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 # 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     rc2_init_key,
  57     rc2_cbc_cipher,
  58     NULL,
  59     sizeof(EVP_RC2_KEY),
  60     rc2_set_asn1_type_and_iv,
  61     rc2_get_asn1_type_and_iv,
  62     rc2_ctrl,
  63     NULL
  64 };
  65
  66 static const EVP_CIPHER r2_40_cbc_cipher = {
  67     NID_rc2_40_cbc,
  68     8, 5 /* 40 bit */ , 8,
  69     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  70     rc2_init_key,
  71     rc2_cbc_cipher,
  72     NULL,
  73     sizeof(EVP_RC2_KEY),
  74     rc2_set_asn1_type_and_iv,
  75     rc2_get_asn1_type_and_iv,
  76     rc2_ctrl,
  77     NULL
  78 };
  79
  80 const EVP_CIPHER *EVP_rc2_64_cbc(void)
  81 {
  82     return &r2_64_cbc_cipher;
  83 }
  84
  85 const EVP_CIPHER *EVP_rc2_40_cbc(void)
  86 {
  87     return &r2_40_cbc_cipher;
  88 }
  89
  90 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  91                         const unsigned char *iv, int enc)
  92 {
  93     RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
  94                 key, data(ctx)->key_bits);
  95     return 1;
  96 }
  97
  98 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
  99 {
 100     int i;
 101
 102     if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)
 103         return 0;
 104     if (i == 128)
 105         return RC2_128_MAGIC;
 106     else if (i == 64)
 107         return RC2_64_MAGIC;
 108     else if (i == 40)
 109         return RC2_40_MAGIC;
 110     else
 111         return 0;
 112 }
 113
 114 static int rc2_magic_to_meth(int i)
 115 {
 116     if (i == RC2_128_MAGIC)
 117         return 128;
 118     else if (i == RC2_64_MAGIC)
 119         return 64;
 120     else if (i == RC2_40_MAGIC)
 121         return 40;
 122     else {
 123         EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
 124         return 0;
 125     }
 126 }
 127
 128 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 129 {
 130     long num = 0;
 131     int i = 0;
 132     int key_bits;
 133     unsigned int l;
 134     unsigned char iv[EVP_MAX_IV_LENGTH];
 135
 136     if (type != NULL) {
 137         l = EVP_CIPHER_CTX_iv_length(c);
 138         OPENSSL_assert(l <= sizeof(iv));
 139         i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
 140         if (i != (int)l)
 141             return -1;
 142         key_bits = rc2_magic_to_meth((int)num);
 143         if (!key_bits)
 144             return -1;
 145         if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
 146             return -1;
 147         if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits,
 148                                 NULL) <= 0
 149                 || EVP_CIPHER_CTX_set_key_length(c, key_bits / 8) <= 0)
 150             return -1;
 151     }
 152     return i;
 153 }
 154
 155 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 156 {
 157     long num;
 158     int i = 0, j;
 159
 160     if (type != NULL) {
 161         num = rc2_meth_to_magic(c);
 162         j = EVP_CIPHER_CTX_iv_length(c);
 163         i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);
 164     }
 165     return i;
 166 }
 167
 168 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 169 {
 170     switch (type) {
 171     case EVP_CTRL_INIT:
 172         data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
 173         return 1;
 174
 175     case EVP_CTRL_GET_RC2_KEY_BITS:
 176         *(int *)ptr = data(c)->key_bits;
 177         return 1;
 178
 179     case EVP_CTRL_SET_RC2_KEY_BITS:
 180         if (arg > 0) {
 181             data(c)->key_bits = arg;
 182             return 1;
 183         }
 184         return 0;
 185 # ifdef PBE_PRF_TEST
 186     case EVP_CTRL_PBE_PRF_NID:
 187         *(int *)ptr = NID_hmacWithMD5;
 188         return 1;
 189 # endif
 190
 191     default:
 192         return -1;
 193     }
 194 }
 195
 196 #endif