C/C++ MD5 hash function

[InFlames]

Easier than including the actual MD5 source in your projects.




char* md5(char *data, char *hash) {
HCRYPTPROV c_prov;
HCRYPTHASH c_hash;
BYTE raw_hash[64];
DWORD len = sizeof(raw_hash);
unsigned int i;

if(CryptAcquireContext(&c_prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT) &&
CryptCreateHash(c_prov, CALG_MD5, 0, 0, &c_hash) &&
CryptHashData(c_hash, data, strlen(data), 0) &&
CryptGetHashParam(c_hash, HP_HASHVAL, raw_hash, &len, 0) &&
((len * 2) + 1 <= 33)) {
for(i=0;i<len;i++) {
wsprintf(&hash[i * 2], TEXT("%02.2x"), raw_hash[i]);
}
} else {
return NULL;
}

hash[33] = '\0';
return hash;
}

int main(void)
{
char hash[33];

printf("%s\r\n", md5("string", hash));

return 0;
}