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Commit 0b2e8c24 authored by Him188moe's avatar Him188moe
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mirai-native/src/main/c/TeaEncryption.c deleted 100644 → 0
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#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>
#include <time.h>
//#define CRYPT_ONE_BYTE
typedef char int8 ;
typedef unsigned char uint8 ;
typedef short int16 ;
typedef unsigned short uint16 ;
typedef long int32 ;
typedef unsigned long uint32 ;
typedef struct tagTEACTX
{
uint8 buf[8] ;
uint8 bufPre[8] ;
const uint8 *pKey ; //指向16字节的key
uint8 *pCrypt ;
uint8 *pCryptPre ;
} TEACTX, *LPTEACTX ;
uint16 Host2NetShort(uint16 usHost)
{
const uint16 us = 0x1234 ;
return ((uint8 *)&us)[0] == 0x12 ? usHost : ((usHost>>8) | (usHost<<8)) ;
}
uint16 Net2HostShort(uint16 usNet)
{
return Host2NetShort(usNet) ;
}
uint32 Host2NetLong(uint32 ulHost)
{
const uint16 us = 0x1234 ;
return ((uint8 *)&us)[0] == 0x12 ? ulHost : (((ulHost>>8) & 0xFF00) |
((ulHost<<8) & 0xFF0000) | (ulHost<<24) | (ulHost>>24)) ;
}
uint32 Net2HostLong(uint32 ulHost)
{
return Host2NetLong(ulHost) ;
}
//TEA加密。v明文8字节。k密钥16字节。w密文输出8字节。
void EnCipher(const uint32 *const v, const uint32 *const k, uint32 *const w)
{
register uint32
y = Host2NetLong(v[0]),
z = Host2NetLong(v[1]),
a = Host2NetLong(k[0]),
b = Host2NetLong(k[1]),
c = Host2NetLong(k[2]),
d = Host2NetLong(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] = Net2HostLong(y);
w[1] = Net2HostLong(z);
}
//TEA解密。v密文8字节。k密钥16字节。w明文输出8字节。
void DeCipher(const uint32 *const v, const uint32 *const k, uint32 *const w)
{
register uint32
y = Host2NetLong(v[0]),
z = Host2NetLong(v[1]),
a = Host2NetLong(k[0]),
b = Host2NetLong(k[1]),
c = Host2NetLong(k[2]),
d = Host2NetLong(k[3]),
n = 0x10,
sum = 0xE3779B90,
/* why this ? must be related with n value*/
delta = 0x9E3779B9;
/* 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] = Net2HostLong(y);
w[1] = Net2HostLong(z);
}
uint32 Random(void)
{
return (uint32)rand();
//return 0xdead ;
}
//每次8字节加密
static void EncryptEach8Bytes(TEACTX *pCtx)
{
#ifdef CRYPT_ONE_BYTE
uint32 i ;
uint8 *pPlain8, *pPlainPre8, *pCrypt8, *pCryptPre8 ;
pPlain8 = (uint8 *)pCtx->buf ;
pPlainPre8 = (uint8 *)pCtx->bufPre ;
pCrypt8 = (uint8 *)pCtx->pCrypt ;
pCryptPre8 = (uint8 *)pCtx->pCryptPre ;
//本轮明文与上一轮的密文异或
for(i=0; i<8; i++)
pPlain8[i] ^= pCryptPre8[i] ;
//再对异或后的明文加密
EnCipher((uint32 *)pPlain8, (uint32 *)pCtx->pKey, (uint32 *)pCrypt8) ;
//将加密后的密文与上一轮的明文(其实是上一轮明文与上上轮密文异或结果)异或
for(i=0; i<8; i++)
pCrypt8[i] ^= pPlainPre8[i] ;
//
for(i=0; i<8; i++)
pPlainPre8[i] = pPlain8[i] ;
#else
uint32 *pPlain8, *pPlainPre8, *pCrypt8, *pCryptPre8 ;
pPlain8 = (uint32 *)pCtx->buf ;
pPlainPre8 = (uint32 *)pCtx->bufPre ;
pCrypt8 = (uint32 *)pCtx->pCrypt ;
pCryptPre8 = (uint32 *)pCtx->pCryptPre ;
pPlain8[0] ^= pCryptPre8[0] ;
pPlain8[1] ^= pCryptPre8[1] ;
EnCipher(pPlain8, (const uint32 *)pCtx->pKey, pCrypt8) ;
pCrypt8[0] ^= pPlainPre8[0] ;
pCrypt8[1] ^= pPlainPre8[1] ;
pPlainPre8[0] = pPlain8[0] ;
pPlainPre8[1] = pPlain8[1] ;
#endif
pCtx->pCryptPre = pCtx->pCrypt ;
pCtx->pCrypt += 8 ;
}
//加密。pPlain指向待加密的明文。ulPlainLen明文长度。pKey密钥16字节。
//pOut指向密文输出缓冲区。pOutLen输入输出参数，指示输出缓冲区长度、密文长度。
uint32 Encrypt(TEACTX *pCtx, const uint8 *pPlain, uint32 ulPlainLen,
const uint8 *pKey, uint8 *pOut, uint32 *pOutLen)
{
uint32 ulPos, ulPadding, ulOut ;
const uint8 *p ;
if(pPlain == NULL || ulPlainLen == 0 || pOutLen == NULL)
return 0 ;
//计算需要填充的字节数
//整个加密流程下来，不管明文长度多少，填充10个字节是固定的，
//然后再根据明文的长度计算还需要填充的字节数。
ulPos = (8 - ((ulPlainLen + 10) & 0x07)) & 0x07 ;
//计算加密后的长度
ulOut = 1 + ulPos + 2 + ulPlainLen + 7 ;
if(*pOutLen < ulOut)
{
*pOutLen = ulOut ;
return 0 ;
}
*pOutLen = ulOut ;
memset(pCtx, 0, sizeof(TEACTX)) ;
pCtx->pCrypt = pOut ;
pCtx->pCryptPre = pCtx->bufPre ;
pCtx->pKey = pKey ;
//buf[0]的最低3bit位等于所填充的长度
pCtx->buf[0] = (uint8)((Random() & 0xF8) | ulPos) ;
//用随机数填充上面计算得到的填充长度(每个字节填充的内容是一样的)。
//这里填充的起始位置是&buf[1]。
memset(pCtx->buf+1, (uint8)Random(), ulPos++) ;
//至少再填充两字节
for(ulPadding=0; ulPadding<2; ulPadding++)
{
if(ulPos == 8)
{
EncryptEach8Bytes(pCtx) ;
ulPos = 0 ;
}
pCtx->buf[ulPos++] = (uint8)Random() ;
}
p = pPlain ;
while(ulPlainLen > 0)
{
if(ulPos == 8)
{
EncryptEach8Bytes(pCtx) ;
ulPos = 0 ;
}
pCtx->buf[ulPos++] = *(p++) ;
ulPlainLen-- ;
}
//末尾再添加7字节0后加密，在解密过程的时候可以用来判断key是否正确。
for(ulPadding=0; ulPadding<7; ulPadding++)
pCtx->buf[ulPos++] = 0x00 ;
//
EncryptEach8Bytes(pCtx) ;
return ulOut ;
}
//每次8字节进行解密
static void DecryptEach8Bytes(TEACTX *pCtx)
{
#ifdef CRYPT_ONE_BYTE
uint32 i ;
uint8 bufTemp[8] ;
uint8 *pBuf8, *pBufPre8, *pCrypt8, *pCryptPre8 ;
pBuf8 = (uint8 *)pCtx->buf ;
pBufPre8 = (uint8 *)pCtx->bufPre ;
pCrypt8 = (uint8 *)pCtx->pCrypt ;
pCryptPre8 = (uint8 *)pCtx->pCryptPre ;
//当前的密文与前一轮明文(实际是前一轮明文与前前轮密文异或结果)异或
for(i=0; i<8; i++)
bufTemp[i] = pCrypt8[i] ^ pBufPre8[i] ;
//异或后的结果再解密(解密后得到当前名文与前一轮密文异或的结果，并非真正明文)
DeCipher((uint32 *)bufTemp, (uint32 *)pCtx->pKey, (uint32 *)pBufPre8) ;
//解密后的结果与前一轮的密文异或，得到真正的明文
for(i=0; i<8; i++)
pBuf8[i] = pBufPre8[i] ^ pCryptPre8[i] ;
#else
uint32 bufTemp[2] ;
uint32 *pBuf8, *pBufPre8, *pCrypt8, *pCryptPre8 ;
pBuf8 = (uint32 *)pCtx->buf ;
pBufPre8 = (uint32 *)pCtx->bufPre ;
pCrypt8 = (uint32 *)pCtx->pCrypt ;
pCryptPre8 = (uint32 *)pCtx->pCryptPre ;
bufTemp[0] = pCrypt8[0] ^ pBufPre8[0] ;
bufTemp[1] = pCrypt8[1] ^ pBufPre8[1] ;
DeCipher(bufTemp, (const uint32 *)pCtx->pKey, pBufPre8) ;
pBuf8[0] = pBufPre8[0] ^ pCryptPre8[0] ;
pBuf8[1] = pBufPre8[1] ^ pCryptPre8[1] ;
#endif
pCtx->pCryptPre = pCtx->pCrypt ;
pCtx->pCrypt += 8 ;
}
//解密。pCipher指向待解密密文。ulCipherLen密文长度。pKey密钥16字节。
//pOut指向明文输出缓冲区。pOutLen输入输出参数，指示输出缓冲区长度、明文长度。
uint32 Decrypt(TEACTX *pCtx, const uint8 *pCipher, uint32 ulCipherLen,
const uint8 *pKey, uint8 *pOut, uint32 *pOutLen)
{
uint32 ulPos, ulPadding, ulOut, ul ;
// 待解密的数据长度最少16字节，并且长度满足是8的整数倍。
if(pCipher == NULL || pOutLen == NULL ||
ulCipherLen < 16 || (ulCipherLen & 0x07) != 0)
return 0 ;
pCtx->pKey = pKey ; //***2016-06-15 这个忘记加了，补上***
// 先解密头8字节，以便获取第一轮加密时填充的长度。
DeCipher((const uint32 *)pCipher, (const uint32 *)pKey, (uint32 *)pCtx->bufPre) ;
for(ul=0; ul<8; ul++)
pCtx->buf[ul] = pCtx->bufPre[ul] ;
ulPos = pCtx->buf[0] & 0x07 ; //第一轮加密时填充的长度
if(ulPos > 1)
{
for(ulOut=2; ulOut<=ulPos; ulOut++)
{
if(pCtx->buf[1] != pCtx->buf[ulOut])
{
*pOutLen = 0 ;
return 0 ; //解密失败
}
}
}
ulOut = ulCipherLen - ulPos - 10 ;
if(ulPos + 10 > ulCipherLen || *pOutLen < ulOut)
return 0 ;
pCtx->pCryptPre = (uint8 *)pCipher ;
pCtx->pCrypt = (uint8 *)pCipher + 8 ;
ulPos++ ;
for(ulPadding=0; ulPadding<2; ulPadding++)
{
if(ulPos == 8)
{
DecryptEach8Bytes(pCtx) ;
ulPos = 0 ;
}
ulPos++ ;
}
//
for(ul=0; ul<ulOut; ul++)
{
if(ulPos == 8)
{
DecryptEach8Bytes(pCtx) ;
ulPos = 0 ;
}
pOut[ul] = pCtx->buf[ulPos] ;
ulPos++ ;
}
//
for(ulPadding=0; ulPadding<7; ulPadding++)
{
if(ulPos < 8)
{
if(pCtx->buf[ulPos] != 0x00)
{
*pOutLen = 0 ;
return 0 ;
}
}
ulPos++ ;
}
*pOutLen = ulOut ;
return 1 ;
}
void PrintBuffer(const uint8 *buf, uint32 ulLen)
{
uint32 i ;
for(i=0; i<ulLen; i++)
{
printf("%.2X ", buf[i]) ;
if((i+1) % 16 == 0)
putchar('\n') ;
}
if((ulLen & 0x0F) != 0)
putchar('\n') ;
}
int main(void)
{
const char *pPK[][2] =
{
//明文--密钥
{"tea", "123456789abcdef"},
{"tea", "123456789abcdef"},
{"123456", "password1234567"},
{"AABBCCD", "aabbccddeeffggh"},
{"Hello World 你好世界！", "aabbccddeeffggh"}
} ;
TEACTX ctx ;
uint8 bufEnc[512], bufDec[512] ;
uint32 ulEnc, ulDec, ulRet ;
int i ;
for(i=0; i<sizeof(pPK)/sizeof(pPK[0]); i++)
{
printf("明文：%s\n密钥：%s\n", pPK[i][0], pPK[i][1]) ;
ulEnc = sizeof(bufEnc) ;
Encrypt(&ctx, (const uint8 *)pPK[i][0], strlen(pPK[i][0])+1,
(const uint8 *)pPK[i][1], (uint8 *)bufEnc, &ulEnc) ;
printf("密文：\n") ;
PrintBuffer(bufEnc, ulEnc) ;
ulDec = sizeof(bufDec) ;
ulRet = Decrypt(&ctx, bufEnc, ulEnc, (const uint8 *)pPK[i][1],
(uint8 *)bufDec, &ulDec) ;
if(ulRet != 0)
printf("解密后明文：%s\n", bufDec) ;
else
printf("解密失败！\n") ;
putchar('\n') ;
}
return 0 ;
}
\ No newline at end of file
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