222 lines
6.7 KiB
C
222 lines
6.7 KiB
C
/* crypto/evp/e_rc2.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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#ifndef NO_RC2
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#include <stdio.h>
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#include "cryptlib.h"
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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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static int rc2_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 rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
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static int rc2_magic_to_meth(int i);
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static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
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static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
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static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
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IMPLEMENT_BLOCK_CIPHER(rc2, rc2.ks, RC2, rc2, NID_rc2,
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8,
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EVP_RC2_KEY_SIZE, 8,
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EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
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rc2_init_key, NULL,
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rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
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rc2_ctrl)
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#define RC2_40_MAGIC 0xa0
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#define RC2_64_MAGIC 0x78
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#define RC2_128_MAGIC 0x3a
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static EVP_CIPHER r2_64_cbc_cipher=
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{
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NID_rc2_64_cbc,
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8,8 /* 64 bit */,8,
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EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
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rc2_init_key,
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rc2_cbc_cipher,
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NULL,
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sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
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sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2)),
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rc2_set_asn1_type_and_iv,
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rc2_get_asn1_type_and_iv,
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rc2_ctrl,
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NULL
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};
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static EVP_CIPHER r2_40_cbc_cipher=
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{
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NID_rc2_40_cbc,
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8,5 /* 40 bit */,8,
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EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
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rc2_init_key,
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rc2_cbc_cipher,
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NULL,
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sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
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sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2)),
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rc2_set_asn1_type_and_iv,
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rc2_get_asn1_type_and_iv,
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rc2_ctrl,
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NULL
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};
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EVP_CIPHER *EVP_rc2_64_cbc(void)
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{
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return(&r2_64_cbc_cipher);
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}
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EVP_CIPHER *EVP_rc2_40_cbc(void)
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{
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return(&r2_40_cbc_cipher);
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}
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static int rc2_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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RC2_set_key(&(ctx->c.rc2.ks),EVP_CIPHER_CTX_key_length(ctx),
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key,ctx->c.rc2.key_bits);
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return 1;
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}
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static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
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{
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int i;
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EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
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if (i == 128) return(RC2_128_MAGIC);
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else if (i == 64) return(RC2_64_MAGIC);
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else if (i == 40) return(RC2_40_MAGIC);
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else return(0);
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}
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static int rc2_magic_to_meth(int i)
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{
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if (i == RC2_128_MAGIC) return 128;
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else if (i == RC2_64_MAGIC) return 64;
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else if (i == RC2_40_MAGIC) return 40;
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else
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{
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EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
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return(0);
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}
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}
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static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
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{
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long num=0;
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int i=0,l;
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int key_bits;
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unsigned char iv[EVP_MAX_IV_LENGTH];
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if (type != NULL)
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{
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l=EVP_CIPHER_CTX_iv_length(c);
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i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
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if (i != l)
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return(-1);
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key_bits =rc2_magic_to_meth((int)num);
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if (!key_bits)
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return(-1);
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if(i > 0) EVP_CipherInit(c, NULL, NULL, iv, -1);
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EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
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EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
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}
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return(i);
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}
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static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
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{
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long num;
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int i=0,j;
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if (type != NULL)
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{
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num=rc2_meth_to_magic(c);
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j=EVP_CIPHER_CTX_iv_length(c);
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i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
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}
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return(i);
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}
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static int rc2_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_INIT:
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c->c.rc2.key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
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return 1;
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case EVP_CTRL_GET_RC2_KEY_BITS:
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*(int *)ptr = c->c.rc2.key_bits;
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return 1;
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case EVP_CTRL_SET_RC2_KEY_BITS:
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if(arg > 0) {
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c->c.rc2.key_bits = arg;
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return 1;
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}
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return 0;
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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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