[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 |
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| 13 | #ifndef OPENSSL_NO_DES
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| 14 |
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| 15 | # include <openssl/evp.h>
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| 16 | # include <openssl/objects.h>
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| 17 | # include "internal/evp_int.h"
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| 18 | # include <openssl/des.h>
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| 19 |
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| 20 | static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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| 21 | const unsigned char *iv, int enc);
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| 22 | static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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| 23 | const unsigned char *in, size_t inl);
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| 24 |
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| 25 | typedef struct {
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| 26 | DES_key_schedule ks; /* key schedule */
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| 27 | DES_cblock inw;
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| 28 | DES_cblock outw;
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| 29 | } DESX_CBC_KEY;
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| 30 |
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| 31 | # define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
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| 32 |
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| 33 | static const EVP_CIPHER d_xcbc_cipher = {
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| 34 | NID_desx_cbc,
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| 35 | 8, 24, 8,
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| 36 | EVP_CIPH_CBC_MODE,
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| 37 | desx_cbc_init_key,
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| 38 | desx_cbc_cipher,
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| 39 | NULL,
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| 40 | sizeof(DESX_CBC_KEY),
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| 41 | EVP_CIPHER_set_asn1_iv,
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| 42 | EVP_CIPHER_get_asn1_iv,
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| 43 | NULL,
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| 44 | NULL
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| 45 | };
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| 46 |
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| 47 | const EVP_CIPHER *EVP_desx_cbc(void)
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| 48 | {
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| 49 | return (&d_xcbc_cipher);
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| 50 | }
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| 51 |
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| 52 | static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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| 53 | const unsigned char *iv, int enc)
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| 54 | {
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| 55 | DES_cblock *deskey = (DES_cblock *)key;
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| 56 |
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| 57 | DES_set_key_unchecked(deskey, &data(ctx)->ks);
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| 58 | memcpy(&data(ctx)->inw[0], &key[8], 8);
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| 59 | memcpy(&data(ctx)->outw[0], &key[16], 8);
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| 60 |
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| 61 | return 1;
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| 62 | }
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| 63 |
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| 64 | static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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| 65 | const unsigned char *in, size_t inl)
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| 66 | {
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| 67 | while (inl >= EVP_MAXCHUNK) {
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| 68 | DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
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| 69 | (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
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| 70 | &data(ctx)->inw, &data(ctx)->outw,
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| 71 | EVP_CIPHER_CTX_encrypting(ctx));
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| 72 | inl -= EVP_MAXCHUNK;
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| 73 | in += EVP_MAXCHUNK;
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| 74 | out += EVP_MAXCHUNK;
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| 75 | }
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| 76 | if (inl)
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| 77 | DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
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| 78 | (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
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| 79 | &data(ctx)->inw, &data(ctx)->outw,
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| 80 | EVP_CIPHER_CTX_encrypting(ctx));
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| 81 | return 1;
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| 82 | }
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| 83 | #endif
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