/src/minizip-ng/mz_strm_wzaes.c

Source (jump to first uncovered line)
/* mz_strm_wzaes.c -- Stream for WinZip AES encryption
   part of the minizip-ng project

   Copyright (C) Nathan Moinvaziri
      https://github.com/zlib-ng/minizip-ng
   Copyright (C) 1998-2010 Brian Gladman, Worcester, UK

   This program is distributed under the terms of the same license as zlib.
   See the accompanying LICENSE file for the full text of the license.
*/

#include "mz.h"
#include "mz_crypt.h"
#include "mz_strm.h"
#include "mz_strm_wzaes.h"

/***************************************************************************/

#define MZ_AES_KEYING_ITERATIONS    (1000)
#define MZ_AES_SALT_LENGTH(MODE)    (4 * (MODE & 3) + 4)
#define MZ_AES_SALT_LENGTH_MAX      (16)
#define MZ_AES_PW_LENGTH_MAX        (128)
#define MZ_AES_PW_VERIFY_SIZE       (2)
#define MZ_AES_AUTHCODE_SIZE        (10)

/***************************************************************************/

static mz_stream_vtbl mz_stream_wzaes_vtbl = {
    mz_stream_wzaes_open,
    mz_stream_wzaes_is_open,
    mz_stream_wzaes_read,
    mz_stream_wzaes_write,
    mz_stream_wzaes_tell,
    mz_stream_wzaes_seek,
    mz_stream_wzaes_close,
    mz_stream_wzaes_error,
    mz_stream_wzaes_create,
    mz_stream_wzaes_delete,
    mz_stream_wzaes_get_prop_int64,
    mz_stream_wzaes_set_prop_int64
};

/***************************************************************************/

typedef struct mz_stream_wzaes_s {
    mz_stream       stream;
    int32_t         mode;
    int32_t         error;
    int16_t         initialized;
    uint8_t         buffer[UINT16_MAX];
    int64_t         total_in;
    int64_t         max_total_in;
    int64_t         total_out;
    int16_t         encryption_mode;
    const char      *password;
    void            *aes;
    uint32_t        crypt_pos;
    uint8_t         crypt_block[MZ_AES_BLOCK_SIZE];
    void            *hmac;
    uint8_t         nonce[MZ_AES_BLOCK_SIZE];
} mz_stream_wzaes;

/***************************************************************************/

int32_t mz_stream_wzaes_open(void *stream, const char *path, int32_t mode) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    uint16_t salt_length = 0;
    uint16_t password_length = 0;
    uint16_t key_length = 0;
    uint8_t kbuf[2 * MZ_AES_KEY_LENGTH_MAX + MZ_AES_PW_VERIFY_SIZE];
    uint8_t verify[MZ_AES_PW_VERIFY_SIZE];
    uint8_t verify_expected[MZ_AES_PW_VERIFY_SIZE];
    uint8_t salt_value[MZ_AES_SALT_LENGTH_MAX];
    const char *password = path;

    wzaes->total_in = 0;
    wzaes->total_out = 0;
    wzaes->initialized = 0;

    if (mz_stream_is_open(wzaes->stream.base) != MZ_OK)
        return MZ_OPEN_ERROR;

    if (!password)
        password = wzaes->password;
    if (!password)
        return MZ_PARAM_ERROR;
    password_length = (uint16_t)strlen(password);
    if (password_length > MZ_AES_PW_LENGTH_MAX)
        return MZ_PARAM_ERROR;

    if (wzaes->encryption_mode < 1 || wzaes->encryption_mode > 3)
        return MZ_PARAM_ERROR;

    salt_length = MZ_AES_SALT_LENGTH(wzaes->encryption_mode);

    if (mode & MZ_OPEN_MODE_WRITE) {
        mz_crypt_rand(salt_value, salt_length);
    } else if (mode & MZ_OPEN_MODE_READ) {
        if (mz_stream_read(wzaes->stream.base, salt_value, salt_length) != salt_length)
            return MZ_READ_ERROR;
    }

    key_length = MZ_AES_KEY_LENGTH(wzaes->encryption_mode);

    /* Derive the encryption and authentication keys and the password verifier */
    mz_crypt_pbkdf2((uint8_t *)password, password_length, salt_value, salt_length,
        MZ_AES_KEYING_ITERATIONS, kbuf, 2 * key_length + MZ_AES_PW_VERIFY_SIZE);

    /* Initialize the encryption nonce and buffer pos */
    wzaes->crypt_pos = MZ_AES_BLOCK_SIZE;
    memset(wzaes->nonce, 0, sizeof(wzaes->nonce));

    /* Initialize for encryption using key 1 */
    mz_crypt_aes_reset(wzaes->aes);
    mz_crypt_aes_set_mode(wzaes->aes, wzaes->encryption_mode);
    mz_crypt_aes_set_encrypt_key(wzaes->aes, kbuf, key_length);

    /* Initialize for authentication using key 2 */
    mz_crypt_hmac_reset(wzaes->hmac);
    mz_crypt_hmac_set_algorithm(wzaes->hmac, MZ_HASH_SHA1);
    mz_crypt_hmac_init(wzaes->hmac, kbuf + key_length, key_length);

    memcpy(verify, kbuf + (2 * key_length), MZ_AES_PW_VERIFY_SIZE);

    if (mode & MZ_OPEN_MODE_WRITE) {
        if (mz_stream_write(wzaes->stream.base, salt_value, salt_length) != salt_length)
            return MZ_WRITE_ERROR;

        wzaes->total_out += salt_length;

        if (mz_stream_write(wzaes->stream.base, verify, MZ_AES_PW_VERIFY_SIZE) != MZ_AES_PW_VERIFY_SIZE)
            return MZ_WRITE_ERROR;

        wzaes->total_out += MZ_AES_PW_VERIFY_SIZE;
    } else if (mode & MZ_OPEN_MODE_READ) {
        wzaes->total_in += salt_length;

        if (mz_stream_read(wzaes->stream.base, verify_expected, MZ_AES_PW_VERIFY_SIZE) != MZ_AES_PW_VERIFY_SIZE)
            return MZ_READ_ERROR;

        wzaes->total_in += MZ_AES_PW_VERIFY_SIZE;

        if (memcmp(verify_expected, verify, MZ_AES_PW_VERIFY_SIZE) != 0)
            return MZ_PASSWORD_ERROR;
    }

    wzaes->mode = mode;
    wzaes->initialized = 1;

    return MZ_OK;
}

int32_t mz_stream_wzaes_is_open(void *stream) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    if (!wzaes->initialized)
        return MZ_OPEN_ERROR;
    return MZ_OK;
}

static int32_t mz_stream_wzaes_ctr_encrypt(void *stream, uint8_t *buf, int32_t size) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    uint32_t pos = wzaes->crypt_pos;
    uint32_t i = 0;
    int32_t err = MZ_OK;

    while (i < (uint32_t)size) {
        if (pos == MZ_AES_BLOCK_SIZE) {
            uint32_t j = 0;

            /* Increment encryption nonce */
            while (j < 8 && !++wzaes->nonce[j])
                j += 1;

            /* Encrypt the nonce to form next xor buffer */
            memcpy(wzaes->crypt_block, wzaes->nonce, MZ_AES_BLOCK_SIZE);
            mz_crypt_aes_encrypt(wzaes->aes, wzaes->crypt_block, sizeof(wzaes->crypt_block));
            pos = 0;
        }

        buf[i++] ^= wzaes->crypt_block[pos++];
    }

    wzaes->crypt_pos = pos;
    return err;
}

int32_t mz_stream_wzaes_read(void *stream, void *buf, int32_t size) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    int64_t max_total_in = 0;
    int32_t bytes_to_read = size;
    int32_t read = 0;

    max_total_in = wzaes->max_total_in - MZ_AES_FOOTER_SIZE;
    if ((int64_t)bytes_to_read > (max_total_in - wzaes->total_in))
        bytes_to_read = (int32_t)(max_total_in - wzaes->total_in);

    read = mz_stream_read(wzaes->stream.base, buf, bytes_to_read);

    if (read > 0) {
        mz_crypt_hmac_update(wzaes->hmac, (uint8_t *)buf, read);
        mz_stream_wzaes_ctr_encrypt(stream, (uint8_t *)buf, read);

        wzaes->total_in += read;
    }

    return read;
}

int32_t mz_stream_wzaes_write(void *stream, const void *buf, int32_t size) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    const uint8_t *buf_ptr = (const uint8_t *)buf;
    int32_t bytes_to_write = sizeof(wzaes->buffer);
    int32_t total_written = 0;
    int32_t written = 0;

    if (size < 0)
        return MZ_PARAM_ERROR;

    do {
        if (bytes_to_write > (size - total_written))
            bytes_to_write = (size - total_written);

        memcpy(wzaes->buffer, buf_ptr, bytes_to_write);
        buf_ptr += bytes_to_write;

        mz_stream_wzaes_ctr_encrypt(stream, (uint8_t *)wzaes->buffer, bytes_to_write);
        mz_crypt_hmac_update(wzaes->hmac, wzaes->buffer, bytes_to_write);

        written = mz_stream_write(wzaes->stream.base, wzaes->buffer, bytes_to_write);
        if (written < 0)
            return written;

        total_written += written;
    } while (total_written < size && written > 0);

    wzaes->total_out += total_written;
    return total_written;
}

int64_t mz_stream_wzaes_tell(void *stream) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    return mz_stream_tell(wzaes->stream.base);
}

int32_t mz_stream_wzaes_seek(void *stream, int64_t offset, int32_t origin) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    return mz_stream_seek(wzaes->stream.base, offset, origin);
}

int32_t mz_stream_wzaes_close(void *stream) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    uint8_t expected_hash[MZ_AES_AUTHCODE_SIZE];
    uint8_t computed_hash[MZ_HASH_SHA1_SIZE];

    mz_crypt_hmac_end(wzaes->hmac, computed_hash, sizeof(computed_hash));

    if (wzaes->mode & MZ_OPEN_MODE_WRITE) {
        if (mz_stream_write(wzaes->stream.base, computed_hash, MZ_AES_AUTHCODE_SIZE) != MZ_AES_AUTHCODE_SIZE)
            return MZ_WRITE_ERROR;

        wzaes->total_out += MZ_AES_AUTHCODE_SIZE;
    } else if (wzaes->mode & MZ_OPEN_MODE_READ) {
        if (mz_stream_read(wzaes->stream.base, expected_hash, MZ_AES_AUTHCODE_SIZE) != MZ_AES_AUTHCODE_SIZE)
            return MZ_READ_ERROR;

        wzaes->total_in += MZ_AES_AUTHCODE_SIZE;

        /* If entire entry was not read this will fail */
        if (memcmp(computed_hash, expected_hash, MZ_AES_AUTHCODE_SIZE) != 0)
            return MZ_CRC_ERROR;
    }

    wzaes->initialized = 0;
    return MZ_OK;
}

int32_t mz_stream_wzaes_error(void *stream) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    return wzaes->error;
}

void mz_stream_wzaes_set_password(void *stream, const char *password) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    wzaes->password = password;
}

void mz_stream_wzaes_set_encryption_mode(void *stream, int16_t encryption_mode) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    wzaes->encryption_mode = encryption_mode;
}

int32_t mz_stream_wzaes_get_prop_int64(void *stream, int32_t prop, int64_t *value) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    switch (prop) {
    case MZ_STREAM_PROP_TOTAL_IN:
        *value = wzaes->total_in;
        break;
    case MZ_STREAM_PROP_TOTAL_OUT:
        *value = wzaes->total_out;
        break;
    case MZ_STREAM_PROP_TOTAL_IN_MAX:
        *value = wzaes->max_total_in;
        break;
    case MZ_STREAM_PROP_HEADER_SIZE:
        *value = MZ_AES_SALT_LENGTH((int64_t)wzaes->encryption_mode) + MZ_AES_PW_VERIFY_SIZE;
        break;
    case MZ_STREAM_PROP_FOOTER_SIZE:
        *value = MZ_AES_AUTHCODE_SIZE;
        break;
    default:
        return MZ_EXIST_ERROR;
    }
    return MZ_OK;
}

int32_t mz_stream_wzaes_set_prop_int64(void *stream, int32_t prop, int64_t value) {
    mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
    switch (prop) {
    case MZ_STREAM_PROP_TOTAL_IN_MAX:
        wzaes->max_total_in = value;
        break;
    default:
        return MZ_EXIST_ERROR;
    }
    return MZ_OK;
}

void *mz_stream_wzaes_create(void **stream) {
    mz_stream_wzaes *wzaes = NULL;

    wzaes = (mz_stream_wzaes *)calloc(1, sizeof(mz_stream_wzaes));
    if (wzaes) {
        wzaes->stream.vtbl = &mz_stream_wzaes_vtbl;
        wzaes->encryption_mode = MZ_AES_ENCRYPTION_MODE_256;

        mz_crypt_hmac_create(&wzaes->hmac);
        mz_crypt_aes_create(&wzaes->aes);
    }
    if (stream)
        *stream = wzaes;

    return wzaes;
}

void mz_stream_wzaes_delete(void **stream) {
    mz_stream_wzaes *wzaes = NULL;
    if (!stream)
        return;
    wzaes = (mz_stream_wzaes *)*stream;
    if (wzaes) {
        mz_crypt_aes_delete(&wzaes->aes);
        mz_crypt_hmac_delete(&wzaes->hmac);
        free(wzaes);
    }
    *stream = NULL;
}

void *mz_stream_wzaes_get_interface(void) {
    return (void *)&mz_stream_wzaes_vtbl;
}

Coverage Report

Created: 2023-03-26 06:14

Line	Count	Source (jump to first uncovered line)
1		/* mz_strm_wzaes.c -- Stream for WinZip AES encryption
2		part of the minizip-ng project
3
4		Copyright (C) Nathan Moinvaziri
5		https://github.com/zlib-ng/minizip-ng
6		Copyright (C) 1998-2010 Brian Gladman, Worcester, UK
7
8		This program is distributed under the terms of the same license as zlib.
9		See the accompanying LICENSE file for the full text of the license.
10		*/
11
12		#include "mz.h"
13		#include "mz_crypt.h"
14		#include "mz_strm.h"
15		#include "mz_strm_wzaes.h"
16
17		/***************************************************************************/
18
19	0	#define MZ_AES_KEYING_ITERATIONS (1000)
20	0	#define MZ_AES_SALT_LENGTH(MODE) (4 * (MODE & 3) + 4)
21		#define MZ_AES_SALT_LENGTH_MAX (16)
22	0	#define MZ_AES_PW_LENGTH_MAX (128)
23	0	#define MZ_AES_PW_VERIFY_SIZE (2)
24	0	#define MZ_AES_AUTHCODE_SIZE (10)
25
26		/***************************************************************************/
27
28		static mz_stream_vtbl mz_stream_wzaes_vtbl = {
29		mz_stream_wzaes_open,
30		mz_stream_wzaes_is_open,
31		mz_stream_wzaes_read,
32		mz_stream_wzaes_write,
33		mz_stream_wzaes_tell,
34		mz_stream_wzaes_seek,
35		mz_stream_wzaes_close,
36		mz_stream_wzaes_error,
37		mz_stream_wzaes_create,
38		mz_stream_wzaes_delete,
39		mz_stream_wzaes_get_prop_int64,
40		mz_stream_wzaes_set_prop_int64
41		};
42
43		/***************************************************************************/
44
45		typedef struct mz_stream_wzaes_s {
46		mz_stream stream;
47		int32_t mode;
48		int32_t error;
49		int16_t initialized;
50		uint8_t buffer[UINT16_MAX];
51		int64_t total_in;
52		int64_t max_total_in;
53		int64_t total_out;
54		int16_t encryption_mode;
55		const char *password;
56		void *aes;
57		uint32_t crypt_pos;
58		uint8_t crypt_block[MZ_AES_BLOCK_SIZE];
59		void *hmac;
60		uint8_t nonce[MZ_AES_BLOCK_SIZE];
61		} mz_stream_wzaes;
62
63		/***************************************************************************/
64
65	0	int32_t mz_stream_wzaes_open(void stream, const char path, int32_t mode) {
66	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
67	0	uint16_t salt_length = 0;
68	0	uint16_t password_length = 0;
69	0	uint16_t key_length = 0;
70	0	uint8_t kbuf[2 * MZ_AES_KEY_LENGTH_MAX + MZ_AES_PW_VERIFY_SIZE];
71	0	uint8_t verify[MZ_AES_PW_VERIFY_SIZE];
72	0	uint8_t verify_expected[MZ_AES_PW_VERIFY_SIZE];
73	0	uint8_t salt_value[MZ_AES_SALT_LENGTH_MAX];
74	0	const char *password = path;
75
76	0	wzaes->total_in = 0;
77	0	wzaes->total_out = 0;
78	0	wzaes->initialized = 0;
79
80	0	if (mz_stream_is_open(wzaes->stream.base) != MZ_OK)
81	0	return MZ_OPEN_ERROR;
82
83	0	if (!password)
84	0	password = wzaes->password;
85	0	if (!password)
86	0	return MZ_PARAM_ERROR;
87	0	password_length = (uint16_t)strlen(password);
88	0	if (password_length > MZ_AES_PW_LENGTH_MAX)
89	0	return MZ_PARAM_ERROR;
90
91	0	if (wzaes->encryption_mode < 1 \|\| wzaes->encryption_mode > 3)
92	0	return MZ_PARAM_ERROR;
93
94	0	salt_length = MZ_AES_SALT_LENGTH(wzaes->encryption_mode);
95
96	0	if (mode & MZ_OPEN_MODE_WRITE) {
97	0	mz_crypt_rand(salt_value, salt_length);
98	0	} else if (mode & MZ_OPEN_MODE_READ) {
99	0	if (mz_stream_read(wzaes->stream.base, salt_value, salt_length) != salt_length)
100	0	return MZ_READ_ERROR;
101	0	}
102
103	0	key_length = MZ_AES_KEY_LENGTH(wzaes->encryption_mode);
104
105		/* Derive the encryption and authentication keys and the password verifier */
106	0	mz_crypt_pbkdf2((uint8_t *)password, password_length, salt_value, salt_length,
107	0	MZ_AES_KEYING_ITERATIONS, kbuf, 2 * key_length + MZ_AES_PW_VERIFY_SIZE);
108
109		/* Initialize the encryption nonce and buffer pos */
110	0	wzaes->crypt_pos = MZ_AES_BLOCK_SIZE;
111	0	memset(wzaes->nonce, 0, sizeof(wzaes->nonce));
112
113		/* Initialize for encryption using key 1 */
114	0	mz_crypt_aes_reset(wzaes->aes);
115	0	mz_crypt_aes_set_mode(wzaes->aes, wzaes->encryption_mode);
116	0	mz_crypt_aes_set_encrypt_key(wzaes->aes, kbuf, key_length);
117
118		/* Initialize for authentication using key 2 */
119	0	mz_crypt_hmac_reset(wzaes->hmac);
120	0	mz_crypt_hmac_set_algorithm(wzaes->hmac, MZ_HASH_SHA1);
121	0	mz_crypt_hmac_init(wzaes->hmac, kbuf + key_length, key_length);
122
123	0	memcpy(verify, kbuf + (2 * key_length), MZ_AES_PW_VERIFY_SIZE);
124
125	0	if (mode & MZ_OPEN_MODE_WRITE) {
126	0	if (mz_stream_write(wzaes->stream.base, salt_value, salt_length) != salt_length)
127	0	return MZ_WRITE_ERROR;
128
129	0	wzaes->total_out += salt_length;
130
131	0	if (mz_stream_write(wzaes->stream.base, verify, MZ_AES_PW_VERIFY_SIZE) != MZ_AES_PW_VERIFY_SIZE)
132	0	return MZ_WRITE_ERROR;
133
134	0	wzaes->total_out += MZ_AES_PW_VERIFY_SIZE;
135	0	} else if (mode & MZ_OPEN_MODE_READ) {
136	0	wzaes->total_in += salt_length;
137
138	0	if (mz_stream_read(wzaes->stream.base, verify_expected, MZ_AES_PW_VERIFY_SIZE) != MZ_AES_PW_VERIFY_SIZE)
139	0	return MZ_READ_ERROR;
140
141	0	wzaes->total_in += MZ_AES_PW_VERIFY_SIZE;
142
143	0	if (memcmp(verify_expected, verify, MZ_AES_PW_VERIFY_SIZE) != 0)
144	0	return MZ_PASSWORD_ERROR;
145	0	}
146
147	0	wzaes->mode = mode;
148	0	wzaes->initialized = 1;
149
150	0	return MZ_OK;
151	0	}
152
153	0	int32_t mz_stream_wzaes_is_open(void *stream) {
154	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
155	0	if (!wzaes->initialized)
156	0	return MZ_OPEN_ERROR;
157	0	return MZ_OK;
158	0	}
159
160	0	static int32_t mz_stream_wzaes_ctr_encrypt(void stream, uint8_t buf, int32_t size) {
161	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
162	0	uint32_t pos = wzaes->crypt_pos;
163	0	uint32_t i = 0;
164	0	int32_t err = MZ_OK;
165
166	0	while (i < (uint32_t)size) {
167	0	if (pos == MZ_AES_BLOCK_SIZE) {
168	0	uint32_t j = 0;
169
170		/* Increment encryption nonce */
171	0	while (j < 8 && !++wzaes->nonce[j])
172	0	j += 1;
173
174		/* Encrypt the nonce to form next xor buffer */
175	0	memcpy(wzaes->crypt_block, wzaes->nonce, MZ_AES_BLOCK_SIZE);
176	0	mz_crypt_aes_encrypt(wzaes->aes, wzaes->crypt_block, sizeof(wzaes->crypt_block));
177	0	pos = 0;
178	0	}
179
180	0	buf[i++] ^= wzaes->crypt_block[pos++];
181	0	}
182
183	0	wzaes->crypt_pos = pos;
184	0	return err;
185	0	}
186
187	0	int32_t mz_stream_wzaes_read(void stream, void buf, int32_t size) {
188	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
189	0	int64_t max_total_in = 0;
190	0	int32_t bytes_to_read = size;
191	0	int32_t read = 0;
192
193	0	max_total_in = wzaes->max_total_in - MZ_AES_FOOTER_SIZE;
194	0	if ((int64_t)bytes_to_read > (max_total_in - wzaes->total_in))
195	0	bytes_to_read = (int32_t)(max_total_in - wzaes->total_in);
196
197	0	read = mz_stream_read(wzaes->stream.base, buf, bytes_to_read);
198
199	0	if (read > 0) {
200	0	mz_crypt_hmac_update(wzaes->hmac, (uint8_t *)buf, read);
201	0	mz_stream_wzaes_ctr_encrypt(stream, (uint8_t *)buf, read);
202
203	0	wzaes->total_in += read;
204	0	}
205
206	0	return read;
207	0	}
208
209	0	int32_t mz_stream_wzaes_write(void stream, const void buf, int32_t size) {
210	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
211	0	const uint8_t buf_ptr = (const uint8_t )buf;
212	0	int32_t bytes_to_write = sizeof(wzaes->buffer);
213	0	int32_t total_written = 0;
214	0	int32_t written = 0;
215
216	0	if (size < 0)
217	0	return MZ_PARAM_ERROR;
218
219	0	do {
220	0	if (bytes_to_write > (size - total_written))
221	0	bytes_to_write = (size - total_written);
222
223	0	memcpy(wzaes->buffer, buf_ptr, bytes_to_write);
224	0	buf_ptr += bytes_to_write;
225
226	0	mz_stream_wzaes_ctr_encrypt(stream, (uint8_t *)wzaes->buffer, bytes_to_write);
227	0	mz_crypt_hmac_update(wzaes->hmac, wzaes->buffer, bytes_to_write);
228
229	0	written = mz_stream_write(wzaes->stream.base, wzaes->buffer, bytes_to_write);
230	0	if (written < 0)
231	0	return written;
232
233	0	total_written += written;
234	0	} while (total_written < size && written > 0);
235
236	0	wzaes->total_out += total_written;
237	0	return total_written;
238	0	}
239
240	0	int64_t mz_stream_wzaes_tell(void *stream) {
241	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
242	0	return mz_stream_tell(wzaes->stream.base);
243	0	}
244
245	0	int32_t mz_stream_wzaes_seek(void *stream, int64_t offset, int32_t origin) {
246	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
247	0	return mz_stream_seek(wzaes->stream.base, offset, origin);
248	0	}
249
250	0	int32_t mz_stream_wzaes_close(void *stream) {
251	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
252	0	uint8_t expected_hash[MZ_AES_AUTHCODE_SIZE];
253	0	uint8_t computed_hash[MZ_HASH_SHA1_SIZE];
254
255	0	mz_crypt_hmac_end(wzaes->hmac, computed_hash, sizeof(computed_hash));
256
257	0	if (wzaes->mode & MZ_OPEN_MODE_WRITE) {
258	0	if (mz_stream_write(wzaes->stream.base, computed_hash, MZ_AES_AUTHCODE_SIZE) != MZ_AES_AUTHCODE_SIZE)
259	0	return MZ_WRITE_ERROR;
260
261	0	wzaes->total_out += MZ_AES_AUTHCODE_SIZE;
262	0	} else if (wzaes->mode & MZ_OPEN_MODE_READ) {
263	0	if (mz_stream_read(wzaes->stream.base, expected_hash, MZ_AES_AUTHCODE_SIZE) != MZ_AES_AUTHCODE_SIZE)
264	0	return MZ_READ_ERROR;
265
266	0	wzaes->total_in += MZ_AES_AUTHCODE_SIZE;
267
268		/* If entire entry was not read this will fail */
269	0	if (memcmp(computed_hash, expected_hash, MZ_AES_AUTHCODE_SIZE) != 0)
270	0	return MZ_CRC_ERROR;
271	0	}
272
273	0	wzaes->initialized = 0;
274	0	return MZ_OK;
275	0	}
276
277	0	int32_t mz_stream_wzaes_error(void *stream) {
278	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
279	0	return wzaes->error;
280	0	}
281
282	0	void mz_stream_wzaes_set_password(void stream, const char password) {
283	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
284	0	wzaes->password = password;
285	0	}
286
287	0	void mz_stream_wzaes_set_encryption_mode(void *stream, int16_t encryption_mode) {
288	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
289	0	wzaes->encryption_mode = encryption_mode;
290	0	}
291
292	0	int32_t mz_stream_wzaes_get_prop_int64(void stream, int32_t prop, int64_t value) {
293	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
294	0	switch (prop) {
295	0	case MZ_STREAM_PROP_TOTAL_IN:
296	0	*value = wzaes->total_in;
297	0	break;
298	0	case MZ_STREAM_PROP_TOTAL_OUT:
299	0	*value = wzaes->total_out;
300	0	break;
301	0	case MZ_STREAM_PROP_TOTAL_IN_MAX:
302	0	*value = wzaes->max_total_in;
303	0	break;
304	0	case MZ_STREAM_PROP_HEADER_SIZE:
305	0	*value = MZ_AES_SALT_LENGTH((int64_t)wzaes->encryption_mode) + MZ_AES_PW_VERIFY_SIZE;
306	0	break;
307	0	case MZ_STREAM_PROP_FOOTER_SIZE:
308	0	*value = MZ_AES_AUTHCODE_SIZE;
309	0	break;
310	0	default:
311	0	return MZ_EXIST_ERROR;
312	0	}
313	0	return MZ_OK;
314	0	}
315
316	0	int32_t mz_stream_wzaes_set_prop_int64(void *stream, int32_t prop, int64_t value) {
317	0	mz_stream_wzaes wzaes = (mz_stream_wzaes )stream;
318	0	switch (prop) {
319	0	case MZ_STREAM_PROP_TOTAL_IN_MAX:
320	0	wzaes->max_total_in = value;
321	0	break;
322	0	default:
323	0	return MZ_EXIST_ERROR;
324	0	}
325	0	return MZ_OK;
326	0	}
327
328	0	void mz_stream_wzaes_create(void *stream) {
329	0	mz_stream_wzaes *wzaes = NULL;
330
331	0	wzaes = (mz_stream_wzaes *)calloc(1, sizeof(mz_stream_wzaes));
332	0	if (wzaes) {
333	0	wzaes->stream.vtbl = &mz_stream_wzaes_vtbl;
334	0	wzaes->encryption_mode = MZ_AES_ENCRYPTION_MODE_256;
335
336	0	mz_crypt_hmac_create(&wzaes->hmac);
337	0	mz_crypt_aes_create(&wzaes->aes);
338	0	}
339	0	if (stream)
340	0	*stream = wzaes;
341
342	0	return wzaes;
343	0	}
344
345	0	void mz_stream_wzaes_delete(void **stream) {
346	0	mz_stream_wzaes *wzaes = NULL;
347	0	if (!stream)
348	0	return;
349	0	wzaes = (mz_stream_wzaes )stream;
350	0	if (wzaes) {
351	0	mz_crypt_aes_delete(&wzaes->aes);
352	0	mz_crypt_hmac_delete(&wzaes->hmac);
353	0	free(wzaes);
354	0	}
355	0	*stream = NULL;
356	0	}
357
358	0	void *mz_stream_wzaes_get_interface(void) {
359	0	return (void *)&mz_stream_wzaes_vtbl;
360	0	}