/src/openssl30/providers/implementations/kdfs/pbkdf2.c

Source (jump to first uncovered line)
/*
 * Copyright 2018-2021 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
 */

/*
 * HMAC low level APIs are deprecated for public use, but still ok for internal
 * use.
 */
#include "internal/deprecated.h"

#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <openssl/hmac.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"
#include "pbkdf2.h"

/* Constants specified in SP800-132 */
#define KDF_PBKDF2_MIN_KEY_LEN_BITS  112
#define KDF_PBKDF2_MAX_KEY_LEN_DIGEST_RATIO 0xFFFFFFFF
#define KDF_PBKDF2_MIN_ITERATIONS 1000
#define KDF_PBKDF2_MIN_SALT_LEN   (128 / 8)

static OSSL_FUNC_kdf_newctx_fn kdf_pbkdf2_new;
static OSSL_FUNC_kdf_freectx_fn kdf_pbkdf2_free;
static OSSL_FUNC_kdf_reset_fn kdf_pbkdf2_reset;
static OSSL_FUNC_kdf_derive_fn kdf_pbkdf2_derive;
static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pbkdf2_settable_ctx_params;
static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pbkdf2_set_ctx_params;
static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pbkdf2_gettable_ctx_params;
static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pbkdf2_get_ctx_params;

static int  pbkdf2_derive(const char *pass, size_t passlen,
                          const unsigned char *salt, int saltlen, uint64_t iter,
                          const EVP_MD *digest, unsigned char *key,
                          size_t keylen, int extra_checks);

typedef struct {
    void *provctx;
    unsigned char *pass;
    size_t pass_len;
    unsigned char *salt;
    size_t salt_len;
    uint64_t iter;
    PROV_DIGEST digest;
    int lower_bound_checks;
} KDF_PBKDF2;

static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx);

static void *kdf_pbkdf2_new(void *provctx)
{
    KDF_PBKDF2 *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;
    kdf_pbkdf2_init(ctx);
    return ctx;
}

static void kdf_pbkdf2_cleanup(KDF_PBKDF2 *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_pbkdf2_free(void *vctx)
{
    KDF_PBKDF2 *ctx = (KDF_PBKDF2 *)vctx;

    if (ctx != NULL) {
        kdf_pbkdf2_cleanup(ctx);
        OPENSSL_free(ctx);
    }
}

static void kdf_pbkdf2_reset(void *vctx)
{
    KDF_PBKDF2 *ctx = (KDF_PBKDF2 *)vctx;
    void *provctx = ctx->provctx;

    kdf_pbkdf2_cleanup(ctx);
    ctx->provctx = provctx;
    kdf_pbkdf2_init(ctx);
}

static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx)
{
    OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
    OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);

    params[0] = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
                                                 SN_sha1, 0);
    if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
        /* This is an error, but there is no way to indicate such directly */
        ossl_prov_digest_reset(&ctx->digest);
    ctx->iter = PKCS5_DEFAULT_ITER;
    ctx->lower_bound_checks = ossl_kdf_pbkdf2_default_checks;
}

static int pbkdf2_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_pbkdf2_derive(void *vctx, unsigned char *key, size_t keylen,
                             const OSSL_PARAM params[])
{
    KDF_PBKDF2 *ctx = (KDF_PBKDF2 *)vctx;
    const EVP_MD *md;

    if (!ossl_prov_is_running() || !kdf_pbkdf2_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 pbkdf2_derive((char *)ctx->pass, ctx->pass_len,
                         ctx->salt, ctx->salt_len, ctx->iter,
                         md, key, keylen, ctx->lower_bound_checks);
}

static int kdf_pbkdf2_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
    const OSSL_PARAM *p;
    KDF_PBKDF2 *ctx = vctx;
    OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
    int pkcs5;
    uint64_t iter, min_iter;

    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_PKCS5)) != NULL) {
        if (!OSSL_PARAM_get_int(p, &pkcs5))
            return 0;
        ctx->lower_bound_checks = pkcs5 == 0;
    }

    if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PASSWORD)) != NULL)
        if (!pbkdf2_set_membuf(&ctx->pass, &ctx->pass_len, p))
            return 0;

    if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL) {
        if (ctx->lower_bound_checks != 0
            && p->data_size < KDF_PBKDF2_MIN_SALT_LEN) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
            return 0;
        }
        if (!pbkdf2_set_membuf(&ctx->salt, &ctx->salt_len,p))
            return 0;
    }

    if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_ITER)) != NULL) {
        if (!OSSL_PARAM_get_uint64(p, &iter))
            return 0;
        min_iter = ctx->lower_bound_checks != 0 ? KDF_PBKDF2_MIN_ITERATIONS : 1;
        if (iter < min_iter) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_ITERATION_COUNT);
            return 0;
        }
        ctx->iter = iter;
    }
    return 1;
}

static const OSSL_PARAM *kdf_pbkdf2_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_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_PKCS5, NULL),
        OSSL_PARAM_END
    };
    return known_settable_ctx_params;
}

static int kdf_pbkdf2_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_pbkdf2_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_pbkdf2_functions[] = {
    { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pbkdf2_new },
    { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pbkdf2_free },
    { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pbkdf2_reset },
    { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pbkdf2_derive },
    { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
      (void(*)(void))kdf_pbkdf2_settable_ctx_params },
    { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pbkdf2_set_ctx_params },
    { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
      (void(*)(void))kdf_pbkdf2_gettable_ctx_params },
    { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pbkdf2_get_ctx_params },
    { 0, NULL }
};

/*
 * This is an implementation of PKCS#5 v2.0 password based encryption key
 * derivation function PBKDF2. SHA1 version verified against test vectors
 * posted by Peter Gutmann to the PKCS-TNG mailing list.
 *
 * The constraints specified by SP800-132 have been added i.e.
 *  - Check the range of the key length.
 *  - Minimum iteration count of 1000.
 *  - Randomly-generated portion of the salt shall be at least 128 bits.
 */
static int pbkdf2_derive(const char *pass, size_t passlen,
                         const unsigned char *salt, int saltlen, uint64_t iter,
                         const EVP_MD *digest, unsigned char *key,
                         size_t keylen, int lower_bound_checks)
{
    int ret = 0;
    unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
    int cplen, k, tkeylen, mdlen;
    uint64_t j;
    unsigned long i = 1;
    HMAC_CTX *hctx_tpl = NULL, *hctx = NULL;

    mdlen = EVP_MD_get_size(digest);
    if (mdlen <= 0)
        return 0;

    /*
     * This check should always be done because keylen / mdlen >= (2^32 - 1)
     * results in an overflow of the loop counter 'i'.
     */
    if ((keylen / mdlen) >= KDF_PBKDF2_MAX_KEY_LEN_DIGEST_RATIO) {
        ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
        return 0;
    }

    if (lower_bound_checks) {
        if ((keylen * 8) < KDF_PBKDF2_MIN_KEY_LEN_BITS) {
            ERR_raise(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL);
            return 0;
        }
        if (saltlen < KDF_PBKDF2_MIN_SALT_LEN) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
            return 0;
        }
        if (iter < KDF_PBKDF2_MIN_ITERATIONS) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_ITERATION_COUNT);
            return 0;
        }
    }

    hctx_tpl = HMAC_CTX_new();
    if (hctx_tpl == NULL)
        return 0;
    p = key;
    tkeylen = keylen;
    if (!HMAC_Init_ex(hctx_tpl, pass, passlen, digest, NULL))
        goto err;
    hctx = HMAC_CTX_new();
    if (hctx == NULL)
        goto err;
    while (tkeylen) {
        if (tkeylen > mdlen)
            cplen = mdlen;
        else
            cplen = tkeylen;
        /*
         * We are unlikely to ever use more than 256 blocks (5120 bits!) but
         * just in case...
         */
        itmp[0] = (unsigned char)((i >> 24) & 0xff);
        itmp[1] = (unsigned char)((i >> 16) & 0xff);
        itmp[2] = (unsigned char)((i >> 8) & 0xff);
        itmp[3] = (unsigned char)(i & 0xff);
        if (!HMAC_CTX_copy(hctx, hctx_tpl))
            goto err;
        if (!HMAC_Update(hctx, salt, saltlen)
                || !HMAC_Update(hctx, itmp, 4)
                || !HMAC_Final(hctx, digtmp, NULL))
            goto err;
        memcpy(p, digtmp, cplen);
        for (j = 1; j < iter; j++) {
            if (!HMAC_CTX_copy(hctx, hctx_tpl))
                goto err;
            if (!HMAC_Update(hctx, digtmp, mdlen)
                    || !HMAC_Final(hctx, digtmp, NULL))
                goto err;
            for (k = 0; k < cplen; k++)
                p[k] ^= digtmp[k];
        }
        tkeylen -= cplen;
        i++;
        p += cplen;
    }
    ret = 1;

err:
    HMAC_CTX_free(hctx);
    HMAC_CTX_free(hctx_tpl);
    return ret;
}

Coverage Report

Created: 2023-09-25 06:41

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2018-2021 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		/*
11		* HMAC low level APIs are deprecated for public use, but still ok for internal
12		* use.
13		*/
14		#include "internal/deprecated.h"
15
16		#include <stdlib.h>
17		#include <stdarg.h>
18		#include <string.h>
19		#include <openssl/hmac.h>
20		#include <openssl/evp.h>
21		#include <openssl/kdf.h>
22		#include <openssl/core_names.h>
23		#include <openssl/proverr.h>
24		#include "internal/cryptlib.h"
25		#include "internal/numbers.h"
26		#include "crypto/evp.h"
27		#include "prov/provider_ctx.h"
28		#include "prov/providercommon.h"
29		#include "prov/implementations.h"
30		#include "prov/provider_util.h"
31		#include "pbkdf2.h"
32
33		/* Constants specified in SP800-132 */
34	0	#define KDF_PBKDF2_MIN_KEY_LEN_BITS 112
35	0	#define KDF_PBKDF2_MAX_KEY_LEN_DIGEST_RATIO 0xFFFFFFFF
36	0	#define KDF_PBKDF2_MIN_ITERATIONS 1000
37	0	#define KDF_PBKDF2_MIN_SALT_LEN (128 / 8)
38
39		static OSSL_FUNC_kdf_newctx_fn kdf_pbkdf2_new;
40		static OSSL_FUNC_kdf_freectx_fn kdf_pbkdf2_free;
41		static OSSL_FUNC_kdf_reset_fn kdf_pbkdf2_reset;
42		static OSSL_FUNC_kdf_derive_fn kdf_pbkdf2_derive;
43		static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pbkdf2_settable_ctx_params;
44		static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pbkdf2_set_ctx_params;
45		static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pbkdf2_gettable_ctx_params;
46		static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pbkdf2_get_ctx_params;
47
48		static int pbkdf2_derive(const char *pass, size_t passlen,
49		const unsigned char *salt, int saltlen, uint64_t iter,
50		const EVP_MD digest, unsigned char key,
51		size_t keylen, int extra_checks);
52
53		typedef struct {
54		void *provctx;
55		unsigned char *pass;
56		size_t pass_len;
57		unsigned char *salt;
58		size_t salt_len;
59		uint64_t iter;
60		PROV_DIGEST digest;
61		int lower_bound_checks;
62		} KDF_PBKDF2;
63
64		static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx);
65
66		static void kdf_pbkdf2_new(void provctx)
67	0	{
68	0	KDF_PBKDF2 *ctx;
69
70	0	if (!ossl_prov_is_running())
71	0	return NULL;
72
73	0	ctx = OPENSSL_zalloc(sizeof(*ctx));
74	0	if (ctx == NULL) {
75	0	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
76	0	return NULL;
77	0	}
78	0	ctx->provctx = provctx;
79	0	kdf_pbkdf2_init(ctx);
80	0	return ctx;
81	0	}
82
83		static void kdf_pbkdf2_cleanup(KDF_PBKDF2 *ctx)
84	0	{
85	0	ossl_prov_digest_reset(&ctx->digest);
86	0	OPENSSL_free(ctx->salt);
87	0	OPENSSL_clear_free(ctx->pass, ctx->pass_len);
88	0	memset(ctx, 0, sizeof(*ctx));
89	0	}
90
91		static void kdf_pbkdf2_free(void *vctx)
92	0	{
93	0	KDF_PBKDF2 ctx = (KDF_PBKDF2 )vctx;
94
95	0	if (ctx != NULL) {
96	0	kdf_pbkdf2_cleanup(ctx);
97	0	OPENSSL_free(ctx);
98	0	}
99	0	}
100
101		static void kdf_pbkdf2_reset(void *vctx)
102	0	{
103	0	KDF_PBKDF2 ctx = (KDF_PBKDF2 )vctx;
104	0	void *provctx = ctx->provctx;
105
106	0	kdf_pbkdf2_cleanup(ctx);
107	0	ctx->provctx = provctx;
108	0	kdf_pbkdf2_init(ctx);
109	0	}
110
111		static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx)
112	0	{
113	0	OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
114	0	OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
115
116	0	params[0] = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
117	0	SN_sha1, 0);
118	0	if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
119		/* This is an error, but there is no way to indicate such directly */
120	0	ossl_prov_digest_reset(&ctx->digest);
121	0	ctx->iter = PKCS5_DEFAULT_ITER;
122	0	ctx->lower_bound_checks = ossl_kdf_pbkdf2_default_checks;
123	0	}
124
125		static int pbkdf2_set_membuf(unsigned char *buffer, size_t buflen,
126		const OSSL_PARAM *p)
127	0	{
128	0	OPENSSL_clear_free(buffer, buflen);
129	0	*buffer = NULL;
130	0	*buflen = 0;
131
132	0	if (p->data_size == 0) {
133	0	if ((*buffer = OPENSSL_malloc(1)) == NULL) {
134	0	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
135	0	return 0;
136	0	}
137	0	} else if (p->data != NULL) {
138	0	if (!OSSL_PARAM_get_octet_string(p, (void **)buffer, 0, buflen))
139	0	return 0;
140	0	}
141	0	return 1;
142	0	}
143
144		static int kdf_pbkdf2_derive(void vctx, unsigned char key, size_t keylen,
145		const OSSL_PARAM params[])
146	0	{
147	0	KDF_PBKDF2 ctx = (KDF_PBKDF2 )vctx;
148	0	const EVP_MD *md;
149
150	0	if (!ossl_prov_is_running() \|\| !kdf_pbkdf2_set_ctx_params(ctx, params))
151	0	return 0;
152
153	0	if (ctx->pass == NULL) {
154	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_PASS);
155	0	return 0;
156	0	}
157
158	0	if (ctx->salt == NULL) {
159	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SALT);
160	0	return 0;
161	0	}
162
163	0	md = ossl_prov_digest_md(&ctx->digest);
164	0	return pbkdf2_derive((char *)ctx->pass, ctx->pass_len,
165	0	ctx->salt, ctx->salt_len, ctx->iter,
166	0	md, key, keylen, ctx->lower_bound_checks);
167	0	}
168
169		static int kdf_pbkdf2_set_ctx_params(void *vctx, const OSSL_PARAM params[])
170	0	{
171	0	const OSSL_PARAM *p;
172	0	KDF_PBKDF2 *ctx = vctx;
173	0	OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
174	0	int pkcs5;
175	0	uint64_t iter, min_iter;
176
177	0	if (params == NULL)
178	0	return 1;
179
180	0	if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
181	0	return 0;
182
183	0	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PKCS5)) != NULL) {
184	0	if (!OSSL_PARAM_get_int(p, &pkcs5))
185	0	return 0;
186	0	ctx->lower_bound_checks = pkcs5 == 0;
187	0	}
188
189	0	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PASSWORD)) != NULL)
190	0	if (!pbkdf2_set_membuf(&ctx->pass, &ctx->pass_len, p))
191	0	return 0;
192
193	0	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL) {
194	0	if (ctx->lower_bound_checks != 0
195	0	&& p->data_size < KDF_PBKDF2_MIN_SALT_LEN) {
196	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
197	0	return 0;
198	0	}
199	0	if (!pbkdf2_set_membuf(&ctx->salt, &ctx->salt_len,p))
200	0	return 0;
201	0	}
202
203	0	if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_ITER)) != NULL) {
204	0	if (!OSSL_PARAM_get_uint64(p, &iter))
205	0	return 0;
206	0	min_iter = ctx->lower_bound_checks != 0 ? KDF_PBKDF2_MIN_ITERATIONS : 1;
207	0	if (iter < min_iter) {
208	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_ITERATION_COUNT);
209	0	return 0;
210	0	}
211	0	ctx->iter = iter;
212	0	}
213	0	return 1;
214	0	}
215
216		static const OSSL_PARAM kdf_pbkdf2_settable_ctx_params(ossl_unused void ctx,
217		ossl_unused void *p_ctx)
218	0	{
219	0	static const OSSL_PARAM known_settable_ctx_params[] = {
220	0	OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
221	0	OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
222	0	OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PASSWORD, NULL, 0),
223	0	OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
224	0	OSSL_PARAM_uint64(OSSL_KDF_PARAM_ITER, NULL),
225	0	OSSL_PARAM_int(OSSL_KDF_PARAM_PKCS5, NULL),
226	0	OSSL_PARAM_END
227	0	};
228	0	return known_settable_ctx_params;
229	0	}
230
231		static int kdf_pbkdf2_get_ctx_params(void *vctx, OSSL_PARAM params[])
232	0	{
233	0	OSSL_PARAM *p;
234
235	0	if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
236	0	return OSSL_PARAM_set_size_t(p, SIZE_MAX);
237	0	return -2;
238	0	}
239
240		static const OSSL_PARAM kdf_pbkdf2_gettable_ctx_params(ossl_unused void ctx,
241		ossl_unused void *p_ctx)
242	0	{
243	0	static const OSSL_PARAM known_gettable_ctx_params[] = {
244	0	OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
245	0	OSSL_PARAM_END
246	0	};
247	0	return known_gettable_ctx_params;
248	0	}
249
250		const OSSL_DISPATCH ossl_kdf_pbkdf2_functions[] = {
251		{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pbkdf2_new },
252		{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pbkdf2_free },
253		{ OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pbkdf2_reset },
254		{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pbkdf2_derive },
255		{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
256		(void(*)(void))kdf_pbkdf2_settable_ctx_params },
257		{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pbkdf2_set_ctx_params },
258		{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
259		(void(*)(void))kdf_pbkdf2_gettable_ctx_params },
260		{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pbkdf2_get_ctx_params },
261		{ 0, NULL }
262		};
263
264		/*
265		* This is an implementation of PKCS#5 v2.0 password based encryption key
266		* derivation function PBKDF2. SHA1 version verified against test vectors
267		* posted by Peter Gutmann to the PKCS-TNG mailing list.
268		*
269		* The constraints specified by SP800-132 have been added i.e.
270		* - Check the range of the key length.
271		* - Minimum iteration count of 1000.
272		* - Randomly-generated portion of the salt shall be at least 128 bits.
273		*/
274		static int pbkdf2_derive(const char *pass, size_t passlen,
275		const unsigned char *salt, int saltlen, uint64_t iter,
276		const EVP_MD digest, unsigned char key,
277		size_t keylen, int lower_bound_checks)
278	0	{
279	0	int ret = 0;
280	0	unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
281	0	int cplen, k, tkeylen, mdlen;
282	0	uint64_t j;
283	0	unsigned long i = 1;
284	0	HMAC_CTX hctx_tpl = NULL, hctx = NULL;
285
286	0	mdlen = EVP_MD_get_size(digest);
287	0	if (mdlen <= 0)
288	0	return 0;
289
290		/*
291		* This check should always be done because keylen / mdlen >= (2^32 - 1)
292		* results in an overflow of the loop counter 'i'.
293		*/
294	0	if ((keylen / mdlen) >= KDF_PBKDF2_MAX_KEY_LEN_DIGEST_RATIO) {
295	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
296	0	return 0;
297	0	}
298
299	0	if (lower_bound_checks) {
300	0	if ((keylen * 8) < KDF_PBKDF2_MIN_KEY_LEN_BITS) {
301	0	ERR_raise(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL);
302	0	return 0;
303	0	}
304	0	if (saltlen < KDF_PBKDF2_MIN_SALT_LEN) {
305	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
306	0	return 0;
307	0	}
308	0	if (iter < KDF_PBKDF2_MIN_ITERATIONS) {
309	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_ITERATION_COUNT);
310	0	return 0;
311	0	}
312	0	}
313
314	0	hctx_tpl = HMAC_CTX_new();
315	0	if (hctx_tpl == NULL)
316	0	return 0;
317	0	p = key;
318	0	tkeylen = keylen;
319	0	if (!HMAC_Init_ex(hctx_tpl, pass, passlen, digest, NULL))
320	0	goto err;
321	0	hctx = HMAC_CTX_new();
322	0	if (hctx == NULL)
323	0	goto err;
324	0	while (tkeylen) {
325	0	if (tkeylen > mdlen)
326	0	cplen = mdlen;
327	0	else
328	0	cplen = tkeylen;
329		/*
330		* We are unlikely to ever use more than 256 blocks (5120 bits!) but
331		* just in case...
332		*/
333	0	itmp[0] = (unsigned char)((i >> 24) & 0xff);
334	0	itmp[1] = (unsigned char)((i >> 16) & 0xff);
335	0	itmp[2] = (unsigned char)((i >> 8) & 0xff);
336	0	itmp[3] = (unsigned char)(i & 0xff);
337	0	if (!HMAC_CTX_copy(hctx, hctx_tpl))
338	0	goto err;
339	0	if (!HMAC_Update(hctx, salt, saltlen)
340	0	\|\| !HMAC_Update(hctx, itmp, 4)
341	0	\|\| !HMAC_Final(hctx, digtmp, NULL))
342	0	goto err;
343	0	memcpy(p, digtmp, cplen);
344	0	for (j = 1; j < iter; j++) {
345	0	if (!HMAC_CTX_copy(hctx, hctx_tpl))
346	0	goto err;
347	0	if (!HMAC_Update(hctx, digtmp, mdlen)
348	0	\|\| !HMAC_Final(hctx, digtmp, NULL))
349	0	goto err;
350	0	for (k = 0; k < cplen; k++)
351	0	p[k] ^= digtmp[k];
352	0	}
353	0	tkeylen -= cplen;
354	0	i++;
355	0	p += cplen;
356	0	}
357	0	ret = 1;
358
359	0	err:
360	0	HMAC_CTX_free(hctx);
361	0	HMAC_CTX_free(hctx_tpl);
362	0	return ret;
363	0	}