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n_pkey.c
/* crypto/asn1/n_pkey.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#include <openssl/objects.h>
#include <openssl/asn1t.h>
#include <openssl/asn1_mac.h>
#include <openssl/evp.h>
#include <openssl/x509.h>


#ifndef OPENSSL_NO_RC4

00072 typedef struct netscape_pkey_st
      {
      long version;
      X509_ALGOR *algor;
      ASN1_OCTET_STRING *private_key;
      } NETSCAPE_PKEY;

00079 typedef struct netscape_encrypted_pkey_st
      {
      ASN1_OCTET_STRING *os;
      /* This is the same structure as DigestInfo so use it:
       * although this isn't really anything to do with
       * digests.
       */
      X509_SIG *enckey;
      } NETSCAPE_ENCRYPTED_PKEY;


ASN1_BROKEN_SEQUENCE(NETSCAPE_ENCRYPTED_PKEY) = {
      ASN1_SIMPLE(NETSCAPE_ENCRYPTED_PKEY, os, ASN1_OCTET_STRING),
      ASN1_SIMPLE(NETSCAPE_ENCRYPTED_PKEY, enckey, X509_SIG)
} ASN1_BROKEN_SEQUENCE_END(NETSCAPE_ENCRYPTED_PKEY)

DECLARE_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY,NETSCAPE_ENCRYPTED_PKEY)
IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)

ASN1_SEQUENCE(NETSCAPE_PKEY) = {
      ASN1_SIMPLE(NETSCAPE_PKEY, version, LONG),
      ASN1_SIMPLE(NETSCAPE_PKEY, algor, X509_ALGOR),
      ASN1_SIMPLE(NETSCAPE_PKEY, private_key, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(NETSCAPE_PKEY)

DECLARE_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(NETSCAPE_PKEY,NETSCAPE_PKEY)
IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)

static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
                    int (*cb)(char *buf, int len, const char *prompt,
                            int verify),
                    int sgckey);

int i2d_Netscape_RSA(const RSA *a, unsigned char **pp,
                 int (*cb)(char *buf, int len, const char *prompt,
                         int verify))
{
      return i2d_RSA_NET(a, pp, cb, 0);
}

int i2d_RSA_NET(const RSA *a, unsigned char **pp,
            int (*cb)(char *buf, int len, const char *prompt, int verify),
            int sgckey)
      {
      int i, j, ret = 0;
      int rsalen, pkeylen, olen;
      NETSCAPE_PKEY *pkey = NULL;
      NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
      unsigned char buf[256],*zz;
      unsigned char key[EVP_MAX_KEY_LENGTH];
      EVP_CIPHER_CTX ctx;

      if (a == NULL) return(0);

      if ((pkey=NETSCAPE_PKEY_new()) == NULL) goto err;
      if ((enckey=NETSCAPE_ENCRYPTED_PKEY_new()) == NULL) goto err;
      pkey->version = 0;

      pkey->algor->algorithm=OBJ_nid2obj(NID_rsaEncryption);
      if ((pkey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
      pkey->algor->parameter->type=V_ASN1_NULL;

      rsalen = i2d_RSAPrivateKey(a, NULL);

      /* Fake some octet strings just for the initial length
       * calculation.
       */

      pkey->private_key->length=rsalen;

      pkeylen=i2d_NETSCAPE_PKEY(pkey,NULL);

      enckey->enckey->digest->length = pkeylen;

      enckey->os->length = 11;      /* "private-key" */

      enckey->enckey->algor->algorithm=OBJ_nid2obj(NID_rc4);
      if ((enckey->enckey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
      enckey->enckey->algor->parameter->type=V_ASN1_NULL;

      if (pp == NULL)
            {
            olen = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, NULL);
            NETSCAPE_PKEY_free(pkey);
            NETSCAPE_ENCRYPTED_PKEY_free(enckey);
            return olen;
            }


      /* Since its RC4 encrypted length is actual length */
      if ((zz=(unsigned char *)OPENSSL_malloc(rsalen)) == NULL)
            {
            ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
            goto err;
            }

      pkey->private_key->data = zz;
      /* Write out private key encoding */
      i2d_RSAPrivateKey(a,&zz);

      if ((zz=OPENSSL_malloc(pkeylen)) == NULL)
            {
            ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
            goto err;
            }

      if (!ASN1_STRING_set(enckey->os, "private-key", -1)) 
            {
            ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
            goto err;
            }
      enckey->enckey->digest->data = zz;
      i2d_NETSCAPE_PKEY(pkey,&zz);

      /* Wipe the private key encoding */
      OPENSSL_cleanse(pkey->private_key->data, rsalen);
            
      if (cb == NULL)
            cb=EVP_read_pw_string;
      i=cb((char *)buf,256,"Enter Private Key password:",1);
      if (i != 0)
            {
            ASN1err(ASN1_F_I2D_RSA_NET,ASN1_R_BAD_PASSWORD_READ);
            goto err;
            }
      i = strlen((char *)buf);
      /* If the key is used for SGC the algorithm is modified a little. */
      if(sgckey) {
            EVP_Digest(buf, i, buf, NULL, EVP_md5(), NULL);
            memcpy(buf + 16, "SGCKEYSALT", 10);
            i = 26;
      }

      EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL);
      OPENSSL_cleanse(buf,256);

      /* Encrypt private key in place */
      zz = enckey->enckey->digest->data;
      EVP_CIPHER_CTX_init(&ctx);
      EVP_EncryptInit_ex(&ctx,EVP_rc4(),NULL,key,NULL);
      EVP_EncryptUpdate(&ctx,zz,&i,zz,pkeylen);
      EVP_EncryptFinal_ex(&ctx,zz + i,&j);
      EVP_CIPHER_CTX_cleanup(&ctx);

      ret = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, pp);
err:
      NETSCAPE_ENCRYPTED_PKEY_free(enckey);
      NETSCAPE_PKEY_free(pkey);
      return(ret);
      }


RSA *d2i_Netscape_RSA(RSA **a, const unsigned char **pp, long length,
                  int (*cb)(char *buf, int len, const char *prompt,
                        int verify))
{
      return d2i_RSA_NET(a, pp, length, cb, 0);
}

RSA *d2i_RSA_NET(RSA **a, const unsigned char **pp, long length,
             int (*cb)(char *buf, int len, const char *prompt, int verify),
             int sgckey)
      {
      RSA *ret=NULL;
      const unsigned char *p;
      NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;

      p = *pp;

      enckey = d2i_NETSCAPE_ENCRYPTED_PKEY(NULL, &p, length);
      if(!enckey) {
            ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_DECODING_ERROR);
            return NULL;
      }

      if ((enckey->os->length != 11) || (strncmp("private-key",
            (char *)enckey->os->data,11) != 0))
            {
            ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_PRIVATE_KEY_HEADER_MISSING);
            NETSCAPE_ENCRYPTED_PKEY_free(enckey);
            return NULL;
            }
      if (OBJ_obj2nid(enckey->enckey->algor->algorithm) != NID_rc4)
            {
            ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_UNSUPPORTED_ENCRYPTION_ALGORITHM);
            goto err;
      }
      if (cb == NULL)
            cb=EVP_read_pw_string;
      if ((ret=d2i_RSA_NET_2(a, enckey->enckey->digest,cb, sgckey)) == NULL) goto err;

      *pp = p;

      err:
      NETSCAPE_ENCRYPTED_PKEY_free(enckey);
      return ret;

      }

static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
                    int (*cb)(char *buf, int len, const char *prompt,
                            int verify), int sgckey)
      {
      NETSCAPE_PKEY *pkey=NULL;
      RSA *ret=NULL;
      int i,j;
      unsigned char buf[256];
      const unsigned char *zz;
      unsigned char key[EVP_MAX_KEY_LENGTH];
      EVP_CIPHER_CTX ctx;

      i=cb((char *)buf,256,"Enter Private Key password:",0);
      if (i != 0)
            {
            ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_BAD_PASSWORD_READ);
            goto err;
            }

      i = strlen((char *)buf);
      if(sgckey){
            EVP_Digest(buf, i, buf, NULL, EVP_md5(), NULL);
            memcpy(buf + 16, "SGCKEYSALT", 10);
            i = 26;
      }
            
      EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL);
      OPENSSL_cleanse(buf,256);

      EVP_CIPHER_CTX_init(&ctx);
      EVP_DecryptInit_ex(&ctx,EVP_rc4(),NULL, key,NULL);
      EVP_DecryptUpdate(&ctx,os->data,&i,os->data,os->length);
      EVP_DecryptFinal_ex(&ctx,&(os->data[i]),&j);
      EVP_CIPHER_CTX_cleanup(&ctx);
      os->length=i+j;

      zz=os->data;

      if ((pkey=d2i_NETSCAPE_PKEY(NULL,&zz,os->length)) == NULL)
            {
            ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_UNABLE_TO_DECODE_RSA_PRIVATE_KEY);
            goto err;
            }
            
      zz=pkey->private_key->data;
      if ((ret=d2i_RSAPrivateKey(a,&zz,pkey->private_key->length)) == NULL)
            {
            ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_UNABLE_TO_DECODE_RSA_KEY);
            goto err;
            }
err:
      NETSCAPE_PKEY_free(pkey);
      return(ret);
      }

#endif /* OPENSSL_NO_RC4 */

#else /* !OPENSSL_NO_RSA */

# if PEDANTIC
static void *dummy=&dummy;
# endif

#endif

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