3des使用

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unsigned char *src = NULL;

int data_rest = nSrcSize % 8;
int len = nSrcSize + (8 - data_rest);
unsigned char ch = 8 - data_rest;

src = new unsigned char[len];
if (NULL == src )
{
return false;
}

memset(src, 0, len);
memcpy(src, pSrc, nSrcSize);
memset(src + nSrcSize, ch, 8 - data_rest);

unsigned char block_key[8];
DES_key_schedule ks, ks2, ks3;

memset(block_key, 0, sizeof(block_key));
memcpy(block_key, key + 0, 8);
DES_set_key_unchecked((const_DES_cblock*)block_key, &ks);
memcpy(block_key, key + 8, 8);
DES_set_key_unchecked((const_DES_cblock*)block_key, &ks2);
memcpy(block_key, key + 16, 8);
DES_set_key_unchecked((const_DES_cblock*)block_key, &ks3);

DES_cblock m_ivec;
m_ivec[0] = 0x1;
m_ivec[1] = 0x2;
m_ivec[2] = 0x3;
m_ivec[3] = 0x4;
m_ivec[4] = 0x5;
m_ivec[5] = 0x6;
m_ivec[6] = 0x7;
m_ivec[7] = 0x8;

DES_ede3_cbc_encrypt(src, pDes, len,
&ks, &ks2, &ks3,
&m_ivec, DES_ENCRYPT);