/*

 * Copyright 1999-2017 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (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 <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_hmac_md5, -1, NID_md5, 0},

    {EVP_PBE_TYPE_PRF, NID_hmac_sha1, -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_PRF, NID_hmacWithSHA512_224, -1, NID_sha512_224, 0},

    {EVP_PBE_TYPE_PRF, NID_hmacWithSHA512_256, -1, NID_sha512_256, 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;

    if (!sk_EVP_PBE_CTL_push(pbe_algs, pbe_tmp)) {

        OPENSSL_free(pbe_tmp);

        goto err;

    }

    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 != NULL) {

        i = sk_EVP_PBE_CTL_find(pbe_algs, &pbelu);

        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;

}