/*

 * Copyright 1999-2021 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

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/pkcs12.h>

#include <openssl/trace.h>

/*

 * Encrypt/Decrypt a buffer based on password and algor, result in a

 * OPENSSL_malloc'ed buffer

 */

unsigned char *PKCS12_pbe_crypt_ex(const X509_ALGOR *algor,

                                   const char *pass, int passlen,

                                   const unsigned char *in, int inlen,

                                   unsigned char **data, int *datalen, int en_de,

                                   OSSL_LIB_CTX *libctx, const char *propq)

{

    unsigned char *out = NULL;

    int outlen, i;

    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();

    int max_out_len, mac_len = 0;

    if (ctx == NULL) {

        ERR_raise(ERR_LIB_PKCS12, ERR_R_EVP_LIB);

        goto err;

    }

    /* Process data */

    if (!EVP_PBE_CipherInit_ex(algor->algorithm, pass, passlen,

                               algor->parameter, ctx, en_de, libctx, propq))

        goto err;

    /*

     * GOST algorithm specifics:

     * OMAC algorithm calculate and encrypt MAC of the encrypted objects

     * It's appended to encrypted text on encrypting

     * MAC should be processed on decrypting separately from plain text

     */

    max_out_len = inlen + EVP_CIPHER_CTX_get_block_size(ctx);

    if ((EVP_CIPHER_get_flags(EVP_CIPHER_CTX_get0_cipher(ctx))

                & EVP_CIPH_FLAG_CIPHER_WITH_MAC) != 0) {

        if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_TLS1_AAD, 0, &mac_len) < 0) {

            ERR_raise(ERR_LIB_PKCS12, ERR_R_INTERNAL_ERROR);

            goto err;

        }

        if (EVP_CIPHER_CTX_is_encrypting(ctx)) {

            max_out_len += mac_len;

        } else {

            if (inlen < mac_len) {

                ERR_raise(ERR_LIB_PKCS12, PKCS12_R_UNSUPPORTED_PKCS12_MODE);

                goto err;

            }

            inlen -= mac_len;

            if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,

                                    (int)mac_len, (unsigned char *)in+inlen) < 0) {

                ERR_raise(ERR_LIB_PKCS12, ERR_R_INTERNAL_ERROR);

                goto err;

            }

        }

    }

    if ((out = OPENSSL_malloc(max_out_len)) == NULL)

        goto err;

    if (!EVP_CipherUpdate(ctx, out, &i, in, inlen)) {

        OPENSSL_free(out);

        out = NULL;

        ERR_raise(ERR_LIB_PKCS12, ERR_R_EVP_LIB);

        goto err;

    }

    outlen = i;

    if (!EVP_CipherFinal_ex(ctx, out + i, &i)) {

        OPENSSL_free(out);

        out = NULL;

        ERR_raise_data(ERR_LIB_PKCS12, PKCS12_R_PKCS12_CIPHERFINAL_ERROR,

                       passlen == 0 ? "empty password"

                       : "maybe wrong password");

        goto err;

    }

    outlen += i;

    if ((EVP_CIPHER_get_flags(EVP_CIPHER_CTX_get0_cipher(ctx))

                & EVP_CIPH_FLAG_CIPHER_WITH_MAC) != 0) {

        if (EVP_CIPHER_CTX_is_encrypting(ctx)) {

            if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG,

                (int)mac_len, out+outlen) < 0) {

                OPENSSL_free(out);

                out = NULL;

                ERR_raise(ERR_LIB_PKCS12, ERR_R_INTERNAL_ERROR);

                goto err;

            }

            outlen += mac_len;

        }

    }

    if (datalen)

        *datalen = outlen;

    if (data)

        *data = out;

 err:

    EVP_CIPHER_CTX_free(ctx);

    return out;

}

unsigned char *PKCS12_pbe_crypt(const X509_ALGOR *algor,

                                const char *pass, int passlen,

                                const unsigned char *in, int inlen,

                                unsigned char **data, int *datalen, int en_de)

{

    return PKCS12_pbe_crypt_ex(algor, pass, passlen, in, inlen, data, datalen,

                               en_de, NULL, NULL);

}

/*

 * Decrypt an OCTET STRING and decode ASN1 structure if zbuf set zero buffer

 * after use.

 */

void *PKCS12_item_decrypt_d2i_ex(const X509_ALGOR *algor, const ASN1_ITEM *it,

                                 const char *pass, int passlen,

                                 const ASN1_OCTET_STRING *oct, int zbuf,

                                 OSSL_LIB_CTX *libctx,

                                 const char *propq)

{

    unsigned char *out = NULL;

    const unsigned char *p;

    void *ret;

    int outlen = 0;

    if (!PKCS12_pbe_crypt_ex(algor, pass, passlen, oct->data, oct->length,

                             &out, &outlen, 0, libctx, propq))

        return NULL;

    p = out;

    OSSL_TRACE_BEGIN(PKCS12_DECRYPT) {

        BIO_printf(trc_out, "\n");

        BIO_dump(trc_out, out, outlen);

        BIO_printf(trc_out, "\n");

    } OSSL_TRACE_END(PKCS12_DECRYPT);

    ret = ASN1_item_d2i(NULL, &p, outlen, it);

    if (zbuf)

        OPENSSL_cleanse(out, outlen);

    if (!ret)

        ERR_raise(ERR_LIB_PKCS12, PKCS12_R_DECODE_ERROR);

    OPENSSL_free(out);

    return ret;

}

void *PKCS12_item_decrypt_d2i(const X509_ALGOR *algor, const ASN1_ITEM *it,

                              const char *pass, int passlen,

                              const ASN1_OCTET_STRING *oct, int zbuf)

{

    return PKCS12_item_decrypt_d2i_ex(algor, it, pass, passlen, oct, zbuf,

                                      NULL, NULL);

}

/*

 * Encode ASN1 structure and encrypt, return OCTET STRING if zbuf set zero

 * encoding.

 */

ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt_ex(X509_ALGOR *algor,

                                              const ASN1_ITEM *it,

                                              const char *pass, int passlen,

                                              void *obj, int zbuf,

                                              OSSL_LIB_CTX *ctx,

                                              const char *propq)

{

    ASN1_OCTET_STRING *oct = NULL;

    unsigned char *in = NULL;

    int inlen;

    if ((oct = ASN1_OCTET_STRING_new()) == NULL) {

        ERR_raise(ERR_LIB_PKCS12, ERR_R_ASN1_LIB);

        goto err;

    }

    inlen = ASN1_item_i2d(obj, &in, it);

    if (!in) {

        ERR_raise(ERR_LIB_PKCS12, PKCS12_R_ENCODE_ERROR);

        goto err;

    }

    if (!PKCS12_pbe_crypt_ex(algor, pass, passlen, in, inlen, &oct->data,

                             &oct->length, 1, ctx, propq)) {

        ERR_raise(ERR_LIB_PKCS12, PKCS12_R_ENCRYPT_ERROR);

        OPENSSL_free(in);

        goto err;

    }

    if (zbuf)

        OPENSSL_cleanse(in, inlen);

    OPENSSL_free(in);

    return oct;

 err:

    ASN1_OCTET_STRING_free(oct);

    return NULL;

}

ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor,

                                           const ASN1_ITEM *it,

                                           const char *pass, int passlen,

                                           void *obj, int zbuf)

{

    return PKCS12_item_i2d_encrypt_ex(algor, it, pass, passlen, obj, zbuf, NULL, NULL);

}