crypto/evp/e_rc2.c

   1 /*
   2  * Copyright 1995-2021 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 # include "evp_local.h"
  26
  27 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  28                         const unsigned char *iv, int enc);
  29 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
  30 static int rc2_magic_to_meth(int i);
  31 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  32 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  33 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  34
  35 typedef struct {
  36     int key_bits;               /* effective key bits */
  37     RC2_KEY ks;                 /* key schedule */
  38 } EVP_RC2_KEY;
  39
  40 # define data(ctx)       EVP_C_DATA(EVP_RC2_KEY,ctx)
  41
  42 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
  43                        8,
  44                        RC2_KEY_LENGTH, 8, 64,
  45                        EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  46                        rc2_init_key, NULL,
  47                        rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
  48                        rc2_ctrl)
  49 # define RC2_40_MAGIC    0xa0
  50 # define RC2_64_MAGIC    0x78
  51 # define RC2_128_MAGIC   0x3a
  52 static const EVP_CIPHER r2_64_cbc_cipher = {
  53     NID_rc2_64_cbc,
  54     8, 8 /* 64 bit */ , 8,
  55     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  56     EVP_ORIG_GLOBAL,
  57     rc2_init_key,
  58     rc2_cbc_cipher,
  59     NULL,
  60     sizeof(EVP_RC2_KEY),
  61     rc2_set_asn1_type_and_iv,
  62     rc2_get_asn1_type_and_iv,
  63     rc2_ctrl,
  64     NULL
  65 };
  66
  67 static const EVP_CIPHER r2_40_cbc_cipher = {
  68     NID_rc2_40_cbc,
  69     8, 5 /* 40 bit */ , 8,
  70     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  71     EVP_ORIG_GLOBAL,
  72     rc2_init_key,
  73     rc2_cbc_cipher,
  74     NULL,
  75     sizeof(EVP_RC2_KEY),
  76     rc2_set_asn1_type_and_iv,
  77     rc2_get_asn1_type_and_iv,
  78     rc2_ctrl,
  79     NULL
  80 };
  81
  82 const EVP_CIPHER *EVP_rc2_64_cbc(void)
  83 {
  84     return &r2_64_cbc_cipher;
  85 }
  86
  87 const EVP_CIPHER *EVP_rc2_40_cbc(void)
  88 {
  89     return &r2_40_cbc_cipher;
  90 }
  91
  92 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  93                         const unsigned char *iv, int enc)
  94 {
  95     RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_get_key_length(ctx),
  96                 key, data(ctx)->key_bits);
  97     return 1;
  98 }
  99
 100 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
 101 {
 102     int i;
 103
 104     if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)
 105         return 0;
 106     if (i == 128)
 107         return RC2_128_MAGIC;
 108     else if (i == 64)
 109         return RC2_64_MAGIC;
 110     else if (i == 40)
 111         return RC2_40_MAGIC;
 112     else
 113         return 0;
 114 }
 115
 116 static int rc2_magic_to_meth(int i)
 117 {
 118     if (i == RC2_128_MAGIC)
 119         return 128;
 120     else if (i == RC2_64_MAGIC)
 121         return 64;
 122     else if (i == RC2_40_MAGIC)
 123         return 40;
 124     else {
 125         ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEY_SIZE);
 126         return 0;
 127     }
 128 }
 129
 130 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 131 {
 132     long num = 0;
 133     int i = 0;
 134     int key_bits;
 135     unsigned int l;
 136     unsigned char iv[EVP_MAX_IV_LENGTH];
 137
 138     if (type != NULL) {
 139         l = EVP_CIPHER_CTX_get_iv_length(c);
 140         OPENSSL_assert(l <= sizeof(iv));
 141         i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
 142         if (i != (int)l)
 143             return -1;
 144         key_bits = rc2_magic_to_meth((int)num);
 145         if (!key_bits)
 146             return -1;
 147         if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
 148             return -1;
 149         if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits,
 150                                 NULL) <= 0
 151                 || EVP_CIPHER_CTX_set_key_length(c, key_bits / 8) <= 0)
 152             return -1;
 153     }
 154     return i;
 155 }
 156
 157 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 158 {
 159     long num;
 160     int i = 0, j;
 161
 162     if (type != NULL) {
 163         num = rc2_meth_to_magic(c);
 164         j = EVP_CIPHER_CTX_get_iv_length(c);
 165         i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);
 166     }
 167     return i;
 168 }
 169
 170 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 171 {
 172     switch (type) {
 173     case EVP_CTRL_INIT:
 174         data(c)->key_bits = EVP_CIPHER_CTX_get_key_length(c) * 8;
 175         return 1;
 176
 177     case EVP_CTRL_GET_RC2_KEY_BITS:
 178         *(int *)ptr = data(c)->key_bits;
 179         return 1;
 180
 181     case EVP_CTRL_SET_RC2_KEY_BITS:
 182         if (arg > 0) {
 183             data(c)->key_bits = arg;
 184             return 1;
 185         }
 186         return 0;
 187 # ifdef PBE_PRF_TEST
 188     case EVP_CTRL_PBE_PRF_NID:
 189         *(int *)ptr = NID_hmacWithMD5;
 190         return 1;
 191 # endif
 192
 193     default:
 194         return -1;
 195     }
 196 }
 197
 198 #endif