| /* 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)) |
| return -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; |
| # ifdef PBE_PRF_TEST |
| case EVP_CTRL_PBE_PRF_NID: |
| *(int *)ptr = NID_hmacWithMD5; |
| return 1; |
| # endif |
| |
| default: |
| return -1; |
| } |
| } |
| |
| #endif |