33
34		static int dh_param_derive_check(EVP_PKEY_CTX *ctx)
35	0	{
36	0	if (ctx == NULL \|\| !EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
37	0	ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
38		/* Uses the same return values as EVP_PKEY_CTX_ctrl */
39	0	return -2;
40	0	}
41		/* If key type not DH return error */
42	0	if (evp_pkey_ctx_is_legacy(ctx)
43	0	&& ctx->pmeth->pkey_id != EVP_PKEY_DH
44	0	&& ctx->pmeth->pkey_id != EVP_PKEY_DHX)
45	0	return -1;
46	0	return 1;
47	0	}
48
49		int EVP_PKEY_CTX_set_dh_paramgen_gindex(EVP_PKEY_CTX *ctx, int gindex)
50	0	{
51	0	int ret;
52	0	OSSL_PARAM params[2], *p = params;
53
54	0	if ((ret = dh_paramgen_check(ctx)) <= 0)
55	0	return ret;
56
57	0	*p++ = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_GINDEX, &gindex);
58	0	*p = OSSL_PARAM_construct_end();
59
60	0	return evp_pkey_ctx_set_params_strict(ctx, params);
61	0	}
62
63		int EVP_PKEY_CTX_set_dh_paramgen_seed(EVP_PKEY_CTX *ctx,
64		const unsigned char *seed,
65		size_t seedlen)
66	0	{
67	0	int ret;
68	0	OSSL_PARAM params[2], *p = params;
69
70	0	if ((ret = dh_paramgen_check(ctx)) <= 0)
71	0	return ret;
72
73	0	*p++ = OSSL_PARAM_construct_octet_string(OSSL_PKEY_PARAM_FFC_SEED,
74	0	(void *)seed, seedlen);
75	0	*p = OSSL_PARAM_construct_end();
76
77	0	return evp_pkey_ctx_set_params_strict(ctx, params);
78	0	}
79
80		/*
81		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
82		* simply because that's easier.
83		*/
84		int EVP_PKEY_CTX_set_dh_paramgen_type(EVP_PKEY_CTX *ctx, int typ)
85	0	{
86	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN,
87	0	EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL);
88	0	}
89
90		int EVP_PKEY_CTX_set_dh_paramgen_prime_len(EVP_PKEY_CTX *ctx, int pbits)
91	0	{
92	0	int ret;
93	0	OSSL_PARAM params[2], *p = params;
94	0	size_t bits = pbits;
95
96	0	if ((ret = dh_paramgen_check(ctx)) <= 0)
97	0	return ret;
98
99	0	*p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_PBITS, &bits);
100	0	*p = OSSL_PARAM_construct_end();
101	0	return evp_pkey_ctx_set_params_strict(ctx, params);
102	0	}
103
104		int EVP_PKEY_CTX_set_dh_paramgen_subprime_len(EVP_PKEY_CTX *ctx, int qbits)
105	0	{
106	0	int ret;
107	0	OSSL_PARAM params[2], *p = params;
108	0	size_t bits2 = qbits;
109
110	0	if ((ret = dh_paramgen_check(ctx)) <= 0)
111	0	return ret;
112
113	0	*p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_QBITS, &bits2);
114	0	*p = OSSL_PARAM_construct_end();
115
116	0	return evp_pkey_ctx_set_params_strict(ctx, params);
117	0	}
118
119		int EVP_PKEY_CTX_set_dh_paramgen_generator(EVP_PKEY_CTX *ctx, int gen)
120	0	{
121	0	int ret;
122	0	OSSL_PARAM params[2], *p = params;
123
124	0	if ((ret = dh_paramgen_check(ctx)) <= 0)
125	0	return ret;
126
127	0	*p++ = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_DH_GENERATOR, &gen);
128	0	*p = OSSL_PARAM_construct_end();
129
130	0	return evp_pkey_ctx_set_params_strict(ctx, params);
131	0	}
132
133		/*
134		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
135		* simply because that's easier.
136		*/
137		int EVP_PKEY_CTX_set_dh_rfc5114(EVP_PKEY_CTX *ctx, int gen)
138	0	{
139	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN,
140	0	EVP_PKEY_CTRL_DH_RFC5114, gen, NULL);
141	0	}
142
143		int EVP_PKEY_CTX_set_dhx_rfc5114(EVP_PKEY_CTX *ctx, int gen)
144	0	{
145	0	return EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen);
146	0	}
147
148		/*
149		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
150		* simply because that's easier.
151		*/
152		int EVP_PKEY_CTX_set_dh_nid(EVP_PKEY_CTX *ctx, int nid)
153	0	{
154	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH,
155	0	EVP_PKEY_OP_PARAMGEN \| EVP_PKEY_OP_KEYGEN,
156	0	EVP_PKEY_CTRL_DH_NID, nid, NULL);
157	0	}
158
159		int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad)
160	0	{
161	0	OSSL_PARAM dh_pad_params[2];
162	0	unsigned int upad = pad;
163
164		/* We use EVP_PKEY_CTX_ctrl return values */
165	0	if (ctx == NULL \|\| !EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
166	0	ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
167	0	return -2;
168	0	}
169
170	0	dh_pad_params[0] = OSSL_PARAM_construct_uint(OSSL_EXCHANGE_PARAM_PAD, &upad);
171	0	dh_pad_params[1] = OSSL_PARAM_construct_end();
172
173	0	return evp_pkey_ctx_set_params_strict(ctx, dh_pad_params);
174	0	}
175
176		/*
177		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
178		* simply because that's easier.
179		*/
180		int EVP_PKEY_CTX_set_dh_kdf_type(EVP_PKEY_CTX *ctx, int kdf)
181	0	{
182	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
183	0	EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL);
184	0	}
185
186		/*
187		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
188		* simply because that's easier.
189		*/
190		int EVP_PKEY_CTX_get_dh_kdf_type(EVP_PKEY_CTX *ctx)
191	0	{
192	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
193	0	EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL);
194	0	}
195
196		/*
197		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
198		* simply because that's easier.
199		*/
200		int EVP_PKEY_CTX_set0_dh_kdf_oid(EVP_PKEY_CTX ctx, ASN1_OBJECT oid)
201	0	{
202	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
203	0	EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)(oid));
204	0	}
205
206		/*
207		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
208		* simply because that's easier.
209		*/
210		int EVP_PKEY_CTX_get0_dh_kdf_oid(EVP_PKEY_CTX ctx, ASN1_OBJECT *oid)
211	0	{
212	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
213	0	EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)(oid));
214	0	}
215
216		/*
217		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
218		* simply because that's easier.
219		*/
220		int EVP_PKEY_CTX_set_dh_kdf_md(EVP_PKEY_CTX ctx, const EVP_MD md)
221	0	{
222	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
223	0	EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)(md));
224	0	}
225
226		/*
227		* This one is currently implemented as an EVP_PKEY_CTX_ctrl() wrapper,
228		* simply because that's easier.
229		*/
230		int EVP_PKEY_CTX_get_dh_kdf_md(EVP_PKEY_CTX ctx, const EVP_MD *pmd)
231	0	{
232	0	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_DERIVE,
233	0	EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)(pmd));
234	0	}
235
236		int EVP_PKEY_CTX_set_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int outlen)
237	0	{
238	0	int ret;
239	0	size_t len = outlen;
240	0	OSSL_PARAM params[2], *p = params;
241
242	0	ret = dh_param_derive_check(ctx);
243	0	if (ret != 1)
244	0	return ret;
245
246	0	if (outlen <= 0) {
247		/*
248		* This would ideally be -1 or 0, but we have to retain compatibility
249		* with legacy behaviour of EVP_PKEY_CTX_ctrl() which returned -2 if
250		* inlen <= 0
251		*/
252	0	return -2;
253	0	}
254
255	0	*p++ = OSSL_PARAM_construct_size_t(OSSL_EXCHANGE_PARAM_KDF_OUTLEN,
256	0	&len);
257	0	*p = OSSL_PARAM_construct_end();
258
259	0	ret = evp_pkey_ctx_set_params_strict(ctx, params);
260	0	if (ret == -2)
261	0	ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
262	0	return ret;
263	0	}
264
265		int EVP_PKEY_CTX_get_dh_kdf_outlen(EVP_PKEY_CTX ctx, int plen)
266	0	{
267	0	int ret;
268	0	size_t len = UINT_MAX;
269	0	OSSL_PARAM params[2], *p = params;
270
271	0	ret = dh_param_derive_check(ctx);
272	0	if (ret != 1)
273	0	return ret;
274
275	0	*p++ = OSSL_PARAM_construct_size_t(OSSL_EXCHANGE_PARAM_KDF_OUTLEN,
276	0	&len);
277	0	*p = OSSL_PARAM_construct_end();
278
279	0	ret = evp_pkey_ctx_get_params_strict(ctx, params);
280	0	if (ret == -2)
281	0	ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
282	0	if (ret != 1 \|\| len > INT_MAX)
283	0	return -1;
284
285	0	*plen = (int)len;
286
287	0	return 1;
288	0	}
289
290		int EVP_PKEY_CTX_set0_dh_kdf_ukm(EVP_PKEY_CTX ctx, unsigned char ukm, int len)
291	0	{
292	0	int ret;
293	0	OSSL_PARAM params[2], *p = params;
294
295	0	if (len < 0)
296	0	return -1;
297
298	0	ret = dh_param_derive_check(ctx);
299	0	if (ret != 1)
300	0	return ret;
301
302	0	*p++ = OSSL_PARAM_construct_octet_string(OSSL_EXCHANGE_PARAM_KDF_UKM,
303		/*
304		* Cast away the const. This is read
305		* only so should be safe
306		*/
307	0	(void *)ukm,
308	0	(size_t)len);
309	0	*p = OSSL_PARAM_construct_end();
310
311	0	ret = evp_pkey_ctx_set_params_strict(ctx, params);
312	0	if (ret == -2)
313	0	ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
314	0	if (ret == 1)
315	0	OPENSSL_free(ukm);
316	0	return ret;
317	0	}
318
319		#ifndef OPENSSL_NO_DEPRECATED_3_0
320		int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX ctx, unsigned char *pukm)
321	0	{
322	0	int ret;
323	0	size_t ukmlen;
324	0	OSSL_PARAM params[2], *p = params;
325
326	0	ret = dh_param_derive_check(ctx);
327	0	if (ret != 1)
328	0	return ret;
329
330	0	*p++ = OSSL_PARAM_construct_octet_ptr(OSSL_EXCHANGE_PARAM_KDF_UKM,
331	0	(void **)pukm, 0);
332	0	*p = OSSL_PARAM_construct_end();
333
334	0	ret = evp_pkey_ctx_get_params_strict(ctx, params);
335	0	if (ret == -2)
336	0	ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
337	0	if (ret != 1)
338	0	return -1;
339
340	0	ukmlen = params[0].return_size;
341	0	if (ukmlen > INT_MAX)
342	0	return -1;
343
344	0	return (int)ukmlen;
345	0	}
346		#endif