2 zip_source_winzip_aes.c -- Winzip AES de/encryption routines
3 Copyright (C) 2009-2016 Dieter Baron and Thomas Klausner
5 This file is part of libzip, a library to manipulate ZIP archives.
6 The authors can be contacted at <libzip@nih.at>
8 Redistribution and use in source and binary forms, with or without
9 modification, are permitted provided that the following conditions
11 1. Redistributions of source code must retain the above copyright
12 notice, this list of conditions and the following disclaimer.
13 2. Redistributions in binary form must reproduce the above copyright
14 notice, this list of conditions and the following disclaimer in
15 the documentation and/or other materials provided with the
17 3. The names of the authors may not be used to endorse or promote
18 products derived from this software without specific prior
21 THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29 IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 #include "gladman-fcrypt.h"
42 #define MAX_HEADER_LENGTH (16+PWD_VER_LENGTH)
43 #define HMAC_LENGTH 10
45 static unsigned int salt_length[] = { 0, 8, 12, 16 };
50 zip_uint16_t encryption_method;
52 zip_uint8_t data[MAX_HEADER_LENGTH];
55 fcrypt_ctx fcrypt_ctx;
61 static int encrypt_header(zip_source_t *src, struct winzip_aes *ctx);
62 static void winzip_aes_free(struct winzip_aes *);
63 static zip_int64_t winzip_aes_encrypt(zip_source_t *src, void *ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd);
64 static struct winzip_aes * winzip_aes_new(unsigned int mode, zip_uint16_t encryption_method, const char *password);
68 zip_source_winzip_aes_encode(zip_t *za, zip_source_t *src, zip_uint16_t encryption_method, int flags, const char *password)
71 unsigned int mode = 0;
72 struct winzip_aes *ctx;
74 switch (encryption_method) {
86 if (password == NULL || src == NULL || mode == 0) {
87 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
91 if (strlen(password) > UINT_MAX) {
92 zip_error_set(&za->error, ZIP_ER_INVAL, 0); /* TODO: better error code? (password too long) */
96 if ((ctx = winzip_aes_new(mode, encryption_method, password)) == NULL) {
97 zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
101 if ((s2 = zip_source_layered(za, src, winzip_aes_encrypt, ctx)) == NULL) {
102 winzip_aes_free(ctx);
111 encrypt_header(zip_source_t *src, struct winzip_aes *ctx)
113 if (!zip_random(ctx->data, (zip_uint16_t)salt_length[ctx->mode])) {
114 zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
118 if (_zip_fcrypt_init(ctx->mode, (unsigned char *)ctx->password, (unsigned int)strlen(ctx->password), ctx->data, ctx->data+salt_length[ctx->mode], &ctx->fcrypt_ctx) != 0) {
119 zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
123 if ((ctx->buffer = _zip_buffer_new(ctx->data, salt_length[ctx->mode] + PWD_VER_LENGTH)) == NULL) {
124 zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
133 winzip_aes_encrypt(zip_source_t *src, void *ud, void *data, zip_uint64_t length, zip_source_cmd_t cmd)
135 struct winzip_aes *ctx;
137 zip_uint64_t buffer_n, offset, n;
139 ctx = (struct winzip_aes *)ud;
142 case ZIP_SOURCE_OPEN:
144 if (encrypt_header(src, ctx) < 0) {
149 case ZIP_SOURCE_READ:
153 buffer_n = _zip_buffer_read(ctx->buffer, data, length);
155 data = (zip_uint8_t *)data + buffer_n;
158 if (_zip_buffer_eof(ctx->buffer)) {
159 _zip_buffer_free(ctx->buffer);
165 return (zip_int64_t)buffer_n;
168 if ((ret = zip_source_read(src, data, length)) < 0) {
169 _zip_error_set_from_source(&ctx->error, src);
173 n = (zip_uint64_t)ret;
174 for (offset = 0; offset < n; offset += ZIP_MIN(n - offset, UINT_MAX)) {
175 _zip_fcrypt_encrypt((zip_uint8_t *)data + offset, (unsigned int)ZIP_MIN(n - offset, UINT_MAX), &ctx->fcrypt_ctx);
180 _zip_fcrypt_end(ctx->data, &ctx->fcrypt_ctx);
181 if ((ctx->buffer = _zip_buffer_new(ctx->data, HMAC_LENGTH)) == NULL) {
182 zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
183 /* TODO: return partial read? */
188 return (zip_int64_t)(buffer_n + n);
190 case ZIP_SOURCE_CLOSE:
193 case ZIP_SOURCE_STAT:
197 st = (zip_stat_t *)data;
198 st->encryption_method = ctx->encryption_method;
199 st->valid |= ZIP_STAT_ENCRYPTION_METHOD;
200 if (st->valid & ZIP_STAT_COMP_SIZE) {
201 st->comp_size += 12 + salt_length[ctx->mode];
207 case ZIP_SOURCE_SUPPORTS:
208 return zip_source_make_command_bitmap(ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_CLOSE, ZIP_SOURCE_STAT, ZIP_SOURCE_ERROR, ZIP_SOURCE_FREE, -1);
210 case ZIP_SOURCE_ERROR:
211 return zip_error_to_data(&ctx->error, data, length);
213 case ZIP_SOURCE_FREE:
214 winzip_aes_free(ctx);
218 zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
225 winzip_aes_free(struct winzip_aes *ctx)
231 _zip_crypto_clear(&ctx->fcrypt_ctx, sizeof(ctx->fcrypt_ctx));
232 _zip_crypto_clear(ctx->password, strlen(ctx->password));
234 zip_error_fini(&ctx->error);
235 _zip_buffer_free(ctx->buffer);
240 static struct winzip_aes *
241 winzip_aes_new(unsigned int mode, zip_uint16_t encryption_method, const char *password) {
242 struct winzip_aes *ctx;
244 if ((ctx = (struct winzip_aes *)malloc(sizeof(*ctx))) == NULL) {
248 if ((ctx->password = strdup(password)) == NULL) {
254 ctx->encryption_method = encryption_method;
257 zip_error_init(&ctx->error);