crypto/evp/evp_lib.c

   1 /* crypto/evp/evp_lib.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/evp.h>
  62 #include <openssl/objects.h>
  63
  64 int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  65 {
  66     int ret;
  67
  68     if (c->cipher->set_asn1_parameters != NULL)
  69         ret = c->cipher->set_asn1_parameters(c, type);
  70     else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
  71         if (EVP_CIPHER_CTX_mode(c) == EVP_CIPH_WRAP_MODE) {
  72             ASN1_TYPE_set(type, V_ASN1_NULL, NULL);
  73             ret = 1;
  74         } else
  75             ret = EVP_CIPHER_set_asn1_iv(c, type);
  76     } else
  77         ret = -1;
  78     return (ret);
  79 }
  80
  81 int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  82 {
  83     int ret;
  84
  85     if (c->cipher->get_asn1_parameters != NULL)
  86         ret = c->cipher->get_asn1_parameters(c, type);
  87     else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {
  88         if (EVP_CIPHER_CTX_mode(c) == EVP_CIPH_WRAP_MODE)
  89             return 1;
  90         ret = EVP_CIPHER_get_asn1_iv(c, type);
  91     } else
  92         ret = -1;
  93     return (ret);
  94 }
  95
  96 int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  97 {
  98     int i = 0;
  99     unsigned int l;
 100
 101     if (type != NULL) {
 102         l = EVP_CIPHER_CTX_iv_length(c);
 103         OPENSSL_assert(l <= sizeof(c->iv));
 104         i = ASN1_TYPE_get_octetstring(type, c->oiv, l);
 105         if (i != (int)l)
 106             return (-1);
 107         else if (i > 0)
 108             memcpy(c->iv, c->oiv, l);
 109     }
 110     return (i);
 111 }
 112
 113 int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 114 {
 115     int i = 0;
 116     unsigned int j;
 117
 118     if (type != NULL) {
 119         j = EVP_CIPHER_CTX_iv_length(c);
 120         OPENSSL_assert(j <= sizeof(c->iv));
 121         i = ASN1_TYPE_set_octetstring(type, c->oiv, j);
 122     }
 123     return (i);
 124 }
 125
 126 /* Convert the various cipher NIDs and dummies to a proper OID NID */
 127 int EVP_CIPHER_type(const EVP_CIPHER *ctx)
 128 {
 129     int nid;
 130     ASN1_OBJECT *otmp;
 131     nid = EVP_CIPHER_nid(ctx);
 132
 133     switch (nid) {
 134
 135     case NID_rc2_cbc:
 136     case NID_rc2_64_cbc:
 137     case NID_rc2_40_cbc:
 138
 139         return NID_rc2_cbc;
 140
 141     case NID_rc4:
 142     case NID_rc4_40:
 143
 144         return NID_rc4;
 145
 146     case NID_aes_128_cfb128:
 147     case NID_aes_128_cfb8:
 148     case NID_aes_128_cfb1:
 149
 150         return NID_aes_128_cfb128;
 151
 152     case NID_aes_192_cfb128:
 153     case NID_aes_192_cfb8:
 154     case NID_aes_192_cfb1:
 155
 156         return NID_aes_192_cfb128;
 157
 158     case NID_aes_256_cfb128:
 159     case NID_aes_256_cfb8:
 160     case NID_aes_256_cfb1:
 161
 162         return NID_aes_256_cfb128;
 163
 164     case NID_des_cfb64:
 165     case NID_des_cfb8:
 166     case NID_des_cfb1:
 167
 168         return NID_des_cfb64;
 169
 170     case NID_des_ede3_cfb64:
 171     case NID_des_ede3_cfb8:
 172     case NID_des_ede3_cfb1:
 173
 174         return NID_des_cfb64;
 175
 176     default:
 177         /* Check it has an OID and it is valid */
 178         otmp = OBJ_nid2obj(nid);
 179         if (OBJ_get0_data(otmp) == NULL)
 180             nid = NID_undef;
 181         ASN1_OBJECT_free(otmp);
 182         return nid;
 183     }
 184 }
 185
 186 int EVP_CIPHER_block_size(const EVP_CIPHER *e)
 187 {
 188     return e->block_size;
 189 }
 190
 191 int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
 192 {
 193     return ctx->cipher->block_size;
 194 }
 195
 196 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 197                const unsigned char *in, unsigned int inl)
 198 {
 199     return ctx->cipher->do_cipher(ctx, out, in, inl);
 200 }
 201
 202 const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
 203 {
 204     return ctx->cipher;
 205 }
 206
 207 unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
 208 {
 209     return cipher->flags;
 210 }
 211
 212 unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
 213 {
 214     return ctx->cipher->flags;
 215 }
 216
 217 void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
 218 {
 219     return ctx->app_data;
 220 }
 221
 222 void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
 223 {
 224     ctx->app_data = data;
 225 }
 226
 227 int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
 228 {
 229     return cipher->iv_len;
 230 }
 231
 232 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
 233 {
 234     return ctx->cipher->iv_len;
 235 }
 236
 237 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
 238 {
 239     return cipher->key_len;
 240 }
 241
 242 int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
 243 {
 244     return ctx->key_len;
 245 }
 246
 247 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
 248 {
 249     return cipher->nid;
 250 }
 251
 252 int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
 253 {
 254     return ctx->cipher->nid;
 255 }
 256
 257 int EVP_MD_block_size(const EVP_MD *md)
 258 {
 259     return md->block_size;
 260 }
 261
 262 int EVP_MD_type(const EVP_MD *md)
 263 {
 264     return md->type;
 265 }
 266
 267 int EVP_MD_pkey_type(const EVP_MD *md)
 268 {
 269     return md->pkey_type;
 270 }
 271
 272 int EVP_MD_size(const EVP_MD *md)
 273 {
 274     if (!md) {
 275         EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
 276         return -1;
 277     }
 278     return md->md_size;
 279 }
 280
 281 unsigned long EVP_MD_flags(const EVP_MD *md)
 282 {
 283     return md->flags;
 284 }
 285
 286 const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
 287 {
 288     if (!ctx)
 289         return NULL;
 290     return ctx->digest;
 291 }
 292
 293 void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
 294 {
 295     ctx->flags |= flags;
 296 }
 297
 298 void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
 299 {
 300     ctx->flags &= ~flags;
 301 }
 302
 303 int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
 304 {
 305     return (ctx->flags & flags);
 306 }
 307
 308 void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
 309 {
 310     ctx->flags |= flags;
 311 }
 312
 313 void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
 314 {
 315     ctx->flags &= ~flags;
 316 }
 317
 318 int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
 319 {
 320     return (ctx->flags & flags);
 321 }