/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
 * 1999.
 */
/* ====================================================================
 * Copyright (c) 1999-2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/evp.h>
#include <openssl/pkcs12.h>
#include <openssl/x509.h>
#include "evp_locl.h"

/* Password based encryption (PBE) functions */

/* Setup a cipher context from a PBE algorithm */

struct evp_pbe_st {
    int pbe_type;
    int pbe_nid;
    int cipher_nid;
    int md_nid;
    EVP_PBE_KEYGEN *keygen;
};

static STACK_OF(EVP_PBE_CTL) *pbe_algs;

static const EVP_PBE_CTL builtin_pbe[] = {
    {EVP_PBE_TYPE_OUTER, NID_pbeWithMD2AndDES_CBC,
     NID_des_cbc, NID_md2, PKCS5_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbeWithMD5AndDES_CBC,
     NID_des_cbc, NID_md5, PKCS5_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbeWithSHA1AndRC2_CBC,
     NID_rc2_64_cbc, NID_sha1, PKCS5_PBE_keyivgen},

    {EVP_PBE_TYPE_OUTER, NID_id_pbkdf2, -1, -1, PKCS5_v2_PBKDF2_keyivgen},

    {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And128BitRC4,
     NID_rc4, NID_sha1, PKCS12_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And40BitRC4,
     NID_rc4_40, NID_sha1, PKCS12_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And3_Key_TripleDES_CBC,
     NID_des_ede3_cbc, NID_sha1, PKCS12_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And2_Key_TripleDES_CBC,
     NID_des_ede_cbc, NID_sha1, PKCS12_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And128BitRC2_CBC,
     NID_rc2_cbc, NID_sha1, PKCS12_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And40BitRC2_CBC,
     NID_rc2_40_cbc, NID_sha1, PKCS12_PBE_keyivgen},

    {EVP_PBE_TYPE_OUTER, NID_pbes2, -1, -1, PKCS5_v2_PBE_keyivgen},

    {EVP_PBE_TYPE_OUTER, NID_pbeWithMD2AndRC2_CBC,
     NID_rc2_64_cbc, NID_md2, PKCS5_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbeWithMD5AndRC2_CBC,
     NID_rc2_64_cbc, NID_md5, PKCS5_PBE_keyivgen},
    {EVP_PBE_TYPE_OUTER, NID_pbeWithSHA1AndDES_CBC,
     NID_des_cbc, NID_sha1, PKCS5_PBE_keyivgen},

    {EVP_PBE_TYPE_PRF, NID_hmacWithSHA1, -1, NID_sha1, 0},
    {EVP_PBE_TYPE_PRF, NID_hmacWithMD5, -1, NID_md5, 0},
    {EVP_PBE_TYPE_PRF, NID_hmacWithSHA224, -1, NID_sha224, 0},
    {EVP_PBE_TYPE_PRF, NID_hmacWithSHA256, -1, NID_sha256, 0},
    {EVP_PBE_TYPE_PRF, NID_hmacWithSHA384, -1, NID_sha384, 0},
    {EVP_PBE_TYPE_PRF, NID_hmacWithSHA512, -1, NID_sha512, 0},
    {EVP_PBE_TYPE_PRF, NID_id_HMACGostR3411_94, -1, NID_id_GostR3411_94, 0},
    {EVP_PBE_TYPE_PRF, NID_id_tc26_hmac_gost_3411_2012_256, -1,
     NID_id_GostR3411_2012_256, 0},
    {EVP_PBE_TYPE_PRF, NID_id_tc26_hmac_gost_3411_2012_512, -1,
     NID_id_GostR3411_2012_512, 0},
    {EVP_PBE_TYPE_KDF, NID_id_pbkdf2, -1, -1, PKCS5_v2_PBKDF2_keyivgen},
#ifndef OPENSSL_NO_SCRYPT
    {EVP_PBE_TYPE_KDF, NID_id_scrypt, -1, -1, PKCS5_v2_scrypt_keyivgen}
#endif
};

int EVP_PBE_CipherInit(ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
                       ASN1_TYPE *param, EVP_CIPHER_CTX *ctx, int en_de)
{
    const EVP_CIPHER *cipher;
    const EVP_MD *md;
    int cipher_nid, md_nid;
    EVP_PBE_KEYGEN *keygen;

    if (!EVP_PBE_find(EVP_PBE_TYPE_OUTER, OBJ_obj2nid(pbe_obj),
                      &cipher_nid, &md_nid, &keygen)) {
        char obj_tmp[80];
        EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_UNKNOWN_PBE_ALGORITHM);
        if (!pbe_obj)
            OPENSSL_strlcpy(obj_tmp, "NULL", sizeof obj_tmp);
        else
            i2t_ASN1_OBJECT(obj_tmp, sizeof obj_tmp, pbe_obj);
        ERR_add_error_data(2, "TYPE=", obj_tmp);
        return 0;
    }

    if (!pass)
        passlen = 0;
    else if (passlen == -1)
        passlen = strlen(pass);

    if (cipher_nid == -1)
        cipher = NULL;
    else {
        cipher = EVP_get_cipherbynid(cipher_nid);
        if (!cipher) {
            EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_UNKNOWN_CIPHER);
            return 0;
        }
    }

    if (md_nid == -1)
        md = NULL;
    else {
        md = EVP_get_digestbynid(md_nid);
        if (!md) {
            EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_UNKNOWN_DIGEST);
            return 0;
        }
    }

    if (!keygen(ctx, pass, passlen, param, cipher, md, en_de)) {
        EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_KEYGEN_FAILURE);
        return 0;
    }
    return 1;
}

DECLARE_OBJ_BSEARCH_CMP_FN(EVP_PBE_CTL, EVP_PBE_CTL, pbe2);

static int pbe2_cmp(const EVP_PBE_CTL *pbe1, const EVP_PBE_CTL *pbe2)
{
    int ret = pbe1->pbe_type - pbe2->pbe_type;
    if (ret)
        return ret;
    else
        return pbe1->pbe_nid - pbe2->pbe_nid;
}

IMPLEMENT_OBJ_BSEARCH_CMP_FN(EVP_PBE_CTL, EVP_PBE_CTL, pbe2);

static int pbe_cmp(const EVP_PBE_CTL *const *a, const EVP_PBE_CTL *const *b)
{
    int ret = (*a)->pbe_type - (*b)->pbe_type;
    if (ret)
        return ret;
    else
        return (*a)->pbe_nid - (*b)->pbe_nid;
}

/* Add a PBE algorithm */

int EVP_PBE_alg_add_type(int pbe_type, int pbe_nid, int cipher_nid,
                         int md_nid, EVP_PBE_KEYGEN *keygen)
{
    EVP_PBE_CTL *pbe_tmp;

    if (pbe_algs == NULL) {
        pbe_algs = sk_EVP_PBE_CTL_new(pbe_cmp);
        if (pbe_algs == NULL)
            goto err;
    }

    if ((pbe_tmp = OPENSSL_malloc(sizeof(*pbe_tmp))) == NULL)
        goto err;

    pbe_tmp->pbe_type = pbe_type;
    pbe_tmp->pbe_nid = pbe_nid;
    pbe_tmp->cipher_nid = cipher_nid;
    pbe_tmp->md_nid = md_nid;
    pbe_tmp->keygen = keygen;

    sk_EVP_PBE_CTL_push(pbe_algs, pbe_tmp);
    return 1;

 err:
    EVPerr(EVP_F_EVP_PBE_ALG_ADD_TYPE, ERR_R_MALLOC_FAILURE);
    return 0;
}

int EVP_PBE_alg_add(int nid, const EVP_CIPHER *cipher, const EVP_MD *md,
                    EVP_PBE_KEYGEN *keygen)
{
    int cipher_nid, md_nid;

    if (cipher)
        cipher_nid = EVP_CIPHER_nid(cipher);
    else
        cipher_nid = -1;
    if (md)
        md_nid = EVP_MD_type(md);
    else
        md_nid = -1;

    return EVP_PBE_alg_add_type(EVP_PBE_TYPE_OUTER, nid,
                                cipher_nid, md_nid, keygen);
}

int EVP_PBE_find(int type, int pbe_nid,
                 int *pcnid, int *pmnid, EVP_PBE_KEYGEN **pkeygen)
{
    EVP_PBE_CTL *pbetmp = NULL, pbelu;
    int i;
    if (pbe_nid == NID_undef)
        return 0;

    pbelu.pbe_type = type;
    pbelu.pbe_nid = pbe_nid;

    if (pbe_algs) {
        i = sk_EVP_PBE_CTL_find(pbe_algs, &pbelu);
        if (i != -1)
            pbetmp = sk_EVP_PBE_CTL_value(pbe_algs, i);
    }
    if (pbetmp == NULL) {
        pbetmp = OBJ_bsearch_pbe2(&pbelu, builtin_pbe, OSSL_NELEM(builtin_pbe));
    }
    if (pbetmp == NULL)
        return 0;
    if (pcnid)
        *pcnid = pbetmp->cipher_nid;
    if (pmnid)
        *pmnid = pbetmp->md_nid;
    if (pkeygen)
        *pkeygen = pbetmp->keygen;
    return 1;
}

static void free_evp_pbe_ctl(EVP_PBE_CTL *pbe)
{
    OPENSSL_free(pbe);
}

void EVP_PBE_cleanup(void)
{
    sk_EVP_PBE_CTL_pop_free(pbe_algs, free_evp_pbe_ctl);
    pbe_algs = NULL;
}

int EVP_PBE_get(int *ptype, int *ppbe_nid, size_t num)
{
    const EVP_PBE_CTL *tpbe;

    if (num >= OSSL_NELEM(builtin_pbe))
        return 0;

    tpbe = builtin_pbe + num;
    if (ptype)
        *ptype = tpbe->pbe_type;
    if (ppbe_nid)
        *ppbe_nid = tpbe->pbe_nid;
    return 1;
}