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2754597013
I have tried to convert 'len' type variable declarations to unsigned as a means to address these warnings when appropriate, but when in doubt I have used casts in the comparisons instead. The better solution (that would get us all lynched by API users) would be to go through and convert all the function prototypes and structure definitions to use unsigned variables except when signed is necessary. The proliferation of (signed) "int" for strictly non-negative uses is unfortunate.
233 lines
6.8 KiB
C
233 lines
6.8 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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#include <stdio.h>
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#include "cryptlib.h"
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#ifndef OPENSSL_NO_RC2
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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/rc2.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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typedef struct
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{
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int key_bits; /* effective key bits */
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RC2_KEY ks; /* key schedule */
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} EVP_RC2_KEY;
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#define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data)
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IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
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8,
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RC2_KEY_LENGTH, 8, 64,
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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 const 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_RC2_KEY),
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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 const 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_RC2_KEY),
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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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const 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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const 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(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
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key,data(ctx)->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;
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int key_bits;
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unsigned int l;
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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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OPENSSL_assert(l <= sizeof(iv));
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i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
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if (i != (int)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_ex(c, NULL, 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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{
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case EVP_CTRL_INIT:
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data(c)->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 = data(c)->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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{
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data(c)->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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