/* apps/dgst.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 <string.h>

#include <stdlib.h>

#include "apps.h"

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

#include <openssl/pem.h>

#undef BUFSIZE

#define BUFSIZE	1024*8

#undef PROG

#define PROG	dgst_main

int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout,

	  EVP_PKEY *key, unsigned char *sigin, int siglen, const char *title,

	  const char *file);

int MAIN(int, char **);

int MAIN(int argc, char **argv)

	{

	ENGINE *e = NULL;

	unsigned char *buf=NULL;

	int i,err=0;

	const EVP_MD *md=NULL,*m;

	BIO *in=NULL,*inp;

	BIO *bmd=NULL;

	BIO *out = NULL;

	const char *name;

#define PROG_NAME_SIZE  39

	char pname[PROG_NAME_SIZE+1];

	int separator=0;

	int debug=0;

	int keyform=FORMAT_PEM;

	const char *outfile = NULL, *keyfile = NULL;

	const char *sigfile = NULL, *randfile = NULL;

	int out_bin = -1, want_pub = 0, do_verify = 0;

	EVP_PKEY *sigkey = NULL;

	unsigned char *sigbuf = NULL;

	int siglen = 0;

	char *passargin = NULL, *passin = NULL;

#ifndef OPENSSL_NO_ENGINE

	char *engine=NULL;

#endif

	apps_startup();

	if ((buf=(unsigned char *)OPENSSL_malloc(BUFSIZE)) == NULL)

		{

		BIO_printf(bio_err,"out of memory\n");

		goto end;

		}

	if (bio_err == NULL)

		if ((bio_err=BIO_new(BIO_s_file())) != NULL)

			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

	if (!load_config(bio_err, NULL))

		goto end;

	/* first check the program name */

	program_name(argv[0],pname,sizeof pname);

	md=EVP_get_digestbyname(pname);

	argc--;

	argv++;

	while (argc > 0)

		{

		if ((*argv)[0] != '-') break;

		if (strcmp(*argv,"-c") == 0)

			separator=1;

		else if (strcmp(*argv,"-rand") == 0)

			{

			if (--argc < 1) break;

			randfile=*(++argv);

			}

		else if (strcmp(*argv,"-out") == 0)

			{

			if (--argc < 1) break;

			outfile=*(++argv);

			}

		else if (strcmp(*argv,"-sign") == 0)

			{

			if (--argc < 1) break;

			keyfile=*(++argv);

			}

		else if (!strcmp(*argv,"-passin"))

			{

			if (--argc < 1)

				break;

			passargin=*++argv;

			}

		else if (strcmp(*argv,"-verify") == 0)

			{

			if (--argc < 1) break;

			keyfile=*(++argv);

			want_pub = 1;

			do_verify = 1;

			}

		else if (strcmp(*argv,"-prverify") == 0)

			{

			if (--argc < 1) break;

			keyfile=*(++argv);

			do_verify = 1;

			}

		else if (strcmp(*argv,"-signature") == 0)

			{

			if (--argc < 1) break;

			sigfile=*(++argv);

			}

		else if (strcmp(*argv,"-keyform") == 0)

			{

			if (--argc < 1) break;

			keyform=str2fmt(*(++argv));

			}

#ifndef OPENSSL_NO_ENGINE

		else if (strcmp(*argv,"-engine") == 0)

			{

			if (--argc < 1) break;

			engine= *(++argv);

			}

#endif

		else if (strcmp(*argv,"-hex") == 0)

			out_bin = 0;

		else if (strcmp(*argv,"-binary") == 0)

			out_bin = 1;

		else if (strcmp(*argv,"-d") == 0)

			debug=1;

		else if ((m=EVP_get_digestbyname(&((*argv)[1]))) != NULL)

			md=m;

		else

			break;

		argc--;

		argv++;

		}

	if (md == NULL)

		md=EVP_md5();

	if(do_verify && !sigfile) {

		BIO_printf(bio_err, "No signature to verify: use the -signature option\n");

		err = 1; 

		goto end;

	}

	if ((argc > 0) && (argv[0][0] == '-')) /* bad option */

		{

		BIO_printf(bio_err,"unknown option '%s'\n",*argv);

		BIO_printf(bio_err,"options are\n");

		BIO_printf(bio_err,"-c              to output the digest with separating colons\n");

		BIO_printf(bio_err,"-d              to output debug info\n");

		BIO_printf(bio_err,"-hex            output as hex dump\n");

		BIO_printf(bio_err,"-binary         output in binary form\n");

		BIO_printf(bio_err,"-sign   file    sign digest using private key in file\n");

		BIO_printf(bio_err,"-verify file    verify a signature using public key in file\n");

		BIO_printf(bio_err,"-prverify file  verify a signature using private key in file\n");

		BIO_printf(bio_err,"-keyform arg    key file format (PEM or ENGINE)\n");

		BIO_printf(bio_err,"-signature file signature to verify\n");

		BIO_printf(bio_err,"-binary         output in binary form\n");

#ifndef OPENSSL_NO_ENGINE

		BIO_printf(bio_err,"-engine e       use engine e, possibly a hardware device.\n");

#endif

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm (default)\n",

			LN_md5,LN_md5);

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm\n",

			LN_md4,LN_md4);

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm\n",

			LN_md2,LN_md2);

#ifndef OPENSSL_NO_SHA

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm\n",

			LN_sha1,LN_sha1);

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm\n",

			LN_sha,LN_sha);

#ifndef OPENSSL_NO_SHA256

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm\n",

			LN_sha256,LN_sha256);

#endif

#ifndef OPENSSL_NO_SHA512

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm\n",

			LN_sha512,LN_sha512);

#endif

#endif

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm\n",

			LN_mdc2,LN_mdc2);

		BIO_printf(bio_err,"-%3s to use the %s message digest algorithm\n",

			LN_ripemd160,LN_ripemd160);

		err=1;

		goto end;

		}

#ifndef OPENSSL_NO_ENGINE

        e = setup_engine(bio_err, engine, 0);

#endif

	in=BIO_new(BIO_s_file());

	bmd=BIO_new(BIO_f_md());

	if (debug)

		{

		BIO_set_callback(in,BIO_debug_callback);

		/* needed for windows 3.1 */

		BIO_set_callback_arg(in,(char *)bio_err);

		}

	if(!app_passwd(bio_err, passargin, NULL, &passin, NULL))

		{

		BIO_printf(bio_err, "Error getting password\n");

		goto end;

		}

	if ((in == NULL) || (bmd == NULL))

		{

		ERR_print_errors(bio_err);

		goto end;

		}

	if(out_bin == -1) {

		if(keyfile) out_bin = 1;

		else out_bin = 0;

	}

	if(randfile)

		app_RAND_load_file(randfile, bio_err, 0);

	if(outfile) {

		if(out_bin)

			out = BIO_new_file(outfile, "wb");

		else    out = BIO_new_file(outfile, "w");

	} else {

		out = BIO_new_fp(stdout, BIO_NOCLOSE);

#ifdef OPENSSL_SYS_VMS

		{

		BIO *tmpbio = BIO_new(BIO_f_linebuffer());

		out = BIO_push(tmpbio, out);

		}

#endif

	}

	if(!out) {

		BIO_printf(bio_err, "Error opening output file %s\n", 

					outfile ? outfile : "(stdout)");

		ERR_print_errors(bio_err);

		goto end;

	}

	if(keyfile)

		{

		if (want_pub)

			sigkey = load_pubkey(bio_err, keyfile, keyform, 0, NULL,

				e, "key file");

		else

			sigkey = load_key(bio_err, keyfile, keyform, 0, passin,

				e, "key file");

		if (!sigkey)

			{

			/* load_[pub]key() has already printed an appropriate

			   message */

			goto end;

			}

		}

	if(sigfile && sigkey) {

		BIO *sigbio;

		sigbio = BIO_new_file(sigfile, "rb");

		siglen = EVP_PKEY_size(sigkey);

		sigbuf = OPENSSL_malloc(siglen);

		if(!sigbio) {

			BIO_printf(bio_err, "Error opening signature file %s\n",

								sigfile);

			ERR_print_errors(bio_err);

			goto end;

		}

		siglen = BIO_read(sigbio, sigbuf, siglen);

		BIO_free(sigbio);

		if(siglen <= 0) {

			BIO_printf(bio_err, "Error reading signature file %s\n",

								sigfile);

			ERR_print_errors(bio_err);

			goto end;

		}

	}

	/* we use md as a filter, reading from 'in' */

	if (!BIO_set_md(bmd,md))

		{

		BIO_printf(bio_err, "Error setting digest %s\n", pname);

		ERR_print_errors(bio_err);

		goto end;

		}

	inp=BIO_push(bmd,in);

	if (argc == 0)

		{

		BIO_set_fp(in,stdin,BIO_NOCLOSE);

  	err=do_fp(out, buf,inp,separator, out_bin, sigkey, sigbuf,

			  siglen,"","(stdin)");

		}

	else

		{

		name=OBJ_nid2sn(md->type);

		for (i=0; i<argc; i++)

			{

			char *tmp,*tofree=NULL;

			int r;

			if (BIO_read_filename(in,argv[i]) <= 0)

				{

				perror(argv[i]);

				err++;

				continue;

				}

			if(!out_bin)

				{

				size_t len = strlen(name)+strlen(argv[i])+5;

				tmp=tofree=OPENSSL_malloc(len);

				BIO_snprintf(tmp,len,"%s(%s)= ",name,argv[i]);

				}

			else

				tmp="";

			r=do_fp(out,buf,inp,separator,out_bin,sigkey,sigbuf,

				siglen,tmp,argv[i]);

			if(r)

			    err=r;

			if(tofree)

				OPENSSL_free(tofree);

			(void)BIO_reset(bmd);

			}

		}

end:

	if (buf != NULL)

		{

		OPENSSL_cleanse(buf,BUFSIZE);

		OPENSSL_free(buf);

		}

	if (in != NULL) BIO_free(in);

	if (passin)

		OPENSSL_free(passin);

	BIO_free_all(out);

	EVP_PKEY_free(sigkey);

	if(sigbuf) OPENSSL_free(sigbuf);

	if (bmd != NULL) BIO_free(bmd);

	apps_shutdown();

	OPENSSL_EXIT(err);

	}

int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout,

	  EVP_PKEY *key, unsigned char *sigin, int siglen, const char *title,

	  const char *file)

	{

	int len;

	int i;

	for (;;)

		{

		i=BIO_read(bp,(char *)buf,BUFSIZE);

		if(i < 0)

			{

			BIO_printf(bio_err, "Read Error in %s\n",file);

			ERR_print_errors(bio_err);

			return 1;

			}

		if (i == 0) break;

		}

	if(sigin)

		{

		EVP_MD_CTX *ctx;

		BIO_get_md_ctx(bp, &ctx);

		i = EVP_VerifyFinal(ctx, sigin, (unsigned int)siglen, key); 

		if(i > 0)

			BIO_printf(out, "Verified OK\n");

		else if(i == 0)

			{

			BIO_printf(out, "Verification Failure\n");

			return 1;

			}

		else

			{

			BIO_printf(bio_err, "Error Verifying Data\n");

			ERR_print_errors(bio_err);

			return 1;

			}

		return 0;

		}

	if(key)

		{

		EVP_MD_CTX *ctx;

		BIO_get_md_ctx(bp, &ctx);

		if(!EVP_SignFinal(ctx, buf, (unsigned int *)&len, key)) 

			{

			BIO_printf(bio_err, "Error Signing Data\n");

			ERR_print_errors(bio_err);

			return 1;

			}

		}

	else

		len=BIO_gets(bp,(char *)buf,BUFSIZE);

	if(binout) BIO_write(out, buf, len);

	else 

		{

		BIO_write(out,title,strlen(title));

		for (i=0; i<len; i++)

			{

			if (sep && (i != 0))

				BIO_printf(out, ":");

			BIO_printf(out, "%02x",buf[i]);

			}

		BIO_printf(out, "\n");

		}

	return 0;

	}