crypto/evp/e_rc2.c

   1 /*
   2  * Copyright 1995-2020 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 /*
  11  * RC2 low level APIs are deprecated for public use, but still ok for internal
  12  * use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <stdio.h>
  17 #include "internal/cryptlib.h"
  18
  19 #ifndef OPENSSL_NO_RC2
  20
  21 # include <openssl/evp.h>
  22 # include <openssl/objects.h>
  23 # include "crypto/evp.h"
  24 # include <openssl/rc2.h>
  25
  26 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  27                         const unsigned char *iv, int enc);
  28 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
  29 static int rc2_magic_to_meth(int i);
  30 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  31 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  32 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  33
  34 typedef struct {
  35     int key_bits;               /* effective key bits */
  36     RC2_KEY ks;                 /* key schedule */
  37 } EVP_RC2_KEY;
  38
  39 # define data(ctx)       EVP_C_DATA(EVP_RC2_KEY,ctx)
  40
  41 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
  42                        8,
  43                        RC2_KEY_LENGTH, 8, 64,
  44                        EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  45                        rc2_init_key, NULL,
  46                        rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
  47                        rc2_ctrl)
  48 # define RC2_40_MAGIC    0xa0
  49 # define RC2_64_MAGIC    0x78
  50 # define RC2_128_MAGIC   0x3a
  51 static const EVP_CIPHER r2_64_cbc_cipher = {
  52     NID_rc2_64_cbc,
  53     8, 8 /* 64 bit */ , 8,
  54     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  55     rc2_init_key,
  56     rc2_cbc_cipher,
  57     NULL,
  58     sizeof(EVP_RC2_KEY),
  59     rc2_set_asn1_type_and_iv,
  60     rc2_get_asn1_type_and_iv,
  61     rc2_ctrl,
  62     NULL
  63 };
  64
  65 static const EVP_CIPHER r2_40_cbc_cipher = {
  66     NID_rc2_40_cbc,
  67     8, 5 /* 40 bit */ , 8,
  68     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  69     rc2_init_key,
  70     rc2_cbc_cipher,
  71     NULL,
  72     sizeof(EVP_RC2_KEY),
  73     rc2_set_asn1_type_and_iv,
  74     rc2_get_asn1_type_and_iv,
  75     rc2_ctrl,
  76     NULL
  77 };
  78
  79 const EVP_CIPHER *EVP_rc2_64_cbc(void)
  80 {
  81     return &r2_64_cbc_cipher;
  82 }
  83
  84 const EVP_CIPHER *EVP_rc2_40_cbc(void)
  85 {
  86     return &r2_40_cbc_cipher;
  87 }
  88
  89 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  90                         const unsigned char *iv, int enc)
  91 {
  92     RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
  93                 key, data(ctx)->key_bits);
  94     return 1;
  95 }
  96
  97 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
  98 {
  99     int i;
 100
 101     if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)
 102         return 0;
 103     if (i == 128)
 104         return RC2_128_MAGIC;
 105     else if (i == 64)
 106         return RC2_64_MAGIC;
 107     else if (i == 40)
 108         return RC2_40_MAGIC;
 109     else
 110         return 0;
 111 }
 112
 113 static int rc2_magic_to_meth(int i)
 114 {
 115     if (i == RC2_128_MAGIC)
 116         return 128;
 117     else if (i == RC2_64_MAGIC)
 118         return 64;
 119     else if (i == RC2_40_MAGIC)
 120         return 40;
 121     else {
 122         EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
 123         return 0;
 124     }
 125 }
 126
 127 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 128 {
 129     long num = 0;
 130     int i = 0;
 131     int key_bits;
 132     unsigned int l;
 133     unsigned char iv[EVP_MAX_IV_LENGTH];
 134
 135     if (type != NULL) {
 136         l = EVP_CIPHER_CTX_iv_length(c);
 137         OPENSSL_assert(l <= sizeof(iv));
 138         i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
 139         if (i != (int)l)
 140             return -1;
 141         key_bits = rc2_magic_to_meth((int)num);
 142         if (!key_bits)
 143             return -1;
 144         if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
 145             return -1;
 146         if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits,
 147                                 NULL) <= 0
 148                 || EVP_CIPHER_CTX_set_key_length(c, key_bits / 8) <= 0)
 149             return -1;
 150     }
 151     return i;
 152 }
 153
 154 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 155 {
 156     long num;
 157     int i = 0, j;
 158
 159     if (type != NULL) {
 160         num = rc2_meth_to_magic(c);
 161         j = EVP_CIPHER_CTX_iv_length(c);
 162         i = ASN1_TYPE_set_int_octetstring(type, num,
 163                                           (unsigned char *)EVP_CIPHER_CTX_original_iv(c),
 164                                           j);
 165     }
 166     return i;
 167 }
 168
 169 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 170 {
 171     switch (type) {
 172     case EVP_CTRL_INIT:
 173         data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
 174         return 1;
 175
 176     case EVP_CTRL_GET_RC2_KEY_BITS:
 177         *(int *)ptr = data(c)->key_bits;
 178         return 1;
 179
 180     case EVP_CTRL_SET_RC2_KEY_BITS:
 181         if (arg > 0) {
 182             data(c)->key_bits = arg;
 183             return 1;
 184         }
 185         return 0;
 186 # ifdef PBE_PRF_TEST
 187     case EVP_CTRL_PBE_PRF_NID:
 188         *(int *)ptr = NID_hmacWithMD5;
 189         return 1;
 190 # endif
 191
 192     default:
 193         return -1;
 194     }
 195 }
 196
 197 #endif