在C/C++编码中，open对close，new对delete，malloc对free等等是严格要求的，否则会有各种泄露的奇葩情况。
但是实际编码中，各种异常捕捉和错误判断又让编码变得繁琐臃肿。
后来在使用golang中，defer方法使用非常方便，C++虽然没有自带的，但是可以写嘛！
借助C++类的析构方法和lambada表达式，还有std::function容器，很容易写出来一个自己的defer（以下代码是复制来的，感觉非常的干练，自己写的不好看不贴了，后来也用了这个.h）
blackfeather 2020/9/1 ℃ 0评论
有缘人拿去。。。RFC 3394,AESUnwrap。。。某些情况下使用的。
uint8_t AES_unwrap(uint8_t *kek, uint16_t key_len, uint8_t *cipher_text, uint16_t cipher_len, uint8_t *output)
{
uint8_t a[8], b[16];
uint8_t *r;
uint8_t *c;
uint16_t i, j, n;
AES_KEY ctx;
if (! kek || cipher_len < 16 || ! cipher_text || ! output)
{
/* We don't do anything with the return value */
return 1;
}
/* Initialize variables */
n = (cipher_len/8)-1; /* the algorithm works on 64-bits at a time */
memcpy(a, cipher_text, 8);
r = output;
c = cipher_text;
memcpy(r, c+8, cipher_len - 8);
/* Compute intermediate values */
for (j=5; j >= 0; --j)
{
r = output + (n - 1) * 8;
/* DEBUG_DUMP("r1", (r-8), 8); */
/* DEBUG_DUMP("r2", r, 8); */
for (i = n; i >= 1; --i)
{
uint16_t t = (n*j) + i;
/* DEBUG_DUMP("a", a, 8); */
memcpy(b, a, 8);
b[7] ^= t;
/* DEBUG_DUMP("a plus t", b, 8); */
memcpy(b+8, r, 8);
AES_set_decrypt_key(kek, 128, &ctx);
AES_decrypt(b, b, &ctx); /* NOTE: we are using the same src and dst buffer. It's ok. */
/* DEBUG_DUMP("aes decrypt", b, 16) */
memcpy(a,b,8);
memcpy(r, b+8, 8);
r -= 8;
}
}
/* DEBUG_DUMP("a", a, 8); */
/* DEBUG_DUMP("output", output, cipher_len - 8); */
return 0;
}blackfeather 2019/6/25 ℃ 0评论
scrypt算法，不多解释。
可直接在windows、linux、android（ndk）上编译。
crypto_scrypt.h
/*- * Copyright 2009 Colin Percival * All rights reserved. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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. * * This file was originally written by Colin Percival as part of the Tarsnap * online backup system. */ #ifndef _CRYPTO_SCRYPT_H_ #define _CRYPTO_SCRYPT_H_ #include <stdint.h> /** * crypto_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen): * Compute scrypt(passwd[0 .. passwdlen - 1], salt[0 .. saltlen - 1], N, r, * p, buflen) and write the result into buf. The parameters r, p, and buflen * must satisfy r * p < 2^30 and buflen <= (2^32 - 1) * 32. The parameter N * must be a power of 2 greater than 1. * * Return 0 on success; or -1 on error. */ int crypto_scrypt(const uint8_t *, size_t, const uint8_t *, size_t, uint64_t, uint32_t, uint32_t, uint8_t *, size_t); #endif /* !_CRYPTO_SCRYPT_H_ */
blackfeather 2019/6/19 ℃ 0评论
安卓很早就开始启用了gatekeeper的锁屏密码机制，如果未启用TEE的情况下，是默认使用“软加密”的方式，可以离线破解出原始密码，知道原始密码在某些情况下还是比较有用的，以下是破解实例，自行调整。
import struct
import binascii
import scrypt
N = 16384;
r = 8;
p = 1;
f = open('gatekeeper.password.key', 'rb')
blob = f.read()
s = struct.Struct('<'+'17s 8s 32s')
(meta, salt, signature) = s.unpack_from(blob)
for one in "0123456789":
for two in "0123456789":
for three in "0123456789":
for four in "0123456789":
password = one + two + three + four;
print 'pass: %s' % password
to_hash = meta
to_hash += password
hash = scrypt.hash(to_hash, salt, N, r, p)
print 'signature %s' % signature.encode('hex')
print 'Hash: %s' % hash[0:32].encode('hex')
if hash[0:32] == signature:
print "OK"
exit()blackfeather 2019/6/19 ℃ 0评论
工作中经常用到protobuf的场景，但是由于protobuf不是明文信息，在调试和检查时不是很直观，于是就有转换为json的需求，方便排查。
json使用的jsoncpp库，自行补上头文件等。
void _field2json(const Message& msg, const FieldDescriptor *field, size_t index, Json::Value &jsonValue)
{
const Reflection *ref = msg.GetReflection();
const bool repeated = field->is_repeated();
switch (field->cpp_type())
{
#define _CONVERT(type, ctype, sfunc, afunc) \
case FieldDescriptor::type: { \
const ctype value = (repeated)? \
ref->afunc(msg, field, index): \
ref->sfunc(msg, field); \
jsonValue = value; \
break; \
}
_CONVERT(CPPTYPE_DOUBLE, double, GetDouble, GetRepeatedDouble);
_CONVERT(CPPTYPE_FLOAT, double, GetFloat, GetRepeatedFloat);
_CONVERT(CPPTYPE_INT64, INT64, GetInt64, GetRepeatedInt64);
_CONVERT(CPPTYPE_UINT64, UINT64, GetUInt64, GetRepeatedUInt64);
_CONVERT(CPPTYPE_INT32, INT32, GetInt32, GetRepeatedInt32);
_CONVERT(CPPTYPE_UINT32, UINT32, GetUInt32, GetRepeatedUInt32);
_CONVERT(CPPTYPE_BOOL, bool, GetBool, GetRepeatedBool);
#undef _CONVERT
case FieldDescriptor::CPPTYPE_STRING: {
std::string scratch;
const std::string &value = (repeated) ?
ref->GetRepeatedStringReference(msg, field, index, &scratch) :
ref->GetStringReference(msg, field, &scratch);
if (field->type() == FieldDescriptor::TYPE_BYTES)
jsonValue = base64_encode((const unsigned char *)value.c_str(), value.length());
else
jsonValue = value.c_str();
break;
}
case FieldDescriptor::CPPTYPE_MESSAGE: {
const Message& mf = (repeated) ?
ref->GetRepeatedMessage(msg, field, index) :
ref->GetMessage(msg, field);
jsonValue = Protobuf2Json(mf);
break;
}
case FieldDescriptor::CPPTYPE_ENUM: {
const EnumValueDescriptor* ef = (repeated) ?
ref->GetRepeatedEnum(msg, field, index) :
ref->GetEnum(msg, field);
jsonValue = ef->number();
break;
}
default:
break;
}
//if (!jf) throw j2pb_error(field, "Fail to convert to json");
//return jsonRet;
}
Json::Value Protobuf2Json(const Message &msg)
{
Json::Value jsonRet;
const Descriptor *d = msg.GetDescriptor();
const Reflection *ref = msg.GetReflection();
if (!d || !ref)
return jsonRet;
std::vector<const FieldDescriptor *> fields;
ref->ListFields(msg, &fields);
for (size_t i = 0; i != fields.size(); i++)
{
const FieldDescriptor *field = fields[i];
const std::string &name = (field->is_extension()) ? field->full_name() : field->name();
if (field->is_repeated())
{
size_t count = ref->FieldSize(msg, field);
if (!count)
continue;
for (size_t j = 0; j < count; j++)
_field2json(msg, field, j, jsonRet[name][j]);
}
else if (ref->HasField(msg, field))
_field2json(msg, field, 0, jsonRet[name]);
else
continue;
}
return jsonRet;
}blackfeather 2019/6/6 ℃ 0评论
IOS通过备份，得到的目录里面是一片乱码（严格来说是sha1编码）。解析出具体的文件列表的分析有很多了，整理了一下，写出来。
大概介绍下，这个文件的开头是“mbdb”，前六个字节一般是固定的“mbdb\05\00”，然后就是一个个结构体。结构体大概是这样子的：
struct fileinfo{
char *domain;
char *filename;
char *linktarget;
char *datahash;
char *unknown1;
unsigned short mode;
unsigned int unknown2;
unsigned int inode;
unsigned int userid;
unsigned int groupid;
unsigned int mtime;
unsigned int atime;
unsigned int ctime;
unsigned long long filelen;
unsigned int flag;
unsigned int numprops;
};domain就是包名，每个应用都不同。filename就是path。datahash发现现在都是空的了，无用。最后就是那个numprops是附加数据，这个必须处理。flag为0是文件夹或者link，也可以通过filelen来判断是否为文件。
blackfeather 2016/7/25 ℃ 1评论
Tea算法被某公司应用的酣畅淋漓，最近用到了，在测试了多分代码后，推荐此代码。保留原作者信息。
cpypt.cpp
/**
* The QQ2003C protocol plugin
*
* for gaim
*
* Copyright © 2004 Puzzlebird
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
**************************************************
* Reorganized by Minmin <csdengxm@hotmail.com>, 2005-3-27
**************************************************
*/
#include "stdafx.h"
#include "crypt.h"
#include <string.h>
#ifdef _WIN32
#include <winsock.h>
#else
#include <arpa/inet.h>
#endif
#include <cstring>
Crypt::Crypt()
{
}
Crypt::~Crypt()
{
}
void Crypt::teaEncipher(unsigned int *const v, const unsigned int *const k,
unsigned int *const w)
{
register unsigned int
y = ntohl(v[0]),
z = ntohl(v[1]),
a = ntohl(k[0]),
b = ntohl(k[1]),
c = ntohl(k[2]),
d = ntohl(k[3]),
n = 0x10, /* do encrypt 16 (0x10) times */
sum = 0,
delta = 0x9E3779B9; /* 0x9E3779B9 - 0x100000000 = -0x61C88647 */
while (n-- > 0) {
sum += delta;
y += ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b);
z += ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
}
w[0] = htonl(y); w[1] = htonl(z);
}
void Crypt::teaDecipher(unsigned int *const v, const unsigned int *const k,
unsigned int *const w)
{
register unsigned int
y = ntohl(v[0]),
z = ntohl(v[1]),
a = ntohl(k[0]),
b = ntohl(k[1]),
c = ntohl(k[2]),
d = ntohl(k[3]),
n = 0x10,
sum = 0xE3779B90,
/* why this ? must be related with n value*/
delta = 0x9E3779B9;
void *p = &a;
/* sum = delta<<5, in general sum = delta * n */
while (n-- > 0) {
z -= ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
y -= ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b);
sum -= delta;
}
w[0] = htonl(y);
w[1] = htonl(z);
}
void Crypt::encrypt( unsigned char* instr, int32 instrlen, unsigned char* key,
unsigned char* outstr, int32* outstrlen_ptr)
{
unsigned char
plain[8], /* plain text buffer*/
plain_pre_8[8], /* plain text buffer, previous 8 bytes*/
* crypted, /* crypted text*/
* crypted_pre_8, /* crypted test, previous 8 bytes*/
* inp; /* current position in instr*/
int
pos_in_byte = 1, /* loop in the byte */
is_header=1, /* header is one byte*/
count=0, /* number of bytes being crypted*/
padding = 0; /* number of padding stuff*/
//void encrypt_every_8_byte (void);
/*** we encrypt every eight byte ***/
#define encrypt_every_8_byte() \
{\
for(pos_in_byte=0; pos_in_byte<8; pos_in_byte++) {\
if(is_header) { plain[pos_in_byte] ^= plain_pre_8[pos_in_byte]; }\
else { plain[pos_in_byte] ^= crypted_pre_8[pos_in_byte]; }\
} /* prepare plain text*/\
teaEncipher( (unsigned int *) plain,\
(unsigned int *) key, \
(unsigned int *) crypted); /* encrypt it*/\
\
for(pos_in_byte=0; pos_in_byte<8; pos_in_byte++) {\
crypted[pos_in_byte] ^= plain_pre_8[pos_in_byte]; \
} \
memcpy(plain_pre_8, plain, 8); /* prepare next*/\
\
crypted_pre_8 = crypted; /* store position of previous 8 byte*/\
crypted += 8; /* prepare next output*/\
count += 8; /* outstrlen increase by 8*/\
pos_in_byte = 0; /* back to start*/\
is_header = 0; /* and exit header*/\
}/* encrypt_every_8_byte*/
pos_in_byte = (instrlen + 0x0a) % 8; /* header padding decided by instrlen*/
if (pos_in_byte) {
pos_in_byte = 8 - pos_in_byte;
}
plain[0] = (rand() & 0xf8) | pos_in_byte;
memset(plain+1, rand()&0xff, pos_in_byte++);
memset(plain_pre_8, 0x00, sizeof(plain_pre_8));
crypted = crypted_pre_8 = outstr;
padding = 1; /* pad some stuff in header*/
while (padding <= 2) { /* at most two byte */
if(pos_in_byte < 8) { plain[pos_in_byte++] = rand() & 0xff; padding ++; }
if(pos_in_byte == 8){ encrypt_every_8_byte(); }
}
inp = instr;
while (instrlen > 0) {
if (pos_in_byte < 8) { plain[pos_in_byte++] = *(inp++); instrlen --; }
if (pos_in_byte == 8){ encrypt_every_8_byte(); }
}
padding = 1; /* pad some stuff in tailer*/
while (padding <= 7) { /* at most sever byte*/
if (pos_in_byte < 8) { plain[pos_in_byte++] = 0x00; padding ++; }
if (pos_in_byte == 8){ encrypt_every_8_byte(); }
}
*outstrlen_ptr = count;
}
int Crypt::rand(void)
{
/* it can be the real random seed function*/
return 0xdead; /* override with number, convenient for debug*/
}
int Crypt::decrypt( unsigned char* instr, int32 instrlen, unsigned char* key,
unsigned char* outstr, int32* outstrlen_ptr)
{
unsigned char
decrypted[8], m[8],
* crypt_buff,
* crypt_buff_pre_8,
* outp;
int
count,
context_start,
pos_in_byte,
padding;
#define decrypt_every_8_byte() {\
bool bNeedRet = false;\
for (pos_in_byte = 0; pos_in_byte < 8; pos_in_byte ++ ) {\
if (context_start + pos_in_byte >= instrlen) \
{\
bNeedRet = true;\
break;\
}\
decrypted[pos_in_byte] ^= crypt_buff[pos_in_byte];\
}\
if( !bNeedRet ) { \
teaDecipher( (unsigned int *) decrypted, \
(unsigned int *) key, \
(unsigned int *) decrypted);\
\
context_start += 8;\
crypt_buff += 8;\
pos_in_byte = 0;\
}\
}/* decrypt_every_8_byte*/
/* at least 16 bytes and %8 == 0*/
if ((instrlen % 8) || (instrlen < 16)) return 0;
/* get information from header*/
teaDecipher( (unsigned int *) instr,
(unsigned int *) key,
(unsigned int *) decrypted);
pos_in_byte = decrypted[0] & 0x7;
count = instrlen - pos_in_byte - 10; /* this is the plaintext length*/
/* return if outstr buffer is not large enought or error plaintext length*/
if (*outstrlen_ptr < count || count < 0) return 0;
memset(m, 0, 8);
crypt_buff_pre_8 = m;
*outstrlen_ptr = count; /* everything is ok! set return string length*/
crypt_buff = instr + 8; /* address of real data start */
context_start = 8; /* context is at the second 8 byte*/
pos_in_byte ++; /* start of paddng stuffv*/
padding = 1; /* at least one in header*/
while (padding <= 2) { /* there are 2 byte padding stuff in header*/
if (pos_in_byte < 8) { /* bypass the padding stuff, none sense data*/
pos_in_byte ++; padding ++;
}
if (pos_in_byte == 8) {
crypt_buff_pre_8 = instr;
//if (! decrypt_every_8_byte()) return 0;
decrypt_every_8_byte();
}
}/* while*/
outp = outstr;
while(count !=0) {
if (pos_in_byte < 8) {
*outp = crypt_buff_pre_8[pos_in_byte] ^ decrypted[pos_in_byte];
outp ++;
count --;
pos_in_byte ++;
}
if (pos_in_byte == 8) {
crypt_buff_pre_8 = crypt_buff - 8;
//if (! decrypt_every_8_byte()) return 0;
decrypt_every_8_byte();
}
}/* while*/
for (padding = 1; padding < 8; padding ++) {
if (pos_in_byte < 8) {
if (crypt_buff_pre_8[pos_in_byte] ^ decrypted[pos_in_byte]) return 0;
pos_in_byte ++;
}
if (pos_in_byte == 8 ) {
crypt_buff_pre_8 = crypt_buff;
//if (! decrypt_every_8_byte()) return 0;
decrypt_every_8_byte();
}
}/* for*/
return 1;
}
int Crypt::qq_crypt ( unsigned char flag, unsigned char* instr, int32 instrlen,
unsigned char* key, unsigned char* outstr, int32* outstrlen_ptr)
{
if (flag == DECRYPT)
return decrypt(instr, instrlen, key, outstr, outstrlen_ptr);
else
if (flag == ENCRYPT)
encrypt(instr, instrlen, key, outstr, outstrlen_ptr);
return 1; /* flag must be DECRYPT or ENCRYPT*/
}/* qq_crypt*/blackfeather 2016/4/18 ℃ 0评论
逆向分析某app的本地存储是发现其平台下所有APP都是利用了同一个基于sqlite的加密库，网上没有搜索到任何有用信息，猜测是自己定制的（文件名:libdatabase_sqlcrypto.so，内部名是alibaba.sqlcrypto）。
ps:如果有人觉得此文不妥，立即联系博主处理（我发现了一些事情,表示你们响应速度还蛮快的）。
blackfeather 2015/12/24 ℃ 5评论
无线网络越来越普及，从此涉及到的业务也出现了多个。从安全圈子来讲，破解、劫持、嗅探等等都开始玩的不亦乐乎。本篇文章详细说明有了数据包如何还原WPA/WPA2加密的密文数据。此文章仅代表博主对WPA/WPA2加密解密的理解，用于学习流程，也为共同研究的同学提供关键字查询更多资料，如有错误请多包涵。
关键字：WAP,WPA2,解密,EAPOL,WPADecrypt。
开放wifi就不提了，直接通过嗅探可以看到所有数据。
blackfeather 2015/9/29 ℃ 1评论
blackfeather 2015/2/13 ℃ 1评论