/* $OpenBSD: e_des3.c,v 1.31 2025/05/27 03:58:12 tb Exp $ */
/* 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 <limits.h>
#include <stdio.h>
#include <string.h>

#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_DES

#include <openssl/des.h>
#include <openssl/evp.h>
#include <openssl/objects.h>

#include "evp_local.h"

typedef struct {
    DES_key_schedule ks1;/* key schedule */
    DES_key_schedule ks2;/* key schedule (for ede) */
    DES_key_schedule ks3;/* key schedule (for ede3) */
} DES_EDE_KEY;

#define data(ctx) ((DES_EDE_KEY *)(ctx)->cipher_data)

static int
des_ede_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
        DES_cblock *deskey = (DES_cblock *)key;

        DES_set_key_unchecked(&deskey[0], &data(ctx)->ks1);
        DES_set_key_unchecked(&deskey[1], &data(ctx)->ks2);
        memcpy(&data(ctx)->ks3, &data(ctx)->ks1,
            sizeof(data(ctx)->ks1));
        return 1;
}

static int
des_ede3_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
        DES_cblock *deskey = (DES_cblock *)key;


        DES_set_key_unchecked(&deskey[0], &data(ctx)->ks1);
        DES_set_key_unchecked(&deskey[1], &data(ctx)->ks2);
        DES_set_key_unchecked(&deskey[2], &data(ctx)->ks3);
        return 1;
}

static int
des3_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
        DES_cblock *deskey = ptr;

        switch (type) {
        case EVP_CTRL_RAND_KEY:
                if (DES_random_key(deskey) == 0)
                        return 0;
                if (c->key_len >= 16 && DES_random_key(deskey + 1) == 0)
                        return 0;
                if (c->key_len >= 24 && DES_random_key(deskey + 2) == 0)
                        return 0;
                return 1;

        default:
                return -1;
        }
}

static int
des_ede_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inl)
{
        size_t i, bl;

        bl = ctx->cipher->block_size;

        if (inl < bl)
                return 1;

        inl -= bl;

        for (i = 0; i <= inl; i += bl)
                DES_ecb3_encrypt((const_DES_cblock *)(in + i), (DES_cblock *)(out + i),
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3, ctx->encrypt);

        return 1;
}

static int
des_ede_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inl)
{
        size_t chunk = LONG_MAX & ~0xff;

        while (inl >= chunk) {
                DES_ede3_ofb64_encrypt(in, out, (long)chunk,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, &ctx->num);
                inl -= chunk;
                in += chunk;
                out += chunk;
        }
        if (inl)
                DES_ede3_ofb64_encrypt(in, out, (long)inl,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, &ctx->num);

        return 1;
}

static int
des_ede_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inl)
{
        size_t chunk = LONG_MAX & ~0xff;

        while (inl >= chunk) {
                DES_ede3_cbc_encrypt(in, out, (long)chunk,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, ctx->encrypt);
                inl -= chunk;
                in += chunk;
                out += chunk;
        }
        if (inl)
                DES_ede3_cbc_encrypt(in, out, (long)inl,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, ctx->encrypt);
        return 1;
}

static int
des_ede_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inl)
{
        size_t chunk = LONG_MAX & ~0xff;

        while (inl >= chunk) {
                DES_ede3_cfb64_encrypt(in, out, (long)chunk,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
                inl -= chunk;
                in += chunk;
                out += chunk;
        }
        if (inl)
                DES_ede3_cfb64_encrypt(in, out, (long)inl,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
        return 1;
}

/* Although we have a CFB-r implementation for 3-DES, it doesn't pack the right
   way, so wrap it here */
static int
des_ede3_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inl)
{
        unsigned char c[1], d[1];
        size_t n;

        if (!(ctx->flags & EVP_CIPH_FLAG_LENGTH_BITS))
                inl *= 8;

        for (n = 0; n < inl; ++n) {
                c[0] = (in[n/8]&(1 << (7 - n % 8))) ? 0x80 : 0;
                DES_ede3_cfb_encrypt(c, d, 1, 1,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, ctx->encrypt);
                out[n / 8] = (out[n / 8] & ~(0x80 >> (unsigned int)(n % 8))) |
                    ((d[0] & 0x80) >> (unsigned int)(n % 8));
        }

        return 1;
}

static int
des_ede3_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inl)
{
        size_t chunk = LONG_MAX & ~0xff;

        while (inl >= chunk) {
                DES_ede3_cfb_encrypt(in, out, 8, (long)chunk,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, ctx->encrypt);
                inl -= chunk;
                in += chunk;
                out += chunk;
        }
        if (inl)
                DES_ede3_cfb_encrypt(in, out, 8, (long)inl,
                    &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,
                    (DES_cblock *)ctx->iv, ctx->encrypt);
        return 1;
}

static const EVP_CIPHER des_ede_cbc = {
        .nid = NID_des_ede_cbc,
        .block_size = 8,
        .key_len = 16,
        .iv_len = 8,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CBC_MODE |
           EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede_init_key,
        .do_cipher = des_ede_cbc_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede_cbc(void)
{
        return &des_ede_cbc;
}
LCRYPTO_ALIAS(EVP_des_ede_cbc);

static const EVP_CIPHER des_ede_cfb64 = {
        .nid = NID_des_ede_cfb64,
        .block_size = 1,
        .key_len = 16,
        .iv_len = 8,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CFB_MODE |
            EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede_init_key,
        .do_cipher = des_ede_cfb64_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede_cfb64(void)
{
        return &des_ede_cfb64;
}
LCRYPTO_ALIAS(EVP_des_ede_cfb64);

static const EVP_CIPHER des_ede_ofb = {
        .nid = NID_des_ede_ofb64,
        .block_size = 1,
        .key_len = 16,
        .iv_len = 8,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_OFB_MODE,
        .init = des_ede_init_key,
        .do_cipher = des_ede_ofb_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede_ofb(void)
{
        return &des_ede_ofb;
}
LCRYPTO_ALIAS(EVP_des_ede_ofb);

static const EVP_CIPHER des_ede_ecb = {
        .nid = NID_des_ede_ecb,
        .block_size = 8,
        .key_len = 16,
        .iv_len = 0,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_ECB_MODE |
            EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede_init_key,
        .do_cipher = des_ede_ecb_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede_ecb(void)
{
        return &des_ede_ecb;
}
LCRYPTO_ALIAS(EVP_des_ede_ecb);


#define des_ede3_cfb64_cipher des_ede_cfb64_cipher
#define des_ede3_ofb_cipher des_ede_ofb_cipher
#define des_ede3_cbc_cipher des_ede_cbc_cipher
#define des_ede3_ecb_cipher des_ede_ecb_cipher

static const EVP_CIPHER des_ede3_cbc = {
        .nid = NID_des_ede3_cbc,
        .block_size = 8,
        .key_len = 24,
        .iv_len = 8,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CBC_MODE |
            EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede3_init_key,
        .do_cipher = des_ede3_cbc_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede3_cbc(void)
{
        return &des_ede3_cbc;
}
LCRYPTO_ALIAS(EVP_des_ede3_cbc);

static const EVP_CIPHER des_ede3_cfb64 = {
        .nid = NID_des_ede3_cfb64,
        .block_size = 1,
        .key_len = 24,
        .iv_len = 8,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CFB_MODE |
            EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede3_init_key,
        .do_cipher = des_ede3_cfb64_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede3_cfb64(void)
{
        return &des_ede3_cfb64;
}
LCRYPTO_ALIAS(EVP_des_ede3_cfb64);

static const EVP_CIPHER des_ede3_ofb = {
        .nid = NID_des_ede3_ofb64,
        .block_size = 1,
        .key_len = 24,
        .iv_len = 8,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_OFB_MODE |
            EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede3_init_key,
        .do_cipher = des_ede3_ofb_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede3_ofb(void)
{
        return &des_ede3_ofb;
}
LCRYPTO_ALIAS(EVP_des_ede3_ofb);

static const EVP_CIPHER des_ede3_ecb = {
        .nid = NID_des_ede3_ecb,
        .block_size = 8,
        .key_len = 24,
        .iv_len = 0,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_ECB_MODE |
            EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede3_init_key,
        .do_cipher = des_ede3_ecb_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede3_ecb(void)
{
        return &des_ede3_ecb;
}
LCRYPTO_ALIAS(EVP_des_ede3_ecb);


static const EVP_CIPHER des_ede3_cfb1 = {
        .nid = NID_des_ede3_cfb1,
        .block_size = 1,
        .key_len = 24,
        .iv_len = 8,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CFB_MODE |
            EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede3_init_key,
        .do_cipher = des_ede3_cfb1_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede3_cfb1(void)
{
        return &des_ede3_cfb1;
}
LCRYPTO_ALIAS(EVP_des_ede3_cfb1);


static const EVP_CIPHER des_ede3_cfb8 = {
        .nid = NID_des_ede3_cfb8,
        .block_size = 1,
        .key_len = 24,
        .iv_len = 8,
        .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CFB_MODE |
            EVP_CIPH_FLAG_DEFAULT_ASN1,
        .init = des_ede3_init_key,
        .do_cipher = des_ede3_cfb8_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(DES_EDE_KEY),
        .set_asn1_parameters = NULL,
        .get_asn1_parameters = NULL,
        .ctrl = des3_ctrl,
};

const EVP_CIPHER *
EVP_des_ede3_cfb8(void)
{
        return &des_ede3_cfb8;
}
LCRYPTO_ALIAS(EVP_des_ede3_cfb8);

const EVP_CIPHER *
EVP_des_ede(void)
{
        return &des_ede_ecb;
}
LCRYPTO_ALIAS(EVP_des_ede);

const EVP_CIPHER *
EVP_des_ede3(void)
{
        return &des_ede3_ecb;
}
LCRYPTO_ALIAS(EVP_des_ede3);
#endif