forked from kennwhite/fast_tim_conf
/
crypt.c
168 lines (128 loc) · 3.91 KB
/
crypt.c
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#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <openssl/sha.h>
#include <openssl/aes.h>
#include <openssl/evp.h>
int encrypt_str(unsigned char *buffer, const char *data, size_t dataLen, const char *key, size_t *outLen) {
EVP_CIPHER_CTX *ctx;
// TODO Bad
unsigned char iv[16] = {0};
int outlen1, outlen2;
ctx = EVP_CIPHER_CTX_new();
if (EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv) != 1)
return 0;
if (EVP_EncryptUpdate(ctx, buffer, &outlen1, data, dataLen) != 1)
return 0;
if (EVP_EncryptFinal_ex(ctx, buffer + outlen1, &outlen2) != 1)
return 0;
*outLen = outlen1 + outlen2;
return 1;
}
int decrypt_str(unsigned char *buffer, const char *data, size_t dataLen, const char *key, size_t *outLen) {
EVP_CIPHER_CTX *ctx;
// TODO Bad
unsigned char iv[16] = {0};
int outlen1, outlen2;
if (!(ctx = EVP_CIPHER_CTX_new()))
return 0;
if (EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv) != 1)
return 2;
if (EVP_DecryptUpdate(ctx, buffer, &outlen1, data, dataLen) != 1)
return 3;
if (EVP_DecryptFinal_ex(ctx, buffer + outlen1, &outlen2) != 1)
return 4;
*outLen = outlen1 + outlen2;
return 1;
}
int hash_str(unsigned char *output, const char *input, int length) {
SHA256_CTX sha256;
if (SHA256_Init(&sha256) != 1)
return 0;
if (SHA256_Update(&sha256, input, length) != 1)
return 0;
if (SHA256_Final(output, &sha256) != 1)
return 0;
return 1;
}
void convert_from_hex(const char *hexStr, char *result, size_t resultSize) {
unsigned char *dst = result;
unsigned char *end = result + resultSize;
unsigned int u;
while (dst < end && sscanf(hexStr, "%2x", &u) == 1) {
*dst++ = u;
hexStr += 2;
}
}
void convert_to_hex(char *str, size_t strLen, char *hexStr) {
unsigned char *start = str;
unsigned char *end = str + strLen;
while(start < end) {
sprintf(hexStr, "%02x", *start);
start += 1;
hexStr += 2;
}
}
static int l_hash(lua_State *L) {
size_t len;
const char *str = luaL_checklstring(L, 1, &len);
unsigned char encr[SHA256_DIGEST_LENGTH];
if (hash_str(encr, str, len) != 1)
return luaL_error(L, "Error hashing value");
size_t hexOutLen = SHA256_DIGEST_LENGTH * 2;
char hexStr[hexOutLen];
convert_to_hex(encr, SHA256_DIGEST_LENGTH, hexStr);
luaL_Buffer b;
luaL_buffinit(L, &b);
luaL_addlstring(&b, hexStr, hexOutLen);
luaL_pushresult(&b);
return 1;
}
static int l_encrypt(lua_State *L) {
size_t keyLen, valLen, outLen, bufferSize;
// TODO Key must be the correct key size
const char *key = luaL_checklstring(L, 1, &keyLen);
const char *val = luaL_checklstring(L, 2, &valLen);
bufferSize = valLen + AES_BLOCK_SIZE;
unsigned char buffer[bufferSize];
if (encrypt_str(buffer, val, valLen, key, &outLen) != 1)
return luaL_error(L, "Error encrypting value");
size_t hexOutLen = outLen * 2;
char hexStr[hexOutLen];
convert_to_hex(buffer, outLen, hexStr);
luaL_Buffer b;
luaL_buffinit(L, &b);
luaL_addlstring(&b, hexStr, hexOutLen);
luaL_pushresult(&b);
return 1;
}
static int l_decrypt(lua_State *L) {
size_t keyLen, dataLen, outLen, hexDataLen;
const char *key = luaL_checklstring(L, 1, &keyLen);
const char *hexData = luaL_checklstring(L, 2, &hexDataLen);
dataLen = hexDataLen/2;
char data[dataLen];
convert_from_hex(hexData, data, dataLen);
char decryptBuffer[dataLen];
int res = decrypt_str(decryptBuffer, data, dataLen, key, &outLen);
if (res != 1)
return luaL_error(L, "Error decrypting value %d, data:%s, dataLen: %d", res, data, dataLen);
luaL_Buffer b;
luaL_buffinit(L, &b);
luaL_addlstring(&b, decryptBuffer, outLen);
luaL_pushresult(&b);
return 1;
}
static const struct luaL_reg crypt[] = {
{"encrypt", l_encrypt},
{"decrypt", l_decrypt},
{"hash", l_hash},
{NULL, NULL} /* sentinel */
};
int luaopen_crypt (lua_State *L) {
luaL_openlib(L, "crypt", crypt, 0);
return 1;
}
int main() {
return 0;
}