225 lines
7.3 KiB
C
225 lines
7.3 KiB
C
/* crypto/evp/e_des.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "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 "evp_locl.h"
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#include <openssl/des.h>
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#include <openssl/rand.h>
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static int des_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 des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
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/* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */
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static int des_ecb_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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BLOCK_CIPHER_ecb_loop()
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DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), ctx->cipher_data, ctx->encrypt);
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return 1;
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}
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static int des_ofb_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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{
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DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
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(DES_cblock *)ctx->iv, &ctx->num);
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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_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data,
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(DES_cblock *)ctx->iv, &ctx->num);
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return 1;
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}
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static int des_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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{
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DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
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(DES_cblock *)ctx->iv, ctx->encrypt);
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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_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
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(DES_cblock *)ctx->iv, ctx->encrypt);
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return 1;
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}
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static int des_cfb64_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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{
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DES_cfb64_encrypt(in,out, (long)EVP_MAXCHUNK, ctx->cipher_data,
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(DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
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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_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
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(DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
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return 1;
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}
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/* Although we have a CFB-r implementation for DES, it doesn't pack the right
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way, so wrap it here */
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static int des_cfb1_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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size_t n,chunk=EVP_MAXCHUNK/8;
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unsigned char c[1],d[1];
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if (inl<chunk) chunk=inl;
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while (inl && inl>=chunk)
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{
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for(n=0 ; n < chunk*8; ++n)
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{
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c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
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DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv,
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ctx->encrypt);
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out[n/8]=(out[n/8]&~(0x80 >> (unsigned int)(n%8))) |
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((d[0]&0x80) >> (unsigned int)(n%8));
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}
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inl-=chunk;
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in +=chunk;
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out+=chunk;
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if (inl<chunk) chunk=inl;
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}
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return 1;
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}
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static int des_cfb8_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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{
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DES_cfb_encrypt(in,out,8,(long)EVP_MAXCHUNK,ctx->cipher_data,
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(DES_cblock *)ctx->iv,ctx->encrypt);
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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_cfb_encrypt(in,out,8,(long)inl,ctx->cipher_data,
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(DES_cblock *)ctx->iv,ctx->encrypt);
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return 1;
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}
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BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
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EVP_CIPH_RAND_KEY, des_init_key, NULL,
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EVP_CIPHER_set_asn1_iv,
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EVP_CIPHER_get_asn1_iv,
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des_ctrl)
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BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1,
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EVP_CIPH_RAND_KEY, des_init_key,NULL,
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EVP_CIPHER_set_asn1_iv,
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EVP_CIPHER_get_asn1_iv,des_ctrl)
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BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8,
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EVP_CIPH_RAND_KEY,des_init_key,NULL,
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EVP_CIPHER_set_asn1_iv,
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EVP_CIPHER_get_asn1_iv,des_ctrl)
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static int des_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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#ifdef EVP_CHECK_DES_KEY
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if(DES_set_key_checked(deskey,ctx->cipher_data) != 0)
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return 0;
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#else
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DES_set_key_unchecked(deskey,ctx->cipher_data);
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#endif
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return 1;
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}
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static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
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{
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switch(type)
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{
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case EVP_CTRL_RAND_KEY:
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if (RAND_bytes(ptr, 8) <= 0)
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return 0;
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DES_set_odd_parity((DES_cblock *)ptr);
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return 1;
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default:
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return -1;
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}
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}
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#endif
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