/* p12_decr.c */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
 * 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 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 "cryptlib.h"
#include <openssl/pkcs12.h>

/* Define this to dump decrypted output to files called DERnnn */
/*
 * #define DEBUG_DECRYPT
 */

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

unsigned char *PKCS12_pbe_crypt(X509_ALGOR *algor, const char *pass,
                                int passlen, unsigned char *in, int inlen,
                                unsigned char **data, int *datalen, int en_de)
{
    unsigned char *out;
    int outlen, i;
    EVP_CIPHER_CTX ctx;

    EVP_CIPHER_CTX_init(&ctx);
    /* 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);
        return NULL;
    }

    if (!(out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(&ctx)))) {
        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_cleanup(&ctx);
    return out;

}

/*
 * Decrypt an OCTET STRING and decode ASN1 structure if zbuf set zero buffer
 * after use.
 */

void *PKCS12_item_decrypt_d2i(X509_ALGOR *algor, const ASN1_ITEM *it,
                              const char *pass, int passlen,
                              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 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())) {
        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;
}