path: root/usr.bin/openssl/enc.c

/* $OpenBSD: enc.c,v 1.3 2014/10/22 13:54:03 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)
#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 enc_main(int, char **);

int
enc_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;

	/* 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);
				fclose(infile);
				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 ((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 (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 = 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 (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) {
		if (bufsize != NULL)
			setvbuf(stdin, (char *) NULL, _IONBF, 0);
		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];
			int retval;

			retval = snprintf(buf, sizeof buf, "enter %s %s password:",
			    OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
			    (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);
			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);
		if (bufsize != NULL)
			setvbuf(stdout, (char *) NULL, _IONBF, 0);
	} 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
						arc4random_buf(salt,
						    sizeof(salt));
					/*
					 * 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)
		    && 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, 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, (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);
	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);
}