enc.c

/* apps/enc.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 <stdlib.h>
#include <string.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/rand.h>
#include <openssl/pem.h>
#include <openssl/comp.h>
#include <ctype.h>

int set_hex(char *in,unsigned char *out,int size);
#undef SIZE
#undef BSIZE
#undef PROG

#define SIZE	(512)
#define BSIZE	(8*1024)
#define	PROG	enc_main

static void show_ciphers(const OBJ_NAME *name,void *bio_)
	{
	BIO *bio=bio_;
	static int n;

	if(!islower((unsigned char)*name->name))
		return;

	BIO_printf(bio,"-%-25s",name->name);
	if(++n == 3)
		{
		BIO_printf(bio,"\n");
		n=0;
		}
	else
		BIO_printf(bio," ");
	}

int MAIN(int, char **);

int MAIN(int argc, char **argv)
	{
	static const char magic[]="Salted__";
	char mbuf[sizeof magic-1];
	char *strbuf=NULL;
	unsigned char *buff=NULL,*bufsize=NULL;
	int bsize=BSIZE,verbose=0;
	int ret=1,inl;
	int nopad = 0;
	unsigned char key[EVP_MAX_KEY_LENGTH],iv[EVP_MAX_IV_LENGTH];
	unsigned char salt[PKCS5_SALT_LEN];
	char *str=NULL, *passarg = NULL, *pass = NULL;
	char *hkey=NULL,*hiv=NULL,*hsalt = NULL;
	char *md=NULL;
	int enc=1,printkey=0,i,base64=0;
#ifdef ZLIB
	int do_zlib=0;
	BIO *bzl = NULL;
#endif
	int debug=0,olb64=0,nosalt=0;
	const EVP_CIPHER *cipher=NULL,*c;
	EVP_CIPHER_CTX *ctx = NULL;
	char *inf=NULL,*outf=NULL;
	BIO *in=NULL,*out=NULL,*b64=NULL,*benc=NULL,*rbio=NULL,*wbio=NULL;
#define PROG_NAME_SIZE  39
	char pname[PROG_NAME_SIZE+1];
#ifndef OPENSSL_NO_ENGINE
	char *engine = NULL;
#endif
	const EVP_MD *dgst=NULL;

	apps_startup();

	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);
	if (strcmp(pname,"base64") == 0)
		base64=1;
#ifdef ZLIB
	if (strcmp(pname,"zlib") == 0)
		do_zlib=1;
#endif

	cipher=EVP_get_cipherbyname(pname);
#ifdef ZLIB
	if (!do_zlib && !base64 && (cipher == NULL)
				&& (strcmp(pname,"enc") != 0))
#else
	if (!base64 && (cipher == NULL) && (strcmp(pname,"enc") != 0))
#endif
		{
		BIO_printf(bio_err,"%s is an unknown cipher\n",pname);
		goto bad;
		}

	argc--;
	argv++;
	while (argc >= 1)
		{
		if	(strcmp(*argv,"-e") == 0)
			enc=1;
		else if (strcmp(*argv,"-in") == 0)
			{
			if (--argc < 1) goto bad;
			inf= *(++argv);
			}
		else if (strcmp(*argv,"-out") == 0)
			{
			if (--argc < 1) goto bad;
			outf= *(++argv);
			}
		else if (strcmp(*argv,"-pass") == 0)
			{
			if (--argc < 1) goto bad;
			passarg= *(++argv);
			}
#ifndef OPENSSL_NO_ENGINE
		else if (strcmp(*argv,"-engine") == 0)
			{
			if (--argc < 1) goto bad;
			engine= *(++argv);
			}
#endif
		else if	(strcmp(*argv,"-d") == 0)
			enc=0;
		else if	(strcmp(*argv,"-p") == 0)
			printkey=1;
		else if	(strcmp(*argv,"-v") == 0)
			verbose=1;
		else if	(strcmp(*argv,"-nopad") == 0)
			nopad=1;
		else if	(strcmp(*argv,"-salt") == 0)
			nosalt=0;
		else if	(strcmp(*argv,"-nosalt") == 0)
			nosalt=1;
		else if	(strcmp(*argv,"-debug") == 0)
			debug=1;
		else if	(strcmp(*argv,"-P") == 0)
			printkey=2;
		else if	(strcmp(*argv,"-A") == 0)
			olb64=1;
		else if	(strcmp(*argv,"-a") == 0)
			base64=1;
		else if	(strcmp(*argv,"-base64") == 0)
			base64=1;
#ifdef ZLIB
		else if	(strcmp(*argv,"-z") == 0)
			do_zlib=1;
#endif
		else if (strcmp(*argv,"-bufsize") == 0)
			{
			if (--argc < 1) goto bad;
			bufsize=(unsigned char *)*(++argv);
			}
		else if (strcmp(*argv,"-k") == 0)
			{
			if (--argc < 1) goto bad;
			str= *(++argv);
			}
		else if (strcmp(*argv,"-kfile") == 0)
			{
			static char buf[128];
			FILE *infile;
			char *file;

			if (--argc < 1) goto bad;
			file= *(++argv);
			infile=fopen(file,"r");
			if (infile == NULL)
				{
				BIO_printf(bio_err,"unable to read key from '%s'\n",
					file);
				goto bad;
				}
			buf[0]='\0';
			if (!fgets(buf,sizeof buf,infile))
				{
				BIO_printf(bio_err,"unable to read key from '%s'\n",
					file);
				goto bad;
				}
			fclose(infile);
			i=strlen(buf);
			if ((i > 0) &&
				((buf[i-1] == '\n') || (buf[i-1] == '\r')))
				buf[--i]='\0';
			if ((i > 0) &&
				((buf[i-1] == '\n') || (buf[i-1] == '\r')))
				buf[--i]='\0';
			if (i < 1)
				{
				BIO_printf(bio_err,"zero length password\n");
				goto bad;
				}
			str=buf;
			}
		else if (strcmp(*argv,"-K") == 0)
			{
			if (--argc < 1) goto bad;
			hkey= *(++argv);
			}
		else if (strcmp(*argv,"-S") == 0)
			{
			if (--argc < 1) goto bad;
			hsalt= *(++argv);
			}
		else if (strcmp(*argv,"-iv") == 0)
			{
			if (--argc < 1) goto bad;
			hiv= *(++argv);
			}
		else if (strcmp(*argv,"-md") == 0)
			{
			if (--argc < 1) goto bad;
			md= *(++argv);
			}
		else if	((argv[0][0] == '-') &&
			((c=EVP_get_cipherbyname(&(argv[0][1]))) != NULL))
			{
			cipher=c;
			}
		else if (strcmp(*argv,"-none") == 0)
			cipher=NULL;
		else
			{
			BIO_printf(bio_err,"unknown option '%s'\n",*argv);
bad:
			BIO_printf(bio_err,"options are\n");
			BIO_printf(bio_err,"%-14s input file\n","-in <file>");
			BIO_printf(bio_err,"%-14s output file\n","-out <file>");
			BIO_printf(bio_err,"%-14s pass phrase source\n","-pass <arg>");
			BIO_printf(bio_err,"%-14s encrypt\n","-e");
			BIO_printf(bio_err,"%-14s decrypt\n","-d");
			BIO_printf(bio_err,"%-14s base64 encode/decode, depending on encryption flag\n","-a/-base64");
			BIO_printf(bio_err,"%-14s passphrase is the next argument\n","-k");
			BIO_printf(bio_err,"%-14s passphrase is the first line of the file argument\n","-kfile");
			BIO_printf(bio_err,"%-14s the next argument is the md to use to create a key\n","-md");
			BIO_printf(bio_err,"%-14s   from a passphrase.  One of md2, md5, sha or sha1\n","");
			BIO_printf(bio_err,"%-14s salt in hex is the next argument\n","-S");
			BIO_printf(bio_err,"%-14s key/iv in hex is the next argument\n","-K/-iv");
			BIO_printf(bio_err,"%-14s print the iv/key (then exit if -P)\n","-[pP]");
			BIO_printf(bio_err,"%-14s buffer size\n","-bufsize <n>");
			BIO_printf(bio_err,"%-14s disable standard block padding\n","-nopad");
#ifndef OPENSSL_NO_ENGINE
			BIO_printf(bio_err,"%-14s use engine e, possibly a hardware device.\n","-engine e");
#endif

			BIO_printf(bio_err,"Cipher Types\n");
			OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
					       show_ciphers,
					       bio_err);
			BIO_printf(bio_err,"\n");

			goto end;
			}
		argc--;
		argv++;
		}

#ifndef OPENSSL_NO_ENGINE
        setup_engine(bio_err, engine, 0);
#endif

	if (md && (dgst=EVP_get_digestbyname(md)) == NULL)
		{
		BIO_printf(bio_err,"%s is an unsupported message digest type\n",md);
		goto end;
		}

	if (dgst == NULL)
		{
		dgst = EVP_md5();
		}

	if (bufsize != NULL)
		{
		unsigned long n;

		for (n=0; *bufsize; bufsize++)
			{
			i= *bufsize;
			if ((i <= '9') && (i >= '0'))
				n=n*10+i-'0';
			else if (i == 'k')
				{
				n*=1024;
				bufsize++;
				break;
				}
			}
		if (*bufsize != '\0')
			{
			BIO_printf(bio_err,"invalid 'bufsize' specified.\n");
			goto end;
			}

		/* It must be large enough for a base64 encoded line */
		if (base64 && n < 80) n=80;

		bsize=(int)n;
		if (verbose) BIO_printf(bio_err,"bufsize=%d\n",bsize);
		}

	strbuf=OPENSSL_malloc(SIZE);
	buff=(unsigned char *)OPENSSL_malloc(EVP_ENCODE_LENGTH(bsize));
	if ((buff == NULL) || (strbuf == NULL))
		{
		BIO_printf(bio_err,"OPENSSL_malloc failure %ld\n",(long)EVP_ENCODE_LENGTH(bsize));
		goto end;
		}

	in=BIO_new(BIO_s_file());
	out=BIO_new(BIO_s_file());
	if ((in == NULL) || (out == NULL))
		{
		ERR_print_errors(bio_err);
		goto end;
		}
	if (debug)
		{
		BIO_set_callback(in,BIO_debug_callback);
		BIO_set_callback(out,BIO_debug_callback);
		BIO_set_callback_arg(in,(char *)bio_err);
		BIO_set_callback_arg(out,(char *)bio_err);
		}

	if (inf == NULL)
	        {
#ifndef OPENSSL_NO_SETVBUF_IONBF
		if (bufsize != NULL)
			setvbuf(stdin, (char *)NULL, _IONBF, 0);
#endif /* ndef OPENSSL_NO_SETVBUF_IONBF */
		BIO_set_fp(in,stdin,BIO_NOCLOSE);
	        }
	else
		{
		if (BIO_read_filename(in,inf) <= 0)
			{
			perror(inf);
			goto end;
			}
		}

	if(!str && passarg) {
		if(!app_passwd(bio_err, passarg, NULL, &pass, NULL)) {
			BIO_printf(bio_err, "Error getting password\n");
			goto end;
		}
		str = pass;
	}

	if ((str == NULL) && (cipher != NULL) && (hkey == NULL))
		{
		for (;;)
			{
			char buf[200];

			BIO_snprintf(buf,sizeof buf,"enter %s %s password:",
				     OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
				     (enc)?"encryption":"decryption");
			strbuf[0]='\0';
			i=EVP_read_pw_string((char *)strbuf,SIZE,buf,enc);
			if (i == 0)
				{
				if (strbuf[0] == '\0')
					{
					ret=1;
					goto end;
					}
				str=strbuf;
				break;
				}
			if (i < 0)
				{
				BIO_printf(bio_err,"bad password read\n");
				goto end;
				}
			}
		}


	if (outf == NULL)
		{
		BIO_set_fp(out,stdout,BIO_NOCLOSE);
#ifndef OPENSSL_NO_SETVBUF_IONBF
		if (bufsize != NULL)
			setvbuf(stdout, (char *)NULL, _IONBF, 0);
#endif /* ndef OPENSSL_NO_SETVBUF_IONBF */
#ifdef OPENSSL_SYS_VMS
		{
		BIO *tmpbio = BIO_new(BIO_f_linebuffer());
		out = BIO_push(tmpbio, out);
		}
#endif
		}
	else
		{
		if (BIO_write_filename(out,outf) <= 0)
			{
			perror(outf);
			goto end;
			}
		}

	rbio=in;
	wbio=out;

#ifdef ZLIB

	if (do_zlib)
		{
		if ((bzl=BIO_new(BIO_f_zlib())) == NULL)
			goto end;
		if (enc)
			wbio=BIO_push(bzl,wbio);
		else
			rbio=BIO_push(bzl,rbio);
		}
#endif

	if (base64)
		{
		if ((b64=BIO_new(BIO_f_base64())) == NULL)
			goto end;
		if (debug)
			{
			BIO_set_callback(b64,BIO_debug_callback);
			BIO_set_callback_arg(b64,(char *)bio_err);
			}
		if (olb64)
			BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
		if (enc)
			wbio=BIO_push(b64,wbio);
		else
			rbio=BIO_push(b64,rbio);
		}

	if (cipher != NULL)
		{
		/* Note that str is NULL if a key was passed on the command
		 * line, so we get no salt in that case. Is this a bug?
		 */
		if (str != NULL)
			{
			/* Salt handling: if encrypting generate a salt and
			 * write to output BIO. If decrypting read salt from
			 * input BIO.
			 */
			unsigned char *sptr;
			if(nosalt) sptr = NULL;
			else {
				if(enc) {
					if(hsalt) {
						if(!set_hex(hsalt,salt,sizeof salt)) {
							BIO_printf(bio_err,
								"invalid hex salt value\n");
							goto end;
						}
					} else if (RAND_pseudo_bytes(salt, sizeof salt) < 0)
						goto end;
					/* If -P option then don't bother writing */
					if((printkey != 2)
					   && (BIO_write(wbio,magic,
							 sizeof magic-1) != sizeof magic-1
					       || BIO_write(wbio,
							    (char *)salt,
							    sizeof salt) != sizeof salt)) {
						BIO_printf(bio_err,"error writing output file\n");
						goto end;
					}
				} else if(BIO_read(rbio,mbuf,sizeof mbuf) != sizeof mbuf
					  || BIO_read(rbio,
						      (unsigned char *)salt,
				    sizeof salt) != sizeof salt) {
					BIO_printf(bio_err,"error reading input file\n");
					goto end;
				} else if(memcmp(mbuf,magic,sizeof magic-1)) {
				    BIO_printf(bio_err,"bad magic number\n");
				    goto end;
				}

				sptr = salt;
			}

			EVP_BytesToKey(cipher,dgst,sptr,
				(unsigned char *)str,
				strlen(str),1,key,iv);
			/* zero the complete buffer or the string
			 * passed from the command line
			 * bug picked up by
			 * Larry J. Hughes Jr. <hughes@indiana.edu> */
			if (str == strbuf)
				OPENSSL_cleanse(str,SIZE);
			else
				OPENSSL_cleanse(str,strlen(str));
			}
		if ((hiv != NULL) && !set_hex(hiv,iv,sizeof iv))
			{
			BIO_printf(bio_err,"invalid hex iv value\n");
			goto end;
			}
		if ((hiv == NULL) && (str == NULL)
		    && EVP_CIPHER_iv_length(cipher) != 0)
			{
			/* No IV was explicitly set and no IV was generated
			 * during EVP_BytesToKey. Hence the IV is undefined,
			 * making correct decryption impossible. */
			BIO_printf(bio_err, "iv undefined\n");
			goto end;
			}
		if ((hkey != NULL) && !set_hex(hkey,key,sizeof key))
			{
			BIO_printf(bio_err,"invalid hex key value\n");
			goto end;
			}

		if ((benc=BIO_new(BIO_f_cipher())) == NULL)
			goto end;

		/* Since we may be changing parameters work on the encryption
		 * context rather than calling BIO_set_cipher().
		 */

		BIO_get_cipher_ctx(benc, &ctx);
		if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc))
			{
			BIO_printf(bio_err, "Error setting cipher %s\n",
				EVP_CIPHER_name(cipher));
			ERR_print_errors(bio_err);
			goto end;
			}

		if (nopad)
			EVP_CIPHER_CTX_set_padding(ctx, 0);

		if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc))
			{
			BIO_printf(bio_err, "Error setting cipher %s\n",
				EVP_CIPHER_name(cipher));
			ERR_print_errors(bio_err);
			goto end;
			}

		if (debug)
			{
			BIO_set_callback(benc,BIO_debug_callback);
			BIO_set_callback_arg(benc,(char *)bio_err);
			}

		if (printkey)
			{
			if (!nosalt)
				{
				printf("salt=");
				for (i=0; i<(int)sizeof(salt); i++)
					printf("%02X",salt[i]);
				printf("\n");
				}
			if (cipher->key_len > 0)
				{
				printf("key=");
				for (i=0; i<cipher->key_len; i++)
					printf("%02X",key[i]);
				printf("\n");
				}
			if (cipher->iv_len > 0)
				{
				printf("iv =");
				for (i=0; i<cipher->iv_len; i++)
					printf("%02X",iv[i]);
				printf("\n");
				}
			if (printkey == 2)
				{
				ret=0;
				goto end;
				}
			}
		}

	/* Only encrypt/decrypt as we write the file */
	if (benc != NULL)
		wbio=BIO_push(benc,wbio);

	for (;;)
		{
		inl=BIO_read(rbio,(char *)buff,bsize);
		if (inl <= 0) break;
		if (BIO_write(wbio,(char *)buff,inl) != inl)
			{
			BIO_printf(bio_err,"error writing output file\n");
			goto end;
			}
		}
	if (!BIO_flush(wbio))
		{
		BIO_printf(bio_err,"bad decrypt\n");
		goto end;
		}

	ret=0;
	if (verbose)
		{
		BIO_printf(bio_err,"bytes read   :%8ld\n",BIO_number_read(in));
		BIO_printf(bio_err,"bytes written:%8ld\n",BIO_number_written(out));
		}
end:
	ERR_print_errors(bio_err);
	if (strbuf != NULL) OPENSSL_free(strbuf);
	if (buff != NULL) OPENSSL_free(buff);
	if (in != NULL) BIO_free(in);
	if (out != NULL) BIO_free_all(out);
	if (benc != NULL) BIO_free(benc);
	if (b64 != NULL) BIO_free(b64);
#ifdef ZLIB
	if (bzl != NULL) BIO_free(bzl);
#endif
	if(pass) OPENSSL_free(pass);
	apps_shutdown();
	OPENSSL_EXIT(ret);
	}

int set_hex(char *in, unsigned char *out, int size)
	{
	int i,n;
	unsigned char j;

	n=strlen(in);
	if (n > (size*2))
		{
		BIO_printf(bio_err,"hex string is too long\n");
		return(0);
		}
	memset(out,0,size);
	for (i=0; i<n; i++)
		{
		j=(unsigned char)*in;
		*(in++)='\0';
		if (j == 0) break;
		if ((j >= '0') && (j <= '9'))
			j-='0';
		else if ((j >= 'A') && (j <= 'F'))
			j=j-'A'+10;
		else if ((j >= 'a') && (j <= 'f'))
			j=j-'a'+10;
		else
			{
			BIO_printf(bio_err,"non-hex digit\n");
			return(0);
			}
		if (i&1)
			out[i/2]|=j;
		else
			out[i/2]=(j<<4);
		}
	return(1);
	}