573 lines
18 KiB
C
573 lines
18 KiB
C
/*
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* \brief Generic file encryption program using generic wrappers for configured
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* security.
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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/* Enable definition of fileno() even when compiling with -std=c99. Must be
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* set before mbedtls_config.h, which pulls in glibc's features.h indirectly.
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* Harmless on other platforms. */
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#define _POSIX_C_SOURCE 200112L
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#include "mbedtls/build_info.h"
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#include "mbedtls/platform.h"
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#if defined(MBEDTLS_CIPHER_C) && defined(MBEDTLS_MD_C) && \
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defined(MBEDTLS_FS_IO)
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#include "mbedtls/cipher.h"
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#include "mbedtls/md.h"
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#include "mbedtls/platform_util.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#endif
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#if defined(_WIN32)
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#include <windows.h>
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#if !defined(_WIN32_WCE)
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#include <io.h>
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#endif
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#else
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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#define MODE_ENCRYPT 0
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#define MODE_DECRYPT 1
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#define USAGE \
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"\n crypt_and_hash <mode> <input filename> <output filename> <cipher> <mbedtls_md> <key>\n" \
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"\n <mode>: 0 = encrypt, 1 = decrypt\n" \
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"\n example: crypt_and_hash 0 file file.aes AES-128-CBC SHA1 hex:E76B2413958B00E193\n" \
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"\n"
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#if !defined(MBEDTLS_CIPHER_C) || !defined(MBEDTLS_MD_C) || \
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!defined(MBEDTLS_FS_IO)
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int main(void)
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{
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mbedtls_printf("MBEDTLS_CIPHER_C and/or MBEDTLS_MD_C and/or MBEDTLS_FS_IO not defined.\n");
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mbedtls_exit(0);
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}
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#else
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int main(int argc, char *argv[])
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{
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int ret = 1, i;
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unsigned n;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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int mode;
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size_t keylen, ilen, olen;
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FILE *fkey, *fin = NULL, *fout = NULL;
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char *p;
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unsigned char IV[16];
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unsigned char key[512];
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unsigned char digest[MBEDTLS_MD_MAX_SIZE];
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unsigned char buffer[1024];
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unsigned char output[1024];
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unsigned char diff;
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const mbedtls_cipher_info_t *cipher_info;
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const mbedtls_md_info_t *md_info;
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mbedtls_cipher_context_t cipher_ctx;
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mbedtls_md_context_t md_ctx;
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mbedtls_cipher_mode_t cipher_mode;
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unsigned int cipher_block_size;
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unsigned char md_size;
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#if defined(_WIN32_WCE)
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long filesize, offset;
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#elif defined(_WIN32)
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LARGE_INTEGER li_size;
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__int64 filesize, offset;
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#else
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off_t filesize, offset;
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#endif
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mbedtls_cipher_init(&cipher_ctx);
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mbedtls_md_init(&md_ctx);
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/*
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* Parse the command-line arguments.
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*/
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if (argc != 7) {
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const int *list;
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mbedtls_printf(USAGE);
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mbedtls_printf("Available ciphers:\n");
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list = mbedtls_cipher_list();
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while (*list) {
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cipher_info = mbedtls_cipher_info_from_type(*list);
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mbedtls_printf(" %s\n", mbedtls_cipher_info_get_name(cipher_info));
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list++;
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}
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mbedtls_printf("\nAvailable message digests:\n");
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list = mbedtls_md_list();
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while (*list) {
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md_info = mbedtls_md_info_from_type(*list);
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mbedtls_printf(" %s\n", mbedtls_md_get_name(md_info));
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list++;
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}
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goto exit;
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}
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mode = atoi(argv[1]);
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if (mode != MODE_ENCRYPT && mode != MODE_DECRYPT) {
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mbedtls_fprintf(stderr, "invalid operation mode\n");
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goto exit;
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}
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if (strcmp(argv[2], argv[3]) == 0) {
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mbedtls_fprintf(stderr, "input and output filenames must differ\n");
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goto exit;
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}
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if ((fin = fopen(argv[2], "rb")) == NULL) {
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mbedtls_fprintf(stderr, "fopen(%s,rb) failed\n", argv[2]);
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goto exit;
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}
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if ((fout = fopen(argv[3], "wb+")) == NULL) {
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mbedtls_fprintf(stderr, "fopen(%s,wb+) failed\n", argv[3]);
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goto exit;
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}
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/* Ensure no stdio buffering of secrets, as such buffers cannot be wiped. */
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mbedtls_setbuf(fin, NULL);
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mbedtls_setbuf(fout, NULL);
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/*
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* Read the Cipher and MD from the command line
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*/
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cipher_info = mbedtls_cipher_info_from_string(argv[4]);
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if (cipher_info == NULL) {
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mbedtls_fprintf(stderr, "Cipher '%s' not found\n", argv[4]);
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goto exit;
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}
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if ((ret = mbedtls_cipher_setup(&cipher_ctx, cipher_info)) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_setup failed\n");
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goto exit;
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}
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md_info = mbedtls_md_info_from_string(argv[5]);
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if (md_info == NULL) {
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mbedtls_fprintf(stderr, "Message Digest '%s' not found\n", argv[5]);
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goto exit;
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}
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if (mbedtls_md_setup(&md_ctx, md_info, 1) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_setup failed\n");
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goto exit;
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}
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/*
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* Read the secret key from file or command line
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*/
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if ((fkey = fopen(argv[6], "rb")) != NULL) {
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keylen = fread(key, 1, sizeof(key), fkey);
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fclose(fkey);
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} else {
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if (memcmp(argv[6], "hex:", 4) == 0) {
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p = &argv[6][4];
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keylen = 0;
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while (sscanf(p, "%02X", (unsigned int *) &n) > 0 &&
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keylen < (int) sizeof(key)) {
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key[keylen++] = (unsigned char) n;
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p += 2;
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}
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} else {
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keylen = strlen(argv[6]);
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if (keylen > (int) sizeof(key)) {
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keylen = (int) sizeof(key);
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}
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memcpy(key, argv[6], keylen);
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}
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}
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#if defined(_WIN32_WCE)
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filesize = fseek(fin, 0L, SEEK_END);
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#else
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#if defined(_WIN32)
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/*
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* Support large files (> 2Gb) on Win32
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*/
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li_size.QuadPart = 0;
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li_size.LowPart =
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SetFilePointer((HANDLE) _get_osfhandle(_fileno(fin)),
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li_size.LowPart, &li_size.HighPart, FILE_END);
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if (li_size.LowPart == 0xFFFFFFFF && GetLastError() != NO_ERROR) {
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mbedtls_fprintf(stderr, "SetFilePointer(0,FILE_END) failed\n");
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goto exit;
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}
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filesize = li_size.QuadPart;
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#else
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if ((filesize = lseek(fileno(fin), 0, SEEK_END)) < 0) {
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perror("lseek");
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goto exit;
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}
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#endif
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#endif
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if (fseek(fin, 0, SEEK_SET) < 0) {
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mbedtls_fprintf(stderr, "fseek(0,SEEK_SET) failed\n");
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goto exit;
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}
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md_size = mbedtls_md_get_size(md_info);
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cipher_block_size = mbedtls_cipher_get_block_size(&cipher_ctx);
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if (mode == MODE_ENCRYPT) {
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/*
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* Generate the initialization vector as:
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* IV = MD( filesize || filename )[0..15]
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*/
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for (i = 0; i < 8; i++) {
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buffer[i] = (unsigned char) (filesize >> (i << 3));
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}
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p = argv[2];
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if (mbedtls_md_starts(&md_ctx) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_starts() returned error\n");
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goto exit;
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}
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if (mbedtls_md_update(&md_ctx, buffer, 8) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_update() returned error\n");
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goto exit;
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}
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if (mbedtls_md_update(&md_ctx, (unsigned char *) p, strlen(p))
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!= 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_update() returned error\n");
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goto exit;
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}
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if (mbedtls_md_finish(&md_ctx, digest) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_finish() returned error\n");
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goto exit;
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}
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memcpy(IV, digest, 16);
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/*
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* Append the IV at the beginning of the output.
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*/
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if (fwrite(IV, 1, 16, fout) != 16) {
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mbedtls_fprintf(stderr, "fwrite(%d bytes) failed\n", 16);
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goto exit;
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}
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/*
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* Hash the IV and the secret key together 8192 times
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* using the result to setup the AES context and HMAC.
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*/
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memset(digest, 0, 32);
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memcpy(digest, IV, 16);
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for (i = 0; i < 8192; i++) {
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if (mbedtls_md_starts(&md_ctx) != 0) {
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mbedtls_fprintf(stderr,
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"mbedtls_md_starts() returned error\n");
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goto exit;
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}
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if (mbedtls_md_update(&md_ctx, digest, 32) != 0) {
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mbedtls_fprintf(stderr,
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"mbedtls_md_update() returned error\n");
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goto exit;
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}
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if (mbedtls_md_update(&md_ctx, key, keylen) != 0) {
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mbedtls_fprintf(stderr,
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"mbedtls_md_update() returned error\n");
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goto exit;
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}
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if (mbedtls_md_finish(&md_ctx, digest) != 0) {
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mbedtls_fprintf(stderr,
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"mbedtls_md_finish() returned error\n");
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goto exit;
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}
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}
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if (mbedtls_cipher_setkey(&cipher_ctx,
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digest,
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(int) mbedtls_cipher_info_get_key_bitlen(cipher_info),
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MBEDTLS_ENCRYPT) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_setkey() returned error\n");
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goto exit;
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}
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if (mbedtls_cipher_set_iv(&cipher_ctx, IV, 16) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_set_iv() returned error\n");
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goto exit;
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}
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if (mbedtls_cipher_reset(&cipher_ctx) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_reset() returned error\n");
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goto exit;
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}
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if (mbedtls_md_hmac_starts(&md_ctx, digest, 32) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_hmac_starts() returned error\n");
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goto exit;
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}
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/*
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* Encrypt and write the ciphertext.
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*/
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for (offset = 0; offset < filesize; offset += cipher_block_size) {
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ilen = ((unsigned int) filesize - offset > cipher_block_size) ?
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cipher_block_size : (unsigned int) (filesize - offset);
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if (fread(buffer, 1, ilen, fin) != ilen) {
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mbedtls_fprintf(stderr, "fread(%ld bytes) failed\n", (long) ilen);
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goto exit;
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}
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if (mbedtls_cipher_update(&cipher_ctx, buffer, ilen, output, &olen) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_update() returned error\n");
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goto exit;
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}
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if (mbedtls_md_hmac_update(&md_ctx, output, olen) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_hmac_update() returned error\n");
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goto exit;
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}
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if (fwrite(output, 1, olen, fout) != olen) {
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mbedtls_fprintf(stderr, "fwrite(%ld bytes) failed\n", (long) olen);
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goto exit;
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}
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}
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if (mbedtls_cipher_finish(&cipher_ctx, output, &olen) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_finish() returned error\n");
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goto exit;
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}
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if (mbedtls_md_hmac_update(&md_ctx, output, olen) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_hmac_update() returned error\n");
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goto exit;
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}
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if (fwrite(output, 1, olen, fout) != olen) {
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mbedtls_fprintf(stderr, "fwrite(%ld bytes) failed\n", (long) olen);
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goto exit;
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}
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/*
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* Finally write the HMAC.
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*/
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if (mbedtls_md_hmac_finish(&md_ctx, digest) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_hmac_finish() returned error\n");
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goto exit;
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}
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if (fwrite(digest, 1, md_size, fout) != md_size) {
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mbedtls_fprintf(stderr, "fwrite(%d bytes) failed\n", md_size);
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goto exit;
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}
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}
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if (mode == MODE_DECRYPT) {
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/*
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* The encrypted file must be structured as follows:
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*
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* 00 .. 15 Initialization Vector
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* 16 .. 31 Encrypted Block #1
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* ..
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* N*16 .. (N+1)*16 - 1 Encrypted Block #N
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* (N+1)*16 .. (N+1)*16 + n Hash(ciphertext)
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*/
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if (filesize < 16 + md_size) {
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mbedtls_fprintf(stderr, "File too short to be encrypted.\n");
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goto exit;
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}
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if (cipher_block_size == 0) {
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mbedtls_fprintf(stderr, "Invalid cipher block size: 0. \n");
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goto exit;
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}
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/*
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* Check the file size.
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*/
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cipher_mode = mbedtls_cipher_info_get_mode(cipher_info);
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if (cipher_mode != MBEDTLS_MODE_GCM &&
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cipher_mode != MBEDTLS_MODE_CTR &&
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cipher_mode != MBEDTLS_MODE_CFB &&
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cipher_mode != MBEDTLS_MODE_OFB &&
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((filesize - md_size) % cipher_block_size) != 0) {
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mbedtls_fprintf(stderr, "File content not a multiple of the block size (%u).\n",
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cipher_block_size);
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goto exit;
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}
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/*
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* Subtract the IV + HMAC length.
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*/
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filesize -= (16 + md_size);
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/*
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* Read the IV and original filesize modulo 16.
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*/
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if (fread(buffer, 1, 16, fin) != 16) {
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mbedtls_fprintf(stderr, "fread(%d bytes) failed\n", 16);
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goto exit;
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}
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memcpy(IV, buffer, 16);
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/*
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* Hash the IV and the secret key together 8192 times
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* using the result to setup the AES context and HMAC.
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*/
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memset(digest, 0, 32);
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memcpy(digest, IV, 16);
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for (i = 0; i < 8192; i++) {
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if (mbedtls_md_starts(&md_ctx) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_starts() returned error\n");
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goto exit;
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}
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if (mbedtls_md_update(&md_ctx, digest, 32) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_update() returned error\n");
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goto exit;
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}
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if (mbedtls_md_update(&md_ctx, key, keylen) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_update() returned error\n");
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goto exit;
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}
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if (mbedtls_md_finish(&md_ctx, digest) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_finish() returned error\n");
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goto exit;
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}
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}
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if (mbedtls_cipher_setkey(&cipher_ctx,
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digest,
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(int) mbedtls_cipher_info_get_key_bitlen(cipher_info),
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MBEDTLS_DECRYPT) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_setkey() returned error\n");
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goto exit;
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}
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if (mbedtls_cipher_set_iv(&cipher_ctx, IV, 16) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_set_iv() returned error\n");
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goto exit;
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}
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if (mbedtls_cipher_reset(&cipher_ctx) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_cipher_reset() returned error\n");
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goto exit;
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}
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if (mbedtls_md_hmac_starts(&md_ctx, digest, 32) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_hmac_starts() returned error\n");
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goto exit;
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}
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/*
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* Decrypt and write the plaintext.
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*/
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for (offset = 0; offset < filesize; offset += cipher_block_size) {
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ilen = ((unsigned int) filesize - offset > cipher_block_size) ?
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cipher_block_size : (unsigned int) (filesize - offset);
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if (fread(buffer, 1, ilen, fin) != ilen) {
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mbedtls_fprintf(stderr, "fread(%u bytes) failed\n",
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cipher_block_size);
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goto exit;
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}
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if (mbedtls_md_hmac_update(&md_ctx, buffer, ilen) != 0) {
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mbedtls_fprintf(stderr, "mbedtls_md_hmac_update() returned error\n");
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goto exit;
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}
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if (mbedtls_cipher_update(&cipher_ctx, buffer, ilen, output,
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&olen) != 0) {
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|
mbedtls_fprintf(stderr, "mbedtls_cipher_update() returned error\n");
|
|
goto exit;
|
|
}
|
|
|
|
if (fwrite(output, 1, olen, fout) != olen) {
|
|
mbedtls_fprintf(stderr, "fwrite(%ld bytes) failed\n", (long) olen);
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Verify the message authentication code.
|
|
*/
|
|
if (mbedtls_md_hmac_finish(&md_ctx, digest) != 0) {
|
|
mbedtls_fprintf(stderr, "mbedtls_md_hmac_finish() returned error\n");
|
|
goto exit;
|
|
}
|
|
|
|
if (fread(buffer, 1, md_size, fin) != md_size) {
|
|
mbedtls_fprintf(stderr, "fread(%d bytes) failed\n", md_size);
|
|
goto exit;
|
|
}
|
|
|
|
/* Use constant-time buffer comparison */
|
|
diff = 0;
|
|
for (i = 0; i < md_size; i++) {
|
|
diff |= digest[i] ^ buffer[i];
|
|
}
|
|
|
|
if (diff != 0) {
|
|
mbedtls_fprintf(stderr, "HMAC check failed: wrong key, "
|
|
"or file corrupted.\n");
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Write the final block of data
|
|
*/
|
|
if (mbedtls_cipher_finish(&cipher_ctx, output, &olen) != 0) {
|
|
mbedtls_fprintf(stderr, "mbedtls_cipher_finish() returned error\n");
|
|
goto exit;
|
|
}
|
|
|
|
if (fwrite(output, 1, olen, fout) != olen) {
|
|
mbedtls_fprintf(stderr, "fwrite(%ld bytes) failed\n", (long) olen);
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
exit_code = MBEDTLS_EXIT_SUCCESS;
|
|
|
|
exit:
|
|
if (fin) {
|
|
fclose(fin);
|
|
}
|
|
if (fout) {
|
|
fclose(fout);
|
|
}
|
|
|
|
/* Zeroize all command line arguments to also cover
|
|
the case when the user has missed or reordered some,
|
|
in which case the key might not be in argv[6]. */
|
|
for (i = 0; i < argc; i++) {
|
|
mbedtls_platform_zeroize(argv[i], strlen(argv[i]));
|
|
}
|
|
|
|
mbedtls_platform_zeroize(IV, sizeof(IV));
|
|
mbedtls_platform_zeroize(key, sizeof(key));
|
|
mbedtls_platform_zeroize(buffer, sizeof(buffer));
|
|
mbedtls_platform_zeroize(output, sizeof(output));
|
|
mbedtls_platform_zeroize(digest, sizeof(digest));
|
|
|
|
mbedtls_cipher_free(&cipher_ctx);
|
|
mbedtls_md_free(&md_ctx);
|
|
|
|
mbedtls_exit(exit_code);
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_C && MBEDTLS_MD_C && MBEDTLS_FS_IO */
|