crypto/asn1/n_pkey.c

   1 /* crypto/asn1/n_pkey.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 "cryptlib.h"
  61 #ifndef OPENSSL_NO_RSA
  62 #include <openssl/rsa.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/asn1t.h>
  65 #include <openssl/asn1_mac.h>
  66 #include <openssl/evp.h>
  67 #include <openssl/x509.h>
  68
  69
  70 #ifndef OPENSSL_NO_RC4
  71
  72 typedef struct netscape_pkey_st
  73         {
  74         long version;
  75         X509_ALGOR *algor;
  76         ASN1_OCTET_STRING *private_key;
  77         } NETSCAPE_PKEY;
  78
  79 typedef struct netscape_encrypted_pkey_st
  80         {
  81         ASN1_OCTET_STRING *os;
  82         /* This is the same structure as DigestInfo so use it:
  83          * although this isn't really anything to do with
  84          * digests.
  85          */
  86         X509_SIG *enckey;
  87         } NETSCAPE_ENCRYPTED_PKEY;
  88
  89
  90 ASN1_BROKEN_SEQUENCE(NETSCAPE_ENCRYPTED_PKEY) = {
  91         ASN1_SIMPLE(NETSCAPE_ENCRYPTED_PKEY, os, ASN1_OCTET_STRING),
  92         ASN1_SIMPLE(NETSCAPE_ENCRYPTED_PKEY, enckey, X509_SIG)
  93 } ASN1_BROKEN_SEQUENCE_END(NETSCAPE_ENCRYPTED_PKEY)
  94
  95 DECLARE_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
  96 DECLARE_ASN1_ENCODE_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY,NETSCAPE_ENCRYPTED_PKEY)
  97 IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
  98
  99 ASN1_SEQUENCE(NETSCAPE_PKEY) = {
 100         ASN1_SIMPLE(NETSCAPE_PKEY, version, LONG),
 101         ASN1_SIMPLE(NETSCAPE_PKEY, algor, X509_ALGOR),
 102         ASN1_SIMPLE(NETSCAPE_PKEY, private_key, ASN1_OCTET_STRING)
 103 } ASN1_SEQUENCE_END(NETSCAPE_PKEY)
 104
 105 DECLARE_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
 106 DECLARE_ASN1_ENCODE_FUNCTIONS_const(NETSCAPE_PKEY,NETSCAPE_PKEY)
 107 IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
 108
 109 static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
 110                           int (*cb)(char *buf, int len, const char *prompt,
 111                                     int verify),
 112                           int sgckey);
 113
 114 int i2d_Netscape_RSA(const RSA *a, unsigned char **pp,
 115                      int (*cb)(char *buf, int len, const char *prompt,
 116                                int verify))
 117 {
 118         return i2d_RSA_NET(a, pp, cb, 0);
 119 }
 120
 121 int i2d_RSA_NET(const RSA *a, unsigned char **pp,
 122                 int (*cb)(char *buf, int len, const char *prompt, int verify),
 123                 int sgckey)
 124         {
 125         int i, j, ret = 0;
 126         int rsalen, pkeylen, olen;
 127         NETSCAPE_PKEY *pkey = NULL;
 128         NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
 129         unsigned char buf[256],*zz;
 130         unsigned char key[EVP_MAX_KEY_LENGTH];
 131         EVP_CIPHER_CTX ctx;
 132         EVP_CIPHER_CTX_init(&ctx);
 133
 134         if (a == NULL) return(0);
 135
 136         if ((pkey=NETSCAPE_PKEY_new()) == NULL) goto err;
 137         if ((enckey=NETSCAPE_ENCRYPTED_PKEY_new()) == NULL) goto err;
 138         pkey->version = 0;
 139
 140         pkey->algor->algorithm=OBJ_nid2obj(NID_rsaEncryption);
 141         if ((pkey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
 142         pkey->algor->parameter->type=V_ASN1_NULL;
 143
 144         rsalen = i2d_RSAPrivateKey(a, NULL);
 145
 146         /* Fake some octet strings just for the initial length
 147          * calculation.
 148          */
 149
 150         pkey->private_key->length=rsalen;
 151
 152         pkeylen=i2d_NETSCAPE_PKEY(pkey,NULL);
 153
 154         enckey->enckey->digest->length = pkeylen;
 155
 156         enckey->os->length = 11;        /* "private-key" */
 157
 158         enckey->enckey->algor->algorithm=OBJ_nid2obj(NID_rc4);
 159         if ((enckey->enckey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
 160         enckey->enckey->algor->parameter->type=V_ASN1_NULL;
 161
 162         if (pp == NULL)
 163                 {
 164                 olen = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, NULL);
 165                 NETSCAPE_PKEY_free(pkey);
 166                 NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 167                 return olen;
 168                 }
 169
 170
 171         /* Since its RC4 encrypted length is actual length */
 172         if ((zz=(unsigned char *)OPENSSL_malloc(rsalen)) == NULL)
 173                 {
 174                 ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
 175                 goto err;
 176                 }
 177
 178         pkey->private_key->data = zz;
 179         /* Write out private key encoding */
 180         i2d_RSAPrivateKey(a,&zz);
 181
 182         if ((zz=OPENSSL_malloc(pkeylen)) == NULL)
 183                 {
 184                 ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
 185                 goto err;
 186                 }
 187
 188         if (!ASN1_STRING_set(enckey->os, "private-key", -1))
 189                 {
 190                 ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
 191                 goto err;
 192                 }
 193         enckey->enckey->digest->data = zz;
 194         i2d_NETSCAPE_PKEY(pkey,&zz);
 195
 196         /* Wipe the private key encoding */
 197         OPENSSL_cleanse(pkey->private_key->data, rsalen);
 198
 199         if (cb == NULL)
 200                 cb=EVP_read_pw_string;
 201         i=cb((char *)buf,256,"Enter Private Key password:",1);
 202         if (i != 0)
 203                 {
 204                 ASN1err(ASN1_F_I2D_RSA_NET,ASN1_R_BAD_PASSWORD_READ);
 205                 goto err;
 206                 }
 207         i = strlen((char *)buf);
 208         /* If the key is used for SGC the algorithm is modified a little. */
 209         if(sgckey) {
 210                 if (!EVP_Digest(buf, i, buf, NULL, EVP_md5(), NULL))
 211                         goto err;
 212                 memcpy(buf + 16, "SGCKEYSALT", 10);
 213                 i = 26;
 214         }
 215
 216         if (!EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL))
 217                 goto err;
 218         OPENSSL_cleanse(buf,256);
 219
 220         /* Encrypt private key in place */
 221         zz = enckey->enckey->digest->data;
 222         if (!EVP_EncryptInit_ex(&ctx,EVP_rc4(),NULL,key,NULL))
 223                 goto err;
 224         if (!EVP_EncryptUpdate(&ctx,zz,&i,zz,pkeylen))
 225                 goto err;
 226         if (!EVP_EncryptFinal_ex(&ctx,zz + i,&j))
 227                 goto err;
 228
 229         ret = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, pp);
 230 err:
 231         EVP_CIPHER_CTX_cleanup(&ctx);
 232         NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 233         NETSCAPE_PKEY_free(pkey);
 234         return(ret);
 235         }
 236
 237
 238 RSA *d2i_Netscape_RSA(RSA **a, const unsigned char **pp, long length,
 239                       int (*cb)(char *buf, int len, const char *prompt,
 240                                 int verify))
 241 {
 242         return d2i_RSA_NET(a, pp, length, cb, 0);
 243 }
 244
 245 RSA *d2i_RSA_NET(RSA **a, const unsigned char **pp, long length,
 246                  int (*cb)(char *buf, int len, const char *prompt, int verify),
 247                  int sgckey)
 248         {
 249         RSA *ret=NULL;
 250         const unsigned char *p, *kp;
 251         NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
 252
 253         p = *pp;
 254
 255         enckey = d2i_NETSCAPE_ENCRYPTED_PKEY(NULL, &p, length);
 256         if(!enckey) {
 257                 ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_DECODING_ERROR);
 258                 return NULL;
 259         }
 260
 261         if ((enckey->os->length != 11) || (strncmp("private-key",
 262                 (char *)enckey->os->data,11) != 0))
 263                 {
 264                 ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_PRIVATE_KEY_HEADER_MISSING);
 265                 NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 266                 return NULL;
 267                 }
 268         if (OBJ_obj2nid(enckey->enckey->algor->algorithm) != NID_rc4)
 269                 {
 270                 ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_UNSUPPORTED_ENCRYPTION_ALGORITHM);
 271                 goto err;
 272         }
 273         kp = enckey->enckey->digest->data;
 274         if (cb == NULL)
 275                 cb=EVP_read_pw_string;
 276         if ((ret=d2i_RSA_NET_2(a, enckey->enckey->digest,cb, sgckey)) == NULL) goto err;
 277
 278         *pp = p;
 279
 280         err:
 281         NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 282         return ret;
 283
 284         }
 285
 286 static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
 287                           int (*cb)(char *buf, int len, const char *prompt,
 288                                     int verify), int sgckey)
 289         {
 290         NETSCAPE_PKEY *pkey=NULL;
 291         RSA *ret=NULL;
 292         int i,j;
 293         unsigned char buf[256];
 294         const unsigned char *zz;
 295         unsigned char key[EVP_MAX_KEY_LENGTH];
 296         EVP_CIPHER_CTX ctx;
 297         EVP_CIPHER_CTX_init(&ctx);
 298
 299         i=cb((char *)buf,256,"Enter Private Key password:",0);
 300         if (i != 0)
 301                 {
 302                 ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_BAD_PASSWORD_READ);
 303                 goto err;
 304                 }
 305
 306         i = strlen((char *)buf);
 307         if(sgckey){
 308                 if (!EVP_Digest(buf, i, buf, NULL, EVP_md5(), NULL))
 309                         goto err;
 310                 memcpy(buf + 16, "SGCKEYSALT", 10);
 311                 i = 26;
 312         }
 313
 314         if (!EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL))
 315                 goto err;
 316         OPENSSL_cleanse(buf,256);
 317
 318         if (!EVP_DecryptInit_ex(&ctx,EVP_rc4(),NULL, key,NULL))
 319                 goto err;
 320         if (!EVP_DecryptUpdate(&ctx,os->data,&i,os->data,os->length))
 321                 goto err;
 322         if (!EVP_DecryptFinal_ex(&ctx,&(os->data[i]),&j))
 323                 goto err;
 324         os->length=i+j;
 325
 326         zz=os->data;
 327
 328         if ((pkey=d2i_NETSCAPE_PKEY(NULL,&zz,os->length)) == NULL)
 329                 {
 330                 ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_UNABLE_TO_DECODE_RSA_PRIVATE_KEY);
 331                 goto err;
 332                 }
 333
 334         zz=pkey->private_key->data;
 335         if ((ret=d2i_RSAPrivateKey(a,&zz,pkey->private_key->length)) == NULL)
 336                 {
 337                 ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_UNABLE_TO_DECODE_RSA_KEY);
 338                 goto err;
 339                 }
 340 err:
 341         EVP_CIPHER_CTX_cleanup(&ctx);
 342         NETSCAPE_PKEY_free(pkey);
 343         return(ret);
 344         }
 345
 346 #endif /* OPENSSL_NO_RC4 */
 347
 348 #else /* !OPENSSL_NO_RSA */
 349
 350 # if PEDANTIC
 351 static void *dummy=&dummy;
 352 # endif
 353
 354 #endif