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84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#ifndef OPENSSL_NO_DES
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# include <openssl/evp.h>
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# include <openssl/objects.h>
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# include "internal/evp_int.h"
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# include <openssl/des.h>
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static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc);
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static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t inl);
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typedef struct {
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DES_key_schedule ks; /* key schedule */
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DES_cblock inw;
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DES_cblock outw;
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} DESX_CBC_KEY;
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# define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
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static const EVP_CIPHER d_xcbc_cipher = {
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NID_desx_cbc,
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8, 24, 8,
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EVP_CIPH_CBC_MODE,
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desx_cbc_init_key,
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desx_cbc_cipher,
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NULL,
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sizeof(DESX_CBC_KEY),
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EVP_CIPHER_set_asn1_iv,
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EVP_CIPHER_get_asn1_iv,
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NULL,
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NULL
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};
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const EVP_CIPHER *EVP_desx_cbc(void)
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{
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return (&d_xcbc_cipher);
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}
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static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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DES_cblock *deskey = (DES_cblock *)key;
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DES_set_key_unchecked(deskey, &data(ctx)->ks);
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memcpy(&data(ctx)->inw[0], &key[8], 8);
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memcpy(&data(ctx)->outw[0], &key[16], 8);
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return 1;
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}
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static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t inl)
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{
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while (inl >= EVP_MAXCHUNK) {
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DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
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(DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
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&data(ctx)->inw, &data(ctx)->outw,
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EVP_CIPHER_CTX_encrypting(ctx));
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inl -= EVP_MAXCHUNK;
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in += EVP_MAXCHUNK;
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out += EVP_MAXCHUNK;
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}
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if (inl)
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DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
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(DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
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&data(ctx)->inw, &data(ctx)->outw,
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EVP_CIPHER_CTX_encrypting(ctx));
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return 1;
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}
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#endif
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