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371 lines (306 loc) · 10.3 KB
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/* mz_strm_aes.c -- Stream for WinZip AES encryption
Version 2.3.8, July 14, 2018
part of the MiniZip project
Copyright (C) 2010-2018 Nathan Moinvaziri
https://github.com/nmoinvaz/minizip
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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aes.h"
#include "hmac.h"
#include "pwd2key.h"
#include "mz.h"
#include "mz_os.h"
#include "mz_strm.h"
#include "mz_strm_aes.h"
/***************************************************************************/
#define MZ_AES_KEY_LENGTH(mode) (8 * (mode & 3) + 8)
#define MZ_AES_KEY_LENGTH_MAX (32)
#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_MAC_LENGTH(mode) (10)
#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_aes_vtbl = {
mz_stream_aes_open,
mz_stream_aes_is_open,
mz_stream_aes_read,
mz_stream_aes_write,
mz_stream_aes_tell,
mz_stream_aes_seek,
mz_stream_aes_close,
mz_stream_aes_error,
mz_stream_aes_create,
mz_stream_aes_delete,
mz_stream_aes_get_prop_int64,
mz_stream_aes_set_prop_int64
};
/***************************************************************************/
typedef struct mz_stream_aes_s {
mz_stream stream;
int32_t mode;
int32_t error;
int16_t initialized;
uint8_t buffer[INT16_MAX];
int64_t total_in;
int64_t max_total_in;
int64_t total_out;
int16_t encryption_mode;
const char *password;
aes_encrypt_ctx encr_ctx[1];
hmac_ctx auth_ctx[1];
uint8_t nonce[AES_BLOCK_SIZE];
uint8_t encr_bfr[AES_BLOCK_SIZE];
uint32_t encr_pos;
} mz_stream_aes;
/***************************************************************************/
int32_t mz_stream_aes_open(void *stream, const char *path, int32_t mode)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
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];
int32_t salt_length = 0;
const char *password = path;
int32_t password_length = 0;
int32_t key_length = 0;
aes->total_in = 0;
aes->total_out = 0;
aes->initialized = 0;
if (mz_stream_is_open(aes->stream.base) != MZ_OK)
return MZ_STREAM_ERROR;
if (password == NULL)
password = aes->password;
if (password == NULL)
return MZ_PARAM_ERROR;
password_length = (int32_t)strlen(password);
if (password_length > MZ_AES_PW_LENGTH_MAX)
return MZ_PARAM_ERROR;
if (aes->encryption_mode < 1 || aes->encryption_mode > 3)
return MZ_PARAM_ERROR;
salt_length = MZ_AES_SALT_LENGTH(aes->encryption_mode);
if (mode & MZ_OPEN_MODE_WRITE)
{
mz_os_rand(salt_value, salt_length);
}
else if (mode & MZ_OPEN_MODE_READ)
{
if (mz_stream_read(aes->stream.base, salt_value, salt_length) != salt_length)
return MZ_STREAM_ERROR;
}
key_length = MZ_AES_KEY_LENGTH(aes->encryption_mode);
// Derive the encryption and authentication keys and the password verifier
derive_key((const 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
aes->encr_pos = AES_BLOCK_SIZE;
memset(aes->nonce, 0, AES_BLOCK_SIZE * sizeof(uint8_t));
// Initialize for encryption using key 1
aes_encrypt_key(kbuf, key_length, aes->encr_ctx);
// Initialize for authentication using key 2
hmac_sha_begin(HMAC_SHA1, aes->auth_ctx);
hmac_sha_key(kbuf + key_length, key_length, aes->auth_ctx);
memcpy(verify, kbuf + 2 * key_length, MZ_AES_PW_VERIFY_SIZE);
if (mode & MZ_OPEN_MODE_WRITE)
{
if (mz_stream_write(aes->stream.base, salt_value, salt_length) != salt_length)
return MZ_STREAM_ERROR;
aes->total_out += salt_length;
if (mz_stream_write(aes->stream.base, verify, MZ_AES_PW_VERIFY_SIZE) != MZ_AES_PW_VERIFY_SIZE)
return MZ_STREAM_ERROR;
aes->total_out += MZ_AES_PW_VERIFY_SIZE;
}
else if (mode & MZ_OPEN_MODE_READ)
{
aes->total_in += salt_length;
if (mz_stream_read(aes->stream.base, verify_expected, MZ_AES_PW_VERIFY_SIZE) != MZ_AES_PW_VERIFY_SIZE)
return MZ_STREAM_ERROR;
aes->total_in += MZ_AES_PW_VERIFY_SIZE;
if (memcmp(verify_expected, verify, MZ_AES_PW_VERIFY_SIZE) != 0)
return MZ_PASSWORD_ERROR;
}
aes->mode = mode;
aes->initialized = 1;
return MZ_OK;
}
int32_t mz_stream_aes_is_open(void *stream)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
if (aes->initialized == 0)
return MZ_STREAM_ERROR;
return MZ_OK;
}
static int32_t mz_stream_aes_encrypt_data(void *stream, uint8_t *buf, int32_t size)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
uint32_t pos = aes->encr_pos;
uint32_t i = 0;
while (i < (uint32_t)size)
{
if (pos == AES_BLOCK_SIZE)
{
uint32_t j = 0;
// Increment encryption nonce
while (j < 8 && !++aes->nonce[j])
j += 1;
// Encrypt the nonce to form next xor buffer
aes_encrypt(aes->nonce, aes->encr_bfr, aes->encr_ctx);
pos = 0;
}
buf[i++] ^= aes->encr_bfr[pos++];
}
aes->encr_pos = pos;
return MZ_OK;
}
int32_t mz_stream_aes_read(void *stream, void *buf, int32_t size)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
int32_t read = 0;
read = mz_stream_read(aes->stream.base, buf, size);
if (read > 0)
{
hmac_sha_data((uint8_t *)buf, read, aes->auth_ctx);
mz_stream_aes_encrypt_data(stream, (uint8_t *)buf, read);
}
aes->total_in += read;
return read;
}
int32_t mz_stream_aes_write(void *stream, const void *buf, int32_t size)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
int32_t written = 0;
if (size > (int32_t)sizeof(aes->buffer))
return MZ_STREAM_ERROR;
memcpy(aes->buffer, buf, size);
mz_stream_aes_encrypt_data(stream, (uint8_t *)aes->buffer, size);
hmac_sha_data((uint8_t *)aes->buffer, size, aes->auth_ctx);
written = mz_stream_write(aes->stream.base, aes->buffer, size);
if (written > 0)
aes->total_out += written;
return written;
}
int64_t mz_stream_aes_tell(void *stream)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
return mz_stream_tell(aes->stream.base);
}
int32_t mz_stream_aes_seek(void *stream, int64_t offset, int32_t origin)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
return mz_stream_seek(aes->stream.base, offset, origin);
}
int32_t mz_stream_aes_close(void *stream)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
uint8_t authcode[MZ_AES_AUTHCODE_SIZE];
uint8_t verify_authcode[MZ_AES_AUTHCODE_SIZE];
if (MZ_AES_MAC_LENGTH(aes->encryption_mode) != MZ_AES_AUTHCODE_SIZE)
return MZ_STREAM_ERROR;
hmac_sha_end(authcode, MZ_AES_MAC_LENGTH(aes->encryption_mode), aes->auth_ctx);
if (aes->mode & MZ_OPEN_MODE_WRITE)
{
if (mz_stream_write(aes->stream.base, authcode, MZ_AES_AUTHCODE_SIZE) != MZ_AES_AUTHCODE_SIZE)
return MZ_STREAM_ERROR;
aes->total_out += MZ_AES_AUTHCODE_SIZE;
}
else if (aes->mode & MZ_OPEN_MODE_READ)
{
if (mz_stream_read(aes->stream.base, verify_authcode, MZ_AES_AUTHCODE_SIZE) != MZ_AES_AUTHCODE_SIZE)
return MZ_STREAM_ERROR;
aes->total_in += MZ_AES_AUTHCODE_SIZE;
// If entire entry was not read this will fail
if (memcmp(authcode, verify_authcode, MZ_AES_AUTHCODE_SIZE) != 0)
return MZ_CRC_ERROR;
}
aes->initialized = 0;
return MZ_OK;
}
int32_t mz_stream_aes_error(void *stream)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
return aes->error;
}
void mz_stream_aes_set_password(void *stream, const char *password)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
aes->password = password;
}
void mz_stream_aes_set_encryption_mode(void *stream, int16_t encryption_mode)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
aes->encryption_mode = encryption_mode;
}
int32_t mz_stream_aes_get_prop_int64(void *stream, int32_t prop, int64_t *value)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
switch (prop)
{
case MZ_STREAM_PROP_TOTAL_IN:
*value = aes->total_in;
break;
case MZ_STREAM_PROP_TOTAL_OUT:
*value = aes->total_out;
break;
case MZ_STREAM_PROP_TOTAL_IN_MAX:
*value = aes->max_total_in;
break;
case MZ_STREAM_PROP_HEADER_SIZE:
*value = MZ_AES_SALT_LENGTH(aes->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_aes_set_prop_int64(void *stream, int32_t prop, int64_t value)
{
mz_stream_aes *aes = (mz_stream_aes *)stream;
switch (prop)
{
case MZ_STREAM_PROP_TOTAL_IN_MAX:
aes->max_total_in = value;
break;
default:
return MZ_EXIST_ERROR;
}
return MZ_OK;
}
void *mz_stream_aes_create(void **stream)
{
mz_stream_aes *aes = NULL;
aes = (mz_stream_aes *)MZ_ALLOC(sizeof(mz_stream_aes));
if (aes != NULL)
{
memset(aes, 0, sizeof(mz_stream_aes));
aes->stream.vtbl = &mz_stream_aes_vtbl;
aes->encryption_mode = MZ_AES_ENCRYPTION_MODE_256;
}
if (stream != NULL)
*stream = aes;
return aes;
}
void mz_stream_aes_delete(void **stream)
{
mz_stream_aes *aes = NULL;
if (stream == NULL)
return;
aes = (mz_stream_aes *)*stream;
if (aes != NULL)
MZ_FREE(aes);
*stream = NULL;
}
void *mz_stream_aes_get_interface(void)
{
return (void *)&mz_stream_aes_vtbl;
}