String StringUtil::MD5(const String& input, bool raw /* = false */) {
Md5Digest md5(input.data(), input.size());
auto const rawLen = sizeof(md5.digest);
if (raw) return String((char*)md5.digest, rawLen, CopyString);
auto const hexLen = rawLen * 2;
String hex(hexLen, ReserveString);
string_bin2hex((char*)md5.digest, rawLen, hex.bufferSlice().ptr);
return hex.setSize(hexLen);
}
String StringUtil::MD5(const char *data, uint32_t size,
bool raw /* = false */) {
Md5Digest md5(data, size);
auto const rawLen = sizeof(md5.digest);
if (raw) return String((char*)md5.digest, rawLen, CopyString);
auto const hexLen = rawLen * 2;
String hex(hexLen, ReserveString);
string_bin2hex((char*)md5.digest, rawLen, hex.mutableData());
hex.setSize(hexLen);
return hex;
}
/** メッセージを暗号化する
* @param[in] peer_addr 送信先IPアドレス
* @param[in] message 暗号化するメッセージ
* @param[out] ret_str 暗号化したメッセージを指すポインタ変数のアドレス
* @param[out] len 暗号化メッセージ長返却領域
* @retval 0 正常終了
* @retval -EINVAL 引数異常
*/
int
ipmsg_encrypt_message(const char *peer_addr, const char *message,
unsigned char **ret_str, size_t *len) {
int rc = 0;
int retry = 0;
unsigned long peer_cap = 0;
unsigned long skey_type = 0, akey_type = 0;
char *session_key = NULL;
char *enc_skey = NULL;
size_t skey_len = 0;
char *key_e = NULL, *key_n = NULL;
char *raw_enc_body = NULL;
unsigned char *enc_body = NULL;
size_t enc_len = 0;
unsigned char *encrypted_message = NULL;
size_t total_len = 0;
unsigned char *sign = NULL;
unsigned long sign_type = 0;
int i = 0;
if ( (peer_addr == NULL) || (message == NULL) ||
(ret_str == NULL) || (len == NULL) ) {
rc = -EINVAL;
goto error_out;
}
/* 相手の暗号化能力を取得 */
retry = PUBKEY_MAX_RETRY;
do{
rc = userdb_wait_public_key(peer_addr, &peer_cap, &key_e, &key_n);
if ( (rc < 0) && (rc != -EINTR) ) {
goto error_out; /* 明示的なエラー */
}
if (rc == 0) { /* 見付けた */
dbg_out("Found: \n\taddr = %s\n"
"\tcap = %x\n"
"\tpubkey-e = %s\n"
"\tpubkey-n = %s\n",
peer_addr,
peer_cap,
key_e,
key_n);
break;
}
--retry;
} while(retry > 0);
if ( (rc != 0) && (retry == 0) )
goto free_peer_key_out; /* 取得失敗 */
/*
*暗号化アルゴリズムを選択
*/
rc = select_symmetric_key(peer_cap, &skey_type,
hostinfo_refer_ipmsg_crypt_policy_is_speed());
if (rc != 0)
goto free_peer_key_out;
/*
* セッションキー作成と本文の暗号化
*/
rc = symcrypt_encrypt_message(skey_type, message, &session_key,
&skey_len, &raw_enc_body, &enc_len);
if (rc != 0)
goto free_peer_key_out;
rc = string_bin2hex((const u_int8_t *)raw_enc_body, enc_len, &enc_body);
if (rc != 0)
goto free_session_key_out;
/*
* セッションキーを暗号化
*/
rc = pcrypt_encrypt_message(peer_cap, key_e, key_n, session_key,
skey_len, &enc_skey, &akey_type);
if (rc != 0)
goto free_enc_body_out;
/*
* 暗号化文字列長取得
* longの長さは, 64ビット環境の場合は, 8バイトになるので,
* 1バイトあたりの表示領域長(2)をlongのバイト長文だけ掛け合わせることで,
* 領域長に対するアーキ依存性を排除する.
* +3はデリミタ(':')2つとヌルターミネートの分
*/
total_len = sizeof(unsigned long) * 2 + strlen(enc_skey) + strlen(enc_body) + 3;
encrypted_message = g_malloc(total_len);
if (encrypted_message == NULL) {
rc = -ENOMEM;
goto free_encoded_session_key;
}
/*
*署名を選択する
*/
rc = select_signature(peer_cap, &sign_type,
hostinfo_refer_ipmsg_crypt_policy_is_speed());
if (rc != 0) {
sign_type = 0; /* 署名を使用しない */
}
snprintf(encrypted_message, total_len, "%x:%s:%s",
(skey_type|akey_type|sign_type), enc_skey, enc_body);
dbg_out("Encrypted body:%s\n", encrypted_message);
if (sign_type != 0) {
/*
* 小文字に変換
*/
for(i = 0; i < total_len; ++i) {
encrypted_message[i] = tolower((int)encrypted_message[i]);
}
rc = pcrypt_sign(akey_type, sign_type, encrypted_message, &sign);
if (rc != 0)
goto free_sign_out;
g_free(encrypted_message);
/*
* 署名を付して本文を再作成
*/
total_len += (strlen(sign) + 1); /* +1は, デリミタ分 */
encrypted_message = g_malloc(total_len);
if (encrypted_message == NULL)
goto free_sign_out;
snprintf(encrypted_message, total_len, "%x:%s:%s:%s",
(skey_type|akey_type|sign_type),
enc_skey,
enc_body,
sign);
dbg_out("Signed body:%s\n", encrypted_message);
}
/*
* 小文字に変換
*/
total_len = strlen(encrypted_message);
for(i = 0; i < total_len; ++i) {
encrypted_message[i] = tolower((int)encrypted_message[i]);
}
/*
* 解析結果返却
*/
*ret_str = encrypted_message;
*len = total_len;
rc = 0;
free_sign_out:
if (sign != NULL)
g_free(sign);
free_enc_body_out:
if (enc_body != NULL)
g_free(enc_body);
free_encoded_session_key:
if (enc_skey != NULL)
g_free(enc_skey);
free_session_key_out:
if (session_key != NULL)
g_free(session_key);
if (raw_enc_body != NULL)
g_free(raw_enc_body);
free_peer_key_out:
if (key_e != NULL)
g_free(key_e);
if (key_n != NULL)
g_free(key_n);
error_out:
return rc;
}
String StringUtil::HexEncode(CStrRef input) {
if (input.empty()) return input;
int len = input.size();
char *ret = string_bin2hex(input.data(), len);
return String(ret, len, AttachString);
}
