File: [local] / src / usr.bin / openssl / enc.c (download)
Revision 1.5, Sat Aug 22 16:36:05 2015 UTC (8 years, 9 months ago) by jsing
Branch: MAIN
Changes since 1.4: +1 -3 lines
Remove all duplicate prototypes for *_main functions (these are already
provided by progs.h). Also, move the FUNCTION type (and flags) into
openssl.c since that is the only place of use. Lastly, remove pointless
'extern' from the prototypes and use char **argv instead of char *argv[]
(the former is used elsewhere).
ok deraadt@ doug@
|
/* $OpenBSD: enc.c,v 1.5 2015/08/22 16:36:05 jsing 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 <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/comp.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/pem.h>
#include <openssl/x509.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;
#ifdef ZLIB
int do_zlib;
#endif
int enc;
#ifndef OPENSSL_NO_ENGINE
char *engine;
#endif
char *hiv;
char *hkey;
char *hsalt;
char *inf;
char *keyfile;
char *keystr;
char *md;
int nopad;
int nosalt;
int olb64;
char *outf;
char *passarg;
int printkey;
int verbose;
} enc_config;
static int
enc_opt_cipher(int argc, char **argv, int *argsused)
{
char *name = argv[0];
if (*name++ != '-')
return (1);
if (strcmp(name, "none") == 0) {
enc_config.cipher = NULL;
*argsused = 1;
return (0);
}
if ((enc_config.cipher = EVP_get_cipherbyname(name)) != NULL) {
*argsused = 1;
return (0);
}
return (1);
}
static struct option enc_options[] = {
{
.name = "A",
.desc = "Process base64 data on one line (requires -a)",
.type = OPTION_FLAG,
.opt.flag = &enc_config.olb64,
},
{
.name = "a",
.desc = "Perform base64 encoding/decoding (alias -base64)",
.type = OPTION_FLAG,
.opt.flag = &enc_config.base64,
},
{
.name = "base64",
.type = OPTION_FLAG,
.opt.flag = &enc_config.base64,
},
{
.name = "bufsize",
.argname = "size",
.desc = "Specify the buffer size to use for I/O",
.type = OPTION_ARG,
.opt.arg = &enc_config.bufsize,
},
{
.name = "d",
.desc = "Decrypt the input data",
.type = OPTION_VALUE,
.opt.value = &enc_config.enc,
.value = 0,
},
{
.name = "debug",
.desc = "Print debugging information",
.type = OPTION_FLAG,
.opt.flag = &enc_config.debug,
},
{
.name = "e",
.desc = "Encrypt the input data (default)",
.type = OPTION_VALUE,
.opt.value = &enc_config.enc,
.value = 1,
},
#ifndef OPENSSL_NO_ENGINE
{
.name = "engine",
.argname = "id",
.desc = "Use the engine specified by the given identifier",
.type = OPTION_ARG,
.opt.arg = &enc_config.engine,
},
#endif
{
.name = "in",
.argname = "file",
.desc = "Input file to read from (default stdin)",
.type = OPTION_ARG,
.opt.arg = &enc_config.inf,
},
{
.name = "iv",
.argname = "IV",
.desc = "IV to use, specified as a hexidecimal string",
.type = OPTION_ARG,
.opt.arg = &enc_config.hiv,
},
{
.name = "K",
.argname = "key",
.desc = "Key to use, specified as a hexidecimal string",
.type = OPTION_ARG,
.opt.arg = &enc_config.hkey,
},
{
.name = "k", /* Superseded by -pass. */
.type = OPTION_ARG,
.opt.arg = &enc_config.keystr,
},
{
.name = "kfile", /* Superseded by -pass. */
.type = OPTION_ARG,
.opt.arg = &enc_config.keyfile,
},
{
.name = "md",
.argname = "digest",
.desc = "Digest to use to create a key from the passphrase",
.type = OPTION_ARG,
.opt.arg = &enc_config.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 = &enc_config.nopad,
},
{
.name = "nosalt",
.type = OPTION_VALUE,
.opt.value = &enc_config.nosalt,
.value = 1,
},
{
.name = "out",
.argname = "file",
.desc = "Output file to write to (default stdout)",
.type = OPTION_ARG,
.opt.arg = &enc_config.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 = &enc_config.printkey,
.value = 2,
},
{
.name = "p",
.desc = "Print out the salt, key and IV used",
.type = OPTION_VALUE,
.opt.value = &enc_config.printkey,
.value = 1,
},
{
.name = "pass",
.argname = "source",
.desc = "Password source",
.type = OPTION_ARG,
.opt.arg = &enc_config.passarg,
},
{
.name = "S",
.argname = "salt",
.desc = "Salt to use, specified as a hexidecimal string",
.type = OPTION_ARG,
.opt.arg = &enc_config.hsalt,
},
{
.name = "salt",
.desc = "Use a salt in the key derivation routines (default)",
.type = OPTION_VALUE,
.opt.value = &enc_config.nosalt,
.value = 0,
},
{
.name = "v",
.desc = "Verbose",
.type = OPTION_FLAG,
.opt.flag = &enc_config.verbose,
},
#ifdef ZLIB
{
.name = "z",
.desc = "Perform zlib compression/decompression",
.type = OPTION_FLAG,
.opt.flag = &enc_config.do_zlib,
},
#endif
{
.name = NULL,
.type = OPTION_ARGV_FUNC,
.opt.argvfunc = enc_opt_cipher,
},
{ NULL },
};
static void
show_ciphers(const OBJ_NAME *name, void *arg)
{
static int n;
if (!islower((unsigned char)*name->name))
return;
fprintf(stderr, " -%-24s%s", name->name, (++n % 3 ? "" : "\n"));
}
static void
enc_usage(void)
{
fprintf(stderr, "usage: enc -ciphername [-AadePp] [-base64] "
"[-bufsize number] [-debug]\n"
" [-engine id] [-in file] [-iv IV] [-K key] [-k password]\n"
" [-kfile file] [-md digest] [-none] [-nopad] [-nosalt]\n"
" [-out file] [-pass arg] [-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, show_ciphers, NULL);
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];
#ifdef ZLIB
BIO *bzl = NULL;
#endif
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;
memset(&enc_config, 0, sizeof(enc_config));
enc_config.enc = 1;
/* first check the program name */
program_name(argv[0], pname, sizeof(pname));
if (strcmp(pname, "base64") == 0)
enc_config.base64 = 1;
#ifdef ZLIB
if (strcmp(pname, "zlib") == 0)
enc_config.do_zlib = 1;
#endif
enc_config.cipher = EVP_get_cipherbyname(pname);
#ifdef ZLIB
if (!enc_config.do_zlib && !enc_config.base64 &&
enc_config.cipher == NULL && strcmp(pname, "enc") != 0)
#else
if (!enc_config.base64 && enc_config.cipher == NULL &&
strcmp(pname, "enc") != 0)
#endif
{
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 (enc_config.keyfile != NULL) {
static char buf[128];
FILE *infile;
infile = fopen(enc_config.keyfile, "r");
if (infile == NULL) {
BIO_printf(bio_err, "unable to read key from '%s'\n",
enc_config.keyfile);
goto end;
}
buf[0] = '\0';
if (!fgets(buf, sizeof buf, infile)) {
BIO_printf(bio_err, "unable to read key from '%s'\n",
enc_config.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;
}
enc_config.keystr = buf;
}
#ifndef OPENSSL_NO_ENGINE
setup_engine(bio_err, enc_config.engine, 0);
#endif
if (enc_config.md != NULL &&
(dgst = EVP_get_digestbyname(enc_config.md)) == NULL) {
BIO_printf(bio_err,
"%s is an unsupported message digest type\n",
enc_config.md);
goto end;
}
if (dgst == NULL) {
dgst = EVP_md5(); /* XXX */
}
if (enc_config.bufsize != NULL) {
char *p = enc_config.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 (enc_config.base64 && n < 80)
n = 80;
bsize = (int)n;
if (enc_config.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 (enc_config.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 (enc_config.inf == NULL) {
if (enc_config.bufsize != NULL)
setvbuf(stdin, (char *) NULL, _IONBF, 0);
BIO_set_fp(in, stdin, BIO_NOCLOSE);
} else {
if (BIO_read_filename(in, enc_config.inf) <= 0) {
perror(enc_config.inf);
goto end;
}
}
if (!enc_config.keystr && enc_config.passarg) {
if (!app_passwd(bio_err, enc_config.passarg, NULL,
&pass, NULL)) {
BIO_printf(bio_err, "Error getting password\n");
goto end;
}
enc_config.keystr = pass;
}
if (enc_config.keystr == NULL && enc_config.cipher != NULL &&
enc_config.hkey == NULL) {
for (;;) {
char buf[200];
int retval;
retval = snprintf(buf, sizeof buf,
"enter %s %s password:",
OBJ_nid2ln(EVP_CIPHER_nid(enc_config.cipher)),
enc_config.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,
enc_config.enc);
if (i == 0) {
if (strbuf[0] == '\0') {
ret = 1;
goto end;
}
enc_config.keystr = strbuf;
break;
}
if (i < 0) {
BIO_printf(bio_err, "bad password read\n");
goto end;
}
}
}
if (enc_config.outf == NULL) {
BIO_set_fp(out, stdout, BIO_NOCLOSE);
if (enc_config.bufsize != NULL)
setvbuf(stdout, (char *)NULL, _IONBF, 0);
} else {
if (BIO_write_filename(out, enc_config.outf) <= 0) {
perror(enc_config.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 (enc_config.base64) {
if ((b64 = BIO_new(BIO_f_base64())) == NULL)
goto end;
if (enc_config.debug) {
BIO_set_callback(b64, BIO_debug_callback);
BIO_set_callback_arg(b64, (char *) bio_err);
}
if (enc_config.olb64)
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
if (enc_config.enc)
wbio = BIO_push(b64, wbio);
else
rbio = BIO_push(b64, rbio);
}
if (enc_config.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 (enc_config.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 (enc_config.nosalt)
sptr = NULL;
else {
if (enc_config.enc) {
if (enc_config.hsalt) {
if (!set_hex(enc_config.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 ((enc_config.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(enc_config.cipher, dgst, sptr,
(unsigned char *)enc_config.keystr,
strlen(enc_config.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 (enc_config.keystr == strbuf)
OPENSSL_cleanse(enc_config.keystr, SIZE);
else
OPENSSL_cleanse(enc_config.keystr,
strlen(enc_config.keystr));
}
if (enc_config.hiv != NULL &&
!set_hex(enc_config.hiv, iv, sizeof iv)) {
BIO_printf(bio_err, "invalid hex iv value\n");
goto end;
}
if (enc_config.hiv == NULL && enc_config.keystr == NULL &&
EVP_CIPHER_iv_length(enc_config.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 (enc_config.hkey != NULL &&
!set_hex(enc_config.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, enc_config.cipher, NULL, NULL,
NULL, enc_config.enc)) {
BIO_printf(bio_err, "Error setting cipher %s\n",
EVP_CIPHER_name(enc_config.cipher));
ERR_print_errors(bio_err);
goto end;
}
if (enc_config.nopad)
EVP_CIPHER_CTX_set_padding(ctx, 0);
if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv,
enc_config.enc)) {
BIO_printf(bio_err, "Error setting cipher %s\n",
EVP_CIPHER_name(enc_config.cipher));
ERR_print_errors(bio_err);
goto end;
}
if (enc_config.debug) {
BIO_set_callback(benc, BIO_debug_callback);
BIO_set_callback_arg(benc, (char *) bio_err);
}
if (enc_config.printkey) {
if (!enc_config.nosalt) {
printf("salt=");
for (i = 0; i < (int) sizeof(salt); i++)
printf("%02X", salt[i]);
printf("\n");
}
if (enc_config.cipher->key_len > 0) {
printf("key=");
for (i = 0; i < enc_config.cipher->key_len; i++)
printf("%02X", key[i]);
printf("\n");
}
if (enc_config.cipher->iv_len > 0) {
printf("iv =");
for (i = 0; i < enc_config.cipher->iv_len; i++)
printf("%02X", iv[i]);
printf("\n");
}
if (enc_config.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 (enc_config.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);
if (out != NULL)
BIO_free_all(out);
BIO_free(benc);
BIO_free(b64);
#ifdef ZLIB
BIO_free(bzl);
#endif
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);
}
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