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365 lines (294 loc) · 11.4 KB
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/* 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_KEY_LENGTH(STRENGTH) (8 * (STRENGTH & 3) + 8)
#define MZ_AES_KEYING_ITERATIONS (1000)
#define MZ_AES_SALT_LENGTH(STRENGTH) (4 * (STRENGTH & 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;
uint8_t strength;
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->strength < 1 || wzaes->strength > 3)
return MZ_PARAM_ERROR;
key_length = MZ_AES_KEY_LENGTH(wzaes->strength);
salt_length = MZ_AES_SALT_LENGTH(wzaes->strength);
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;
}
/* 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 buffer pos */
wzaes->crypt_pos = MZ_AES_BLOCK_SIZE;
/* Use fixed zeroed IV/nonce for CTR mode */
memset(wzaes->nonce, 0, sizeof(wzaes->nonce));
/* Initialize for encryption using key 1 */
mz_crypt_aes_reset(wzaes->aes);
mz_crypt_aes_set_encrypt_key(wzaes->aes, kbuf, key_length, NULL, 0);
/* 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 using ECB mode to form next xor buffer */
memcpy(wzaes->crypt_block, wzaes->nonce, MZ_AES_BLOCK_SIZE);
mz_crypt_aes_encrypt(wzaes->aes, NULL, 0, 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_strength(void *stream, uint8_t strength) {
mz_stream_wzaes *wzaes = (mz_stream_wzaes *)stream;
wzaes->strength = strength;
}
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->strength) + 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) {
mz_stream_wzaes *wzaes = (mz_stream_wzaes *)calloc(1, sizeof(mz_stream_wzaes));
if (wzaes) {
wzaes->stream.vtbl = &mz_stream_wzaes_vtbl;
wzaes->strength
4CB3
= MZ_AES_STRENGTH_256;
wzaes->hmac = mz_crypt_hmac_create();
if (!wzaes->hmac) {
free(wzaes);
return NULL;
}
wzaes->aes = mz_crypt_aes_create();
if (!wzaes->aes) {
mz_crypt_hmac_delete(&wzaes->hmac);
free(wzaes);
return NULL;
}
}
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;
}