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

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/*
 * Copyright 2018-2024 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 "prov/securitycheck.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_dupctx_fn kdf_pbkdf2_dup;
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;

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;
    OSSL_FIPS_IND_DECLARE
} KDF_PBKDF2;

static int pbkdf2_derive(KDF_PBKDF2 *ctx, 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);

static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx);

static void *kdf_pbkdf2_new_no_init(void *provctx)
{
    KDF_PBKDF2 *ctx;

    if (!ossl_prov_is_running())
        return NULL;

    ctx = OPENSSL_zalloc(sizeof(*ctx));
    if (ctx == NULL)
        return NULL;
    ctx->provctx = provctx;
    OSSL_FIPS_IND_INIT(ctx);
    return ctx;
}

static void *kdf_pbkdf2_new(void *provctx)
{
    KDF_PBKDF2 *ctx = kdf_pbkdf2_new_no_init(provctx);

    if (ctx != NULL)
        kdf_pbkdf2_init(ctx);
    return ctx;
}

static void kdf_pbkdf2_cleanup(KDF_PBKDF2 *ctx)
{
    ossl_prov_digest_reset(&ctx->digest);
#ifdef OPENSSL_PEDANTIC_ZEROIZATION
    OPENSSL_clear_free(ctx->salt, ctx->salt_len);
#else
    OPENSSL_free(ctx->salt);
#endif
    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_dup(void *vctx)
{
    const KDF_PBKDF2 *src = (const KDF_PBKDF2 *)vctx;
    KDF_PBKDF2 *dest;

    /* We need a new PBKDF2 object but uninitialised since we're filling it */
    dest = kdf_pbkdf2_new_no_init(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->lower_bound_checks = src->lower_bound_checks;
        OSSL_FIPS_IND_COPY(dest, src)
    }
    return dest;

 err:
    kdf_pbkdf2_free(dest);
    return NULL;
}

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;
#ifdef FIPS_MODULE
    ctx->lower_bound_checks = 1;
#else
    ctx->lower_bound_checks = 0;
#endif
}

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

static int pbkdf2_lower_bound_check_passed(int saltlen, uint64_t iter,
                                           size_t keylen, int *error,
                                           const char **desc)
{
    if ((keylen * 8) < KDF_PBKDF2_MIN_KEY_LEN_BITS) {
        *error = PROV_R_KEY_SIZE_TOO_SMALL;
        if (desc != NULL)
            *desc = "Key size";
        return 0;
    }
    if (saltlen < KDF_PBKDF2_MIN_SALT_LEN) {
        *error = PROV_R_INVALID_SALT_LENGTH;
        if (desc != NULL)
            *desc = "Salt size";
        return 0;
    }
    if (iter < KDF_PBKDF2_MIN_ITERATIONS) {
        *error = PROV_R_INVALID_ITERATION_COUNT;
        if (desc != NULL)
            *desc = "Iteration count";
        return 0;
    }

    return 1;
}

#ifdef FIPS_MODULE
static int fips_lower_bound_check_passed(KDF_PBKDF2 *ctx, int saltlen,
                                         uint64_t iter, size_t keylen)
{
    OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
    int error = 0;
    const char *desc = NULL;
    int approved = pbkdf2_lower_bound_check_passed(saltlen, iter, keylen,
                                                   &error, &desc);

    if (!approved) {
        if (!OSSL_FIPS_IND_ON_UNAPPROVED(ctx, OSSL_FIPS_IND_SETTABLE0, libctx,
                                         "PBKDF2", desc,
                                         ossl_fips_config_pbkdf2_lower_bound_check)) {
            ERR_raise(ERR_LIB_PROV, error);
            return 0;
        }
    }
    return 1;
}
#endif

static int lower_bound_check_passed(KDF_PBKDF2 *ctx, int saltlen, uint64_t iter,
                                    size_t keylen, int lower_bound_checks)
{
#ifdef FIPS_MODULE
    if (!fips_lower_bound_check_passed(ctx, saltlen, iter, keylen))
        return 0;
#else
    if (lower_bound_checks) {
        int error = 0;
        int passed = pbkdf2_lower_bound_check_passed(saltlen, iter, keylen,
                                                     &error, NULL);

        if (!passed) {
            ERR_raise(ERR_LIB_PROV, error);
            return 0;
        }
    } else if (iter < 1) {
        ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_ITERATION_COUNT);
        return 0;
    }
#endif

    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(ctx, (char *)ctx->pass, ctx->pass_len,
                         ctx->salt, (int)ctx->salt_len, ctx->iter,
                         md, key, keylen, ctx->lower_bound_checks);
}

/* Machine generated by util/perl/OpenSSL/paramnames.pm */
#ifndef pbkdf2_set_ctx_params_list
static const OSSL_PARAM pbkdf2_set_ctx_params_list[] = {
    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
};
#endif

#ifndef pbkdf2_set_ctx_params_st
struct pbkdf2_set_ctx_params_st {
    OSSL_PARAM *digest;
    OSSL_PARAM *engine;
    OSSL_PARAM *iter;
    OSSL_PARAM *pkcs5;
    OSSL_PARAM *propq;
    OSSL_PARAM *pw;
    OSSL_PARAM *salt;
};
#endif

#ifndef pbkdf2_set_ctx_params_decoder
static int pbkdf2_set_ctx_params_decoder
    (const OSSL_PARAM *p, struct pbkdf2_set_ctx_params_st *r)
{
    const char *s;

    memset(r, 0, sizeof(*r));
    if (p != NULL)
        for (; (s = p->key) != NULL; p++)
            switch(s[0]) {
            default:
                break;
            case 'd':
                if (ossl_likely(strcmp("igest", s + 1) == 0)) {
                    if (ossl_unlikely(r->digest != NULL)) {
                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                       "param %s is repeated", s);
                        return 0;
                    }
                    r->digest = (OSSL_PARAM *)p;
                }
                break;
            case 'e':
                if (ossl_likely(strcmp("ngine", s + 1) == 0)) {
                    if (ossl_unlikely(r->engine != NULL)) {
                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                       "param %s is repeated", s);
                        return 0;
                    }
                    r->engine = (OSSL_PARAM *)p;
                }
                break;
            case 'i':
                if (ossl_likely(strcmp("ter", s + 1) == 0)) {
                    if (ossl_unlikely(r->iter != NULL)) {
                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                       "param %s is repeated", s);
                        return 0;
                    }
                    r->iter = (OSSL_PARAM *)p;
                }
                break;
            case 'p':
                switch(s[1]) {
                default:
                    break;
                case 'a':
                    if (ossl_likely(strcmp("ss", s + 2) == 0)) {
                        if (ossl_unlikely(r->pw != NULL)) {
                            ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                           "param %s is repeated", s);
                            return 0;
                        }
                        r->pw = (OSSL_PARAM *)p;
                    }
                    break;
                case 'k':
                    if (ossl_likely(strcmp("cs5", s + 2) == 0)) {
                        if (ossl_unlikely(r->pkcs5 != NULL)) {
                            ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                           "param %s is repeated", s);
                            return 0;
                        }
                        r->pkcs5 = (OSSL_PARAM *)p;
                    }
                    break;
                case 'r':
                    if (ossl_likely(strcmp("operties", s + 2) == 0)) {
                        if (ossl_unlikely(r->propq != NULL)) {
                            ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                           "param %s is repeated", s);
                            return 0;
                        }
                        r->propq = (OSSL_PARAM *)p;
                    }
                }
                break;
            case 's':
                if (ossl_likely(strcmp("alt", s + 1) == 0)) {
                    if (ossl_unlikely(r->salt != NULL)) {
                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                       "param %s is repeated", s);
                        return 0;
                    }
                    r->salt = (OSSL_PARAM *)p;
                }
            }
    return 1;
}
#endif
/* End of machine generated */

static int kdf_pbkdf2_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
    struct pbkdf2_set_ctx_params_st p;
    KDF_PBKDF2 *ctx = vctx;
    OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
    int pkcs5;
    uint64_t iter;
    const EVP_MD *md;

    if (!pbkdf2_set_ctx_params_decoder(params, &p))
        return 0;

    if (p.digest != NULL) {
        if (!ossl_prov_digest_load(&ctx->digest, p.digest,
                                   p.propq, p.engine, provctx))
            return 0;
        md = ossl_prov_digest_md(&ctx->digest);
        if (EVP_MD_xof(md)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED);
            return 0;
        }
    }

    if (p.pkcs5 != NULL) {
        if (!OSSL_PARAM_get_int(p.pkcs5, &pkcs5))
            return 0;
        ctx->lower_bound_checks = pkcs5 == 0;
#ifdef FIPS_MODULE
        ossl_FIPS_IND_set_settable(OSSL_FIPS_IND_GET(ctx),
                                   OSSL_FIPS_IND_SETTABLE0,
                                   ctx->lower_bound_checks);
#endif
    }

    if (p.pw != NULL && !pbkdf2_set_membuf(&ctx->pass, &ctx->pass_len, p.pw))
            return 0;

    if (p.salt != NULL) {
        if (!lower_bound_check_passed(ctx, (int)p.salt->data_size, UINT64_MAX, SIZE_MAX,
                                      ctx->lower_bound_checks))
            return 0;
        if (!pbkdf2_set_membuf(&ctx->salt, &ctx->salt_len, p.salt))
            return 0;
    }

    if (p.iter != NULL) {
        if (!OSSL_PARAM_get_uint64(p.iter, &iter))
            return 0;
        if (!lower_bound_check_passed(ctx, INT_MAX, iter, SIZE_MAX,
                                      ctx->lower_bound_checks))
            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)
{
    return pbkdf2_set_ctx_params_list;
}

/* Machine generated by util/perl/OpenSSL/paramnames.pm */
#ifndef pbkdf2_get_ctx_params_list
static const OSSL_PARAM pbkdf2_get_ctx_params_list[] = {
    OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
# if defined(FIPS_MODULE)
    OSSL_PARAM_int(OSSL_KDF_PARAM_FIPS_APPROVED_INDICATOR, NULL),
# endif
    OSSL_PARAM_END
};
#endif

#ifndef pbkdf2_get_ctx_params_st
struct pbkdf2_get_ctx_params_st {
# if defined(FIPS_MODULE)
    OSSL_PARAM *ind;
# endif
    OSSL_PARAM *size;
};
#endif

#ifndef pbkdf2_get_ctx_params_decoder
static int pbkdf2_get_ctx_params_decoder
    (const OSSL_PARAM *p, struct pbkdf2_get_ctx_params_st *r)
{
    const char *s;

    memset(r, 0, sizeof(*r));
    if (p != NULL)
        for (; (s = p->key) != NULL; p++)
            switch(s[0]) {
            default:
                break;
            case 'f':
# if defined(FIPS_MODULE)
                if (ossl_likely(strcmp("ips-indicator", s + 1) == 0)) {
                    if (ossl_unlikely(r->ind != NULL)) {
                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                       "param %s is repeated", s);
                        return 0;
                    }
                    r->ind = (OSSL_PARAM *)p;
                }
# endif
                break;
            case 's':
                if (ossl_likely(strcmp("ize", s + 1) == 0)) {
                    if (ossl_unlikely(r->size != NULL)) {
                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
                                       "param %s is repeated", s);
                        return 0;
                    }
                    r->size = (OSSL_PARAM *)p;
                }
            }
    return 1;
}
#endif
/* End of machine generated */

static int kdf_pbkdf2_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
    KDF_PBKDF2 *ctx = vctx;
    struct pbkdf2_get_ctx_params_st p;

    if (ctx == NULL || !pbkdf2_get_ctx_params_decoder(params, &p))
        return 0;

    if (p.size != NULL && !OSSL_PARAM_set_size_t(p.size, SIZE_MAX))
            return 0;

    if (!OSSL_FIPS_IND_GET_CTX_FROM_PARAM(ctx, p.ind))
        return 0;
    return 1;
}

static const OSSL_PARAM *kdf_pbkdf2_gettable_ctx_params(ossl_unused void *ctx,
                                                        ossl_unused void *p_ctx)
{
    return pbkdf2_get_ctx_params_list;
}

const OSSL_DISPATCH ossl_kdf_pbkdf2_functions[] = {
    { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pbkdf2_new },
    { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_pbkdf2_dup },
    { 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 },
    OSSL_DISPATCH_END
};

/*
 * 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(KDF_PBKDF2 *ctx, 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_check_passed(ctx, saltlen, iter, keylen, lower_bound_checks))
        return 0;

    hctx_tpl = HMAC_CTX_new();
    if (hctx_tpl == NULL)
        return 0;
    p = key;
    tkeylen = (int)keylen;
    if (!HMAC_Init_ex(hctx_tpl, pass, (int)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: 2025-08-11 07:04

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2018-2024 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		/*
12		* HMAC low level APIs are deprecated for public use, but still ok for internal
13		* use.
14		*/
15		#include "internal/deprecated.h"
16
17		#include <stdlib.h>
18		#include <stdarg.h>
19		#include <string.h>
20		#include <openssl/hmac.h>
21		#include <openssl/evp.h>
22		#include <openssl/kdf.h>
23		#include <openssl/core_names.h>
24		#include <openssl/proverr.h>
25		#include "internal/cryptlib.h"
26		#include "internal/numbers.h"
27		#include "crypto/evp.h"
28		#include "prov/provider_ctx.h"
29		#include "prov/providercommon.h"
30		#include "prov/implementations.h"
31		#include "prov/provider_util.h"
32		#include "prov/securitycheck.h"
33
34		/* Constants specified in SP800-132 */
35	25	#define KDF_PBKDF2_MIN_KEY_LEN_BITS 112
36	55	#define KDF_PBKDF2_MAX_KEY_LEN_DIGEST_RATIO 0xFFFFFFFF
37	2	#define KDF_PBKDF2_MIN_ITERATIONS 1000
38	25	#define KDF_PBKDF2_MIN_SALT_LEN (128 / 8)
39
40		static OSSL_FUNC_kdf_newctx_fn kdf_pbkdf2_new;
41		static OSSL_FUNC_kdf_dupctx_fn kdf_pbkdf2_dup;
42		static OSSL_FUNC_kdf_freectx_fn kdf_pbkdf2_free;
43		static OSSL_FUNC_kdf_reset_fn kdf_pbkdf2_reset;
44		static OSSL_FUNC_kdf_derive_fn kdf_pbkdf2_derive;
45		static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pbkdf2_settable_ctx_params;
46		static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pbkdf2_set_ctx_params;
47		static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pbkdf2_gettable_ctx_params;
48		static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pbkdf2_get_ctx_params;
49
50		typedef struct {
51		void *provctx;
52		unsigned char *pass;
53		size_t pass_len;
54		unsigned char *salt;
55		size_t salt_len;
56		uint64_t iter;
57		PROV_DIGEST digest;
58		int lower_bound_checks;
59		OSSL_FIPS_IND_DECLARE
60		} KDF_PBKDF2;
61
62		static int pbkdf2_derive(KDF_PBKDF2 ctx, const char pass, size_t passlen,
63		const unsigned char *salt, int saltlen, uint64_t iter,
64		const EVP_MD digest, unsigned char key,
65		size_t keylen, int lower_bound_checks);
66
67		static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx);
68
69		static void kdf_pbkdf2_new_no_init(void provctx)
70	236	{
71	236	KDF_PBKDF2 *ctx;
72
73	236	if (!ossl_prov_is_running())
74	0	return NULL;
75
76	236	ctx = OPENSSL_zalloc(sizeof(*ctx));
77	236	if (ctx == NULL)
78	0	return NULL;
79	236	ctx->provctx = provctx;
80	236	OSSL_FIPS_IND_INIT(ctx);
81	236	return ctx;
82	236	}
83
84		static void kdf_pbkdf2_new(void provctx)
85	236	{
86	236	KDF_PBKDF2 *ctx = kdf_pbkdf2_new_no_init(provctx);
87
88	236	if (ctx != NULL)
89	236	kdf_pbkdf2_init(ctx);
90	236	return ctx;
91	236	}
92
93		static void kdf_pbkdf2_cleanup(KDF_PBKDF2 *ctx)
94	236	{
95	236	ossl_prov_digest_reset(&ctx->digest);
96		#ifdef OPENSSL_PEDANTIC_ZEROIZATION
97		OPENSSL_clear_free(ctx->salt, ctx->salt_len);
98		#else
99	236	OPENSSL_free(ctx->salt);
100	236	#endif
101	236	OPENSSL_clear_free(ctx->pass, ctx->pass_len);
102	236	memset(ctx, 0, sizeof(*ctx));
103	236	}
104
105		static void kdf_pbkdf2_free(void *vctx)
106	236	{
107	236	KDF_PBKDF2 ctx = (KDF_PBKDF2 )vctx;
108
109	236	if (ctx != NULL) {
110	236	kdf_pbkdf2_cleanup(ctx);
111	236	OPENSSL_free(ctx);
112	236	}
113	236	}
114
115		static void kdf_pbkdf2_reset(void *vctx)
116	0	{
117	0	KDF_PBKDF2 ctx = (KDF_PBKDF2 )vctx;
118	0	void *provctx = ctx->provctx;
119
120	0	kdf_pbkdf2_cleanup(ctx);
121	0	ctx->provctx = provctx;
122	0	kdf_pbkdf2_init(ctx);
123	0	}
124
125		static void kdf_pbkdf2_dup(void vctx)
126	0	{
127	0	const KDF_PBKDF2 src = (const KDF_PBKDF2 )vctx;
128	0	KDF_PBKDF2 *dest;
129
130		/* We need a new PBKDF2 object but uninitialised since we're filling it */
131	0	dest = kdf_pbkdf2_new_no_init(src->provctx);
132	0	if (dest != NULL) {
133	0	if (!ossl_prov_memdup(src->salt, src->salt_len,
134	0	&dest->salt, &dest->salt_len)
135	0	\|\| !ossl_prov_memdup(src->pass, src->pass_len,
136	0	&dest->pass, &dest->pass_len)
137	0	\|\| !ossl_prov_digest_copy(&dest->digest, &src->digest))
138	0	goto err;
139	0	dest->iter = src->iter;
140	0	dest->lower_bound_checks = src->lower_bound_checks;
141	0	OSSL_FIPS_IND_COPY(dest, src)
142	0	}
143	0	return dest;
144
145	0	err:
146	0	kdf_pbkdf2_free(dest);
147	0	return NULL;
148	0	}
149
150		static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx)
151	236	{
152	236	OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
153	236	OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
154
155	236	params[0] = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
156	236	SN_sha1, 0);
157	236	if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
158		/* This is an error, but there is no way to indicate such directly */
159	0	ossl_prov_digest_reset(&ctx->digest);
160	236	ctx->iter = PKCS5_DEFAULT_ITER;
161		#ifdef FIPS_MODULE
162		ctx->lower_bound_checks = 1;
163		#else
164	236	ctx->lower_bound_checks = 0;
165	236	#endif
166	236	}
167
168		static int pbkdf2_set_membuf(unsigned char *buffer, size_t buflen,
169		const OSSL_PARAM *p)
170	382	{
171	382	OPENSSL_clear_free(buffer, buflen);
172	382	*buffer = NULL;
173	382	*buflen = 0;
174
175	382	if (p->data_size == 0) {
176	119	if ((*buffer = OPENSSL_malloc(1)) == NULL)
177	0	return 0;
178	263	} else if (p->data != NULL) {
179	263	if (!OSSL_PARAM_get_octet_string(p, (void **)buffer, 0, buflen))
180	0	return 0;
181	263	}
182	382	return 1;
183	382	}
184
185		static int pbkdf2_lower_bound_check_passed(int saltlen, uint64_t iter,
186		size_t keylen, int *error,
187		const char **desc)
188	25	{
189	25	if ((keylen * 8) < KDF_PBKDF2_MIN_KEY_LEN_BITS) {
190	0	*error = PROV_R_KEY_SIZE_TOO_SMALL;
191	0	if (desc != NULL)
192	0	*desc = "Key size";
193	0	return 0;
194	0	}
195	25	if (saltlen < KDF_PBKDF2_MIN_SALT_LEN) {
196	23	*error = PROV_R_INVALID_SALT_LENGTH;
197	23	if (desc != NULL)
198	0	*desc = "Salt size";
199	23	return 0;
200	23	}
201	2	if (iter < KDF_PBKDF2_MIN_ITERATIONS) {
202	1	*error = PROV_R_INVALID_ITERATION_COUNT;
203	1	if (desc != NULL)
204	0	*desc = "Iteration count";
205	1	return 0;
206	1	}
207
208	1	return 1;
209	2	}
210
211		#ifdef FIPS_MODULE
212		static int fips_lower_bound_check_passed(KDF_PBKDF2 *ctx, int saltlen,
213		uint64_t iter, size_t keylen)
214		{
215		OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
216		int error = 0;
217		const char *desc = NULL;
218		int approved = pbkdf2_lower_bound_check_passed(saltlen, iter, keylen,
219		&error, &desc);
220
221		if (!approved) {
222		if (!OSSL_FIPS_IND_ON_UNAPPROVED(ctx, OSSL_FIPS_IND_SETTABLE0, libctx,
223		"PBKDF2", desc,
224		ossl_fips_config_pbkdf2_lower_bound_check)) {
225		ERR_raise(ERR_LIB_PROV, error);
226		return 0;
227		}
228		}
229		return 1;
230		}
231		#endif
232
233		static int lower_bound_check_passed(KDF_PBKDF2 *ctx, int saltlen, uint64_t iter,
234		size_t keylen, int lower_bound_checks)
235	192	{
236		#ifdef FIPS_MODULE
237		if (!fips_lower_bound_check_passed(ctx, saltlen, iter, keylen))
238		return 0;
239		#else
240	192	if (lower_bound_checks) {
241	25	int error = 0;
242	25	int passed = pbkdf2_lower_bound_check_passed(saltlen, iter, keylen,
243	25	&error, NULL);
244
245	25	if (!passed) {
246	24	ERR_raise(ERR_LIB_PROV, error);
247	24	return 0;
248	24	}
249	167	} else if (iter < 1) {
250	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_ITERATION_COUNT);
251	0	return 0;
252	0	}
253	168	#endif
254
255	168	return 1;
256	192	}
257
258		static int kdf_pbkdf2_derive(void vctx, unsigned char key, size_t keylen,
259		const OSSL_PARAM params[])
260	166	{
261	166	KDF_PBKDF2 ctx = (KDF_PBKDF2 )vctx;
262	166	const EVP_MD *md;
263
264	166	if (!ossl_prov_is_running() \|\| !kdf_pbkdf2_set_ctx_params(ctx, params))
265	0	return 0;
266
267	166	if (ctx->pass == NULL) {
268	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_PASS);
269	0	return 0;
270	0	}
271
272	166	if (ctx->salt == NULL) {
273	0	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SALT);
274	0	return 0;
275	0	}
276
277	166	md = ossl_prov_digest_md(&ctx->digest);
278	166	return pbkdf2_derive(ctx, (char *)ctx->pass, ctx->pass_len,
279	166	ctx->salt, (int)ctx->salt_len, ctx->iter,
280	166	md, key, keylen, ctx->lower_bound_checks);
281	166	}
282
283		/* Machine generated by util/perl/OpenSSL/paramnames.pm */
284		#ifndef pbkdf2_set_ctx_params_list
285		static const OSSL_PARAM pbkdf2_set_ctx_params_list[] = {
286		OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
287		OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
288		OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PASSWORD, NULL, 0),
289		OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
290		OSSL_PARAM_uint64(OSSL_KDF_PARAM_ITER, NULL),
291		OSSL_PARAM_int(OSSL_KDF_PARAM_PKCS5, NULL),
292		OSSL_PARAM_END
293		};
294		#endif
295
296		#ifndef pbkdf2_set_ctx_params_st
297		struct pbkdf2_set_ctx_params_st {
298		OSSL_PARAM *digest;
299		OSSL_PARAM *engine;
300		OSSL_PARAM *iter;
301		OSSL_PARAM *pkcs5;
302		OSSL_PARAM *propq;
303		OSSL_PARAM *pw;
304		OSSL_PARAM *salt;
305		};
306		#endif
307
308		#ifndef pbkdf2_set_ctx_params_decoder
309		static int pbkdf2_set_ctx_params_decoder
310		(const OSSL_PARAM p, struct pbkdf2_set_ctx_params_st r)
311	147	{
312	147	const char *s;
313
314	147	memset(r, 0, sizeof(*r));
315	147	if (p != NULL)
316	637	for (; (s = p->key) != NULL; p++)
317	546	switch(s[0]) {
318	0	default:
319	0	break;
320	91	case 'd':
321	91	if (ossl_likely(strcmp("igest", s + 1) == 0)) {
322	91	if (ossl_unlikely(r->digest != NULL)) {
323	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
324	0	"param %s is repeated", s);
325	0	return 0;
326	0	}
327	91	r->digest = (OSSL_PARAM *)p;
328	91	}
329	91	break;
330	91	case 'e':
331	0	if (ossl_likely(strcmp("ngine", s + 1) == 0)) {
332	0	if (ossl_unlikely(r->engine != NULL)) {
333	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
334	0	"param %s is repeated", s);
335	0	return 0;
336	0	}
337	0	r->engine = (OSSL_PARAM *)p;
338	0	}
339	0	break;
340	91	case 'i':
341	91	if (ossl_likely(strcmp("ter", s + 1) == 0)) {
342	91	if (ossl_unlikely(r->iter != NULL)) {
343	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
344	0	"param %s is repeated", s);
345	0	return 0;
346	0	}
347	91	r->iter = (OSSL_PARAM *)p;
348	91	}
349	91	break;
350	273	case 'p':
351	273	switch(s[1]) {
352	0	default:
353	0	break;
354	91	case 'a':
355	91	if (ossl_likely(strcmp("ss", s + 2) == 0)) {
356	91	if (ossl_unlikely(r->pw != NULL)) {
357	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
358	0	"param %s is repeated", s);
359	0	return 0;
360	0	}
361	91	r->pw = (OSSL_PARAM *)p;
362	91	}
363	91	break;
364	91	case 'k':
365	91	if (ossl_likely(strcmp("cs5", s + 2) == 0)) {
366	91	if (ossl_unlikely(r->pkcs5 != NULL)) {
367	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
368	0	"param %s is repeated", s);
369	0	return 0;
370	0	}
371	91	r->pkcs5 = (OSSL_PARAM *)p;
372	91	}
373	91	break;
374	91	case 'r':
375	91	if (ossl_likely(strcmp("operties", s + 2) == 0)) {
376	91	if (ossl_unlikely(r->propq != NULL)) {
377	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
378	0	"param %s is repeated", s);
379	0	return 0;
380	0	}
381	91	r->propq = (OSSL_PARAM *)p;
382	91	}
383	273	}
384	273	break;
385	273	case 's':
386	91	if (ossl_likely(strcmp("alt", s + 1) == 0)) {
387	91	if (ossl_unlikely(r->salt != NULL)) {
388	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
389	0	"param %s is repeated", s);
390	0	return 0;
391	0	}
392	91	r->salt = (OSSL_PARAM *)p;
393	91	}
394	546	}
395	147	return 1;
396	147	}
397		#endif
398		/* End of machine generated */
399
400		static int kdf_pbkdf2_set_ctx_params(void *vctx, const OSSL_PARAM params[])
401	147	{
402	147	struct pbkdf2_set_ctx_params_st p;
403	147	KDF_PBKDF2 *ctx = vctx;
404	147	OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
405	147	int pkcs5;
406	147	uint64_t iter;
407	147	const EVP_MD *md;
408
409	147	if (!pbkdf2_set_ctx_params_decoder(params, &p))
410	0	return 0;
411
412	147	if (p.digest != NULL) {
413	91	if (!ossl_prov_digest_load(&ctx->digest, p.digest,
414	91	p.propq, p.engine, provctx))
415	10	return 0;
416	81	md = ossl_prov_digest_md(&ctx->digest);
417	81	if (EVP_MD_xof(md)) {
418	1	ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED);
419	1	return 0;
420	1	}
421	81	}
422
423	136	if (p.pkcs5 != NULL) {
424	80	if (!OSSL_PARAM_get_int(p.pkcs5, &pkcs5))
425	0	return 0;
426	80	ctx->lower_bound_checks = pkcs5 == 0;
427		#ifdef FIPS_MODULE
428		ossl_FIPS_IND_set_settable(OSSL_FIPS_IND_GET(ctx),
429		OSSL_FIPS_IND_SETTABLE0,
430		ctx->lower_bound_checks);
431		#endif
432	80	}
433
434	136	if (p.pw != NULL && !pbkdf2_set_membuf(&ctx->pass, &ctx->pass_len, p.pw))
435	0	return 0;
436
437	136	if (p.salt != NULL) {
438	80	if (!lower_bound_check_passed(ctx, (int)p.salt->data_size, UINT64_MAX, SIZE_MAX,
439	80	ctx->lower_bound_checks))
440	23	return 0;
441	57	if (!pbkdf2_set_membuf(&ctx->salt, &ctx->salt_len, p.salt))
442	0	return 0;
443	57	}
444
445	113	if (p.iter != NULL) {
446	57	if (!OSSL_PARAM_get_uint64(p.iter, &iter))
447	0	return 0;
448	57	if (!lower_bound_check_passed(ctx, INT_MAX, iter, SIZE_MAX,
449	57	ctx->lower_bound_checks))
450	1	return 0;
451	56	ctx->iter = iter;
452	56	}
453	112	return 1;
454	113	}
455
456		static const OSSL_PARAM kdf_pbkdf2_settable_ctx_params(ossl_unused void ctx,
457		ossl_unused void *p_ctx)
458	236	{
459	236	return pbkdf2_set_ctx_params_list;
460	236	}
461
462		/* Machine generated by util/perl/OpenSSL/paramnames.pm */
463		#ifndef pbkdf2_get_ctx_params_list
464		static const OSSL_PARAM pbkdf2_get_ctx_params_list[] = {
465		OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
466		# if defined(FIPS_MODULE)
467		OSSL_PARAM_int(OSSL_KDF_PARAM_FIPS_APPROVED_INDICATOR, NULL),
468		# endif
469		OSSL_PARAM_END
470		};
471		#endif
472
473		#ifndef pbkdf2_get_ctx_params_st
474		struct pbkdf2_get_ctx_params_st {
475		# if defined(FIPS_MODULE)
476		OSSL_PARAM *ind;
477		# endif
478		OSSL_PARAM *size;
479		};
480		#endif
481
482		#ifndef pbkdf2_get_ctx_params_decoder
483		static int pbkdf2_get_ctx_params_decoder
484		(const OSSL_PARAM p, struct pbkdf2_get_ctx_params_st r)
485	0	{
486	0	const char *s;
487
488	0	memset(r, 0, sizeof(*r));
489	0	if (p != NULL)
490	0	for (; (s = p->key) != NULL; p++)
491	0	switch(s[0]) {
492	0	default:
493	0	break;
494	0	case 'f':
495		# if defined(FIPS_MODULE)
496		if (ossl_likely(strcmp("ips-indicator", s + 1) == 0)) {
497		if (ossl_unlikely(r->ind != NULL)) {
498		ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
499		"param %s is repeated", s);
500		return 0;
501		}
502		r->ind = (OSSL_PARAM *)p;
503		}
504		# endif
505	0	break;
506	0	case 's':
507	0	if (ossl_likely(strcmp("ize", s + 1) == 0)) {
508	0	if (ossl_unlikely(r->size != NULL)) {
509	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,
510	0	"param %s is repeated", s);
511	0	return 0;
512	0	}
513	0	r->size = (OSSL_PARAM *)p;
514	0	}
515	0	}
516	0	return 1;
517	0	}
518		#endif
519		/* End of machine generated */
520
521		static int kdf_pbkdf2_get_ctx_params(void *vctx, OSSL_PARAM params[])
522	0	{
523	0	KDF_PBKDF2 *ctx = vctx;
524	0	struct pbkdf2_get_ctx_params_st p;
525
526	0	if (ctx == NULL \|\| !pbkdf2_get_ctx_params_decoder(params, &p))
527	0	return 0;
528
529	0	if (p.size != NULL && !OSSL_PARAM_set_size_t(p.size, SIZE_MAX))
530	0	return 0;
531
532	0	if (!OSSL_FIPS_IND_GET_CTX_FROM_PARAM(ctx, p.ind))
533	0	return 0;
534	0	return 1;
535	0	}
536
537		static const OSSL_PARAM kdf_pbkdf2_gettable_ctx_params(ossl_unused void ctx,
538		ossl_unused void *p_ctx)
539	0	{
540	0	return pbkdf2_get_ctx_params_list;
541	0	}
542
543		const OSSL_DISPATCH ossl_kdf_pbkdf2_functions[] = {
544		{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pbkdf2_new },
545		{ OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_pbkdf2_dup },
546		{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pbkdf2_free },
547		{ OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pbkdf2_reset },
548		{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pbkdf2_derive },
549		{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
550		(void(*)(void))kdf_pbkdf2_settable_ctx_params },
551		{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pbkdf2_set_ctx_params },
552		{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
553		(void(*)(void))kdf_pbkdf2_gettable_ctx_params },
554		{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pbkdf2_get_ctx_params },
555		OSSL_DISPATCH_END
556		};
557
558		/*
559		* This is an implementation of PKCS#5 v2.0 password based encryption key
560		* derivation function PBKDF2. SHA1 version verified against test vectors
561		* posted by Peter Gutmann to the PKCS-TNG mailing list.
562		*
563		* The constraints specified by SP800-132 have been added i.e.
564		* - Check the range of the key length.
565		* - Minimum iteration count of 1000.
566		* - Randomly-generated portion of the salt shall be at least 128 bits.
567		*/
568		static int pbkdf2_derive(KDF_PBKDF2 ctx, const char pass, size_t passlen,
569		const unsigned char *salt, int saltlen, uint64_t iter,
570		const EVP_MD digest, unsigned char key,
571		size_t keylen, int lower_bound_checks)
572	56	{
573	56	int ret = 0;
574	56	unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
575	56	int cplen, k, tkeylen, mdlen;
576	56	uint64_t j;
577	56	unsigned long i = 1;
578	56	HMAC_CTX hctx_tpl = NULL, hctx = NULL;
579
580	56	mdlen = EVP_MD_get_size(digest);
581	56	if (mdlen <= 0)
582	1	return 0;
583
584		/*
585		* This check should always be done because keylen / mdlen >= (2^32 - 1)
586		* results in an overflow of the loop counter 'i'.
587		*/
588	55	if ((keylen / mdlen) >= KDF_PBKDF2_MAX_KEY_LEN_DIGEST_RATIO) {
589	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
590	0	return 0;
591	0	}
592
593	55	if (!lower_bound_check_passed(ctx, saltlen, iter, keylen, lower_bound_checks))
594	0	return 0;
595
596	55	hctx_tpl = HMAC_CTX_new();
597	55	if (hctx_tpl == NULL)
598	0	return 0;
599	55	p = key;
600	55	tkeylen = (int)keylen;
601	55	if (!HMAC_Init_ex(hctx_tpl, pass, (int)passlen, digest, NULL))
602	0	goto err;
603	55	hctx = HMAC_CTX_new();
604	55	if (hctx == NULL)
605	0	goto err;
606	134	while (tkeylen) {
607	79	if (tkeylen > mdlen)
608	24	cplen = mdlen;
609	55	else
610	55	cplen = tkeylen;
611		/*
612		* We are unlikely to ever use more than 256 blocks (5120 bits!) but
613		* just in case...
614		*/
615	79	itmp[0] = (unsigned char)((i >> 24) & 0xff);
616	79	itmp[1] = (unsigned char)((i >> 16) & 0xff);
617	79	itmp[2] = (unsigned char)((i >> 8) & 0xff);
618	79	itmp[3] = (unsigned char)(i & 0xff);
619	79	if (!HMAC_CTX_copy(hctx, hctx_tpl))
620	0	goto err;
621	79	if (!HMAC_Update(hctx, salt, saltlen)
622	79	\|\| !HMAC_Update(hctx, itmp, 4)
623	79	\|\| !HMAC_Final(hctx, digtmp, NULL))
624	0	goto err;
625	79	memcpy(p, digtmp, cplen);
626	79	for (j = 1; j < iter; j++) {
627	0	if (!HMAC_CTX_copy(hctx, hctx_tpl))
628	0	goto err;
629	0	if (!HMAC_Update(hctx, digtmp, mdlen)
630	0	\|\| !HMAC_Final(hctx, digtmp, NULL))
631	0	goto err;
632	0	for (k = 0; k < cplen; k++)
633	0	p[k] ^= digtmp[k];
634	0	}
635	79	tkeylen -= cplen;
636	79	i++;
637	79	p += cplen;
638	79	}
639	55	ret = 1;
640
641	55	err:
642	55	HMAC_CTX_free(hctx);
643	55	HMAC_CTX_free(hctx_tpl);
644	55	return ret;
645	55	}