/*

 * Copyright 1999-2016 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/pkcs12.h>

/* Define this to dump decrypted output to files called DERnnn */

/*

 * #define OPENSSL_DEBUG_DECRYPT

 */

/*

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

 * OPENSSL_malloc'ed buffer

 */

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)

{

    unsigned char *out = NULL;

    int outlen, i;

    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();

    if (ctx == NULL) {

        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_MALLOC_FAILURE);

        goto err;

    }

    /* Decrypt data */

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

                            algor->parameter, ctx, en_de)) {

        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,

                  PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);

        goto err;

    }

    if ((out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(ctx)))

            == NULL) {

        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_MALLOC_FAILURE);

        goto err;

    }

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

        OPENSSL_free(out);

        out = NULL;

        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_EVP_LIB);

        goto err;

    }

    outlen = i;

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

        OPENSSL_free(out);

        out = NULL;

        PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,

                  PKCS12_R_PKCS12_CIPHERFINAL_ERROR);

        goto err;

    }

    outlen += i;

    if (datalen)

        *datalen = outlen;

    if (data)

        *data = out;

 err:

    EVP_CIPHER_CTX_free(ctx);

    return out;

}

/*

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

 * after use.

 */

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)

{

    unsigned char *out;

    const unsigned char *p;

    void *ret;

    int outlen;

    if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,

                          &out, &outlen, 0)) {

        PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,

                  PKCS12_R_PKCS12_PBE_CRYPT_ERROR);

        return NULL;

    }

    p = out;

#ifdef OPENSSL_DEBUG_DECRYPT

    {

        FILE *op;

        char fname[30];

        static int fnm = 1;

        sprintf(fname, "DER%d", fnm++);

        op = fopen(fname, "wb");

        fwrite(p, 1, outlen, op);

        fclose(op);

    }

#endif

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

    if (zbuf)

        OPENSSL_cleanse(out, outlen);

    if (!ret)

        PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I, PKCS12_R_DECODE_ERROR);

    OPENSSL_free(out);

    return ret;

}

/*

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

 * encoding.

 */

ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor,

                                           const ASN1_ITEM *it,

                                           const char *pass, int passlen,

                                           void *obj, int zbuf)

{

    ASN1_OCTET_STRING *oct = NULL;

    unsigned char *in = NULL;

    int inlen;

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

        PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, ERR_R_MALLOC_FAILURE);

        goto err;

    }

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

    if (!in) {

        PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCODE_ERROR);

        goto err;

    }

    if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,

                          &oct->length, 1)) {

        PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, 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;

}