ref: bae3ac29fc39bc36329abf1823004c0d79b2f6f0
dir: /sys/src/ape/lib/openssl/crypto/evp/e_rc2.c/
/* crypto/evp/e_rc2.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include "cryptlib.h"
#ifndef OPENSSL_NO_RC2
#include <openssl/evp.h>
#include <openssl/objects.h>
#include "evp_locl.h"
#include <openssl/rc2.h>
static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv,int enc);
static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
static int rc2_magic_to_meth(int i);
static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
typedef struct
{
int key_bits; /* effective key bits */
RC2_KEY ks; /* key schedule */
} EVP_RC2_KEY;
#define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data)
IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
8,
RC2_KEY_LENGTH, 8, 64,
EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
rc2_init_key, NULL,
rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
rc2_ctrl)
#define RC2_40_MAGIC 0xa0
#define RC2_64_MAGIC 0x78
#define RC2_128_MAGIC 0x3a
static const EVP_CIPHER r2_64_cbc_cipher=
{
NID_rc2_64_cbc,
8,8 /* 64 bit */,8,
EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
rc2_init_key,
rc2_cbc_cipher,
NULL,
sizeof(EVP_RC2_KEY),
rc2_set_asn1_type_and_iv,
rc2_get_asn1_type_and_iv,
rc2_ctrl,
NULL
};
static const EVP_CIPHER r2_40_cbc_cipher=
{
NID_rc2_40_cbc,
8,5 /* 40 bit */,8,
EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
rc2_init_key,
rc2_cbc_cipher,
NULL,
sizeof(EVP_RC2_KEY),
rc2_set_asn1_type_and_iv,
rc2_get_asn1_type_and_iv,
rc2_ctrl,
NULL
};
const EVP_CIPHER *EVP_rc2_64_cbc(void)
{
return(&r2_64_cbc_cipher);
}
const EVP_CIPHER *EVP_rc2_40_cbc(void)
{
return(&r2_40_cbc_cipher);
}
static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
key,data(ctx)->key_bits);
return 1;
}
static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
{
int i;
EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
if (i == 128) return(RC2_128_MAGIC);
else if (i == 64) return(RC2_64_MAGIC);
else if (i == 40) return(RC2_40_MAGIC);
else return(0);
}
static int rc2_magic_to_meth(int i)
{
if (i == RC2_128_MAGIC) return 128;
else if (i == RC2_64_MAGIC) return 64;
else if (i == RC2_40_MAGIC) return 40;
else
{
EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
return(0);
}
}
static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
{
long num=0;
int i=0;
int key_bits;
unsigned int l;
unsigned char iv[EVP_MAX_IV_LENGTH];
if (type != NULL)
{
l=EVP_CIPHER_CTX_iv_length(c);
OPENSSL_assert(l <= sizeof(iv));
i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
if (i != (int)l)
return(-1);
key_bits =rc2_magic_to_meth((int)num);
if (!key_bits)
return(-1);
if(i > 0) EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1);
EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
}
return(i);
}
static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
{
long num;
int i=0,j;
if (type != NULL)
{
num=rc2_meth_to_magic(c);
j=EVP_CIPHER_CTX_iv_length(c);
i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
}
return(i);
}
static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
switch(type)
{
case EVP_CTRL_INIT:
data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
return 1;
case EVP_CTRL_GET_RC2_KEY_BITS:
*(int *)ptr = data(c)->key_bits;
return 1;
case EVP_CTRL_SET_RC2_KEY_BITS:
if(arg > 0)
{
data(c)->key_bits = arg;
return 1;
}
return 0;
default:
return -1;
}
}
#endif