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223 lines
8.2 KiB
223 lines
8.2 KiB
/* 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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/* |
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* Because of various casts and different names can't use |
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* IMPLEMENT_BLOCK_CIPHER |
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*/ |
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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), |
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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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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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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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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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/* |
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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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*/ |
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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) |
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chunk = inl; |
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while (inl && inl >= chunk) { |
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for (n = 0; n < chunk * 8; ++n) { |
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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, |
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(DES_cblock *)ctx->iv, ctx->encrypt); |
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out[n / 8] = |
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(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) |
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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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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, EVP_CIPHER_get_asn1_iv, 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, 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, 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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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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