text: /* 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.]
   */
  
  #ifndef NO_RSA
  #include <stdio.h>
  #include "cryptlib.h"
  #include <openssl/rsa.h>
  #include <openssl/objects.h>
  #include <openssl/asn1_mac.h>
  #include <openssl/evp.h>
  #include <openssl/x509.h>
  
  
  #ifndef NO_RC4
  
  typedef struct netscape_pkey_st
  	{
  	ASN1_INTEGER *version;
  	X509_ALGOR *algor;
  	ASN1_OCTET_STRING *private_key;
  	} NETSCAPE_PKEY;
  
  static int i2d_NETSCAPE_PKEY(NETSCAPE_PKEY *a, unsigned char **pp);
  static NETSCAPE_PKEY *d2i_NETSCAPE_PKEY(NETSCAPE_PKEY **a,unsigned char **pp, long length);
  static NETSCAPE_PKEY *NETSCAPE_PKEY_new(void);
  static void NETSCAPE_PKEY_free(NETSCAPE_PKEY *);
  
  int i2d_Netscape_RSA(RSA *a, unsigned char **pp, int (*cb)())
  	{
  	int i,j,l[6];
  	NETSCAPE_PKEY *pkey;
  	unsigned char buf[256],*zz;
  	unsigned char key[EVP_MAX_KEY_LENGTH];
  	EVP_CIPHER_CTX ctx;
  	X509_ALGOR *alg=NULL;
  	ASN1_OCTET_STRING os,os2;
  	M_ASN1_I2D_vars(a);
  
  	if (a == NULL) return(0);
  
  #ifdef WIN32
  	r=r; /* shut the damn compiler up :-) */
  #endif
  
  	os.data=os2.data=NULL;
  	if ((pkey=NETSCAPE_PKEY_new()) == NULL) goto err;
  	if (!ASN1_INTEGER_set(pkey->version,0)) goto err;
  
  	if (pkey->algor->algorithm != NULL)
  		ASN1_OBJECT_free(pkey->algor->algorithm);
  	pkey->algor->algorithm=OBJ_nid2obj(NID_rsaEncryption);
  	if ((pkey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
  	pkey->algor->parameter->type=V_ASN1_NULL;
  
  	l[0]=i2d_RSAPrivateKey(a,NULL);
  	pkey->private_key->length=l[0];
  
  	os2.length=i2d_NETSCAPE_PKEY(pkey,NULL);
  	l[1]=i2d_ASN1_OCTET_STRING(&os2,NULL);
  
  	if ((alg=X509_ALGOR_new()) == NULL) goto err;
  	if (alg->algorithm != NULL)
  		ASN1_OBJECT_free(alg->algorithm);
  	alg->algorithm=OBJ_nid2obj(NID_rc4);
  	if ((alg->parameter=ASN1_TYPE_new()) == NULL) goto err;
  	alg->parameter->type=V_ASN1_NULL;
  
  	l[2]=i2d_X509_ALGOR(alg,NULL);
  	l[3]=ASN1_object_size(1,l[2]+l[1],V_ASN1_SEQUENCE);
  
  #ifndef CONST_STRICT
  	os.data=(unsigned char *)"private-key";
  #endif
  	os.length=11;
  	l[4]=i2d_ASN1_OCTET_STRING(&os,NULL);
  
  	l[5]=ASN1_object_size(1,l[4]+l[3],V_ASN1_SEQUENCE);
  
  	if (pp == NULL)
  		{
  		if (pkey != NULL) NETSCAPE_PKEY_free(pkey);
  		if (alg != NULL) X509_ALGOR_free(alg);
  		return(l[5]);
  		}
  
  	if (pkey->private_key->data != NULL)
  		Free((char *)pkey->private_key->data);
  	if ((pkey->private_key->data=(unsigned char *)Malloc(l[0])) == NULL)
  		{
  		ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ERR_R_MALLOC_FAILURE);
  		goto err;
  		}
  	zz=pkey->private_key->data;
  	i2d_RSAPrivateKey(a,&zz);
  
  	if ((os2.data=(unsigned char *)Malloc(os2.length)) == NULL)
  		{
  		ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ERR_R_MALLOC_FAILURE);
  		goto err;
  		}
  	zz=os2.data;
  	i2d_NETSCAPE_PKEY(pkey,&zz);
  		
  	if (cb == NULL)
  		cb=EVP_read_pw_string;
  	i=cb(buf,256,"Enter Private Key password:",1);
  	if (i != 0)
  		{
  		ASN1err(ASN1_F_I2D_NETSCAPE_RSA,ASN1_R_BAD_PASSWORD_READ);
  		goto err;
  		}
  	EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,
  		strlen((char *)buf),1,key,NULL);
  	memset(buf,0,256);
  
  	EVP_CIPHER_CTX_init(&ctx);
  	EVP_EncryptInit(&ctx,EVP_rc4(),key,NULL);
  	EVP_EncryptUpdate(&ctx,os2.data,&i,os2.data,os2.length);
  	EVP_EncryptFinal(&ctx,&(os2.data[i]),&j);
  	EVP_CIPHER_CTX_cleanup(&ctx);
  
  	p= *pp;
  	ASN1_put_object(&p,1,l[4]+l[3],V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL);
  	i2d_ASN1_OCTET_STRING(&os,&p);
  	ASN1_put_object(&p,1,l[2]+l[1],V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL);
  	i2d_X509_ALGOR(alg,&p);
  	i2d_ASN1_OCTET_STRING(&os2,&p);
  	ret=l[5];
  err:
  	if (os2.data != NULL) Free(os2.data);
  	if (alg != NULL) X509_ALGOR_free(alg);
  	if (pkey != NULL) NETSCAPE_PKEY_free(pkey);
  	r=r;
  	return(ret);
  	}
  
  RSA *d2i_Netscape_RSA(RSA **a, unsigned char **pp, long length, int (*cb)())
  	{
  	RSA *ret=NULL;
  	ASN1_OCTET_STRING *os=NULL;
  	ASN1_CTX c;
  
  	c.pp=pp;
  	c.error=ASN1_R_DECODING_ERROR;
  
  	M_ASN1_D2I_Init();
  	M_ASN1_D2I_start_sequence();
  	M_ASN1_D2I_get(os,d2i_ASN1_OCTET_STRING);
  	if ((os->length != 11) || (strncmp("private-key",
  		(char *)os->data,os->length) != 0))
  		{
  		ASN1err(ASN1_F_D2I_NETSCAPE_RSA,ASN1_R_PRIVATE_KEY_HEADER_MISSING);
  		ASN1_BIT_STRING_free(os);
  		goto err;
  		}
  	ASN1_BIT_STRING_free(os);
  	c.q=c.p;
  	if ((ret=d2i_Netscape_RSA_2(a,&c.p,c.slen,cb)) == NULL) goto err;
  	c.slen-=(c.p-c.q);
  
  	M_ASN1_D2I_Finish(a,RSA_free,ASN1_F_D2I_NETSCAPE_RSA);
  	}
  
  RSA *d2i_Netscape_RSA_2(RSA **a, unsigned char **pp, long length,
  	     int (*cb)())
  	{
  	NETSCAPE_PKEY *pkey=NULL;
  	RSA *ret=NULL;
  	int i,j;
  	unsigned char buf[256],*zz;
  	unsigned char key[EVP_MAX_KEY_LENGTH];
  	EVP_CIPHER_CTX ctx;
  	X509_ALGOR *alg=NULL;
  	ASN1_OCTET_STRING *os=NULL;
  	ASN1_CTX c;
  
  	c.error=ERR_R_NESTED_ASN1_ERROR;
  	c.pp=pp;
  
  	M_ASN1_D2I_Init();
  	M_ASN1_D2I_start_sequence();
  	M_ASN1_D2I_get(alg,d2i_X509_ALGOR);
  	if (OBJ_obj2nid(alg->algorithm) != NID_rc4)
  		{
  		ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_UNSUPPORTED_ENCRYPTION_ALGORITHM);
  		goto err;
  		}
  	M_ASN1_D2I_get(os,d2i_ASN1_OCTET_STRING);
  	if (cb == NULL)
  		cb=EVP_read_pw_string;
  	i=cb(buf,256,"Enter Private Key password:",0);
  	if (i != 0)
  		{
  		ASN1err(ASN1_F_D2I_NETSCAPE_RSA_2,ASN1_R_BAD_PASSWORD_READ);
  		goto err;
  		}
  
  	EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,
  		strlen((char *)buf),1,key,NULL);
  	memset(buf,0,256);
  
  	EVP_CIPHER_CTX_init(&ctx);
  	EVP_DecryptInit(&ctx,EVP_rc4(),key,NULL);
  	EVP_DecryptUpdate(&ctx,os->data,&i,os->data,os->length);
  	EVP_DecryptFinal(&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_NETSCAPE_RSA_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_NETSCAPE_RSA_2,ASN1_R_UNABLE_TO_DECODE_RSA_KEY);
  		goto err;
  		}
  	if (!asn1_Finish(&c)) goto err;
  	*pp=c.p;
  err:
  	if (pkey != NULL) NETSCAPE_PKEY_free(pkey);
  	if (os != NULL) ASN1_BIT_STRING_free(os);
  	if (alg != NULL) X509_ALGOR_free(alg);
  	return(ret);
  	}
  
  static int i2d_NETSCAPE_PKEY(NETSCAPE_PKEY *a, unsigned char **pp)
  	{
  	M_ASN1_I2D_vars(a);
  
  
  	M_ASN1_I2D_len(a->version,	i2d_ASN1_INTEGER);
  	M_ASN1_I2D_len(a->algor,	i2d_X509_ALGOR);
  	M_ASN1_I2D_len(a->private_key,	i2d_ASN1_OCTET_STRING);
  
  	M_ASN1_I2D_seq_total();
  
  	M_ASN1_I2D_put(a->version,	i2d_ASN1_INTEGER);
  	M_ASN1_I2D_put(a->algor,	i2d_X509_ALGOR);
  	M_ASN1_I2D_put(a->private_key,	i2d_ASN1_OCTET_STRING);
  
  	M_ASN1_I2D_finish();
  	}
  
  static NETSCAPE_PKEY *d2i_NETSCAPE_PKEY(NETSCAPE_PKEY **a, unsigned char **pp,
  	     long length)
  	{
  	M_ASN1_D2I_vars(a,NETSCAPE_PKEY *,NETSCAPE_PKEY_new);
  
  	M_ASN1_D2I_Init();
  	M_ASN1_D2I_start_sequence();
  	M_ASN1_D2I_get(ret->version,d2i_ASN1_INTEGER);
  	M_ASN1_D2I_get(ret->algor,d2i_X509_ALGOR);
  	M_ASN1_D2I_get(ret->private_key,d2i_ASN1_OCTET_STRING);
  	M_ASN1_D2I_Finish(a,NETSCAPE_PKEY_free,ASN1_F_D2I_NETSCAPE_PKEY);
  	}
  
  static NETSCAPE_PKEY *NETSCAPE_PKEY_new(void)
  	{
  	NETSCAPE_PKEY *ret=NULL;
  	ASN1_CTX c;
  
  	M_ASN1_New_Malloc(ret,NETSCAPE_PKEY);
  	M_ASN1_New(ret->version,ASN1_INTEGER_new);
  	M_ASN1_New(ret->algor,X509_ALGOR_new);
  	M_ASN1_New(ret->private_key,ASN1_OCTET_STRING_new);
  	return(ret);
  	M_ASN1_New_Error(ASN1_F_NETSCAPE_PKEY_NEW);
  	}
  
  static void NETSCAPE_PKEY_free(NETSCAPE_PKEY *a)
  	{
  	if (a == NULL) return;
  	ASN1_INTEGER_free(a->version);
  	X509_ALGOR_free(a->algor);
  	ASN1_OCTET_STRING_free(a->private_key);
  	Free((char *)a);
  	}
  
  #endif /* NO_RC4 */
  #endif
  