/*

 * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <limits.h>

#include "apps.h"

#include "progs.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>

#ifndef OPENSSL_NO_COMP

# include <openssl/comp.h>

#endif

#include <ctype.h>

#undef SIZE

#undef BSIZE

#define SIZE    (512)

#define BSIZE   (8*1024)

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

static void show_ciphers(const OBJ_NAME *name, void *bio_);

struct doall_enc_ciphers {

    BIO *bio;

    int n;

};

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_LIST,

    OPT_E, OPT_IN, OPT_OUT, OPT_PASS, OPT_ENGINE, OPT_D, OPT_P, OPT_V,

    OPT_NOPAD, OPT_SALT, OPT_NOSALT, OPT_DEBUG, OPT_UPPER_P, OPT_UPPER_A,

    OPT_A, OPT_Z, OPT_BUFSIZE, OPT_K, OPT_KFILE, OPT_UPPER_K, OPT_NONE,

    OPT_UPPER_S, OPT_IV, OPT_MD, OPT_ITER, OPT_PBKDF2, OPT_CIPHER,

    OPT_R_ENUM

} OPTION_CHOICE;

const OPTIONS enc_options[] = {

    {"help", OPT_HELP, '-', "Display this summary"},

    {"list", OPT_LIST, '-', "List ciphers"},

    {"ciphers", OPT_LIST, '-', "Alias for -list"},

    {"in", OPT_IN, '<', "Input file"},

    {"out", OPT_OUT, '>', "Output file"},

    {"pass", OPT_PASS, 's', "Passphrase source"},

    {"e", OPT_E, '-', "Encrypt"},

    {"d", OPT_D, '-', "Decrypt"},

    {"p", OPT_P, '-', "Print the iv/key"},

    {"P", OPT_UPPER_P, '-', "Print the iv/key and exit"},

    {"v", OPT_V, '-', "Verbose output"},

    {"nopad", OPT_NOPAD, '-', "Disable standard block padding"},

    {"salt", OPT_SALT, '-', "Use salt in the KDF (default)"},

    {"nosalt", OPT_NOSALT, '-', "Do not use salt in the KDF"},

    {"debug", OPT_DEBUG, '-', "Print debug info"},

    {"a", OPT_A, '-', "Base64 encode/decode, depending on encryption flag"},

    {"base64", OPT_A, '-', "Same as option -a"},

    {"A", OPT_UPPER_A, '-',

     "Used with -[base64|a] to specify base64 buffer as a single line"},

    {"bufsize", OPT_BUFSIZE, 's', "Buffer size"},

    {"k", OPT_K, 's', "Passphrase"},

    {"kfile", OPT_KFILE, '<', "Read passphrase from file"},

    {"K", OPT_UPPER_K, 's', "Raw key, in hex"},

    {"S", OPT_UPPER_S, 's', "Salt, in hex"},

    {"iv", OPT_IV, 's', "IV in hex"},

    {"md", OPT_MD, 's', "Use specified digest to create a key from the passphrase"},

    {"iter", OPT_ITER, 'p', "Specify the iteration count and force use of PBKDF2"},

    {"pbkdf2", OPT_PBKDF2, '-', "Use password-based key derivation function 2"},

    {"none", OPT_NONE, '-', "Don't encrypt"},

    {"", OPT_CIPHER, '-', "Any supported cipher"},

    OPT_R_OPTIONS,

#ifdef ZLIB

    {"z", OPT_Z, '-', "Use zlib as the 'encryption'"},

#endif

#ifndef OPENSSL_NO_ENGINE

    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},

#endif

    {NULL}

};

int enc_main(int argc, char **argv)

{

    static char buf[128];

    static const char magic[] = "Salted__";

    ENGINE *e = NULL;

    BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =

        NULL, *wbio = NULL;

    EVP_CIPHER_CTX *ctx = NULL;

    const EVP_CIPHER *cipher = NULL, *c;

    const EVP_MD *dgst = NULL;

    char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p;

    char *infile = NULL, *outfile = NULL, *prog;

    char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL;

    char mbuf[sizeof(magic) - 1];

    OPTION_CHOICE o;

    int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0;

    int enc = 1, printkey = 0, i, k;

    int base64 = 0, informat = FORMAT_BINARY, outformat = FORMAT_BINARY;

    int ret = 1, inl, nopad = 0;

    unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];

    unsigned char *buff = NULL, salt[PKCS5_SALT_LEN];

    int pbkdf2 = 0;

    int iter = 0;

    long n;

    struct doall_enc_ciphers dec;

#ifdef ZLIB

    int do_zlib = 0;

    BIO *bzl = NULL;

#endif

    /* first check the program name */

    prog = opt_progname(argv[0]);

    if (strcmp(prog, "base64") == 0) {

        base64 = 1;

#ifdef ZLIB

    } else if (strcmp(prog, "zlib") == 0) {

        do_zlib = 1;

#endif

    } else {

        cipher = EVP_get_cipherbyname(prog);

        if (cipher == NULL && strcmp(prog, "enc") != 0) {

            BIO_printf(bio_err, "%s is not a known cipher\n", prog);

            goto end;

        }

    }

    prog = opt_init(argc, argv, enc_options);

    while ((o = opt_next()) != OPT_EOF) {

        switch (o) {

        case OPT_EOF:

        case OPT_ERR:

 opthelp:

            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);

            goto end;

        case OPT_HELP:

            opt_help(enc_options);

            ret = 0;

            goto end;

        case OPT_LIST:

            BIO_printf(bio_out, "Supported ciphers:\n");

            dec.bio = bio_out;

            dec.n = 0;

            OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,

                                   show_ciphers, &dec;;

            BIO_printf(bio_out, "\n");

            ret = 0;

            goto end;

        case OPT_E:

            enc = 1;

            break;

        case OPT_IN:

            infile = opt_arg();

            break;

        case OPT_OUT:

            outfile = opt_arg();

            break;

        case OPT_PASS:

            passarg = opt_arg();

            break;

        case OPT_ENGINE:

            e = setup_engine(opt_arg(), 0);

            break;

        case OPT_D:

            enc = 0;

            break;

        case OPT_P:

            printkey = 1;

            break;

        case OPT_V:

            verbose = 1;

            break;

        case OPT_NOPAD:

            nopad = 1;

            break;

        case OPT_SALT:

            nosalt = 0;

            break;

        case OPT_NOSALT:

            nosalt = 1;

            break;

        case OPT_DEBUG:

            debug = 1;

            break;

        case OPT_UPPER_P:

            printkey = 2;

            break;

        case OPT_UPPER_A:

            olb64 = 1;

            break;

        case OPT_A:

            base64 = 1;

            break;

        case OPT_Z:

#ifdef ZLIB

            do_zlib = 1;

#endif

            break;

        case OPT_BUFSIZE:

            p = opt_arg();

            i = (int)strlen(p) - 1;

            k = i >= 1 && p[i] == 'k';

            if (k)

                p[i] = '\0';

            if (!opt_long(opt_arg(), &n)

                    || n < 0 || (k && n >= LONG_MAX / 1024))

                goto opthelp;

            if (k)

                n *= 1024;

            bsize = (int)n;

            break;

        case OPT_K:

            str = opt_arg();

            break;

        case OPT_KFILE:

            in = bio_open_default(opt_arg(), 'r', FORMAT_TEXT);

            if (in == NULL)

                goto opthelp;

            i = BIO_gets(in, buf, sizeof(buf));

            BIO_free(in);

            in = NULL;

            if (i <= 0) {

                BIO_printf(bio_err,

                           "%s Can't read key from %s\n", prog, opt_arg());

                goto opthelp;

            }

            while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n'))

                buf[i] = '\0';

            if (i <= 0) {

                BIO_printf(bio_err, "%s: zero length password\n", prog);

                goto opthelp;

            }

            str = buf;

            break;

        case OPT_UPPER_K:

            hkey = opt_arg();

            break;

        case OPT_UPPER_S:

            hsalt = opt_arg();

            break;

        case OPT_IV:

            hiv = opt_arg();

            break;

        case OPT_MD:

            if (!opt_md(opt_arg(), &dgst))

                goto opthelp;

            break;

        case OPT_CIPHER:

            if (!opt_cipher(opt_unknown(), &c))

                goto opthelp;

            cipher = c;

            break;

        case OPT_ITER:

            if (!opt_int(opt_arg(), &iter))

                goto opthelp;

            pbkdf2 = 1;

            break;

        case OPT_PBKDF2:

            pbkdf2 = 1;

            if (iter == 0)    /* do not overwrite a chosen value */

                iter = 10000;

            break;

        case OPT_NONE:

            cipher = NULL;

            break;

        case OPT_R_CASES:

            if (!opt_rand(o))

                goto end;

            break;

        }

    }

    if (opt_num_rest() != 0) {

        BIO_printf(bio_err, "Extra arguments given.\n");

        goto opthelp;

    }

    if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {

        BIO_printf(bio_err, "%s: AEAD ciphers not supported\n", prog);

        goto end;

    }

    if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {

        BIO_printf(bio_err, "%s XTS ciphers not supported\n", prog);

        goto end;

    }

    if (dgst == NULL)

        dgst = EVP_sha256();

    if (iter == 0)

        iter = 1;

    /* It must be large enough for a base64 encoded line */

    if (base64 && bsize < 80)

        bsize = 80;

    if (verbose)

        BIO_printf(bio_err, "bufsize=%d\n", bsize);

#ifdef ZLIB

    if (!do_zlib)

#endif

        if (base64) {

            if (enc)

                outformat = FORMAT_BASE64;

            else

                informat = FORMAT_BASE64;

        }

    strbuf = app_malloc(SIZE, "strbuf");

    buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer");

    if (infile == NULL) {

        in = dup_bio_in(informat);

    } else {

        in = bio_open_default(infile, 'r', informat);

    }

    if (in == NULL)

        goto end;

    if (str == NULL && passarg != NULL) {

        if (!app_passwd(passarg, NULL, &pass, NULL)) {

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

            goto end;

        }

        str = pass;

    }

    if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {

        if (1) {

#ifndef OPENSSL_NO_UI_CONSOLE

            for (;;) {

                char prompt[200];

                BIO_snprintf(prompt, sizeof(prompt), "enter %s %s password:",

                        OBJ_nid2ln(EVP_CIPHER_nid(cipher)),

                        (enc) ? "encryption" : "decryption");

                strbuf[0] = '\0';

                i = EVP_read_pw_string((char *)strbuf, SIZE, prompt, 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;

                }

            }

        } else {

#endif

            BIO_printf(bio_err, "password required\n");

            goto end;

        }

    }

    out = bio_open_default(outfile, 'w', outformat);

    if (out == NULL)

        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);

    }

    rbio = in;

    wbio = out;

#ifdef ZLIB

    if (do_zlib) {

        if ((bzl = BIO_new(BIO_f_zlib())) == NULL)

            goto end;

        if (debug) {

            BIO_set_callback(bzl, BIO_debug_callback);

            BIO_set_callback_arg(bzl, (char *)bio_err);

        }

        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;

            size_t str_len = strlen(str);

            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_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;

            }

            if (pbkdf2 == 1) {

                /*

                * 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(cipher);

                int ivlen = EVP_CIPHER_iv_length(cipher);

                /* not needed if HASH_UPDATE() is fixed : */

                int islen = (sptr != NULL ? sizeof(salt) : 0);

                if (!PKCS5_PBKDF2_HMAC(str, str_len, sptr, islen,

                                       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);

            } else {

                BIO_printf(bio_err, "*** WARNING : "

                                    "deprecated key derivation used.\n"

                                    "Using -iter or -pbkdf2 would be better.\n");

                if (!EVP_BytesToKey(cipher, dgst, sptr,

                                    (unsigned char *)str, str_len,

                                    1, key, iv)) {

                    BIO_printf(bio_err, "EVP_BytesToKey failed\n");

                    goto end;

                }

            }

            /*

             * zero the complete buffer or the string passed from the command

             * line.

             */

            if (str == strbuf)

                OPENSSL_cleanse(str, SIZE);

            else

                OPENSSL_cleanse(str, str_len);

        }

        if (hiv != NULL) {

            int siz = EVP_CIPHER_iv_length(cipher);

            if (siz == 0) {

                BIO_printf(bio_err, "warning: iv not used by this cipher\n");

            } else if (!set_hex(hiv, iv, siz)) {

                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.

             * Hence the IV is undefined, making correct decryption impossible.

             */

            BIO_printf(bio_err, "iv undefined\n");

            goto end;

        }

        if (hkey != NULL) {

            if (!set_hex(hkey, key, EVP_CIPHER_key_length(cipher))) {

                BIO_printf(bio_err, "invalid hex key value\n");

                goto end;

            }

            /* wiping secret data as we no longer need it */

            OPENSSL_cleanse(hkey, strlen(hkey));

        }

        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 (EVP_CIPHER_key_length(cipher) > 0) {

                printf("key=");

                for (i = 0; i < EVP_CIPHER_key_length(cipher); i++)

                    printf("%02X", key[i]);

                printf("\n");

            }

            if (EVP_CIPHER_iv_length(cipher) > 0) {

                printf("iv =");

                for (i = 0; i < EVP_CIPHER_iv_length(cipher); 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);

    while (BIO_pending(rbio) || !BIO_eof(rbio)) {

        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   : %8ju\n", BIO_number_read(in));

        BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out));

    }

 end:

    ERR_print_errors(bio_err);

    OPENSSL_free(strbuf);

    OPENSSL_free(buff);

    BIO_free(in);

    BIO_free_all(out);

    BIO_free(benc);

    BIO_free(b64);

#ifdef ZLIB

    BIO_free(bzl);

#endif

    release_engine(e);

    OPENSSL_free(pass);

    return ret;

}

static void show_ciphers(const OBJ_NAME *name, void *arg)

{

    struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg;

    const EVP_CIPHER *cipher;

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

        return;

    /* Filter out ciphers that we cannot use */

    cipher = EVP_get_cipherbyname(name->name);

    if (cipher == NULL ||

            (EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0 ||

            EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)

        return;

    BIO_printf(dec->bio, "-%-25s", name->name);

    if (++dec->n == 3) {

        BIO_printf(dec->bio, "\n");

        dec->n = 0;

    } else

        BIO_printf(dec->bio, " ");

}

static int set_hex(const char *in, unsigned char *out, int size)

{

    int i, n;

    unsigned char j;

    i = size * 2;

    n = strlen(in);

    if (n > i) {

        BIO_printf(bio_err, "hex string is too long, ignoring excess\n");

        n = i; /* ignore exceeding part */

    } else if (n < i) {

        BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n");

    }

    memset(out, 0, size);

    for (i = 0; i < n; i++) {

        j = (unsigned char)*in++;

        if (!isxdigit(j)) {

            BIO_printf(bio_err, "non-hex digit\n");

            return 0;

        }

        j = (unsigned char)OPENSSL_hexchar2int(j);

        if (i & 1)

            out[i / 2] |= j;

        else

            out[i / 2] = (j << 4);

    }

    return 1;

}