7f0606016c
enhance and tidy up the EVP interface. This patch adds initial support for variable length ciphers and changes S/MIME code to use this. Some other library functions need modifying to support use of modified cipher parameters. Also need to change all the cipher functions that should return error codes, but currenly don't. And of course it needs extensive testing...
223 lines
6.8 KiB
C
223 lines
6.8 KiB
C
/* crypto/evp/e_cbc_r2.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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static void rc2_cbc_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
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unsigned char *iv,int enc);
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static void rc2_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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unsigned char *in, unsigned int inl);
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static int rc2_meth_to_magic(const EVP_CIPHER *e);
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static EVP_CIPHER *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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#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_cbc_cipher=
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{
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NID_rc2_cbc,
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8,EVP_RC2_KEY_SIZE,8,
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EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH,
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rc2_cbc_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_ks)),
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rc2_set_asn1_type_and_iv,
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rc2_get_asn1_type_and_iv,
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NULL
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};
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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,
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rc2_cbc_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_ks)),
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rc2_set_asn1_type_and_iv,
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rc2_get_asn1_type_and_iv,
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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,
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rc2_cbc_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_ks)),
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rc2_set_asn1_type_and_iv,
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rc2_get_asn1_type_and_iv,
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NULL
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};
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EVP_CIPHER *EVP_rc2_cbc(void)
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{
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return(&r2_cbc_cipher);
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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 void rc2_cbc_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
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unsigned char *iv, int enc)
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{
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if (iv != NULL)
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memcpy(&(ctx->oiv[0]),iv,8);
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memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
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if (key != NULL)
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RC2_set_key(&(ctx->c.rc2_ks),EVP_CIPHER_CTX_key_length(ctx),
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key,EVP_CIPHER_key_length(ctx->cipher)*8);
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}
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static void rc2_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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unsigned char *in, unsigned int inl)
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{
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RC2_cbc_encrypt(
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in,out,(long)inl,
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&(ctx->c.rc2_ks),&(ctx->iv[0]),
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ctx->encrypt);
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}
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static int rc2_meth_to_magic(const EVP_CIPHER *e)
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{
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int i;
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i=EVP_CIPHER_key_length(e);
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if (i == 16) return(RC2_128_MAGIC);
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else if (i == 8) return(RC2_64_MAGIC);
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else if (i == 5) return(RC2_40_MAGIC);
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else return(0);
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}
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static EVP_CIPHER *rc2_magic_to_meth(int i)
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{
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if (i == RC2_128_MAGIC) return(EVP_rc2_cbc());
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else if (i == RC2_64_MAGIC) return(EVP_rc2_64_cbc());
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else if (i == RC2_40_MAGIC) return(EVP_rc2_40_cbc());
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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(NULL);
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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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EVP_CIPHER *e;
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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,c->oiv,l);
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if (i != l)
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return(-1);
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else if (i > 0)
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memcpy(c->iv,c->oiv,l);
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e=rc2_magic_to_meth((int)num);
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if (e == NULL)
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return(-1);
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if (e != EVP_CIPHER_CTX_cipher(c))
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{
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EVP_CIPHER_CTX_cipher(c)=e;
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EVP_CIPHER_CTX_set_key_length(c, EVP_CIPHER_key_length(c));
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rc2_cbc_init_key(c,NULL,NULL,1);
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}
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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(EVP_CIPHER_CTX_cipher(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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#endif
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