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235 lines
7.6 KiB
235 lines
7.6 KiB
/* 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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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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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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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) |
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return (RC2_128_MAGIC); |
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else if (i == 64) |
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return (RC2_64_MAGIC); |
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else if (i == 40) |
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return (RC2_40_MAGIC); |
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else |
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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) |
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return 128; |
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else if (i == RC2_64_MAGIC) |
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return 64; |
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else if (i == RC2_40_MAGIC) |
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return 40; |
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else { |
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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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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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return -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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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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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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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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# ifdef PBE_PRF_TEST |
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case EVP_CTRL_PBE_PRF_NID: |
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*(int *)ptr = NID_hmacWithMD5; |
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return 1; |
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# endif |
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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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