/*

 * Copyright 1995-2021 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

 */

/*

 * DES low level APIs are deprecated for public use, but still ok for internal

 * use.

 */

#include "internal/deprecated.h"

#include <stdio.h>

#include "internal/cryptlib.h"

#ifndef OPENSSL_NO_DES

# include <openssl/evp.h>

# include <openssl/objects.h>

# include "crypto/evp.h"

# include <openssl/des.h>

# include <openssl/rand.h>

# include "evp_local.h"

typedef struct {

    union {

        OSSL_UNION_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 "crypto/sparc_arch.h"

#  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),

                        EVP_CIPHER_CTX_get_cipher_data(ctx),

                        EVP_CIPHER_CTX_is_encrypting(ctx));

    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) {

        int num = EVP_CIPHER_CTX_get_num(ctx);

        DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK,

                          EVP_CIPHER_CTX_get_cipher_data(ctx),

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

        EVP_CIPHER_CTX_set_num(ctx, num);

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl) {

        int num = EVP_CIPHER_CTX_get_num(ctx);

        DES_ofb64_encrypt(in, out, (long)inl,

                          EVP_CIPHER_CTX_get_cipher_data(ctx),

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

        EVP_CIPHER_CTX_set_num(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 *) EVP_CIPHER_CTX_get_cipher_data(ctx);

    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,

                         EVP_CIPHER_CTX_get_cipher_data(ctx),

                         (DES_cblock *)ctx->iv,

                         EVP_CIPHER_CTX_is_encrypting(ctx));

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_ncbc_encrypt(in, out, (long)inl,

                         EVP_CIPHER_CTX_get_cipher_data(ctx),

                         (DES_cblock *)ctx->iv,

                         EVP_CIPHER_CTX_is_encrypting(ctx));

    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) {

        int num = EVP_CIPHER_CTX_get_num(ctx);

        DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK,

                          EVP_CIPHER_CTX_get_cipher_data(ctx),

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

                          EVP_CIPHER_CTX_is_encrypting(ctx));

        EVP_CIPHER_CTX_set_num(ctx, num);

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl) {

        int num = EVP_CIPHER_CTX_get_num(ctx);

        DES_cfb64_encrypt(in, out, (long)inl,

                          EVP_CIPHER_CTX_get_cipher_data(ctx),

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

                          EVP_CIPHER_CTX_is_encrypting(ctx));

        EVP_CIPHER_CTX_set_num(ctx, num);

    }

    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, EVP_CIPHER_CTX_get_cipher_data(ctx),

                            (DES_cblock *)ctx->iv,

                            EVP_CIPHER_CTX_is_encrypting(ctx));

            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,

                        EVP_CIPHER_CTX_get_cipher_data(ctx),

                        (DES_cblock *)ctx->iv,

                        EVP_CIPHER_CTX_is_encrypting(ctx));

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_cfb_encrypt(in, out, 8, (long)inl,

                        EVP_CIPHER_CTX_get_cipher_data(ctx),

                        (DES_cblock *)ctx->iv,

                        EVP_CIPHER_CTX_is_encrypting(ctx));

    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 *) EVP_CIPHER_CTX_get_cipher_data(ctx);

    dat->stream.cbc = NULL;

# if defined(SPARC_DES_CAPABLE)

    if (SPARC_DES_CAPABLE) {

        int mode = EVP_CIPHER_CTX_get_mode(ctx);

        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

    DES_set_key_unchecked(deskey, EVP_CIPHER_CTX_get_cipher_data(ctx));

    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_priv_bytes(ptr, 8) <= 0)

            return 0;

        DES_set_odd_parity((DES_cblock *)ptr);

        return 1;

    default:

        return -1;

    }

}

#endif