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      1 /* crypto/evp/evp_lib.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 "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
     71 		ret=-1;
     72 	return(ret);
     73 	}
     74 
     75 int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
     76 	{
     77 	int ret;
     78 
     79 	if (c->cipher->get_asn1_parameters != NULL)
     80 		ret=c->cipher->get_asn1_parameters(c,type);
     81 	else
     82 		ret=-1;
     83 	return(ret);
     84 	}
     85 
     86 int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
     87 	{
     88 	int i=0;
     89 	unsigned int l;
     90 
     91 	if (type != NULL)
     92 		{
     93 		l=EVP_CIPHER_CTX_iv_length(c);
     94 		OPENSSL_assert(l <= sizeof(c->iv));
     95 		i=ASN1_TYPE_get_octetstring(type,c->oiv,l);
     96 		if (i != (int)l)
     97 			return(-1);
     98 		else if (i > 0)
     99 			memcpy(c->iv,c->oiv,l);
    100 		}
    101 	return(i);
    102 	}
    103 
    104 int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
    105 	{
    106 	int i=0;
    107 	unsigned int j;
    108 
    109 	if (type != NULL)
    110 		{
    111 		j=EVP_CIPHER_CTX_iv_length(c);
    112 		OPENSSL_assert(j <= sizeof(c->iv));
    113 		i=ASN1_TYPE_set_octetstring(type,c->oiv,j);
    114 		}
    115 	return(i);
    116 	}
    117 
    118 /* Convert the various cipher NIDs and dummies to a proper OID NID */
    119 int EVP_CIPHER_type(const EVP_CIPHER *ctx)
    120 {
    121 	int nid;
    122 	ASN1_OBJECT *otmp;
    123 	nid = EVP_CIPHER_nid(ctx);
    124 
    125 	switch(nid) {
    126 
    127 		case NID_rc2_cbc:
    128 		case NID_rc2_64_cbc:
    129 		case NID_rc2_40_cbc:
    130 
    131 		return NID_rc2_cbc;
    132 
    133 		case NID_rc4:
    134 		case NID_rc4_40:
    135 
    136 		return NID_rc4;
    137 
    138 		case NID_aes_128_cfb128:
    139 		case NID_aes_128_cfb8:
    140 		case NID_aes_128_cfb1:
    141 
    142 		return NID_aes_128_cfb128;
    143 
    144 		case NID_aes_192_cfb128:
    145 		case NID_aes_192_cfb8:
    146 		case NID_aes_192_cfb1:
    147 
    148 		return NID_aes_192_cfb128;
    149 
    150 		case NID_aes_256_cfb128:
    151 		case NID_aes_256_cfb8:
    152 		case NID_aes_256_cfb1:
    153 
    154 		return NID_aes_256_cfb128;
    155 
    156 		case NID_des_cfb64:
    157 		case NID_des_cfb8:
    158 		case NID_des_cfb1:
    159 
    160 		return NID_des_cfb64;
    161 
    162 		case NID_des_ede3_cfb64:
    163 		case NID_des_ede3_cfb8:
    164 		case NID_des_ede3_cfb1:
    165 
    166 		return NID_des_cfb64;
    167 
    168 		default:
    169 		/* Check it has an OID and it is valid */
    170 		otmp = OBJ_nid2obj(nid);
    171 		if(!otmp || !otmp->data) nid = NID_undef;
    172 		ASN1_OBJECT_free(otmp);
    173 		return nid;
    174 	}
    175 }
    176 
    177 int EVP_CIPHER_block_size(const EVP_CIPHER *e)
    178 	{
    179 	return e->block_size;
    180 	}
    181 
    182 int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
    183 	{
    184 	return ctx->cipher->block_size;
    185 	}
    186 
    187 int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl)
    188 	{
    189 	return ctx->cipher->do_cipher(ctx,out,in,inl);
    190 	}
    191 
    192 const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
    193 	{
    194 	return ctx->cipher;
    195 	}
    196 
    197 unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
    198 	{
    199 	return cipher->flags;
    200 	}
    201 
    202 unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
    203 	{
    204 	return ctx->cipher->flags;
    205 	}
    206 
    207 void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
    208 	{
    209 	return ctx->app_data;
    210 	}
    211 
    212 void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
    213 	{
    214 	ctx->app_data = data;
    215 	}
    216 
    217 int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
    218 	{
    219 	return cipher->iv_len;
    220 	}
    221 
    222 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
    223 	{
    224 	return ctx->cipher->iv_len;
    225 	}
    226 
    227 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
    228 	{
    229 	return cipher->key_len;
    230 	}
    231 
    232 int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
    233 	{
    234 	return ctx->key_len;
    235 	}
    236 
    237 int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
    238 	{
    239 	return cipher->nid;
    240 	}
    241 
    242 int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
    243 	{
    244 	return ctx->cipher->nid;
    245 	}
    246 
    247 int EVP_MD_block_size(const EVP_MD *md)
    248 	{
    249 	return md->block_size;
    250 	}
    251 
    252 int EVP_MD_type(const EVP_MD *md)
    253 	{
    254 	return md->type;
    255 	}
    256 
    257 int EVP_MD_pkey_type(const EVP_MD *md)
    258 	{
    259 	return md->pkey_type;
    260 	}
    261 
    262 int EVP_MD_size(const EVP_MD *md)
    263 	{
    264 	if (!md)
    265 		{
    266 		EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);
    267 		return -1;
    268 		}
    269 	return md->md_size;
    270 	}
    271 
    272 unsigned long EVP_MD_flags(const EVP_MD *md)
    273 	{
    274 	return md->flags;
    275 	}
    276 
    277 const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
    278 	{
    279 	if (!ctx)
    280 		return NULL;
    281 	return ctx->digest;
    282 	}
    283 
    284 void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
    285 	{
    286 	ctx->flags |= flags;
    287 	}
    288 
    289 void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
    290 	{
    291 	ctx->flags &= ~flags;
    292 	}
    293 
    294 int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
    295 	{
    296 	return (ctx->flags & flags);
    297 	}
    298 
    299 void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
    300 	{
    301 	ctx->flags |= flags;
    302 	}
    303 
    304 void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
    305 	{
    306 	ctx->flags &= ~flags;
    307 	}
    308 
    309 int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
    310 	{
    311 	return (ctx->flags & flags);
    312 	}
    313