/* crypto/evp/e_des.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include "cryptlib.h"

#ifndef OPENSSL_NO_DES

# include <openssl/evp.h>

# include <openssl/objects.h>

# include "evp_locl.h"

# include <openssl/des.h>

# include <openssl/rand.h>

typedef struct {

    union {

        double align;

        DES_key_schedule ks;

    } ks;

    union {

        void (*cbc) (const void *, void *, size_t,

                     const DES_key_schedule *, unsigned char *);

    } stream;

} EVP_DES_KEY;

# if defined(AES_ASM) && (defined(__sparc) || defined(__sparc__))

/* ----------^^^ this is not a typo, just a way to detect that

 * assembler support was in general requested... */

#  include "sparc_arch.h"

extern unsigned int OPENSSL_sparcv9cap_P[];

#  define SPARC_DES_CAPABLE       (OPENSSL_sparcv9cap_P[1] & CFR_DES)

void des_t4_key_expand(const void *key, DES_key_schedule *ks);

void des_t4_cbc_encrypt(const void *inp, void *out, size_t len,

                        const DES_key_schedule *ks, unsigned char iv[8]);

void des_t4_cbc_decrypt(const void *inp, void *out, size_t len,

                        const DES_key_schedule *ks, unsigned char iv[8]);

# endif

static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                        const unsigned char *iv, int enc);

static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

/*

 * Because of various casts and different names can't use

 * IMPLEMENT_BLOCK_CIPHER

 */

static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                          const unsigned char *in, size_t inl)

{

    BLOCK_CIPHER_ecb_loop()

        DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i),

                        ctx->cipher_data, ctx->encrypt);

    return 1;

}

static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                          const unsigned char *in, size_t inl)

{

    while (inl >= EVP_MAXCHUNK) {

        DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,

                          (DES_cblock *)ctx->iv, &ctx->num);

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data,

                          (DES_cblock *)ctx->iv, &ctx->num);

    return 1;

}

static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                          const unsigned char *in, size_t inl)

{

    EVP_DES_KEY *dat = (EVP_DES_KEY *) ctx->cipher_data;

    if (dat->stream.cbc != NULL) {

        (*dat->stream.cbc) (in, out, inl, &dat->ks.ks, ctx->iv);

        return 1;

    }

    while (inl >= EVP_MAXCHUNK) {

        DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,

                         (DES_cblock *)ctx->iv, ctx->encrypt);

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,

                         (DES_cblock *)ctx->iv, ctx->encrypt);

    return 1;

}

static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                            const unsigned char *in, size_t inl)

{

    while (inl >= EVP_MAXCHUNK) {

        DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,

                          (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,

                          (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);

    return 1;

}

/*

 * Although we have a CFB-r implementation for DES, it doesn't pack the right

 * way, so wrap it here

 */

static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                           const unsigned char *in, size_t inl)

{

    size_t n, chunk = EVP_MAXCHUNK / 8;

    unsigned char c[1], d[1];

    if (inl < chunk)

        chunk = inl;

    while (inl && inl >= chunk) {

        for (n = 0; n < chunk * 8; ++n) {

            c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;

            DES_cfb_encrypt(c, d, 1, 1, ctx->cipher_data,

                            (DES_cblock *)ctx->iv, ctx->encrypt);

            out[n / 8] =

                (out[n / 8] & ~(0x80 >> (unsigned int)(n % 8))) |

                ((d[0] & 0x80) >> (unsigned int)(n % 8));

        }

        inl -= chunk;

        in += chunk;

        out += chunk;

        if (inl < chunk)

            chunk = inl;

    }

    return 1;

}

static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                           const unsigned char *in, size_t inl)

{

    while (inl >= EVP_MAXCHUNK) {

        DES_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK, ctx->cipher_data,

                        (DES_cblock *)ctx->iv, ctx->encrypt);

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_cfb_encrypt(in, out, 8, (long)inl, ctx->cipher_data,

                        (DES_cblock *)ctx->iv, ctx->encrypt);

    return 1;

}

BLOCK_CIPHER_defs(des, EVP_DES_KEY, NID_des, 8, 8, 8, 64,

                  EVP_CIPH_RAND_KEY, des_init_key, NULL,

                  EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)

    BLOCK_CIPHER_def_cfb(des, EVP_DES_KEY, NID_des, 8, 8, 1,

                     EVP_CIPH_RAND_KEY, des_init_key, NULL,

                     EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)

    BLOCK_CIPHER_def_cfb(des, EVP_DES_KEY, NID_des, 8, 8, 8,

                     EVP_CIPH_RAND_KEY, des_init_key, NULL,

                     EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)

static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                        const unsigned char *iv, int enc)

{

    DES_cblock *deskey = (DES_cblock *)key;

    EVP_DES_KEY *dat = (EVP_DES_KEY *) ctx->cipher_data;

    dat->stream.cbc = NULL;

# if defined(SPARC_DES_CAPABLE)

    if (SPARC_DES_CAPABLE) {

        int mode = ctx->cipher->flags & EVP_CIPH_MODE;

        if (mode == EVP_CIPH_CBC_MODE) {

            des_t4_key_expand(key, &dat->ks.ks);

            dat->stream.cbc = enc ? des_t4_cbc_encrypt : des_t4_cbc_decrypt;

            return 1;

        }

    }

# endif

# ifdef EVP_CHECK_DES_KEY

    if (DES_set_key_checked(deskey, dat->ks.ks) != 0)

        return 0;

# else

    DES_set_key_unchecked(deskey, ctx->cipher_data);

# endif

    return 1;

}

static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)

{

    switch (type) {

    case EVP_CTRL_RAND_KEY:

        if (RAND_bytes(ptr, 8) <= 0)

            return 0;

        DES_set_odd_parity((DES_cblock *)ptr);

        return 1;

    default:

        return -1;

    }

}

#endif