crypto/evp/e_rc2.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12
  13 #ifndef OPENSSL_NO_RC2
  14
  15 # include <openssl/evp.h>
  16 # include <openssl/objects.h>
  17 # include "internal/evp_int.h"
  18 # include <openssl/rc2.h>
  19
  20 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  21                         const unsigned char *iv, int enc);
  22 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
  23 static int rc2_magic_to_meth(int i);
  24 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  25 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  26 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  27
  28 typedef struct {
  29     int key_bits;               /* effective key bits */
  30     RC2_KEY ks;                 /* key schedule */
  31 } EVP_RC2_KEY;
  32
  33 # define data(ctx)       EVP_C_DATA(EVP_RC2_KEY,ctx)
  34
  35 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
  36                        8,
  37                        RC2_KEY_LENGTH, 8, 64,
  38                        EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  39                        rc2_init_key, NULL,
  40                        rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
  41                        rc2_ctrl)
  42 # define RC2_40_MAGIC    0xa0
  43 # define RC2_64_MAGIC    0x78
  44 # define RC2_128_MAGIC   0x3a
  45 static const EVP_CIPHER r2_64_cbc_cipher = {
  46     NID_rc2_64_cbc,
  47     8, 8 /* 64 bit */ , 8,
  48     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  49     rc2_init_key,
  50     rc2_cbc_cipher,
  51     NULL,
  52     sizeof(EVP_RC2_KEY),
  53     rc2_set_asn1_type_and_iv,
  54     rc2_get_asn1_type_and_iv,
  55     rc2_ctrl,
  56     NULL
  57 };
  58
  59 static const EVP_CIPHER r2_40_cbc_cipher = {
  60     NID_rc2_40_cbc,
  61     8, 5 /* 40 bit */ , 8,
  62     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  63     rc2_init_key,
  64     rc2_cbc_cipher,
  65     NULL,
  66     sizeof(EVP_RC2_KEY),
  67     rc2_set_asn1_type_and_iv,
  68     rc2_get_asn1_type_and_iv,
  69     rc2_ctrl,
  70     NULL
  71 };
  72
  73 const EVP_CIPHER *EVP_rc2_64_cbc(void)
  74 {
  75     return &r2_64_cbc_cipher;
  76 }
  77
  78 const EVP_CIPHER *EVP_rc2_40_cbc(void)
  79 {
  80     return &r2_40_cbc_cipher;
  81 }
  82
  83 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  84                         const unsigned char *iv, int enc)
  85 {
  86     RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
  87                 key, data(ctx)->key_bits);
  88     return 1;
  89 }
  90
  91 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
  92 {
  93     int i;
  94
  95     if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)
  96         return 0;
  97     if (i == 128)
  98         return RC2_128_MAGIC;
  99     else if (i == 64)
 100         return RC2_64_MAGIC;
 101     else if (i == 40)
 102         return RC2_40_MAGIC;
 103     else
 104         return 0;
 105 }
 106
 107 static int rc2_magic_to_meth(int i)
 108 {
 109     if (i == RC2_128_MAGIC)
 110         return 128;
 111     else if (i == RC2_64_MAGIC)
 112         return 64;
 113     else if (i == RC2_40_MAGIC)
 114         return 40;
 115     else {
 116         EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
 117         return 0;
 118     }
 119 }
 120
 121 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 122 {
 123     long num = 0;
 124     int i = 0;
 125     int key_bits;
 126     unsigned int l;
 127     unsigned char iv[EVP_MAX_IV_LENGTH];
 128
 129     if (type != NULL) {
 130         l = EVP_CIPHER_CTX_iv_length(c);
 131         OPENSSL_assert(l <= sizeof(iv));
 132         i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
 133         if (i != (int)l)
 134             return -1;
 135         key_bits = rc2_magic_to_meth((int)num);
 136         if (!key_bits)
 137             return -1;
 138         if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
 139             return -1;
 140         if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits,
 141                                 NULL) <= 0
 142                 || EVP_CIPHER_CTX_set_key_length(c, key_bits / 8) <= 0)
 143             return -1;
 144     }
 145     return i;
 146 }
 147
 148 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 149 {
 150     long num;
 151     int i = 0, j;
 152
 153     if (type != NULL) {
 154         num = rc2_meth_to_magic(c);
 155         j = EVP_CIPHER_CTX_iv_length(c);
 156         i = ASN1_TYPE_set_int_octetstring(type, num,
 157                                           (unsigned char *)EVP_CIPHER_CTX_original_iv(c),
 158                                           j);
 159     }
 160     return i;
 161 }
 162
 163 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 164 {
 165     switch (type) {
 166     case EVP_CTRL_INIT:
 167         data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
 168         return 1;
 169
 170     case EVP_CTRL_GET_RC2_KEY_BITS:
 171         *(int *)ptr = data(c)->key_bits;
 172         return 1;
 173
 174     case EVP_CTRL_SET_RC2_KEY_BITS:
 175         if (arg > 0) {
 176             data(c)->key_bits = arg;
 177             return 1;
 178         }
 179         return 0;
 180 # ifdef PBE_PRF_TEST
 181     case EVP_CTRL_PBE_PRF_NID:
 182         *(int *)ptr = NID_hmacWithMD5;
 183         return 1;
 184 # endif
 185
 186     default:
 187         return -1;
 188     }
 189 }
 190
 191 #endif