/*

 * 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/objects.h>

# include "crypto/evp.h"

# include "crypto/sha.h"

# include <openssl/des.h>

# include <openssl/rand.h>

# include "evp_local.h"

typedef struct {

    union {

        OSSL_UNION_ALIGN;

        DES_key_schedule ks[3];

    } ks;

    union {

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

                     const DES_key_schedule *, unsigned char *);

    } stream;

} DES_EDE_KEY;

# define ks1 ks.ks[0]

# define ks2 ks.ks[1]

# define ks3 ks.ks[2]

# 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_ede3_cbc_encrypt(const void *inp, void *out, size_t len,

                             const DES_key_schedule ks[3], unsigned char iv[8]);

void des_t4_ede3_cbc_decrypt(const void *inp, void *out, size_t len,

                             const DES_key_schedule ks[3], unsigned char iv[8]);

# endif

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

                            const unsigned char *iv, int enc);

static int des_ede3_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                             const unsigned char *iv, int enc);

static int des3_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

# define data(ctx) EVP_C_DATA(DES_EDE_KEY,ctx)

/*

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

 * IMPLEMENT_BLOCK_CIPHER

 */

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

                              const unsigned char *in, size_t inl)

{

    BLOCK_CIPHER_ecb_loop()

        DES_ecb3_encrypt((const_DES_cblock *)(in + i),

                         (DES_cblock *)(out + i),

                         &data(ctx)->ks1, &data(ctx)->ks2,

                         &data(ctx)->ks3, EVP_CIPHER_CTX_is_encrypting(ctx));

    return 1;

}

static int des_ede_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_ede3_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK,

                               &data(ctx)->ks1, &data(ctx)->ks2,

                               &data(ctx)->ks3,

                               (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_ede3_ofb64_encrypt(in, out, (long)inl,

                               &data(ctx)->ks1, &data(ctx)->ks2,

                               &data(ctx)->ks3,

                               (DES_cblock *)ctx->iv,

                               &num);

        EVP_CIPHER_CTX_set_num(ctx, num);

    }

    return 1;

}

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

                              const unsigned char *in, size_t inl)

{

    DES_EDE_KEY *dat = 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_ede3_cbc_encrypt(in, out, (long)EVP_MAXCHUNK,

                             &dat->ks1, &dat->ks2, &dat->ks3,

                             (DES_cblock *)ctx->iv,

                             EVP_CIPHER_CTX_is_encrypting(ctx));

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_ede3_cbc_encrypt(in, out, (long)inl,

                             &dat->ks1, &dat->ks2, &dat->ks3,

                             (DES_cblock *)ctx->iv,

                             EVP_CIPHER_CTX_is_encrypting(ctx));

    return 1;

}

static int des_ede_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_ede3_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK,

                               &data(ctx)->ks1, &data(ctx)->ks2,

                               &data(ctx)->ks3, (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_ede3_cfb64_encrypt(in, out, (long)inl,

                               &data(ctx)->ks1, &data(ctx)->ks2,

                               &data(ctx)->ks3, (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 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)

{

    size_t n;

    unsigned char c[1];

    unsigned char d[1] = { 0 }; /* Appease Coverity */

    if (!EVP_CIPHER_CTX_test_flags(ctx, 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,

                             EVP_CIPHER_CTX_is_encrypting(ctx));

        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)

{

    while (inl >= EVP_MAXCHUNK) {

        DES_ede3_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK,

                             &data(ctx)->ks1, &data(ctx)->ks2,

                             &data(ctx)->ks3, (DES_cblock *)ctx->iv,

                             EVP_CIPHER_CTX_is_encrypting(ctx));

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_ede3_cfb_encrypt(in, out, 8, (long)inl,

                             &data(ctx)->ks1, &data(ctx)->ks2,

                             &data(ctx)->ks3, (DES_cblock *)ctx->iv,

                             EVP_CIPHER_CTX_is_encrypting(ctx));

    return 1;

}

BLOCK_CIPHER_defs(des_ede, DES_EDE_KEY, NID_des_ede, 8, 16, 8, 64,

                  EVP_CIPH_RAND_KEY | EVP_CIPH_FLAG_DEFAULT_ASN1,

                  des_ede_init_key, NULL, NULL, NULL, des3_ctrl)

# 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

    BLOCK_CIPHER_defs(des_ede3, DES_EDE_KEY, NID_des_ede3, 8, 24, 8, 64,

                  EVP_CIPH_RAND_KEY | EVP_CIPH_FLAG_DEFAULT_ASN1,

                  des_ede3_init_key, NULL, NULL, NULL, des3_ctrl)

    BLOCK_CIPHER_def_cfb(des_ede3, DES_EDE_KEY, NID_des_ede3, 24, 8, 1,

                     EVP_CIPH_RAND_KEY | EVP_CIPH_FLAG_DEFAULT_ASN1,

                     des_ede3_init_key, NULL, NULL, NULL, des3_ctrl)

    BLOCK_CIPHER_def_cfb(des_ede3, DES_EDE_KEY, NID_des_ede3, 24, 8, 8,

                     EVP_CIPH_RAND_KEY | EVP_CIPH_FLAG_DEFAULT_ASN1,

                     des_ede3_init_key, NULL, NULL, NULL, des3_ctrl)

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_EDE_KEY *dat = 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(&deskey[0], &dat->ks1);

            des_t4_key_expand(&deskey[1], &dat->ks2);

            memcpy(&dat->ks3, &dat->ks1, sizeof(dat->ks1));

            dat->stream.cbc = enc ? des_t4_ede3_cbc_encrypt :

                des_t4_ede3_cbc_decrypt;

            return 1;

        }

    }

# endif

    DES_set_key_unchecked(&deskey[0], &dat->ks1);

    DES_set_key_unchecked(&deskey[1], &dat->ks2);

    memcpy(&dat->ks3, &dat->ks1, sizeof(dat->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_EDE_KEY *dat = 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(&deskey[0], &dat->ks1);

            des_t4_key_expand(&deskey[1], &dat->ks2);

            des_t4_key_expand(&deskey[2], &dat->ks3);

            dat->stream.cbc = enc ? des_t4_ede3_cbc_encrypt :

                des_t4_ede3_cbc_decrypt;

            return 1;

        }

    }

# endif

    DES_set_key_unchecked(&deskey[0], &dat->ks1);

    DES_set_key_unchecked(&deskey[1], &dat->ks2);

    DES_set_key_unchecked(&deskey[2], &dat->ks3);

    return 1;

}

static int des3_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)

{

    DES_cblock *deskey = ptr;

    int kl;

    switch (type) {

    case EVP_CTRL_RAND_KEY:

        kl = EVP_CIPHER_CTX_get_key_length(ctx);

        if (kl < 0 || RAND_priv_bytes(ptr, kl) <= 0)

            return 0;

        DES_set_odd_parity(deskey);

        if (kl >= 16)

            DES_set_odd_parity(deskey + 1);

        if (kl >= 24)

            DES_set_odd_parity(deskey + 2);

        return 1;

    default:

        return -1;

    }

}

const EVP_CIPHER *EVP_des_ede(void)

{

    return &des_ede_ecb;

}

const EVP_CIPHER *EVP_des_ede3(void)

{

    return &des_ede3_ecb;

}

# include <openssl/sha.h>

static const unsigned char wrap_iv[8] =

    { 0x4a, 0xdd, 0xa2, 0x2c, 0x79, 0xe8, 0x21, 0x05 };

static int des_ede3_unwrap(EVP_CIPHER_CTX *ctx, unsigned char *out,

                           const unsigned char *in, size_t inl)

{

    unsigned char icv[8], iv[8], sha1tmp[SHA_DIGEST_LENGTH];

    int rv = -1;

    if (inl < 24)

        return -1;

    if (out == NULL)

        return inl - 16;

    memcpy(ctx->iv, wrap_iv, 8);

    /* Decrypt first block which will end up as icv */

    des_ede_cbc_cipher(ctx, icv, in, 8);

    /* Decrypt central blocks */

    /*

     * If decrypting in place move whole output along a block so the next

     * des_ede_cbc_cipher is in place.

     */

    if (out == in) {

        memmove(out, out + 8, inl - 8);

        in -= 8;

    }

    des_ede_cbc_cipher(ctx, out, in + 8, inl - 16);

    /* Decrypt final block which will be IV */

    des_ede_cbc_cipher(ctx, iv, in + inl - 8, 8);

    /* Reverse order of everything */

    BUF_reverse(icv, NULL, 8);

    BUF_reverse(out, NULL, inl - 16);

    BUF_reverse(ctx->iv, iv, 8);

    /* Decrypt again using new IV */

    des_ede_cbc_cipher(ctx, out, out, inl - 16);

    des_ede_cbc_cipher(ctx, icv, icv, 8);

    if (ossl_sha1(out, inl - 16, sha1tmp)  /* Work out hash of first portion */

            && CRYPTO_memcmp(sha1tmp, icv, 8) == 0)

        rv = inl - 16;

    OPENSSL_cleanse(icv, 8);

    OPENSSL_cleanse(sha1tmp, SHA_DIGEST_LENGTH);

    OPENSSL_cleanse(iv, 8);

    OPENSSL_cleanse(ctx->iv, 8);

    if (rv == -1)

        OPENSSL_cleanse(out, inl - 16);

    return rv;

}

static int des_ede3_wrap(EVP_CIPHER_CTX *ctx, unsigned char *out,

                         const unsigned char *in, size_t inl)

{

    unsigned char sha1tmp[SHA_DIGEST_LENGTH];

    if (out == NULL)

        return inl + 16;

    /* Copy input to output buffer + 8 so we have space for IV */

    memmove(out + 8, in, inl);

    /* Work out ICV */

    if (!ossl_sha1(in, inl, sha1tmp))

        return -1;

    memcpy(out + inl + 8, sha1tmp, 8);

    OPENSSL_cleanse(sha1tmp, SHA_DIGEST_LENGTH);

    /* Generate random IV */

    if (RAND_bytes(ctx->iv, 8) <= 0)

        return -1;

    memcpy(out, ctx->iv, 8);

    /* Encrypt everything after IV in place */

    des_ede_cbc_cipher(ctx, out + 8, out + 8, inl + 8);

    BUF_reverse(out, NULL, inl + 16);

    memcpy(ctx->iv, wrap_iv, 8);

    des_ede_cbc_cipher(ctx, out, out, inl + 16);

    return inl + 16;

}

static int des_ede3_wrap_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                                const unsigned char *in, size_t inl)

{

    /*

     * Sanity check input length: we typically only wrap keys so EVP_MAXCHUNK

     * is more than will ever be needed. Also input length must be a multiple

     * of 8 bits.

     */

    if (inl >= EVP_MAXCHUNK || inl % 8)

        return -1;

    if (ossl_is_partially_overlapping(out, in, inl)) {

        ERR_raise(ERR_LIB_EVP, EVP_R_PARTIALLY_OVERLAPPING);

        return 0;

    }

    if (EVP_CIPHER_CTX_is_encrypting(ctx))

        return des_ede3_wrap(ctx, out, in, inl);

    else

        return des_ede3_unwrap(ctx, out, in, inl);

}

static const EVP_CIPHER des3_wrap = {

    NID_id_smime_alg_CMS3DESwrap,

    8, 24, 0,

    EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER

        | EVP_CIPH_FLAG_DEFAULT_ASN1,

    EVP_ORIG_GLOBAL,

    des_ede3_init_key, des_ede3_wrap_cipher,

    NULL,

    sizeof(DES_EDE_KEY),

    NULL, NULL, NULL, NULL

};

const EVP_CIPHER *EVP_des_ede3_wrap(void)

{

    return &des3_wrap;

}

#endif