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 #ifndef OPENSSL_NO_RSA
  60 #include <stdio.h>
  61 #include "cryptlib.h"
  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 NETSCAPE_ENCRYPTED_PKEY *d2i_NETSCAPE_ENCRYPTED_PKEY(NETSCAPE_ENCRYPTED_PKEY **p, const unsigned char **in, long len);
  96 int i2d_NETSCAPE_ENCRYPTED_PKEY(const NETSCAPE_ENCRYPTED_PKEY *a, unsigned char **out);
  97 NETSCAPE_ENCRYPTED_PKEY *NETSCAPE_ENCRYPTED_PKEY_new(void);
  98 void NETSCAPE_ENCRYPTED_PKEY_free(NETSCAPE_ENCRYPTED_PKEY *a);
  99
 100 IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
 101
 102 ASN1_SEQUENCE(NETSCAPE_PKEY) = {
 103         ASN1_SIMPLE(NETSCAPE_PKEY, version, LONG),
 104         ASN1_SIMPLE(NETSCAPE_PKEY, algor, X509_ALGOR),
 105         ASN1_SIMPLE(NETSCAPE_PKEY, private_key, ASN1_OCTET_STRING)
 106 } ASN1_SEQUENCE_END(NETSCAPE_PKEY)
 107
 108 NETSCAPE_PKEY *d2i_NETSCAPE_PKEY(NETSCAPE_PKEY **p, const unsigned char **in, long len);
 109 int i2d_NETSCAPE_PKEY(const NETSCAPE_PKEY *a, unsigned char **out);
 110 NETSCAPE_PKEY *NETSCAPE_PKEY_new(void);
 111 void NETSCAPE_PKEY_free(NETSCAPE_PKEY *a);
 112 IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
 113
 114 static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
 115              int (*cb)(), int sgckey);
 116
 117 int i2d_Netscape_RSA(const RSA *a, unsigned char **pp, int (*cb)())
 118 {
 119         return i2d_RSA_NET(a, pp, cb, 0);
 120 }
 121
 122 int i2d_RSA_NET(const RSA *a, unsigned char **pp, int (*cb)(), int sgckey)
 123         {
 124         int i, j, ret = 0;
 125         int rsalen, pkeylen, olen;
 126         NETSCAPE_PKEY *pkey = NULL;
 127         NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
 128         unsigned char buf[256],*zz;
 129         unsigned char key[EVP_MAX_KEY_LENGTH];
 130         EVP_CIPHER_CTX ctx;
 131
 132         if (a == NULL) return(0);
 133
 134         if ((pkey=NETSCAPE_PKEY_new()) == NULL) goto err;
 135         if ((enckey=NETSCAPE_ENCRYPTED_PKEY_new()) == NULL) goto err;
 136         pkey->version = 0;
 137
 138         pkey->algor->algorithm=OBJ_nid2obj(NID_rsaEncryption);
 139         if ((pkey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
 140         pkey->algor->parameter->type=V_ASN1_NULL;
 141
 142         rsalen = i2d_RSAPrivateKey(a, NULL);
 143
 144         /* Fake some octet strings just for the initial length
 145          * calculation.
 146          */
 147
 148         pkey->private_key->length=rsalen;
 149
 150         pkeylen=i2d_NETSCAPE_PKEY(pkey,NULL);
 151
 152         enckey->enckey->digest->length = pkeylen;
 153
 154         enckey->os->length = 11;        /* "private-key" */
 155
 156         enckey->enckey->algor->algorithm=OBJ_nid2obj(NID_rc4);
 157         if ((enckey->enckey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
 158         enckey->enckey->algor->parameter->type=V_ASN1_NULL;
 159
 160         if (pp == NULL)
 161                 {
 162                 olen = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, NULL);
 163                 NETSCAPE_PKEY_free(pkey);
 164                 NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 165                 return olen;
 166                 }
 167
 168
 169         /* Since its RC4 encrypted length is actual length */
 170         if ((zz=(unsigned char *)OPENSSL_malloc(rsalen)) == NULL)
 171                 {
 172                 ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ERR_R_MALLOC_FAILURE);
 173                 goto err;
 174                 }
 175
 176         pkey->private_key->data = zz;
 177         /* Write out private key encoding */
 178         i2d_RSAPrivateKey(a,&zz);
 179
 180         if ((zz=OPENSSL_malloc(pkeylen)) == NULL)
 181                 {
 182                 ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ERR_R_MALLOC_FAILURE);
 183                 goto err;
 184                 }
 185
 186         if (!ASN1_STRING_set(enckey->os, "private-key", -1))
 187                 {
 188                 ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ERR_R_MALLOC_FAILURE);
 189                 goto err;
 190                 }
 191         enckey->enckey->digest->data = zz;
 192         i2d_NETSCAPE_PKEY(pkey,&zz);
 193
 194         /* Wipe the private key encoding */
 195         memset(pkey->private_key->data, 0, rsalen);
 196
 197         if (cb == NULL)
 198                 cb=EVP_read_pw_string;
 199         i=cb(buf,256,"Enter Private Key password:",1);
 200         if (i != 0)
 201                 {
 202                 ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ASN1_R_BAD_PASSWORD_READ);
 203                 goto err;
 204                 }
 205         i = strlen((char *)buf);
 206         /* If the key is used for SGC the algorithm is modified a little. */
 207         if(sgckey) {
 208                 EVP_Digest(buf, i, buf, NULL, EVP_md5(), NULL);
 209                 memcpy(buf + 16, "SGCKEYSALT", 10);
 210                 i = 26;
 211         }
 212
 213         EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL);
 214         memset(buf,0,256);
 215
 216         /* Encrypt private key in place */
 217         zz = enckey->enckey->digest->data;
 218         EVP_CIPHER_CTX_init(&ctx);
 219         EVP_EncryptInit_ex(&ctx,EVP_rc4(),NULL,key,NULL);
 220         EVP_EncryptUpdate(&ctx,zz,&i,zz,pkeylen);
 221         EVP_EncryptFinal_ex(&ctx,zz + i,&j);
 222         EVP_CIPHER_CTX_cleanup(&ctx);
 223
 224         ret = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, pp);
 225 err:
 226         NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 227         NETSCAPE_PKEY_free(pkey);
 228         return(ret);
 229         }
 230
 231
 232 RSA *d2i_Netscape_RSA(RSA **a, const unsigned char **pp, long length, int (*cb)())
 233 {
 234         return d2i_RSA_NET(a, pp, length, cb, 0);
 235 }
 236
 237 RSA *d2i_RSA_NET(RSA **a, const unsigned char **pp, long length, int (*cb)(), int sgckey)
 238         {
 239         RSA *ret=NULL;
 240         const unsigned char *p, *kp;
 241         NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
 242
 243         p = *pp;
 244
 245         enckey = d2i_NETSCAPE_ENCRYPTED_PKEY(NULL, &p, length);
 246         if(!enckey) {
 247                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA,ASN1_R_DECODING_ERROR);
 248                 return NULL;
 249         }
 250
 251         if ((enckey->os->length != 11) || (strncmp("private-key",
 252                 (char *)enckey->os->data,11) != 0))
 253                 {
 254                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA,ASN1_R_PRIVATE_KEY_HEADER_MISSING);
 255                 NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 256                 return NULL;
 257                 }
 258         if (OBJ_obj2nid(enckey->enckey->algor->algorithm) != NID_rc4)
 259                 {
 260                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_UNSUPPORTED_ENCRYPTION_ALGORITHM);
 261                 goto err;
 262         }
 263         kp = enckey->enckey->digest->data;
 264         if (cb == NULL)
 265                 cb=EVP_read_pw_string;
 266         if ((ret=d2i_RSA_NET_2(a, enckey->enckey->digest,cb, sgckey)) == NULL) goto err;
 267
 268         *pp = p;
 269
 270         err:
 271         NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 272         return ret;
 273
 274         }
 275
 276 static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
 277              int (*cb)(), int sgckey)
 278         {
 279         NETSCAPE_PKEY *pkey=NULL;
 280         RSA *ret=NULL;
 281         int i,j;
 282         unsigned char buf[256];
 283         const unsigned char *zz;
 284         unsigned char key[EVP_MAX_KEY_LENGTH];
 285         EVP_CIPHER_CTX ctx;
 286
 287         i=cb(buf,256,"Enter Private Key password:",0);
 288         if (i != 0)
 289                 {
 290                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_BAD_PASSWORD_READ);
 291                 goto err;
 292                 }
 293
 294         i = strlen((char *)buf);
 295         if(sgckey){
 296                 EVP_Digest(buf, i, buf, NULL, EVP_md5(), NULL);
 297                 memcpy(buf + 16, "SGCKEYSALT", 10);
 298                 i = 26;
 299         }
 300
 301         EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL);
 302         memset(buf,0,256);
 303
 304         EVP_CIPHER_CTX_init(&ctx);
 305         EVP_DecryptInit_ex(&ctx,EVP_rc4(),NULL, key,NULL);
 306         EVP_DecryptUpdate(&ctx,os->data,&i,os->data,os->length);
 307         EVP_DecryptFinal_ex(&ctx,&(os->data[i]),&j);
 308         EVP_CIPHER_CTX_cleanup(&ctx);
 309         os->length=i+j;
 310
 311         zz=os->data;
 312
 313         if ((pkey=d2i_NETSCAPE_PKEY(NULL,&zz,os->length)) == NULL)
 314                 {
 315                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_UNABLE_TO_DECODE_RSA_PRIVATE_KEY);
 316                 goto err;
 317                 }
 318
 319         zz=pkey->private_key->data;
 320         if ((ret=d2i_RSAPrivateKey(a,&zz,pkey->private_key->length)) == NULL)
 321                 {
 322                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_UNABLE_TO_DECODE_RSA_KEY);
 323                 goto err;
 324                 }
 325 err:
 326         NETSCAPE_PKEY_free(pkey);
 327         return(ret);
 328         }
 329
 330 #endif /* OPENSSL_NO_RC4 */
 331
 332 #else /* !OPENSSL_NO_RSA */
 333
 334 # if PEDANTIC
 335 static void *dummy=&dummy;
 336 # endif
 337
 338 #endif