enc.c

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/* 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 <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)
        {
#ifndef OPENSSL_NO_ENGINE
        ENGINE *e = NULL;
#endif
        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;
        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;

        cipher=EVP_get_cipherbyname(pname);
        if (!base64 && (cipher == NULL) && (strcmp(pname,"enc") != 0))
                {
                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;
                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';
                        fgets(buf,sizeof buf,infile);
                        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 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>");
#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
        e = 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 (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,bio_err);
                BIO_set_callback_arg(out,bio_err);
                }

        if (inf == NULL)
                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);
#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;

        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,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))
                        {
                        /* 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,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);
        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);
        }

---

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