/src/libzip/lib/zip_source_winzip_aes_encode.c

Source
/*
  zip_source_winzip_aes_encode.c -- Winzip AES encryption routines
  Copyright (C) 2009-2023 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <info@libzip.org>

  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 above 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. The names of the authors may not be used to endorse or promote
  products derived from this software without specific prior
  written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
*/


#include <stdlib.h>
#include <string.h>

#include "zipint.h"
#include "zip_crypto.h"

struct winzip_aes {
    char *password;
    zip_uint16_t encryption_method;

    zip_uint8_t data[ZIP_MAX(WINZIP_AES_MAX_HEADER_LENGTH, ZIP_CRYPTO_SHA1_LENGTH)];
    zip_buffer_t *buffer;

    zip_winzip_aes_t *aes_ctx;
    bool eof;
    zip_error_t error;
};


static int encrypt_header(zip_source_t *src, struct winzip_aes *ctx);
static void winzip_aes_free(struct winzip_aes *);
static zip_int64_t winzip_aes_encrypt(zip_source_t *src, void *ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd);
static struct winzip_aes *winzip_aes_new(zip_uint16_t encryption_method, const char *password, zip_error_t *error);


zip_source_t *
zip_source_winzip_aes_encode(zip_t *za, zip_source_t *src, zip_uint16_t encryption_method, int flags, const char *password) {
    zip_source_t *s2;
    struct winzip_aes *ctx;

    if ((encryption_method != ZIP_EM_AES_128 && encryption_method != ZIP_EM_AES_192 && encryption_method != ZIP_EM_AES_256) || password == NULL || src == NULL) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return NULL;
    }

    if ((ctx = winzip_aes_new(encryption_method, password, &za->error)) == NULL) {
        return NULL;
    }

    if ((s2 = zip_source_layered(za, src, winzip_aes_encrypt, ctx)) == NULL) {
        winzip_aes_free(ctx);
        return NULL;
    }

    return s2;
}


static int
encrypt_header(zip_source_t *src, struct winzip_aes *ctx) {
    zip_uint16_t salt_length = SALT_LENGTH(ctx->encryption_method);
    if (!zip_secure_random(ctx->data, salt_length)) {
        zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
        return -1;
    }

    if ((ctx->aes_ctx = _zip_winzip_aes_new((zip_uint8_t *)ctx->password, strlen(ctx->password), ctx->data, ctx->encryption_method, ctx->data + salt_length, &ctx->error)) == NULL) {
        return -1;
    }

    if ((ctx->buffer = _zip_buffer_new(ctx->data, salt_length + WINZIP_AES_PASSWORD_VERIFY_LENGTH)) == NULL) {
        _zip_winzip_aes_free(ctx->aes_ctx);
        ctx->aes_ctx = NULL;
        zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
        return -1;
    }

    return 0;
}


static zip_int64_t
winzip_aes_encrypt(zip_source_t *src, void *ud, void *data, zip_uint64_t length, zip_source_cmd_t cmd) {
    struct winzip_aes *ctx;
    zip_int64_t ret;
    zip_uint64_t buffer_n;

    ctx = (struct winzip_aes *)ud;

    switch (cmd) {
    case ZIP_SOURCE_OPEN:
        ctx->eof = false;
        if (encrypt_header(src, ctx) < 0) {
            return -1;
        }
        return 0;

    case ZIP_SOURCE_READ:
        buffer_n = 0;

        if (ctx->buffer) {
            buffer_n = _zip_buffer_read(ctx->buffer, data, length);

            data = (zip_uint8_t *)data + buffer_n;
            length -= buffer_n;

            if (_zip_buffer_eof(ctx->buffer)) {
                _zip_buffer_free(ctx->buffer);
                ctx->buffer = NULL;
            }
        }

        if (ctx->eof) {
            return (zip_int64_t)buffer_n;
        }

        if ((ret = zip_source_read(src, data, length)) < 0) {
            zip_error_set_from_source(&ctx->error, src);
            return -1;
        }

        if (!_zip_winzip_aes_encrypt(ctx->aes_ctx, data, (zip_uint64_t)ret)) {
            zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
            /* TODO: return partial read? */
            return -1;
        }

        if ((zip_uint64_t)ret < length) {
            ctx->eof = true;
            if (!_zip_winzip_aes_finish(ctx->aes_ctx, ctx->data)) {
                zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
                /* TODO: return partial read? */
                return -1;
            }
            _zip_winzip_aes_free(ctx->aes_ctx);
            ctx->aes_ctx = NULL;
            if ((ctx->buffer = _zip_buffer_new(ctx->data, HMAC_LENGTH)) == NULL) {
                zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
                /* TODO: return partial read? */
                return -1;
            }
            buffer_n += _zip_buffer_read(ctx->buffer, (zip_uint8_t *)data + ret, length - (zip_uint64_t)ret);
        }

        return (zip_int64_t)(buffer_n + (zip_uint64_t)ret);

    case ZIP_SOURCE_CLOSE:
        return 0;

    case ZIP_SOURCE_STAT: {
        zip_stat_t *st;

        st = (zip_stat_t *)data;
        st->encryption_method = ctx->encryption_method;
        st->valid |= ZIP_STAT_ENCRYPTION_METHOD;
        if (st->valid & ZIP_STAT_COMP_SIZE) {
            st->comp_size += 12 + SALT_LENGTH(ctx->encryption_method);
        }

        return 0;
    }

    case ZIP_SOURCE_GET_FILE_ATTRIBUTES: {
        zip_file_attributes_t *attributes = (zip_file_attributes_t *)data;
        if (length < sizeof(*attributes)) {
            zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
            return -1;
        }
        attributes->valid |= ZIP_FILE_ATTRIBUTES_VERSION_NEEDED;
        attributes->version_needed = 51;

        return 0;
    }

    case ZIP_SOURCE_SUPPORTS:
        return zip_source_make_command_bitmap(ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_CLOSE, ZIP_SOURCE_STAT, ZIP_SOURCE_ERROR, ZIP_SOURCE_FREE, ZIP_SOURCE_GET_FILE_ATTRIBUTES, -1);

    case ZIP_SOURCE_ERROR:
        return zip_error_to_data(&ctx->error, data, length);

    case ZIP_SOURCE_FREE:
        winzip_aes_free(ctx);
        return 0;

    default:
        return zip_source_pass_to_lower_layer(src, data, length, cmd);
    }
}


static void
winzip_aes_free(struct winzip_aes *ctx) {
    if (ctx == NULL) {
        return;
    }

    _zip_crypto_clear(ctx->password, strlen(ctx->password));
    free(ctx->password);
    zip_error_fini(&ctx->error);
    _zip_buffer_free(ctx->buffer);
    _zip_winzip_aes_free(ctx->aes_ctx);
    free(ctx);
}


static struct winzip_aes *
winzip_aes_new(zip_uint16_t encryption_method, const char *password, zip_error_t *error) {
    struct winzip_aes *ctx;

    if ((ctx = (struct winzip_aes *)malloc(sizeof(*ctx))) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }

    if ((ctx->password = strdup(password)) == NULL) {
        free(ctx);
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }

    ctx->encryption_method = encryption_method;
    ctx->buffer = NULL;
    ctx->aes_ctx = NULL;

    zip_error_init(&ctx->error);

    ctx->eof = false;
    return ctx;
}

Coverage Report

Created: 2025-12-14 07:01

Line	Count	Source
1		/*
2		zip_source_winzip_aes_encode.c -- Winzip AES encryption routines
3		Copyright (C) 2009-2023 Dieter Baron and Thomas Klausner
4
5		This file is part of libzip, a library to manipulate ZIP archives.
6		The authors can be contacted at <info@libzip.org>
7
8		Redistribution and use in source and binary forms, with or without
9		modification, are permitted provided that the following conditions
10		are met:
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
16		distribution.
17		3. The names of the authors may not be used to endorse or promote
18		products derived from this software without specific prior
19		written permission.
20
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.
32		*/
33
34
35		#include <stdlib.h>
36		#include <string.h>
37
38		#include "zipint.h"
39		#include "zip_crypto.h"
40
41		struct winzip_aes {
42		char *password;
43		zip_uint16_t encryption_method;
44
45		zip_uint8_t data[ZIP_MAX(WINZIP_AES_MAX_HEADER_LENGTH, ZIP_CRYPTO_SHA1_LENGTH)];
46		zip_buffer_t *buffer;
47
48		zip_winzip_aes_t *aes_ctx;
49		bool eof;
50		zip_error_t error;
51		};
52
53
54		static int encrypt_header(zip_source_t src, struct winzip_aes ctx);
55		static void winzip_aes_free(struct winzip_aes *);
56		static zip_int64_t winzip_aes_encrypt(zip_source_t src, void ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd);
57		static struct winzip_aes winzip_aes_new(zip_uint16_t encryption_method, const char password, zip_error_t *error);
58
59
60		zip_source_t *
61	476	zip_source_winzip_aes_encode(zip_t za, zip_source_t src, zip_uint16_t encryption_method, int flags, const char *password) {
62	476	zip_source_t *s2;
63	476	struct winzip_aes *ctx;
64
65	476	if ((encryption_method != ZIP_EM_AES_128 && encryption_method != ZIP_EM_AES_192 && encryption_method != ZIP_EM_AES_256) \|\| password == NULL \|\| src == NULL) {
66	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
67	0	return NULL;
68	0	}
69
70	476	if ((ctx = winzip_aes_new(encryption_method, password, &za->error)) == NULL) {
71	0	return NULL;
72	0	}
73
74	476	if ((s2 = zip_source_layered(za, src, winzip_aes_encrypt, ctx)) == NULL) {
75	0	winzip_aes_free(ctx);
76	0	return NULL;
77	0	}
78
79	476	return s2;
80	476	}
81
82
83		static int
84	476	encrypt_header(zip_source_t src, struct winzip_aes ctx) {
85	476	zip_uint16_t salt_length = SALT_LENGTH(ctx->encryption_method);
86	476	if (!zip_secure_random(ctx->data, salt_length)) {
87	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
88	0	return -1;
89	0	}
90
91	476	if ((ctx->aes_ctx = _zip_winzip_aes_new((zip_uint8_t *)ctx->password, strlen(ctx->password), ctx->data, ctx->encryption_method, ctx->data + salt_length, &ctx->error)) == NULL) {
92	0	return -1;
93	0	}
94
95	476	if ((ctx->buffer = _zip_buffer_new(ctx->data, salt_length + WINZIP_AES_PASSWORD_VERIFY_LENGTH)) == NULL) {
96	0	_zip_winzip_aes_free(ctx->aes_ctx);
97	0	ctx->aes_ctx = NULL;
98	0	zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
99	0	return -1;
100	0	}
101
102	476	return 0;
103	476	}
104
105
106		static zip_int64_t
107	13.2k	winzip_aes_encrypt(zip_source_t src, void ud, void *data, zip_uint64_t length, zip_source_cmd_t cmd) {
108	13.2k	struct winzip_aes *ctx;
109	13.2k	zip_int64_t ret;
110	13.2k	zip_uint64_t buffer_n;
111
112	13.2k	ctx = (struct winzip_aes *)ud;
113
114	13.2k	switch (cmd) {
115	476	case ZIP_SOURCE_OPEN:
116	476	ctx->eof = false;
117	476	if (encrypt_header(src, ctx) < 0) {
118	0	return -1;
119	0	}
120	476	return 0;
121
122	9.90k	case ZIP_SOURCE_READ:
123	9.90k	buffer_n = 0;
124
125	9.90k	if (ctx->buffer) {
126	952	buffer_n = _zip_buffer_read(ctx->buffer, data, length);
127
128	952	data = (zip_uint8_t *)data + buffer_n;
129	952	length -= buffer_n;
130
131	952	if (_zip_buffer_eof(ctx->buffer)) {
132	952	_zip_buffer_free(ctx->buffer);
133	952	ctx->buffer = NULL;
134	952	}
135	952	}
136
137	9.90k	if (ctx->eof) {
138	512	return (zip_int64_t)buffer_n;
139	512	}
140
141	9.39k	if ((ret = zip_source_read(src, data, length)) < 0) {
142	0	zip_error_set_from_source(&ctx->error, src);
143	0	return -1;
144	0	}
145
146	9.39k	if (!_zip_winzip_aes_encrypt(ctx->aes_ctx, data, (zip_uint64_t)ret)) {
147	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
148		/* TODO: return partial read? */
149	0	return -1;
150	0	}
151
152	9.39k	if ((zip_uint64_t)ret < length) {
153	476	ctx->eof = true;
154	476	if (!_zip_winzip_aes_finish(ctx->aes_ctx, ctx->data)) {
155	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
156		/* TODO: return partial read? */
157	0	return -1;
158	0	}
159	476	_zip_winzip_aes_free(ctx->aes_ctx);
160	476	ctx->aes_ctx = NULL;
161	476	if ((ctx->buffer = _zip_buffer_new(ctx->data, HMAC_LENGTH)) == NULL) {
162	0	zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
163		/* TODO: return partial read? */
164	0	return -1;
165	0	}
166	476	buffer_n += _zip_buffer_read(ctx->buffer, (zip_uint8_t *)data + ret, length - (zip_uint64_t)ret);
167	476	}
168
169	9.39k	return (zip_int64_t)(buffer_n + (zip_uint64_t)ret);
170
171	476	case ZIP_SOURCE_CLOSE:
172	476	return 0;
173
174	476	case ZIP_SOURCE_STAT: {
175	476	zip_stat_t *st;
176
177	476	st = (zip_stat_t *)data;
178	476	st->encryption_method = ctx->encryption_method;
179	476	st->valid \|= ZIP_STAT_ENCRYPTION_METHOD;
180	476	if (st->valid & ZIP_STAT_COMP_SIZE) {
181	476	st->comp_size += 12 + SALT_LENGTH(ctx->encryption_method);
182	476	}
183
184	476	return 0;
185	9.39k	}
186
187	952	case ZIP_SOURCE_GET_FILE_ATTRIBUTES: {
188	952	zip_file_attributes_t attributes = (zip_file_attributes_t )data;
189	952	if (length < sizeof(*attributes)) {
190	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
191	0	return -1;
192	0	}
193	952	attributes->valid \|= ZIP_FILE_ATTRIBUTES_VERSION_NEEDED;
194	952	attributes->version_needed = 51;
195
196	952	return 0;
197	952	}
198
199	476	case ZIP_SOURCE_SUPPORTS:
200	476	return zip_source_make_command_bitmap(ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_CLOSE, ZIP_SOURCE_STAT, ZIP_SOURCE_ERROR, ZIP_SOURCE_FREE, ZIP_SOURCE_GET_FILE_ATTRIBUTES, -1);
201
202	0	case ZIP_SOURCE_ERROR:
203	0	return zip_error_to_data(&ctx->error, data, length);
204
205	476	case ZIP_SOURCE_FREE:
206	476	winzip_aes_free(ctx);
207	476	return 0;
208
209	0	default:
210	0	return zip_source_pass_to_lower_layer(src, data, length, cmd);
211	13.2k	}
212	13.2k	}
213
214
215		static void
216	476	winzip_aes_free(struct winzip_aes *ctx) {
217	476	if (ctx == NULL) {
218	0	return;
219	0	}
220
221	476	_zip_crypto_clear(ctx->password, strlen(ctx->password));
222	476	free(ctx->password);
223	476	zip_error_fini(&ctx->error);
224	476	_zip_buffer_free(ctx->buffer);
225	476	_zip_winzip_aes_free(ctx->aes_ctx);
226	476	free(ctx);
227	476	}
228
229
230		static struct winzip_aes *
231	476	winzip_aes_new(zip_uint16_t encryption_method, const char password, zip_error_t error) {
232	476	struct winzip_aes *ctx;
233
234	476	if ((ctx = (struct winzip_aes )malloc(sizeof(ctx))) == NULL) {
235	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
236	0	return NULL;
237	0	}
238
239	476	if ((ctx->password = strdup(password)) == NULL) {
240	0	free(ctx);
241	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
242	0	return NULL;
243	0	}
244
245	476	ctx->encryption_method = encryption_method;
246	476	ctx->buffer = NULL;
247	476	ctx->aes_ctx = NULL;
248
249	476	zip_error_init(&ctx->error);
250
251		ctx->eof = false;
252	476	return ctx;
253	476	}