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openssl/apps/enc.c
Matt Caswell 05200ee5c6 Change usage of RAND_pseudo_bytes to RAND_bytes 
RAND_pseudo_bytes() allows random data to be returned even in low entropy
conditions. Sometimes this is ok. Many times it is not. For the avoidance
of any doubt, replace existing usage of RAND_pseudo_bytes() with
RAND_bytes().

Reviewed-by: Rich Salz <rsalz@openssl.org>
2016-06-27 15:02:34 +01:00

716 lines
23 KiB
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>
#ifndef OPENSSL_NO_COMP
# include <openssl/comp.h>
#endif
#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;
int non_fips_allow = 0;
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 (strcmp(*argv, "-non-fips-allow") == 0)
non_fips_allow = 1;
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 (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
BIO_printf(bio_err,
"AEAD ciphers not supported by the enc utility\n");
goto end;
}
if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {
BIO_printf(bio_err,
"Ciphers in XTS mode are not supported by the enc utility\n");
goto end;
}
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_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) {
int siz = EVP_CIPHER_iv_length(cipher);
if (siz == 0) {
BIO_printf(bio_err, "warning: iv not use by this cipher\n");
} else if (!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, EVP_CIPHER_key_length(cipher))) {
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 (non_fips_allow)
EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPH_FLAG_NON_FIPS_ALLOW);
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);
}
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