again [PATCH v1 2/2] command ccrypt
Gerd Pauli
gp at high-consulting.de
Mon Oct 9 01:26:16 PDT 2017
There was a bug in the last mail i sent. [PATCH v1 2/2] command ccrypt
This is the fix. Sorry for the dust :-)
Crypt and decrypt files using passwords in keystore.
Needs ccryptlib and keystore
Usage: ccrypt [-e|-d] -k KEYNAME_IN_KEYSTORE SRC DST
Signed-off-by: Gerd Pauli <gp at high-consulting.de>
---
commands/Kconfig | 10 +++
commands/Makefile | 1 +
commands/ccrypt.c | 228 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 239 insertions(+)
create mode 100644 commands/ccrypt.c
diff --git a/commands/Kconfig b/commands/Kconfig
index af2b215..2d53860 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -2138,6 +2138,16 @@ config CMD_SEED
help
Seed the pseudo random number generator (PRNG)
+config CMD_CCRYPT
+ tristate
+ prompt "ccrypt"
+ select CCRYPTLIB
+ select CRYPTO_KEYSTORE
+ help
+ encrypting/decrypting a character stream
+ ccrypt implements a stream cipher based on the block cipher
+ Rijndael, the candidate for the AES standard.
+
# end Miscellaneous commands
endmenu
diff --git a/commands/Makefile b/commands/Makefile
index 16c1768..b40eeb1 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -124,3 +124,4 @@ obj-$(CONFIG_CMD_SPD_DECODE) += spd_decode.o
obj-$(CONFIG_CMD_MMC_EXTCSD) += mmc_extcsd.o
obj-$(CONFIG_CMD_NAND_BITFLIP) += nand-bitflip.o
obj-$(CONFIG_CMD_SEED) += seed.o
+obj-$(CONFIG_CMD_CCRYPT) += ccrypt.o
diff --git a/commands/ccrypt.c b/commands/ccrypt.c
new file mode 100644
index 0000000..ad0158c
--- /dev/null
+++ b/commands/ccrypt.c
@@ -0,0 +1,228 @@
+/* -*- Mode:C; c-file-style:"linux"; -*- */
+
+/*
+ * ccrypt.c - Crypt and Decrypt Files using Password in Keystore
+ * uses ccryptlib
+ *
+ * Copyright (C) 2015 Alexander Smirnov <alllecs at yandex.ru>
+ * Copyright (c) 2017 Gerd Pauli <gp at high-consulting.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <libfile.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <fs.h>
+#include <ccryptlib.h>
+#include <crypto/keystore.h>
+
+#define INBUFSIZE 1024
+#define OUTBUFSIZE (INBUFSIZE + 32)
+
+static void ccrypt_error(int e)
+{
+ if (e == -1) {
+ printf("ccrypt: %s\n", strerror(errno));
+ return;
+ }
+ if (e == -2) {
+ switch (ccrypt_errno) {
+ case CCRYPT_EFORMAT:
+ printf("ccrypt: %s\n", "bad file format");
+ break;
+ case CCRYPT_EMISMATCH:
+ printf("ccrypt: %s\n", "key does not match");
+ break;
+ case CCRYPT_EBUFFER:
+ printf("ccrypt: %s\n", "buffer overflow");
+ break;
+ default:
+ /* do nothing */
+ printf("ccrypt: %s\n", "unknown error");
+ break;
+ }
+ return;
+ }
+ printf("ccrypt: %s\n", "unknown error");
+}
+
+static int do_ccrypt(int argc, char *argv[])
+{
+ int opt;
+ int ret = -EINVAL;
+ int encrypt = 0;
+ int decrypt = 0;
+ char *extract = NULL;
+ char *from = NULL;
+ char *to = NULL;
+ char *r_buf = NULL;
+ char *w_buf = NULL;
+ int from_fd = 0;
+ int to_fd = 0;
+ int r, w;
+ void *buf;
+ struct ccrypt_stream_s ccs;
+ struct ccrypt_stream_s *b = &ccs;
+ int flags = 0;
+ char *key;
+ int keylen;
+ int eof = 0;
+
+ while ((opt = getopt(argc, argv, "dek:")) > 0) {
+ switch (opt) {
+ case 'e':
+ encrypt = 1;
+ break;
+ case 'd':
+ decrypt = 1;
+ break;
+ case 'k':
+ extract = optarg;
+ break;
+ default:
+ break;
+ }
+ }
+ if (encrypt == 1 && decrypt == 1)
+ return ret;
+ if (extract == NULL)
+ return ret;
+
+ /* we need 2 non-option arguments */
+ if (argc - optind != 2)
+ return ret;
+
+ from = argv[optind];
+ to = argv[optind + 1];
+
+ r_buf = xmalloc(INBUFSIZE);
+ w_buf = xmalloc(OUTBUFSIZE);
+
+ ret = keystore_get_secret(extract, (const u8 **)&key, &keylen);
+ if (ret)
+ goto out;
+
+ from_fd = open(from, O_RDONLY);
+ if (from_fd < 0) {
+ printf("could not open %s: %s\n", from, errno_str());
+ ret = errno;
+ goto out;
+ }
+
+ to_fd = open(to, O_WRONLY | O_CREAT | O_TRUNC);
+ if (to_fd < 0) {
+ printf("could not open %s: %s\n", to, errno_str());
+ ret = errno;
+ goto out;
+ }
+
+ ret = 0;
+
+ if (encrypt == 1)
+ ret = ccencrypt_init(b, key);
+
+ if (decrypt == 1)
+ ret = ccdecrypt_init(b, key, flags);
+
+ if (ret != 0) {
+ ccrypt_error(ret);
+ ret = 1;
+ goto out;
+ }
+
+ b->avail_in = 0;
+
+ while (1) {
+ /* fill input buffer */
+ if (b->avail_in == 0 && !eof) {
+ r = read(from_fd, r_buf, INBUFSIZE);
+ if (r < 0) {
+ perror("read");
+ goto out;
+ }
+ if (!r)
+ eof = 1;
+ b->next_in = &r_buf[0];
+ b->avail_in = r;
+ }
+
+ /* prepare output buffer */
+ b->next_out = &w_buf[0];
+ b->avail_out = OUTBUFSIZE;
+
+ if (encrypt == 1) {
+ ret = ccencrypt(b);
+ if (ret) {
+ ccrypt_error(-2);
+ ccencrypt_end(b);
+ ret = 1;
+ goto out;
+ }
+ }
+ if (decrypt == 1) {
+ ret = ccdecrypt(b);
+ if (ret) {
+ ccrypt_error(-2);
+ ccdecrypt_end(b);
+ ret = 1;
+ goto out;
+ }
+ }
+
+ r = OUTBUFSIZE-b->avail_out;
+ buf = &w_buf[0];
+
+
+ /* process output buffer */
+ while (r) {
+ w = write(to_fd, buf, r);
+ if (w < 0) {
+ perror("write");
+ goto out;
+ }
+ buf += w;
+ r -= w;
+ }
+
+ if (eof && b->avail_out != 0)
+ break;
+ }
+ ret = 0;
+out:
+ free(r_buf);
+ free(w_buf);
+ if (from_fd > 0)
+ close(from_fd);
+ if (to_fd > 0)
+ close(to_fd);
+
+ return ret;
+}
+
+BAREBOX_CMD_HELP_START(ccrypt)
+BAREBOX_CMD_HELP_TEXT("Rijandel Crypt and Decrypt")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT("-e", "encrypt")
+BAREBOX_CMD_HELP_OPT("-d", "decrypt")
+BAREBOX_CMD_HELP_OPT("-k name", "Name of key in keystore")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(ccrypt)
+.cmd = do_ccrypt,
+ BAREBOX_CMD_DESC("Crypt and Decrypt Files")
+ BAREBOX_CMD_OPTS("[-e|-d] -k NAME SRC DST")
+ BAREBOX_CMD_HELP(cmd_ccrypt_help)
+ BAREBOX_CMD_END
--
1.9.1
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