providers/implementations/ciphers/cipher_rc2.c

   1 /*
   2  * Copyright 2019-2021 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 /* Dispatch functions for RC2 cipher modes ecb, cbc, ofb, cfb */
  11
  12 /*
  13  * RC2 low level APIs are deprecated for public use, but still ok for internal
  14  * use.
  15  */
  16 #include "internal/deprecated.h"
  17
  18 #include <openssl/proverr.h>
  19 #include "cipher_rc2.h"
  20 #include "prov/implementations.h"
  21 #include "prov/providercommon.h"
  22
  23 #define RC2_40_MAGIC    0xa0
  24 #define RC2_64_MAGIC    0x78
  25 #define RC2_128_MAGIC   0x3a
  26 #define RC2_FLAGS       PROV_CIPHER_FLAG_VARIABLE_LENGTH
  27
  28 static OSSL_FUNC_cipher_encrypt_init_fn rc2_einit;
  29 static OSSL_FUNC_cipher_decrypt_init_fn rc2_dinit;
  30 static OSSL_FUNC_cipher_freectx_fn rc2_freectx;
  31 static OSSL_FUNC_cipher_dupctx_fn rc2_dupctx;
  32 static OSSL_FUNC_cipher_gettable_ctx_params_fn rc2_gettable_ctx_params;
  33 static OSSL_FUNC_cipher_settable_ctx_params_fn rc2_settable_ctx_params;
  34 static OSSL_FUNC_cipher_set_ctx_params_fn rc2_set_ctx_params;
  35
  36 static void rc2_freectx(void *vctx)
  37 {
  38     PROV_RC2_CTX *ctx = (PROV_RC2_CTX *)vctx;
  39
  40     ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
  41     OPENSSL_clear_free(ctx,  sizeof(*ctx));
  42 }
  43
  44 static void *rc2_dupctx(void *ctx)
  45 {
  46     PROV_RC2_CTX *in = (PROV_RC2_CTX *)ctx;
  47     PROV_RC2_CTX *ret;
  48
  49     if (!ossl_prov_is_running())
  50         return NULL;
  51
  52     ret = OPENSSL_malloc(sizeof(*ret));
  53     if (ret == NULL)
  54         return NULL;
  55     *ret = *in;
  56
  57     return ret;
  58 }
  59
  60 static int rc2_keybits_to_magic(int keybits)
  61 {
  62     switch (keybits) {
  63     case 128:
  64         return RC2_128_MAGIC;
  65     case 64:
  66         return RC2_64_MAGIC;
  67     case 40:
  68         return RC2_40_MAGIC;
  69     }
  70     ERR_raise(ERR_LIB_PROV, PROV_R_UNSUPPORTED_KEY_SIZE);
  71     return 0;
  72 }
  73
  74 static int rc2_magic_to_keybits(int magic)
  75 {
  76     switch (magic) {
  77     case RC2_128_MAGIC:
  78         return 128;
  79     case RC2_64_MAGIC:
  80         return 64;
  81     case RC2_40_MAGIC:
  82         return 40;
  83     }
  84     ERR_raise(ERR_LIB_PROV, PROV_R_UNSUPPORTED_KEY_SIZE);
  85     return 0;
  86 }
  87
  88 static int rc2_einit(void *ctx, const unsigned char *key, size_t keylen,
  89                           const unsigned char *iv, size_t ivlen,
  90                           const OSSL_PARAM params[])
  91 {
  92     if (!ossl_cipher_generic_einit(ctx, key, keylen, iv, ivlen, NULL))
  93         return 0;
  94     return rc2_set_ctx_params(ctx, params);
  95 }
  96
  97 static int rc2_dinit(void *ctx, const unsigned char *key, size_t keylen,
  98                           const unsigned char *iv, size_t ivlen,
  99                           const OSSL_PARAM params[])
 100 {
 101     if (!ossl_cipher_generic_dinit(ctx, key, keylen, iv, ivlen, NULL))
 102         return 0;
 103     return rc2_set_ctx_params(ctx, params);
 104 }
 105
 106 static int rc2_get_ctx_params(void *vctx, OSSL_PARAM params[])
 107 {
 108     PROV_RC2_CTX *ctx = (PROV_RC2_CTX *)vctx;
 109     OSSL_PARAM *p;
 110
 111     if (!ossl_cipher_generic_get_ctx_params(vctx, params))
 112         return 0;
 113     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_RC2_KEYBITS);
 114     if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->key_bits)) {
 115         ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 116         return 0;
 117     }
 118     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_ALGORITHM_ID_PARAMS);
 119     if (p != NULL) {
 120         long num;
 121         int i;
 122         ASN1_TYPE *type;
 123         unsigned char *d = p->data;
 124         unsigned char **dd = d == NULL ? NULL : &d;
 125
 126         if (p->data_type != OSSL_PARAM_OCTET_STRING) {
 127             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 128             return 0;
 129         }
 130         if ((type = ASN1_TYPE_new()) == NULL) {
 131             ERR_raise(ERR_LIB_PROV, ERR_R_ASN1_LIB);
 132             return 0;
 133         }
 134
 135         /* Is this the original IV or the running IV? */
 136         num = rc2_keybits_to_magic(ctx->key_bits);
 137         if (!ASN1_TYPE_set_int_octetstring(type, num,
 138                                            ctx->base.iv, ctx->base.ivlen)) {
 139             ASN1_TYPE_free(type);
 140             ERR_raise(ERR_LIB_PROV, ERR_R_ASN1_LIB);
 141             return 0;
 142         }
 143         /*
 144          * IF the caller has a buffer, we pray to the gods they got the
 145          * size right.  There's no way to tell the i2d functions...
 146          */
 147         i = i2d_ASN1_TYPE(type, dd);
 148         if (i >= 0)
 149             p->return_size = (size_t)i;
 150
 151         ASN1_TYPE_free(type);
 152         if (i < 0) {
 153             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 154             return 0;
 155         }
 156     }
 157     return 1;
 158 }
 159
 160 static int rc2_set_ctx_params(void *vctx, const OSSL_PARAM params[])
 161 {
 162     PROV_RC2_CTX *ctx = (PROV_RC2_CTX *)vctx;
 163     const OSSL_PARAM *p;
 164
 165     if (params == NULL)
 166         return 1;
 167
 168     if (!ossl_cipher_var_keylen_set_ctx_params(vctx, params))
 169         return 0;
 170     p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_RC2_KEYBITS);
 171     if (p != NULL) {
 172          if (!OSSL_PARAM_get_size_t(p, &ctx->key_bits)) {
 173             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
 174             return 0;
 175         }
 176     }
 177     p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_ALGORITHM_ID_PARAMS);
 178     if (p != NULL) {
 179         ASN1_TYPE *type = NULL;
 180         long num = 0;
 181         const unsigned char *d = p->data;
 182         int ret = 1;
 183         unsigned char iv[16];
 184
 185         if (p->data_type != OSSL_PARAM_OCTET_STRING
 186             || ctx->base.ivlen > sizeof(iv)
 187             || (type = d2i_ASN1_TYPE(NULL, &d, p->data_size)) == NULL
 188             || ((size_t)ASN1_TYPE_get_int_octetstring(type, &num, iv,
 189                                                       ctx->base.ivlen)
 190                 != ctx->base.ivlen)
 191             || !ossl_cipher_generic_initiv(&ctx->base, iv, ctx->base.ivlen)
 192             || (ctx->key_bits = rc2_magic_to_keybits(num)) == 0) {
 193             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
 194             ret = 0;
 195         }
 196         ASN1_TYPE_free(type);
 197         if (ret == 0)
 198             return 0;
 199         /*
 200          * This code assumes that the caller will call
 201          * EVP_CipherInit_ex() with a non NULL key in order to setup a key that
 202          * uses the keylen and keybits that were set here.
 203          */
 204         ctx->base.keylen = ctx->key_bits / 8;
 205     }
 206     return 1;
 207 }
 208
 209 CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(rc2)
 210 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, NULL),
 211 OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_ALGORITHM_ID_PARAMS, NULL, 0),
 212 CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(rc2)
 213
 214 CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(rc2)
 215 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
 216 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, NULL),
 217 OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_ALGORITHM_ID_PARAMS, NULL, 0),
 218 CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(rc2)
 219
 220 #define IMPLEMENT_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits, blkbits,    \
 221                          ivbits, typ)                                          \
 222 static OSSL_FUNC_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params;   \
 223 static int alg##_##kbits##_##lcmode##_get_params(OSSL_PARAM params[])          \
 224 {                                                                              \
 225     return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE,    \
 226                                           flags, kbits, blkbits, ivbits);      \
 227 }                                                                              \
 228 static OSSL_FUNC_cipher_newctx_fn alg##_##kbits##_##lcmode##_newctx;           \
 229 static void * alg##_##kbits##_##lcmode##_newctx(void *provctx)                 \
 230 {                                                                              \
 231      PROV_##UCALG##_CTX *ctx;                                                  \
 232      if (!ossl_prov_is_running())                                              \
 233         return NULL;                                                           \
 234      ctx = OPENSSL_zalloc(sizeof(*ctx));                                       \
 235      if (ctx != NULL) {                                                        \
 236          ossl_cipher_generic_initkey(ctx, kbits, blkbits, ivbits,              \
 237                                 EVP_CIPH_##UCMODE##_MODE, flags,               \
 238                                 ossl_prov_cipher_hw_##alg##_##lcmode(kbits),   \
 239                                 NULL);                                         \
 240          ctx->key_bits = kbits;                                                \
 241      }                                                                         \
 242      return ctx;                                                               \
 243 }                                                                              \
 244 const OSSL_DISPATCH ossl_##alg##kbits##lcmode##_functions[] = {                \
 245     { OSSL_FUNC_CIPHER_NEWCTX,                                                 \
 246       (void (*)(void)) alg##_##kbits##_##lcmode##_newctx },                    \
 247     { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx },              \
 248     { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx },                \
 249     { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))rc2_einit },              \
 250     { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))rc2_dinit },              \
 251     { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))ossl_cipher_generic_##typ##_update },\
 252     { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))ossl_cipher_generic_##typ##_final },  \
 253     { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))ossl_cipher_generic_cipher },   \
 254     { OSSL_FUNC_CIPHER_GET_PARAMS,                                             \
 255       (void (*)(void)) alg##_##kbits##_##lcmode##_get_params },                \
 256     { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,                                        \
 257       (void (*)(void))ossl_cipher_generic_gettable_params },                   \
 258     { OSSL_FUNC_CIPHER_GET_CTX_PARAMS,                                         \
 259       (void (*)(void))rc2_get_ctx_params },                                    \
 260     { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,                                    \
 261       (void (*)(void))rc2_gettable_ctx_params },                               \
 262     { OSSL_FUNC_CIPHER_SET_CTX_PARAMS,                                         \
 263       (void (*)(void))rc2_set_ctx_params },                                    \
 264     { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,                                    \
 265      (void (*)(void))rc2_settable_ctx_params },                                \
 266     { 0, NULL }                                                                \
 267 };
 268
 269 /* ossl_rc2128ecb_functions */
 270 IMPLEMENT_cipher(rc2, RC2, ecb, ECB, RC2_FLAGS, 128, 64, 0, block)
 271 /* ossl_rc2128cbc_functions */
 272 IMPLEMENT_cipher(rc2, RC2, cbc, CBC, RC2_FLAGS, 128, 64, 64, block)
 273 /* ossl_rc240cbc_functions */
 274 IMPLEMENT_cipher(rc2, RC2, cbc, CBC, RC2_FLAGS, 40, 64, 64, block)
 275 /* ossl_rc264cbc_functions */
 276 IMPLEMENT_cipher(rc2, RC2, cbc, CBC, RC2_FLAGS, 64, 64, 64, block)
 277
 278 /* ossl_rc2128ofb128_functions */
 279 IMPLEMENT_cipher(rc2, RC2, ofb128, OFB, RC2_FLAGS, 128, 8, 64, stream)
 280 /* ossl_rc2128cfb128_functions */
 281 IMPLEMENT_cipher(rc2, RC2, cfb128, CFB, RC2_FLAGS, 128, 8, 64, stream)