/* $OpenBSD: enc.c,v 1.31 2023/07/29 17:15:45 tb Exp $ */
/* 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 <unistd.h>

#include "apps.h"

#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>

int set_hex(char *in, unsigned char *out, int size);

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

static struct {
        int base64;
        char *bufsize;
        const EVP_CIPHER *cipher;
        int debug;
        int enc;
        char *hiv;
        char *hkey;
        char *hsalt;
        char *inf;
        int iter;
        char *keyfile;
        char *keystr;
        char *md;
        int nopad;
        int nosalt;
        int olb64;
        char *outf;
        char *passarg;
        int pbkdf2;
        int printkey;
        int verbose;
} cfg;

static int
enc_opt_cipher(int argc, char **argv, int *argsused)
{
        char *name = argv[0];

        if (*name++ != '-')
                return (1);

        if (strcmp(name, "none") == 0) {
                cfg.cipher = NULL;
                *argsused = 1;
                return (0);
        }

        if ((cfg.cipher = EVP_get_cipherbyname(name)) != NULL) {
                *argsused = 1;
                return (0);
        }

        return (1);
}

static const struct option enc_options[] = {
        {
                .name = "A",
                .desc = "Process base64 data on one line (requires -a)",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.olb64,
        },
        {
                .name = "a",
                .desc = "Perform base64 encoding/decoding (alias -base64)",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.base64,
        },
        {
                .name = "base64",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.base64,
        },
        {
                .name = "bufsize",
                .argname = "size",
                .desc = "Specify the buffer size to use for I/O",
                .type = OPTION_ARG,
                .opt.arg = &cfg.bufsize,
        },
        {
                .name = "d",
                .desc = "Decrypt the input data",
                .type = OPTION_VALUE,
                .opt.value = &cfg.enc,
                .value = 0,
        },
        {
                .name = "debug",
                .desc = "Print debugging information",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.debug,
        },
        {
                .name = "e",
                .desc = "Encrypt the input data (default)",
                .type = OPTION_VALUE,
                .opt.value = &cfg.enc,
                .value = 1,
        },
        {
                .name = "in",
                .argname = "file",
                .desc = "Input file to read from (default stdin)",
                .type = OPTION_ARG,
                .opt.arg = &cfg.inf,
        },
        {
                .name = "iter",
                .argname = "iterations",
                .desc = "Specify iteration count and force use of PBKDF2",
                .type = OPTION_ARG_INT,
                .opt.value = &cfg.iter,
        },
        {
                .name = "iv",
                .argname = "IV",
                .desc = "IV to use, specified as a hexadecimal string",
                .type = OPTION_ARG,
                .opt.arg = &cfg.hiv,
        },
        {
                .name = "K",
                .argname = "key",
                .desc = "Key to use, specified as a hexadecimal string",
                .type = OPTION_ARG,
                .opt.arg = &cfg.hkey,
        },
        {
                .name = "k",            /* Superseded by -pass. */
                .type = OPTION_ARG,
                .opt.arg = &cfg.keystr,
        },
        {
                .name = "kfile",        /* Superseded by -pass. */
                .type = OPTION_ARG,
                .opt.arg = &cfg.keyfile,
        },
        {
                .name = "md",
                .argname = "digest",
                .desc = "Digest to use to create a key from the passphrase",
                .type = OPTION_ARG,
                .opt.arg = &cfg.md,
        },
        {
                .name = "none",
                .desc = "Use NULL cipher (no encryption or decryption)",
                .type = OPTION_ARGV_FUNC,
                .opt.argvfunc = enc_opt_cipher,
        },
        {
                .name = "nopad",
                .desc = "Disable standard block padding",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.nopad,
        },
        {
                .name = "nosalt",
                .type = OPTION_VALUE,
                .opt.value = &cfg.nosalt,
                .value = 1,
        },
        {
                .name = "out",
                .argname = "file",
                .desc = "Output file to write to (default stdout)",
                .type = OPTION_ARG,
                .opt.arg = &cfg.outf,
        },
        {
                .name = "P",
                .desc = "Print out the salt, key and IV used, then exit\n"
                    "  (no encryption or decryption is performed)",
                .type = OPTION_VALUE,
                .opt.value = &cfg.printkey,
                .value = 2,
        },
        {
                .name = "p",
                .desc = "Print out the salt, key and IV used",
                .type = OPTION_VALUE,
                .opt.value = &cfg.printkey,
                .value = 1,
        },
        {
                .name = "pass",
                .argname = "source",
                .desc = "Password source",
                .type = OPTION_ARG,
                .opt.arg = &cfg.passarg,
        },
        {
                .name = "pbkdf2",
                .desc = "Use the pbkdf2 key derivation function",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.pbkdf2,
        },
        {
                .name = "S",
                .argname = "salt",
                .desc = "Salt to use, specified as a hexadecimal string",
                .type = OPTION_ARG,
                .opt.arg = &cfg.hsalt,
        },
        {
                .name = "salt",
                .desc = "Use a salt in the key derivation routines (default)",
                .type = OPTION_VALUE,
                .opt.value = &cfg.nosalt,
                .value = 0,
        },
        {
                .name = "v",
                .desc = "Verbose",
                .type = OPTION_FLAG,
                .opt.flag = &cfg.verbose,
        },
        {
                .name = NULL,
                .type = OPTION_ARGV_FUNC,
                .opt.argvfunc = enc_opt_cipher,
        },
        { NULL },
};

static void
skip_aead_and_xts(const OBJ_NAME *name, void *arg)
{
        const EVP_CIPHER *cipher;

        if ((cipher = EVP_get_cipherbyname(name->name)) == NULL)
                return;

        if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0)
                return;
        if (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)
                return;

        show_cipher(name, arg);
}

static void
enc_usage(void)
{
        int n = 0;

        fprintf(stderr, "usage: enc -ciphername [-AadePp] [-base64] "
            "[-bufsize number] [-debug]\n"
            "    [-in file] [-iter iterations] [-iv IV] [-K key] "
            "[-k password]\n"
            "    [-kfile file] [-md digest] [-none] [-nopad] [-nosalt]\n"
            "    [-out file] [-pass source] [-pbkdf2] [-S salt] [-salt]\n\n");
        options_usage(enc_options);
        fprintf(stderr, "\n");

        fprintf(stderr, "Valid ciphername values:\n\n");
        OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, skip_aead_and_xts, &n);
        fprintf(stderr, "\n");
}

int
enc_main(int argc, char **argv)
{
        static const char magic[] = "Salted__";
        char mbuf[sizeof magic - 1];
        char *strbuf = NULL, *pass = NULL;
        unsigned char *buff = NULL;
        int bsize = BSIZE;
        int ret = 1, inl;
        unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
        unsigned char salt[PKCS5_SALT_LEN];
        EVP_CIPHER_CTX *ctx = NULL;
        const EVP_MD *dgst = NULL;
        BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL;
        BIO *rbio = NULL, *wbio = NULL;
#define PROG_NAME_SIZE  39
        char pname[PROG_NAME_SIZE + 1];
        int i;

        if (pledge("stdio cpath wpath rpath tty", NULL) == -1) {
                perror("pledge");
                exit(1);
        }

        memset(&cfg, 0, sizeof(cfg));
        cfg.enc = 1;

        /* first check the program name */
        program_name(argv[0], pname, sizeof(pname));

        if (strcmp(pname, "base64") == 0)
                cfg.base64 = 1;

        cfg.cipher = EVP_get_cipherbyname(pname);

        if (!cfg.base64 && cfg.cipher == NULL && strcmp(pname, "enc") != 0) {
                BIO_printf(bio_err, "%s is an unknown cipher\n", pname);
                goto end;
        }

        if (options_parse(argc, argv, enc_options, NULL, NULL) != 0) {
                enc_usage();
                goto end;
        }

        if (cfg.keyfile != NULL) {
                static char buf[128];
                FILE *infile;

                infile = fopen(cfg.keyfile, "r");
                if (infile == NULL) {
                        BIO_printf(bio_err, "unable to read key from '%s'\n",
                            cfg.keyfile);
                        goto end;
                }
                buf[0] = '\0';
                if (!fgets(buf, sizeof buf, infile)) {
                        BIO_printf(bio_err, "unable to read key from '%s'\n",
                            cfg.keyfile);
                        fclose(infile);
                        goto end;
                }
                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 end;
                }
                cfg.keystr = buf;
        }

        if (cfg.cipher != NULL &&
            (EVP_CIPHER_flags(cfg.cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0) {
                BIO_printf(bio_err, "enc does not support AEAD ciphers\n");
                goto end;
        }

        if (cfg.cipher != NULL &&
            EVP_CIPHER_mode(cfg.cipher) == EVP_CIPH_XTS_MODE) {
                BIO_printf(bio_err, "enc does not support XTS mode\n");
                goto end;
        }

        if (cfg.md != NULL &&
            (dgst = EVP_get_digestbyname(cfg.md)) == NULL) {
                BIO_printf(bio_err,
                    "%s is an unsupported message digest type\n",
                    cfg.md);
                goto end;
        }
        if (dgst == NULL)
                dgst = EVP_sha256();

        if (cfg.bufsize != NULL) {
                char *p = cfg.bufsize;
                unsigned long n;

                /* XXX - provide an OPTION_ARG_DISKUNIT. */
                for (n = 0; *p != '\0'; p++) {
                        i = *p;
                        if ((i <= '9') && (i >= '0'))
                                n = n * 10 + i - '0';
                        else if (i == 'k') {
                                n *= 1024;
                                p++;
                                break;
                        }
                }
                if (*p != '\0') {
                        BIO_printf(bio_err, "invalid 'bufsize' specified.\n");
                        goto end;
                }
                /* It must be large enough for a base64 encoded line. */
                if (cfg.base64 && n < 80)
                        n = 80;

                bsize = (int)n;
                if (cfg.verbose)
                        BIO_printf(bio_err, "bufsize=%d\n", bsize);
        }
        strbuf = malloc(SIZE);
        buff = malloc(EVP_ENCODE_LENGTH(bsize));
        if (buff == NULL || strbuf == NULL) {
                BIO_printf(bio_err, "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 (cfg.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 (cfg.inf == NULL) {
                if (cfg.bufsize != NULL)
                        setvbuf(stdin, (char *) NULL, _IONBF, 0);
                BIO_set_fp(in, stdin, BIO_NOCLOSE);
        } else {
                if (BIO_read_filename(in, cfg.inf) <= 0) {
                        perror(cfg.inf);
                        goto end;
                }
        }

        if (!cfg.keystr && cfg.passarg) {
                if (!app_passwd(bio_err, cfg.passarg, NULL, &pass, NULL)) {
                        BIO_printf(bio_err, "Error getting password\n");
                        goto end;
                }
                cfg.keystr = pass;
        }
        if (cfg.keystr == NULL && cfg.cipher != NULL && cfg.hkey == NULL) {
                for (;;) {
                        char buf[200];
                        int retval;

                        retval = snprintf(buf, sizeof buf,
                            "enter %s %s password:",
                            OBJ_nid2ln(EVP_CIPHER_nid(cfg.cipher)),
                            cfg.enc ? "encryption" : "decryption");
                        if ((size_t)retval >= sizeof buf) {
                                BIO_printf(bio_err,
                                    "Password prompt too long\n");
                                goto end;
                        }
                        strbuf[0] = '\0';
                        i = EVP_read_pw_string((char *)strbuf, SIZE, buf,
                            cfg.enc);
                        if (i == 0) {
                                if (strbuf[0] == '\0') {
                                        ret = 1;
                                        goto end;
                                }
                                cfg.keystr = strbuf;
                                break;
                        }
                        if (i < 0) {
                                BIO_printf(bio_err, "bad password read\n");
                                goto end;
                        }
                }
        }
        if (cfg.outf == NULL) {
                BIO_set_fp(out, stdout, BIO_NOCLOSE);
                if (cfg.bufsize != NULL)
                        setvbuf(stdout, (char *)NULL, _IONBF, 0);
        } else {
                if (BIO_write_filename(out, cfg.outf) <= 0) {
                        perror(cfg.outf);
                        goto end;
                }
        }

        rbio = in;
        wbio = out;

        if (cfg.base64) {
                if ((b64 = BIO_new(BIO_f_base64())) == NULL)
                        goto end;
                if (cfg.debug) {
                        BIO_set_callback(b64, BIO_debug_callback);
                        BIO_set_callback_arg(b64, (char *) bio_err);
                }
                if (cfg.olb64)
                        BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
                if (cfg.enc)
                        wbio = BIO_push(b64, wbio);
                else
                        rbio = BIO_push(b64, rbio);
        }
        if (cfg.cipher != NULL) {
                /*
                 * Note that keystr is NULL if a key was passed on the command
                 * line, so we get no salt in that case. Is this a bug?
                 */
                if (cfg.keystr != NULL) {
                        /*
                         * Salt handling: if encrypting generate a salt and
                         * write to output BIO. If decrypting read salt from
                         * input BIO.
                         */
                        unsigned char *sptr;
                        if (cfg.nosalt)
                                sptr = NULL;
                        else {
                                if (cfg.enc) {
                                        if (cfg.hsalt) {
                                                if (!set_hex(cfg.hsalt, salt, sizeof salt)) {
                                                        BIO_printf(bio_err,
                                                            "invalid hex salt value\n");
                                                        goto end;
                                                }
                                        } else
                                                arc4random_buf(salt,
                                                    sizeof(salt));
                                        /*
                                         * If -P option then don't bother
                                         * writing
                                         */
                                        if ((cfg.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;
                        }
                        if (cfg.pbkdf2 == 1 || cfg.iter > 0) {
                                /*
                                 * derive key and default iv
                                 * concatenated into a temporary buffer
                                 */
                                unsigned char tmpkeyiv[EVP_MAX_KEY_LENGTH + EVP_MAX_IV_LENGTH];
                                int iklen = EVP_CIPHER_key_length(cfg.cipher);
                                int ivlen = EVP_CIPHER_iv_length(cfg.cipher);
                                /* not needed if HASH_UPDATE() is fixed : */
                                int islen = (sptr != NULL ? sizeof(salt) : 0);

                                if (cfg.iter == 0)
                                        cfg.iter = 10000;

                                if (!PKCS5_PBKDF2_HMAC(cfg.keystr,
                                        strlen(cfg.keystr), sptr, islen,
                                        cfg.iter, dgst, iklen+ivlen, tmpkeyiv)) {
                                        BIO_printf(bio_err, "PKCS5_PBKDF2_HMAC failed\n");
                                        goto end;
                                }
                                /* split and move data back to global buffer */
                                memcpy(key, tmpkeyiv, iklen);
                                memcpy(iv, tmpkeyiv + iklen, ivlen);
                                explicit_bzero(tmpkeyiv, sizeof tmpkeyiv);
                        } else {
                                EVP_BytesToKey(cfg.cipher, dgst, sptr,
                                    (unsigned char *)cfg.keystr,
                                    strlen(cfg.keystr), 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 (cfg.keystr == strbuf)
                                explicit_bzero(cfg.keystr, SIZE);
                        else
                                explicit_bzero(cfg.keystr,
                                    strlen(cfg.keystr));
                }
                if (cfg.hiv != NULL && !set_hex(cfg.hiv, iv, sizeof iv)) {
                        BIO_printf(bio_err, "invalid hex iv value\n");
                        goto end;
                }
                if (cfg.hiv == NULL && cfg.keystr == NULL &&
                    EVP_CIPHER_iv_length(cfg.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 (cfg.hkey != NULL && !set_hex(cfg.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, cfg.cipher, NULL, NULL,
                    NULL, cfg.enc)) {
                        BIO_printf(bio_err, "Error setting cipher %s\n",
                            EVP_CIPHER_name(cfg.cipher));
                        ERR_print_errors(bio_err);
                        goto end;
                }
                if (cfg.nopad)
                        EVP_CIPHER_CTX_set_padding(ctx, 0);

                if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, cfg.enc)) {
                        BIO_printf(bio_err, "Error setting cipher %s\n",
                            EVP_CIPHER_name(cfg.cipher));
                        ERR_print_errors(bio_err);
                        goto end;
                }
                if (cfg.debug) {
                        BIO_set_callback(benc, BIO_debug_callback);
                        BIO_set_callback_arg(benc, (char *) bio_err);
                }
                if (cfg.printkey) {
                        int key_len, iv_len;

                        if (!cfg.nosalt) {
                                printf("salt=");
                                for (i = 0; i < (int) sizeof(salt); i++)
                                        printf("%02X", salt[i]);
                                printf("\n");
                        }
                        key_len = EVP_CIPHER_key_length(cfg.cipher);
                        if (key_len > 0) {
                                printf("key=");
                                for (i = 0; i < key_len; i++)
                                        printf("%02X", key[i]);
                                printf("\n");
                        }
                        iv_len = EVP_CIPHER_iv_length(cfg.cipher);
                        if (iv_len > 0) {
                                printf("iv =");
                                for (i = 0; i < iv_len; i++)
                                        printf("%02X", iv[i]);
                                printf("\n");
                        }
                        if (cfg.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 (cfg.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);
        free(strbuf);
        free(buff);
        BIO_free(in);
        BIO_free_all(out);
        BIO_free(benc);
        BIO_free(b64);
        free(pass);

        return (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);
}