/src/openssl30/providers/implementations/kdfs/sshkdf.c

Source (jump to first uncovered line)
/*
 * Copyright 2018-2022 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
 */

#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"

/* See RFC 4253, Section 7.2 */
static OSSL_FUNC_kdf_newctx_fn kdf_sshkdf_new;
static OSSL_FUNC_kdf_freectx_fn kdf_sshkdf_free;
static OSSL_FUNC_kdf_reset_fn kdf_sshkdf_reset;
static OSSL_FUNC_kdf_derive_fn kdf_sshkdf_derive;
static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_sshkdf_settable_ctx_params;
static OSSL_FUNC_kdf_set_ctx_params_fn kdf_sshkdf_set_ctx_params;
static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_sshkdf_gettable_ctx_params;
static OSSL_FUNC_kdf_get_ctx_params_fn kdf_sshkdf_get_ctx_params;

static int SSHKDF(const EVP_MD *evp_md,
                  const unsigned char *key, size_t key_len,
                  const unsigned char *xcghash, size_t xcghash_len,
                  const unsigned char *session_id, size_t session_id_len,
                  char type, unsigned char *okey, size_t okey_len);

typedef struct {
    void *provctx;
    PROV_DIGEST digest;
    unsigned char *key; /* K */
    size_t key_len;
    unsigned char *xcghash; /* H */
    size_t xcghash_len;
    char type; /* X */
    unsigned char *session_id;
    size_t session_id_len;
} KDF_SSHKDF;

static void *kdf_sshkdf_new(void *provctx)
{
    KDF_SSHKDF *ctx;

    if (!ossl_prov_is_running())
        return NULL;

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

static void kdf_sshkdf_free(void *vctx)
{
    KDF_SSHKDF *ctx = (KDF_SSHKDF *)vctx;

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

static void kdf_sshkdf_reset(void *vctx)
{
    KDF_SSHKDF *ctx = (KDF_SSHKDF *)vctx;
    void *provctx = ctx->provctx;

    ossl_prov_digest_reset(&ctx->digest);
    OPENSSL_clear_free(ctx->key, ctx->key_len);
    OPENSSL_clear_free(ctx->xcghash, ctx->xcghash_len);
    OPENSSL_clear_free(ctx->session_id, ctx->session_id_len);
    memset(ctx, 0, sizeof(*ctx));
    ctx->provctx = provctx;
}

static int sshkdf_set_membuf(unsigned char **dst, size_t *dst_len,
                             const OSSL_PARAM *p)
{
    OPENSSL_clear_free(*dst, *dst_len);
    *dst = NULL;
    *dst_len = 0;
    return OSSL_PARAM_get_octet_string(p, (void **)dst, 0, dst_len);
}

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

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

    md = ossl_prov_digest_md(&ctx->digest);
    if (md == NULL) {
        ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
        return 0;
    }
    if (ctx->key == NULL) {
        ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_KEY);
        return 0;
    }
    if (ctx->xcghash == NULL) {
        ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_XCGHASH);
        return 0;
    }
    if (ctx->session_id == NULL) {
        ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SESSION_ID);
        return 0;
    }
    if (ctx->type == 0) {
        ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_TYPE);
        return 0;
    }
    return SSHKDF(md, ctx->key, ctx->key_len,
                  ctx->xcghash, ctx->xcghash_len,
                  ctx->session_id, ctx->session_id_len,
                  ctx->type, key, keylen);
}

static int kdf_sshkdf_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
    const OSSL_PARAM *p;
    KDF_SSHKDF *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_KEY)) != NULL)
        if (!sshkdf_set_membuf(&ctx->key, &ctx->key_len, p))
            return 0;

    if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SSHKDF_XCGHASH))
        != NULL)
        if (!sshkdf_set_membuf(&ctx->xcghash, &ctx->xcghash_len, p))
            return 0;

    if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SSHKDF_SESSION_ID))
        != NULL)
        if (!sshkdf_set_membuf(&ctx->session_id, &ctx->session_id_len, p))
            return 0;

    if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SSHKDF_TYPE))
        != NULL) {
        const char *kdftype;

        if (!OSSL_PARAM_get_utf8_string_ptr(p, &kdftype))
            return 0;
        /* Expect one character (byte in this case) */
        if (kdftype == NULL || p->data_size != 1)
            return 0;
        if (kdftype[0] < 65 || kdftype[0] > 70) {
            ERR_raise(ERR_LIB_PROV, PROV_R_VALUE_ERROR);
            return 0;
        }
        ctx->type = kdftype[0];
    }
    return 1;
}

static const OSSL_PARAM *kdf_sshkdf_settable_ctx_params(ossl_unused void *ctx,
                                                        ossl_unused void *p_ctx)
{
    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_KEY, NULL, 0),
        OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SSHKDF_XCGHASH, NULL, 0),
        OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SSHKDF_SESSION_ID, NULL, 0),
        OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_SSHKDF_TYPE, NULL, 0),
        OSSL_PARAM_END
    };
    return known_settable_ctx_params;
}

static int kdf_sshkdf_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_sshkdf_gettable_ctx_params(ossl_unused void *ctx,
                                                        ossl_unused void *p_ctx)
{
    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_sshkdf_functions[] = {
    { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_sshkdf_new },
    { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_sshkdf_free },
    { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_sshkdf_reset },
    { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_sshkdf_derive },
    { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
      (void(*)(void))kdf_sshkdf_settable_ctx_params },
    { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_sshkdf_set_ctx_params },
    { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
      (void(*)(void))kdf_sshkdf_gettable_ctx_params },
    { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_sshkdf_get_ctx_params },
    { 0, NULL }
};

static int SSHKDF(const EVP_MD *evp_md,
                  const unsigned char *key, size_t key_len,
                  const unsigned char *xcghash, size_t xcghash_len,
                  const unsigned char *session_id, size_t session_id_len,
                  char type, unsigned char *okey, size_t okey_len)
{
    EVP_MD_CTX *md = NULL;
    unsigned char digest[EVP_MAX_MD_SIZE];
    unsigned int dsize = 0;
    size_t cursize = 0;
    int ret = 0;

    md = EVP_MD_CTX_new();
    if (md == NULL)
        return 0;

    if (!EVP_DigestInit_ex(md, evp_md, NULL))
        goto out;

    if (!EVP_DigestUpdate(md, key, key_len))
        goto out;

    if (!EVP_DigestUpdate(md, xcghash, xcghash_len))
        goto out;

    if (!EVP_DigestUpdate(md, &type, 1))
        goto out;

    if (!EVP_DigestUpdate(md, session_id, session_id_len))
        goto out;

    if (!EVP_DigestFinal_ex(md, digest, &dsize))
        goto out;

    if (okey_len < dsize) {
        memcpy(okey, digest, okey_len);
        ret = 1;
        goto out;
    }

    memcpy(okey, digest, dsize);

    for (cursize = dsize; cursize < okey_len; cursize += dsize) {

        if (!EVP_DigestInit_ex(md, evp_md, NULL))
            goto out;

        if (!EVP_DigestUpdate(md, key, key_len))
            goto out;

        if (!EVP_DigestUpdate(md, xcghash, xcghash_len))
            goto out;

        if (!EVP_DigestUpdate(md, okey, cursize))
            goto out;

        if (!EVP_DigestFinal_ex(md, digest, &dsize))
            goto out;

        if (okey_len < cursize + dsize) {
            memcpy(okey + cursize, digest, okey_len - cursize);
            ret = 1;
            goto out;
        }

        memcpy(okey + cursize, digest, dsize);
    }

    ret = 1;

out:
    EVP_MD_CTX_free(md);
    OPENSSL_cleanse(digest, EVP_MAX_MD_SIZE);
    return ret;
}


Coverage Report

Created: 2025-06-13 06:58

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2018-2022 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 <stdlib.h>
11		#include <stdarg.h>
12		#include <string.h>
13		#include <openssl/evp.h>
14		#include <openssl/kdf.h>
15		#include <openssl/core_names.h>
16		#include <openssl/proverr.h>
17		#include "internal/cryptlib.h"
18		#include "internal/numbers.h"
19		#include "crypto/evp.h"
20		#include "prov/provider_ctx.h"
21		#include "prov/providercommon.h"
22		#include "prov/implementations.h"
23		#include "prov/provider_util.h"
24
25		/* See RFC 4253, Section 7.2 */
26		static OSSL_FUNC_kdf_newctx_fn kdf_sshkdf_new;
27		static OSSL_FUNC_kdf_freectx_fn kdf_sshkdf_free;
28		static OSSL_FUNC_kdf_reset_fn kdf_sshkdf_reset;
29		static OSSL_FUNC_kdf_derive_fn kdf_sshkdf_derive;
30		static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_sshkdf_settable_ctx_params;
31		static OSSL_FUNC_kdf_set_ctx_params_fn kdf_sshkdf_set_ctx_params;
32		static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_sshkdf_gettable_ctx_params;
33		static OSSL_FUNC_kdf_get_ctx_params_fn kdf_sshkdf_get_ctx_params;
34
35		static int SSHKDF(const EVP_MD *evp_md,
36		const unsigned char *key, size_t key_len,
37		const unsigned char *xcghash, size_t xcghash_len,
38		const unsigned char *session_id, size_t session_id_len,
39		char type, unsigned char *okey, size_t okey_len);
40
41		typedef struct {
42		void *provctx;
43		PROV_DIGEST digest;
44		unsigned char key; / K */
45		size_t key_len;
46		unsigned char xcghash; / H */
47		size_t xcghash_len;
48		char type; /* X */
49		unsigned char *session_id;
50		size_t session_id_len;
51		} KDF_SSHKDF;
52
53		static void kdf_sshkdf_new(void provctx)
54	0	{
55	0	KDF_SSHKDF *ctx;
56
57	0	if (!ossl_prov_is_running())
58	0	return NULL;
59
60	0	if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
61	0	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
62	0	else
63	0	ctx->provctx = provctx;
64	0	return ctx;
65	0	}
66
67		static void kdf_sshkdf_free(void *vctx)
68	25	{
69	25	KDF_SSHKDF ctx = (KDF_SSHKDF )vctx;
70
71	25	if (ctx != NULL) {
72	25	kdf_sshkdf_reset(ctx);
73	25	OPENSSL_free(ctx);
74	25	}
75	25	}
76
77		static void kdf_sshkdf_reset(void *vctx)
78	25	{
79	25	KDF_SSHKDF ctx = (KDF_SSHKDF )vctx;
80	25	void *provctx = ctx->provctx;
81
82	25	ossl_prov_digest_reset(&ctx->digest);
83	25	OPENSSL_clear_free(ctx->key, ctx->key_len);
84	25	OPENSSL_clear_free(ctx->xcghash, ctx->xcghash_len);
85	25	OPENSSL_clear_free(ctx->session_id, ctx->session_id_len);
86	25	memset(ctx, 0, sizeof(*ctx));
87	25	ctx->provctx = provctx;
88	25	}
89
90		static int sshkdf_set_membuf(unsigned char *dst, size_t dst_len,
91		const OSSL_PARAM *p)
92	60	{
93	60	OPENSSL_clear_free(dst, dst_len);
94	60	*dst = NULL;
95	60	*dst_len = 0;
96	60	return OSSL_PARAM_get_octet_string(p, (void **)dst, 0, dst_len);
97	60	}
98
99		static int kdf_sshkdf_derive(void vctx, unsigned char key, size_t keylen,
100		const OSSL_PARAM params[])
101	0	{
102	0	KDF_SSHKDF ctx = (KDF_SSHKDF )vctx;
103	0	const EVP_MD *md;
104
105	0	if (!ossl_prov_is_running() \|\| !kdf_sshkdf_set_ctx_params(ctx, params))
106	0	return 0;
107
108	0	md = ossl_prov_digest_md(&ctx->digest);
109	0	if (md == NULL) {
110	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
111	0	return 0;
112	0	}
113	0	if (ctx->key == NULL) {
114	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_KEY);
115	0	return 0;
116	0	}
117	0	if (ctx->xcghash == NULL) {
118	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_XCGHASH);
119	0	return 0;
120	0	}
121	0	if (ctx->session_id == NULL) {
122	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SESSION_ID);
123	0	return 0;
124	0	}
125	0	if (ctx->type == 0) {
126	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_TYPE);
127	0	return 0;
128	0	}
129	0	return SSHKDF(md, ctx->key, ctx->key_len,
130	0	ctx->xcghash, ctx->xcghash_len,
131	0	ctx->session_id, ctx->session_id_len,
132	0	ctx->type, key, keylen);
133	0	}
134
135		static int kdf_sshkdf_set_ctx_params(void *vctx, const OSSL_PARAM params[])
136	0	{
137	0	const OSSL_PARAM *p;
138	0	KDF_SSHKDF *ctx = vctx;
139	0	OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
140
141	0	if (params == NULL)
142	0	return 1;
143
144	0	if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
145	0	return 0;
146
147	0	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY)) != NULL)
148	0	if (!sshkdf_set_membuf(&ctx->key, &ctx->key_len, p))
149	0	return 0;
150
151	0	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SSHKDF_XCGHASH))
152	0	!= NULL)
153	0	if (!sshkdf_set_membuf(&ctx->xcghash, &ctx->xcghash_len, p))
154	0	return 0;
155
156	0	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SSHKDF_SESSION_ID))
157	0	!= NULL)
158	0	if (!sshkdf_set_membuf(&ctx->session_id, &ctx->session_id_len, p))
159	0	return 0;
160
161	0	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SSHKDF_TYPE))
162	0	!= NULL) {
163	0	const char *kdftype;
164
165	0	if (!OSSL_PARAM_get_utf8_string_ptr(p, &kdftype))
166	0	return 0;
167		/* Expect one character (byte in this case) */
168	0	if (kdftype == NULL \|\| p->data_size != 1)
169	0	return 0;
170	0	if (kdftype[0] < 65 \|\| kdftype[0] > 70) {
171	0	ERR_raise(ERR_LIB_PROV, PROV_R_VALUE_ERROR);
172	0	return 0;
173	0	}
174	0	ctx->type = kdftype[0];
175	0	}
176	0	return 1;
177	0	}
178
179		static const OSSL_PARAM kdf_sshkdf_settable_ctx_params(ossl_unused void ctx,
180		ossl_unused void *p_ctx)
181	25	{
182	25	static const OSSL_PARAM known_settable_ctx_params[] = {
183	25	OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
184	25	OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
185	25	OSSL_PARAM_octet_string(OSSL_KDF_PARAM_KEY, NULL, 0),
186	25	OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SSHKDF_XCGHASH, NULL, 0),
187	25	OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SSHKDF_SESSION_ID, NULL, 0),
188	25	OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_SSHKDF_TYPE, NULL, 0),
189	25	OSSL_PARAM_END
190	25	};
191	25	return known_settable_ctx_params;
192	25	}
193
194		static int kdf_sshkdf_get_ctx_params(void *vctx, OSSL_PARAM params[])
195	0	{
196	0	OSSL_PARAM *p;
197
198	0	if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
199	0	return OSSL_PARAM_set_size_t(p, SIZE_MAX);
200	0	return -2;
201	0	}
202
203		static const OSSL_PARAM kdf_sshkdf_gettable_ctx_params(ossl_unused void ctx,
204		ossl_unused void *p_ctx)
205	0	{
206	0	static const OSSL_PARAM known_gettable_ctx_params[] = {
207	0	OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
208	0	OSSL_PARAM_END
209	0	};
210	0	return known_gettable_ctx_params;
211	0	}
212
213		const OSSL_DISPATCH ossl_kdf_sshkdf_functions[] = {
214		{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_sshkdf_new },
215		{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_sshkdf_free },
216		{ OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_sshkdf_reset },
217		{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_sshkdf_derive },
218		{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
219		(void(*)(void))kdf_sshkdf_settable_ctx_params },
220		{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_sshkdf_set_ctx_params },
221		{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
222		(void(*)(void))kdf_sshkdf_gettable_ctx_params },
223		{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_sshkdf_get_ctx_params },
224		{ 0, NULL }
225		};
226
227		static int SSHKDF(const EVP_MD *evp_md,
228		const unsigned char *key, size_t key_len,
229		const unsigned char *xcghash, size_t xcghash_len,
230		const unsigned char *session_id, size_t session_id_len,
231		char type, unsigned char *okey, size_t okey_len)
232	0	{
233	0	EVP_MD_CTX *md = NULL;
234	0	unsigned char digest[EVP_MAX_MD_SIZE];
235	0	unsigned int dsize = 0;
236	0	size_t cursize = 0;
237	0	int ret = 0;
238
239	0	md = EVP_MD_CTX_new();
240	0	if (md == NULL)
241	0	return 0;
242
243	0	if (!EVP_DigestInit_ex(md, evp_md, NULL))
244	0	goto out;
245
246	0	if (!EVP_DigestUpdate(md, key, key_len))
247	0	goto out;
248
249	0	if (!EVP_DigestUpdate(md, xcghash, xcghash_len))
250	0	goto out;
251
252	0	if (!EVP_DigestUpdate(md, &type, 1))
253	0	goto out;
254
255	0	if (!EVP_DigestUpdate(md, session_id, session_id_len))
256	0	goto out;
257
258	0	if (!EVP_DigestFinal_ex(md, digest, &dsize))
259	0	goto out;
260
261	0	if (okey_len < dsize) {
262	0	memcpy(okey, digest, okey_len);
263	0	ret = 1;
264	0	goto out;
265	0	}
266
267	0	memcpy(okey, digest, dsize);
268
269	0	for (cursize = dsize; cursize < okey_len; cursize += dsize) {
270
271	0	if (!EVP_DigestInit_ex(md, evp_md, NULL))
272	0	goto out;
273
274	0	if (!EVP_DigestUpdate(md, key, key_len))
275	0	goto out;
276
277	0	if (!EVP_DigestUpdate(md, xcghash, xcghash_len))
278	0	goto out;
279
280	0	if (!EVP_DigestUpdate(md, okey, cursize))
281	0	goto out;
282
283	0	if (!EVP_DigestFinal_ex(md, digest, &dsize))
284	0	goto out;
285
286	0	if (okey_len < cursize + dsize) {
287	0	memcpy(okey + cursize, digest, okey_len - cursize);
288	0	ret = 1;
289	0	goto out;
290	0	}
291
292	0	memcpy(okey + cursize, digest, dsize);
293	0	}
294
295	0	ret = 1;
296
297	0	out:
298	0	EVP_MD_CTX_free(md);
299	0	OPENSSL_cleanse(digest, EVP_MAX_MD_SIZE);
300	0	return ret;
301	0	}
302