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 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 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 IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
  96
  97 ASN1_SEQUENCE(NETSCAPE_PKEY) = {
  98         ASN1_SIMPLE(NETSCAPE_PKEY, version, LONG),
  99         ASN1_SIMPLE(NETSCAPE_PKEY, algor, X509_ALGOR),
 100         ASN1_SIMPLE(NETSCAPE_PKEY, private_key, ASN1_OCTET_STRING)
 101 } ASN1_SEQUENCE_END(NETSCAPE_PKEY);
 102
 103 IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
 104
 105 static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
 106              int (*cb)(), int sgckey);
 107
 108 int i2d_Netscape_RSA(const RSA *a, unsigned char **pp, int (*cb)())
 109 {
 110         return i2d_RSA_NET(a, pp, cb, 0);
 111 }
 112
 113 int i2d_RSA_NET(const RSA *a, unsigned char **pp, int (*cb)(), int sgckey)
 114         {
 115         int i, j, ret = 0;
 116         int rsalen, pkeylen, olen;
 117         NETSCAPE_PKEY *pkey = NULL;
 118         NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
 119         unsigned char buf[256],*zz;
 120         unsigned char key[EVP_MAX_KEY_LENGTH];
 121         EVP_CIPHER_CTX ctx;
 122
 123         if (a == NULL) return(0);
 124
 125         if ((pkey=NETSCAPE_PKEY_new()) == NULL) goto err;
 126         if ((enckey=NETSCAPE_ENCRYPTED_PKEY_new()) == NULL) goto err;
 127         pkey->version = 0;
 128
 129         pkey->algor->algorithm=OBJ_nid2obj(NID_rsaEncryption);
 130         if ((pkey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
 131         pkey->algor->parameter->type=V_ASN1_NULL;
 132
 133         rsalen = i2d_RSAPrivateKey(a, NULL);
 134
 135         /* Fake some octet strings just for the initial length
 136          * calculation.
 137          */
 138
 139         pkey->private_key->length=rsalen;
 140
 141         pkeylen=i2d_NETSCAPE_PKEY(pkey,NULL);
 142
 143         enckey->enckey->digest->length = pkeylen;
 144
 145         enckey->os->length = 11;        /* "private-key" */
 146
 147         enckey->enckey->algor->algorithm=OBJ_nid2obj(NID_rc4);
 148         if ((enckey->enckey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
 149         enckey->enckey->algor->parameter->type=V_ASN1_NULL;
 150
 151         if (pp == NULL)
 152                 {
 153                 olen = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, NULL);
 154                 NETSCAPE_PKEY_free(pkey);
 155                 NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 156                 return olen;
 157                 }
 158
 159
 160         /* Since its RC4 encrypted length is actual length */
 161         if ((zz=(unsigned char *)OPENSSL_malloc(rsalen)) == NULL)
 162                 {
 163                 ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ERR_R_MALLOC_FAILURE);
 164                 goto err;
 165                 }
 166
 167         pkey->private_key->data = zz;
 168         /* Write out private key encoding */
 169         i2d_RSAPrivateKey(a,&zz);
 170
 171         if ((zz=OPENSSL_malloc(pkeylen)) == NULL)
 172                 {
 173                 ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ERR_R_MALLOC_FAILURE);
 174                 goto err;
 175                 }
 176
 177         if (!ASN1_STRING_set(enckey->os, "private-key", -1))
 178                 {
 179                 ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ERR_R_MALLOC_FAILURE);
 180                 goto err;
 181                 }
 182         enckey->enckey->digest->data = zz;
 183         i2d_NETSCAPE_PKEY(pkey,&zz);
 184
 185         /* Wipe the private key encoding */
 186         memset(pkey->private_key->data, 0, rsalen);
 187
 188         if (cb == NULL)
 189                 cb=EVP_read_pw_string;
 190         i=cb(buf,256,"Enter Private Key password:",1);
 191         if (i != 0)
 192                 {
 193                 ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ASN1_R_BAD_PASSWORD_READ);
 194                 goto err;
 195                 }
 196         i = strlen((char *)buf);
 197         /* If the key is used for SGC the algorithm is modified a little. */
 198         if(sgckey) {
 199                 EVP_MD_CTX mctx;
 200                 EVP_DigestInit(&mctx, EVP_md5());
 201                 EVP_DigestUpdate(&mctx, buf, i);
 202                 EVP_DigestFinal(&mctx, buf, NULL);
 203                 memcpy(buf + 16, "SGCKEYSALT", 10);
 204                 i = 26;
 205         }
 206
 207         EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL);
 208         memset(buf,0,256);
 209
 210         /* Encrypt private key in place */
 211         zz = enckey->enckey->digest->data;
 212         EVP_CIPHER_CTX_init(&ctx);
 213         EVP_EncryptInit(&ctx,EVP_rc4(),key,NULL);
 214         EVP_EncryptUpdate(&ctx,zz,&i,zz,pkeylen);
 215         EVP_EncryptFinal(&ctx,zz + i,&j);
 216         EVP_CIPHER_CTX_cleanup(&ctx);
 217
 218         ret = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, pp);
 219 err:
 220         NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 221         NETSCAPE_PKEY_free(pkey);
 222         return(ret);
 223         }
 224
 225
 226 RSA *d2i_Netscape_RSA(RSA **a, const unsigned char **pp, long length, int (*cb)())
 227 {
 228         return d2i_RSA_NET(a, pp, length, cb, 0);
 229 }
 230
 231 RSA *d2i_RSA_NET(RSA **a, const unsigned char **pp, long length, int (*cb)(), int sgckey)
 232         {
 233         RSA *ret=NULL;
 234         const unsigned char *p, *kp;
 235         NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
 236
 237         p = *pp;
 238
 239         enckey = d2i_NETSCAPE_ENCRYPTED_PKEY(NULL, &p, length);
 240         if(!enckey) {
 241                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA,ASN1_R_DECODING_ERROR);
 242                 return NULL;
 243         }
 244
 245         if ((enckey->os->length != 11) || (strncmp("private-key",
 246                 (char *)enckey->os->data,11) != 0))
 247                 {
 248                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA,ASN1_R_PRIVATE_KEY_HEADER_MISSING);
 249                 NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 250                 return NULL;
 251                 }
 252         if (OBJ_obj2nid(enckey->enckey->algor->algorithm) != NID_rc4)
 253                 {
 254                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_UNSUPPORTED_ENCRYPTION_ALGORITHM);
 255                 goto err;
 256         }
 257         kp = enckey->enckey->digest->data;
 258         if (cb == NULL)
 259                 cb=EVP_read_pw_string;
 260         if ((ret=d2i_RSA_NET_2(a, enckey->enckey->digest,cb, sgckey)) == NULL) goto err;
 261
 262         *pp = p;
 263
 264         err:
 265         NETSCAPE_ENCRYPTED_PKEY_free(enckey);
 266         return ret;
 267
 268         }
 269
 270 static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
 271              int (*cb)(), int sgckey)
 272         {
 273         NETSCAPE_PKEY *pkey=NULL;
 274         RSA *ret=NULL;
 275         int i,j;
 276         unsigned char buf[256];
 277         const unsigned char *zz;
 278         unsigned char key[EVP_MAX_KEY_LENGTH];
 279         EVP_CIPHER_CTX ctx;
 280
 281         i=cb(buf,256,"Enter Private Key password:",0);
 282         if (i != 0)
 283                 {
 284                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_BAD_PASSWORD_READ);
 285                 goto err;
 286                 }
 287
 288         i = strlen((char *)buf);
 289         if(sgckey){
 290                 EVP_MD_CTX mctx;
 291                 EVP_DigestInit(&mctx, EVP_md5());
 292                 EVP_DigestUpdate(&mctx, buf, i);
 293                 EVP_DigestFinal(&mctx, buf, NULL);
 294                 memcpy(buf + 16, "SGCKEYSALT", 10);
 295                 i = 26;
 296         }
 297
 298         EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL);
 299         memset(buf,0,256);
 300
 301         EVP_CIPHER_CTX_init(&ctx);
 302         EVP_DecryptInit(&ctx,EVP_rc4(),key,NULL);
 303         EVP_DecryptUpdate(&ctx,os->data,&i,os->data,os->length);
 304         EVP_DecryptFinal(&ctx,&(os->data[i]),&j);
 305         EVP_CIPHER_CTX_cleanup(&ctx);
 306         os->length=i+j;
 307
 308         zz=os->data;
 309
 310         if ((pkey=d2i_NETSCAPE_PKEY(NULL,&zz,os->length)) == NULL)
 311                 {
 312                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_UNABLE_TO_DECODE_RSA_PRIVATE_KEY);
 313                 goto err;
 314                 }
 315
 316         zz=pkey->private_key->data;
 317         if ((ret=d2i_RSAPrivateKey(a,&zz,pkey->private_key->length)) == NULL)
 318                 {
 319                 ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_UNABLE_TO_DECODE_RSA_KEY);
 320                 goto err;
 321                 }
 322 err:
 323         NETSCAPE_PKEY_free(pkey);
 324         return(ret);
 325         }
 326
 327 #endif /* NO_RC4 */
 328
 329 #else /* !NO_RSA */
 330
 331 # if PEDANTIC
 332 static void *dummy=&dummy;
 333 # endif
 334
 335 #endif